add

.github/workflows/hf_sync.yml

@@ -0,0 +1,35 @@
+name: Sync to Hugging Face Space
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout GitHub Repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # Fetch the entire history to avoid shallow clone issues
+
+      - name: Install Git LFS
+        run: |
+          curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash
+          sudo apt-get install git-lfs
+          git lfs install
+
+      - name: Configure Git
+        run: |
+          git config --global user.name "GitHub Actions Bot"
+          git config --global user.email "actions@github.com"
+
+      - name: Push to Hugging Face
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          git remote add huggingface https://user:${HF_TOKEN}@huggingface.co/spaces/SWE-Arena/SWE-Agent-Arena
+          git fetch huggingface
+          git push huggingface main --force

.gitignore

@@ -0,0 +1,16 @@
+# Environment variables
+.env
+
+# Python
+*.venv
+*.ipynb
+*.pyc
+__pycache__/
+
+# Editor
+.claude
+.vscode
+.omc
+
+# Node.js
+node_modules/

Dockerfile

@@ -0,0 +1,19 @@
+FROM node:20-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install agent CLIs globally in a single layer
+RUN npm install -g \
+    @anthropic-ai/claude-code \
+    @google/gemini-cli \
+    @openai/codex \
+    grok-cli
+
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY . .
+
+EXPOSE 7860
+CMD ["node", "app.js"]

README.md

@@ -0,0 +1,102 @@
+---
+title: SWE-Agent-Arena
+emoji: ⚔️
+colorFrom: green
+colorTo: purple
+sdk: static
+pinned: false
+hf_oauth: true
+short_description: Agent arena for software engineering tasks
+---
+
+# SWE-Agent-Arena: An Interactive Platform for Evaluating CLI Coding Agents in Software Engineering
+
+Welcome to **SWE-Agent-Arena**, an open-source platform designed for evaluating CLI coding agents on real software engineering (SE) tasks. SWE-Agent-Arena benchmarks agents through blind pairwise comparisons — two random agents work on the same task, each in its own isolated environment, and users compare agent output and git diffs to vote on performance.
+
+## Key Features
+
+- **Blind Pairwise Comparison**: Two anonymous agents tackle the same task — vote without knowing which agent is which.
+- **Multi-Round Conversational Workflows**: Send follow-up messages to each agent independently across multiple rounds, mirroring real-world iterative SE workflows.
+- **Live Streaming Output**: Watch agent stdout stream in real-time as agents work on your task.
+- **Side-by-Side Git Diffs**: Compare exactly what each agent changed with side-by-side diff views.
+- **RepoChat Integration**: Automatically inject repository context (issues, PRs, commits, file contents, and more) from GitHub, GitLab, or HuggingFace URLs into agent workspaces for more realistic evaluations.
+- **Advanced Evaluation Metrics**: Assess agents using a comprehensive suite of metrics including:
+  - **Traditional ranking metrics**: Elo ratings and win rates to measure overall agent performance
+  - **Efficiency metrics**: Conversation Efficiency Index (CEI) — fewer rounds to win = higher score
+  - **Consistency metrics**: Model Consistency Score (MCS) — draw rate in self-matches to quantify agent determinism and reliability
+  - **Probabilistic metrics**: Bradley-Terry iterative MLE coefficients for pairwise comparison modeling
+  - **Network-based metrics**: PageRank, eigenvector centrality to identify influential agents in head-to-head comparisons
+  - **Community detection metrics**: Newman modularity to reveal clusters of agents with similar capabilities
+- **Transparent, Open-Source Leaderboard**: View real-time agent rankings across diverse SE workflows with full transparency.
+- **Intelligent Request Filtering**: Employ `gpt-oss-safeguard-20b` as a guardrail to automatically filter out non-software-engineering-related requests, ensuring focused and relevant evaluations.
+
+## Why SWE-Agent-Arena?
+
+Existing evaluation frameworks often don't address the complex, iterative nature of SE tasks performed by CLI coding agents. SWE-Agent-Arena fills critical gaps by:
+
+- Supporting context-rich, multi-turn evaluations to capture iterative agent workflows
+- Integrating repository-level context to simulate real-world development scenarios
+- Providing multidimensional metrics for nuanced agent comparisons
+- Comparing end-to-end CLI agents — not just language models — on actual code changes
+
+## How It Works
+
+1. **Submit a Task**: Sign in and input your SE-related task (optional: include a GitHub/GitLab/HuggingFace URL for repository context)
+2. **Watch Agents Work**: Two anonymous agents work on the task in parallel, each in an isolated temp directory — watch live output as they run
+3. **Compare Diffs**: Side-by-side git diffs show what each agent changed
+4. **Continue the Conversation**: Send follow-up messages to each agent independently to test contextual understanding over multiple rounds
+5. **Vote**: Choose the better agent — Agent A, Agent B, Tie, or Tie (Both Bad)
+
+## Getting Started
+
+### Prerequisites
+
+- A [Hugging Face](https://huggingface.co) account
+
+### Usage
+
+1. Navigate to the [SWE-Agent-Arena platform](https://huggingface.co/spaces/SE-Arena/SWE-Agent-Arena)
+2. Sign in with your Hugging Face account
+3. Enter your SE task prompt (optionally include a repository URL for context)
+4. Watch agents work, compare diffs, engage in multi-round interactions, and vote on agent performance
+
+## Contributing
+
+We welcome contributions from the community! Here's how you can help:
+
+1. **Submit SE Tasks**: Share your real-world SE problems to enrich our evaluation dataset
+2. **Report Issues**: Found a bug or have a feature request? Open an issue in this repository
+3. **Enhance the Codebase**: Fork the repository, make your changes, and submit a pull request
+
+## Terms of Service
+
+- The service is a **research preview**. It only provides limited safety measures and may generate offensive content.
+- It must not be used for any **illegal, harmful, violent, racist, or sexual** purposes.
+- Please do not upload any **private** information.
+- The service collects user dialogue data and reserves the right to distribute it under a **Creative Commons Attribution (CC-BY)** or similar license.
+
+## Future Plans
+
+- **Analysis of Real-World SE Workloads**: Identify common patterns and challenges in user-submitted tasks
+- **Multi-Round Evaluation Metrics**: Develop specialized metrics for assessing agent adaptation over successive turns
+- **Expanded Agent Coverage**: Include additional CLI coding agents as they become available
+- **Advanced Context Integration**: Support richer repository context injection for more realistic evaluation scenarios
+
+## Contact
+
+For inquiries or feedback, please [open an issue](https://github.com/Software-Engineering-Arena/SWE-Agent-Arena/issues/new) in this repository. We welcome your contributions and suggestions!
+
+## Citation
+
+Made with ❤️ for SWE-Agent-Arena. If this work is useful to you, please consider citing our vision paper:
+
+```bibtex
+@inproceedings{zhao2025se,
+  title={SE Arena: An Interactive Platform for Evaluating Foundation Models in Software Engineering},
+  author={Zhao, Zhimin},
+  booktitle={2025 IEEE/ACM Second International Conference on AI Foundation Models and Software Engineering (Forge)},
+  pages={78--81},
+  year={2025},
+  organization={IEEE}
+}
+```

README_ref.md

@@ -0,0 +1,96 @@
+---
+title: SWE-Chatbot-Arena
+emoji: 🎯
+colorFrom: green
+colorTo: blue
+sdk: gradio
+sdk_version: 5.50.0
+app_file: app.py
+hf_oauth: true
+pinned: false
+short_description: Chatbot arena for software engineering tasks
+---
+
+# SWE-Chatbot-Arena: An Interactive Platform for Evaluating Foundation Models in Software Engineering
+
+Welcome to **SWE-Chatbot-Arena**, an open-source platform designed for evaluating software engineering-focused foundation models (FMs), particularly large language models (LLMs). SWE-Chatbot-Arena benchmarks models in iterative, context-rich workflows that are characteristic of software engineering (SE) tasks.
+
+## Key Features
+
+- **Multi-Round Conversational Workflows**: Evaluate models through extended, context-dependent interactions that mirror real-world SE processes.
+- **RepoChat Integration**: Automatically inject repository context (issues, commits, PRs) into conversations for more realistic evaluations.
+- **Advanced Evaluation Metrics**: Assess models using a comprehensive suite of metrics including:
+  - **Traditional ranking metrics**: Elo ratings and win rates to measure overall model performance
+  - **Network-based metrics**: Eigenvector centrality and PageRank to identify influential models in head-to-head comparisons
+  - **Community detection metrics**: Newman modularity to reveal clusters of models with similar capabilities
+  - **Consistency metrics**: Self-play match analysis to quantify model determinism and reliability
+  - **Efficiency metrics**: Conversation efficiency index to measure response quality relative to length
+- **Transparent, Open-Source Leaderboard**: View real-time model rankings across diverse SE workflows with full transparency.
+- **Intelligent Request Filtering**: Employ `gpt-oss-safeguard-20b` as a guardrail to automatically filter out non-software-engineering-related requests, ensuring focused and relevant evaluations.
+
+## Why SWE-Chatbot-Arena?
+
+Existing evaluation frameworks (e.g. [LMArena](https://lmarena.ai)) often don't address the complex, iterative nature of SE tasks. SWE-Chatbot-Arena fills critical gaps by:
+
+- Supporting context-rich, multi-turn evaluations to capture iterative workflows
+- Integrating repository-level context through RepoChat to simulate real-world development scenarios
+- Providing multidimensional metrics for nuanced model comparisons
+- Focusing on the full breadth of SE tasks beyond just code generation
+
+## How It Works
+
+1. **Submit a Prompt**: Sign in and input your SE-related task (optional: include a repository URL for RepoChat context)
+2. **Compare Responses**: Two anonymous models provide responses to your query
+3. **Continue the Conversation**: Test contextual understanding over multiple rounds
+4. **Vote**: Choose the better model at any point, with ability to re-assess after multiple turns
+
+## Getting Started
+
+### Prerequisites
+
+- A [Hugging Face](https://huggingface.co) account
+
+### Usage
+
+1. Navigate to the [SWE-Chatbot-Arena platform](https://huggingface.co/spaces/SE-Arena/SWE-Chatbot-Arena)
+2. Sign in with your Hugging Face account
+3. Enter your SE task prompt (optionally include a repository URL for RepoChat)
+4. Engage in multi-round interactions and vote on model performance
+
+## Contributing
+
+We welcome contributions from the community! Here's how you can help:
+
+1. **Submit SE Tasks**: Share your real-world SE problems to enrich our evaluation dataset
+2. **Report Issues**: Found a bug or have a feature request? Open an issue in this repository
+3. **Enhance the Codebase**: Fork the repository, make your changes, and submit a pull request
+
+## Privacy Policy
+
+Your interactions are anonymized and used solely for improving SWE-Chatbot-Arena and FM benchmarking. By using SWE-Chatbot-Arena, you agree to our Terms of Service.
+
+## Future Plans
+
+- **Analysis of Real-World SE Workloads**: Identify common patterns and challenges in user-submitted tasks
+- **Multi-Round Evaluation Metrics**: Develop specialized metrics for assessing model adaptation over successive turns
+- **Expanded FM Coverage**: Include multimodal and domain-specific foundation models
+- **Advanced Context Compression**: Integrate techniques like [LongRope](https://github.com/microsoft/LongRoPE) and [SelfExtend](https://github.com/datamllab/LongLM) to manage long-term memory in multi-round conversations
+
+## Contact
+
+For inquiries or feedback, please [open an issue](https://github.com/SE-Arena/SWE-Chatbot-Arena/issues/new) in this repository. We welcome your contributions and suggestions!
+
+## Citation
+
+Made with ❤️ for SWE-Chatbot-Arena. If this work is useful to you, please consider citing our vision paper:
+
+```bibtex
+@inproceedings{zhao2025se,
+  title={SE Arena: An Interactive Platform for Evaluating Foundation Models in Software Engineering},
+  author={Zhao, Zhimin},
+  booktitle={2025 IEEE/ACM Second International Conference on AI Foundation Models and Software Engineering (Forge)},
+  pages={78--81},
+  year={2025},
+  organization={IEEE}
+}
+```

app.js

@@ -0,0 +1,2026 @@
+// References for model evaluation metrics:
+// - Chatbot Arena: https://colab.research.google.com/drive/1KdwokPjirkTmpO_P1WByFNFiqxWQquwH
+// - Evalica: https://github.com/dustalov/evalica/blob/master/Chatbot-Arena.ipynb
+
+import "dotenv/config";
+import { mkdtempSync, rmSync } from "node:fs";
+import { spawn, execFile, execFileSync } from "node:child_process";
+import { promisify } from "node:util";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { randomUUID } from "node:crypto";
+import { URL } from "node:url";
+
+import express from "express";
+import cookieSession from "cookie-session";
+import OpenAI from "openai";
+import { Octokit } from "@octokit/rest";
+import { Gitlab } from "@gitbeaker/rest";
+import { uploadFile, listFiles, downloadFile } from "@huggingface/hub";
+import whichSync from "which";
+
+const execFileAsync = promisify(execFile);
+
+// ---------------------------------------------------------------------------
+// Environment & constants
+// ---------------------------------------------------------------------------
+
+const openaiClient = new OpenAI({
+  apiKey: process.env.OPENROUTER_API_KEY,
+  baseURL: "https://openrouter.ai/api/v1",
+});
+
+const CLI_DATA_REPO = "SWE-Arena/cli_data";
+const LEADERBOARD_REPO = "SWE-Arena/leaderboard_data";
+const VOTE_REPO = "SWE-Arena/vote_data";
+const CONVERSATION_REPO = "SWE-Arena/conversation_data";
+const LEADERBOARD_FILE = "agent_arena";
+
+const AGENT_TIMEOUT = 300_000; // 5 minutes per agent (ms)
+const AGENT_TIMEOUT_LABEL = `${AGENT_TIMEOUT / 60_000}min`;
+const LEADERBOARD_UPDATE_TIME_FRAME_DAYS = 365;
+
+let leaderboardCache = null; // in-memory cache, populated at startup
+
+const SHOW_HINT_STRING = true;
+const HINT_STRING = "Once signed in, your votes will be recorded securely.";
+
+const SYSTEM_PREFIX =
+  "You MUST operate entirely within the current working directory. " +
+  "Do NOT read, write, or execute anything outside this directory.";
+
+// ---------------------------------------------------------------------------
+// Agent definitions — loaded from HF dataset SWE-Arena/cli_data at startup.
+// Each {id}.json declares CLI binary and two "styles" that drive generic
+// buildAgentCommand() / runFollowup().
+//
+// promptStyle:
+//   "flag"  → [bin, "-p", <prompt>, ...initArgs]
+//   "exec"  → [bin, "exec", ...initArgs, <prompt>]
+//
+// followupStyle:
+//   "continue" → [bin, "-p", <followup>, ...followupArgs]   (e.g. --continue)
+//   "resume"   → [bin, "exec", ...followupArgs, "resume", "--last", <followup>]
+//   "replay"   → rebuild full conversation, then use promptStyle
+// ---------------------------------------------------------------------------
+
+let agents = [];
+let agentById = {};
+let agentByName = {};
+
+async function loadAgentsFromHf() {
+  const token = process.env.HF_TOKEN;
+  const credentials = token ? { accessToken: token } : undefined;
+  const repo = { type: "dataset", name: CLI_DATA_REPO };
+  const loaded = [];
+
+  for await (const file of listFiles({ repo, credentials })) {
+    if (!file.path.endsWith(".json")) continue;
+    // Skip hidden / nested paths (e.g. .gitattributes)
+    if (file.path.includes("/")) continue;
+
+    const resp = await downloadFile({ repo, path: file.path, credentials });
+    if (!resp) continue;
+
+    const data = JSON.parse(await resp.text());
+    const name = file.path.replace(/\.json$/, "");
+    loaded.push({ id: data.bin, name, ...data });
+  }
+
+  agents = loaded;
+  agentById = Object.fromEntries(agents.map((a) => [a.id, a]));
+  agentByName = Object.fromEntries(agents.map((a) => [a.name, a]));
+  console.log(`Loaded ${agents.length} agent(s) from ${CLI_DATA_REPO}: ${agents.map((a) => a.name).join(", ")}`);
+}
+
+// ---------------------------------------------------------------------------
+// CLI availability
+// ---------------------------------------------------------------------------
+
+function availableAgents() {
+  return agents.filter((a) => {
+    try {
+      whichSync.sync(a.bin);
+      return true;
+    } catch {
+      return false;
+    }
+  });
+}
+
+// ---------------------------------------------------------------------------
+// URL parsing helpers
+// ---------------------------------------------------------------------------
+
+function parseUrlPath(url) {
+  try {
+    const parsed = new URL(url);
+    const segments = parsed.pathname.split("/").filter(Boolean);
+    return { hostname: parsed.hostname || "", segments };
+  } catch {
+    return { hostname: null, segments: [] };
+  }
+}
+
+// ---------------------------------------------------------------------------
+// GitHub
+// ---------------------------------------------------------------------------
+
+const octokit = process.env.GITHUB_TOKEN
+  ? new Octokit({ auth: process.env.GITHUB_TOKEN })
+  : new Octokit();
+
+function classifyGithubUrl(segments) {
+  if (segments.length < 2) return null;
+  let repo = segments[1];
+  if (repo.endsWith(".git")) repo = repo.slice(0, -4);
+  const base = { owner: segments[0], repo };
+
+  if (segments.length === 2) return { ...base, resource: null };
+
+  const res = segments[2];
+
+  if (res === "issues" && segments.length >= 4)
+    return { ...base, resource: "issues", id: segments[3] };
+  if (res === "pull" && segments.length >= 4)
+    return { ...base, resource: "pull", id: segments[3] };
+  if (res === "commit" && segments.length >= 4)
+    return { ...base, resource: "commit", sha: segments[3] };
+  if (res === "blob" && segments.length >= 4)
+    return {
+      ...base,
+      resource: "blob",
+      branch: segments[3],
+      path: segments.slice(4).join("/"),
+    };
+  if (res === "tree" && segments.length >= 4)
+    return {
+      ...base,
+      resource: "tree",
+      branch: segments[3],
+      path: segments.slice(4).join("/"),
+    };
+  if (res === "discussions" && segments.length >= 4)
+    return { ...base, resource: "discussions", id: segments[3] };
+  if (res === "releases" && segments.length >= 5 && segments[3] === "tag")
+    return { ...base, resource: "releases", tag: segments[4] };
+  if (res === "compare" && segments.length >= 4)
+    return { ...base, resource: "compare", spec: segments[3] };
+  if (res === "actions" && segments.length >= 5 && segments[3] === "runs")
+    return { ...base, resource: "actions", run_id: segments[4] };
+  if (res === "wiki")
+    return {
+      ...base,
+      resource: "wiki",
+      page: segments.length >= 4 ? segments[3] : null,
+    };
+
+  return { ...base, resource: "unknown" };
+}
+
+async function fmtGithubRepo(owner, repo) {
+  const { data } = await octokit.repos.get({ owner, repo });
+  const parts = [`Repository: ${data.full_name}`];
+  if (data.description) parts.push(`Description: ${data.description}`);
+  try {
+    const readme = await octokit.repos.getReadme({ owner, repo });
+    const content = Buffer.from(readme.data.content, "base64").toString(
+      "utf-8"
+    );
+    parts.push(`README (first 2000 chars):\n${content.slice(0, 2000)}`);
+  } catch {}
+  return parts.join("\n\n");
+}
+
+async function fmtGithubIssue(owner, repo, issueId) {
+  const { data: issue } = await octokit.issues.get({
+    owner,
+    repo,
+    issue_number: Number(issueId),
+  });
+  const parts = [
+    `Issue #${issue.number}: ${issue.title}`,
+    `State: ${issue.state}`,
+    `Body:\n${issue.body || "(empty)"}`,
+  ];
+  const { data: comments } = await octokit.issues.listComments({
+    owner,
+    repo,
+    issue_number: Number(issueId),
+    per_page: 10,
+  });
+  if (comments.length) {
+    const texts = comments.map(
+      (c) => `  Comment by ${c.user.login}:\n  ${c.body}`
+    );
+    parts.push("Comments (first 10):\n" + texts.join("\n---\n"));
+  }
+  return parts.join("\n\n");
+}
+
+async function fmtGithubPr(owner, repo, prId) {
+  const { data: pr } = await octokit.pulls.get({
+    owner,
+    repo,
+    pull_number: Number(prId),
+  });
+  const parts = [
+    `Pull Request #${pr.number}: ${pr.title}`,
+    `State: ${pr.state}  Merged: ${pr.merged}`,
+    `Body:\n${pr.body || "(empty)"}`,
+  ];
+  const { data: files } = await octokit.pulls.listFiles({
+    owner,
+    repo,
+    pull_number: Number(prId),
+  });
+  const diffParts = files.map((f) => {
+    const header = `--- ${f.filename} (${f.status}, +${f.additions}/-${f.deletions})`;
+    const patch = f.patch || "(binary or too large)";
+    return `${header}\n${patch}`;
+  });
+  if (diffParts.length) {
+    let diffText = diffParts.join("\n\n");
+    if (diffText.length > 5000)
+      diffText = diffText.slice(0, 5000) + "\n... (diff truncated)";
+    parts.push(`Diff:\n${diffText}`);
+  }
+  return parts.join("\n\n");
+}
+
+async function fmtGithubCommit(owner, repo, sha) {
+  const { data: commit } = await octokit.repos.getCommit({ owner, repo, ref: sha });
+  const parts = [
+    `Commit: ${commit.sha}`,
+    `Message: ${commit.commit.message}`,
+    `Author: ${commit.commit.author.name}`,
+    `Stats: +${commit.stats.additions}/-${commit.stats.deletions}`,
+  ];
+  const fileParts = (commit.files || []).map(
+    (f) => `  ${f.filename} (${f.status}): ${f.patch || "(binary)"}`
+  );
+  if (fileParts.length) {
+    let patchText = fileParts.join("\n");
+    if (patchText.length > 5000)
+      patchText = patchText.slice(0, 5000) + "\n... (patch truncated)";
+    parts.push(`Files changed:\n${patchText}`);
+  }
+  return parts.join("\n\n");
+}
+
+async function fmtGithubBlob(owner, repo, branch, path) {
+  const { data } = await octokit.repos.getContent({
+    owner,
+    repo,
+    path,
+    ref: branch,
+  });
+  if (Array.isArray(data)) {
+    const listing = data.map((c) => `  ${c.path} (${c.type})`).join("\n");
+    return `Directory listing at ${branch}/${path}:\n${listing}`;
+  }
+  let content = Buffer.from(data.content, "base64").toString("utf-8");
+  if (content.length > 5000)
+    content = content.slice(0, 5000) + "\n... (content truncated)";
+  return `File: ${path} (branch: ${branch})\n\n${content}`;
+}
+
+async function fmtGithubTree(owner, repo, branch, path) {
+  const { data } = await octokit.repos.getContent({
+    owner,
+    repo,
+    path: path || "",
+    ref: branch,
+  });
+  const items = Array.isArray(data) ? data : [data];
+  const listing = items
+    .map((c) => `  ${c.path} (${c.type}, ${c.size} bytes)`)
+    .join("\n");
+  return `Tree at ${branch}/${path || "(root)"}:\n${listing}`;
+}
+
+async function fmtGithubRelease(owner, repo, tag) {
+  const { data: release } = await octokit.repos.getReleaseByTag({
+    owner,
+    repo,
+    tag,
+  });
+  return [
+    `Release: ${release.name || release.tag_name}`,
+    `Tag: ${release.tag_name}`,
+    `Body:\n${release.body || "(empty)"}`,
+  ].join("\n\n");
+}
+
+async function fmtGithubCompare(owner, repo, spec) {
+  let base, head;
+  if (spec.includes("...")) [base, head] = spec.split("...", 2);
+  else if (spec.includes("..")) [base, head] = spec.split("..", 2);
+  else return null;
+  const { data } = await octokit.repos.compareCommits({
+    owner,
+    repo,
+    base,
+    head,
+  });
+  const parts = [
+    `Comparison: ${base}...${head}`,
+    `Status: ${data.status}`,
+    `Ahead by: ${data.ahead_by}, Behind by: ${data.behind_by}`,
+    `Total commits: ${data.total_commits}`,
+  ];
+  const commitSummaries = (data.commits || [])
+    .slice(0, 20)
+    .map((c) => `  ${c.sha.slice(0, 8)}: ${c.commit.message.split("\n")[0]}`);
+  if (commitSummaries.length)
+    parts.push("Commits:\n" + commitSummaries.join("\n"));
+  const fileSummaries = (data.files || [])
+    .slice(0, 30)
+    .map(
+      (f) =>
+        `  ${f.filename} (${f.status}, +${f.additions}/-${f.deletions})`
+    );
+  if (fileSummaries.length)
+    parts.push("Files changed:\n" + fileSummaries.join("\n"));
+  return parts.join("\n\n");
+}
+
+async function fmtGithubActions(owner, repo, runId) {
+  const { data: run } = await octokit.actions.getWorkflowRun({
+    owner,
+    repo,
+    run_id: Number(runId),
+  });
+  const parts = [
+    `Workflow Run: ${run.name} #${run.run_number}`,
+    `Status: ${run.status}  Conclusion: ${run.conclusion}`,
+    `SHA: ${run.head_sha}`,
+  ];
+  try {
+    const { data: jobsData } = await octokit.actions.listJobsForWorkflowRun({
+      owner,
+      repo,
+      run_id: Number(runId),
+    });
+    for (const job of jobsData.jobs) {
+      if (job.conclusion === "failure") {
+        parts.push(`Failed job: ${job.name}`);
+        for (const step of job.steps || []) {
+          if (step.conclusion === "failure")
+            parts.push(`  Failed step: ${step.name}`);
+        }
+      }
+    }
+  } catch {}
+  return parts.join("\n\n");
+}
+
+function fmtGithubWiki(owner, repo, page) {
+  if (page)
+    return `Wiki page: ${page} (from ${owner}/${repo}/wiki)\nNote: Wiki content cannot be fetched via API.`;
+  return `Wiki: ${owner}/${repo}/wiki\nNote: Wiki content cannot be fetched via API.`;
+}
+
+async function fetchGithubContent(url) {
+  if (!process.env.GITHUB_TOKEN) {
+    console.log("GITHUB_TOKEN not set.");
+    return null;
+  }
+  const { hostname, segments } = parseUrlPath(url);
+  if (!hostname || !hostname.includes("github.com")) return null;
+  const info = classifyGithubUrl(segments);
+  if (!info) return null;
+
+  try {
+    const { owner, repo, resource } = info;
+    if (resource === null) return await fmtGithubRepo(owner, repo);
+    if (resource === "issues") return await fmtGithubIssue(owner, repo, info.id);
+    if (resource === "pull") return await fmtGithubPr(owner, repo, info.id);
+    if (resource === "commit") return await fmtGithubCommit(owner, repo, info.sha);
+    if (resource === "blob")
+      return await fmtGithubBlob(owner, repo, info.branch, info.path);
+    if (resource === "tree")
+      return await fmtGithubTree(owner, repo, info.branch, info.path);
+    if (resource === "releases")
+      return await fmtGithubRelease(owner, repo, info.tag);
+    if (resource === "compare")
+      return await fmtGithubCompare(owner, repo, info.spec);
+    if (resource === "actions")
+      return await fmtGithubActions(owner, repo, info.run_id);
+    if (resource === "wiki") return fmtGithubWiki(owner, repo, info.page);
+    return null;
+  } catch (err) {
+    console.error(`GitHub API error: ${err.message}`);
+    return null;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// GitLab
+// ---------------------------------------------------------------------------
+
+const gitlab = process.env.GITLAB_TOKEN
+  ? new Gitlab({ token: process.env.GITLAB_TOKEN })
+  : null;
+
+function classifyGitlabUrl(segments) {
+  let dashIdx = segments.indexOf("-");
+  if (dashIdx === -1) {
+    if (segments.length >= 2)
+      return { projectPath: segments.join("/"), resource: null };
+    return null;
+  }
+
+  const projectPath = segments.slice(0, dashIdx).join("/");
+  const resSegments = segments.slice(dashIdx + 1);
+
+  if (!projectPath || !resSegments.length)
+    return { projectPath, resource: null };
+
+  const res = resSegments[0];
+
+  if (res === "issues" && resSegments.length >= 2)
+    return { projectPath, resource: "issues", id: resSegments[1] };
+  if (res === "merge_requests" && resSegments.length >= 2)
+    return { projectPath, resource: "merge_requests", id: resSegments[1] };
+  if ((res === "commit" || res === "commits") && resSegments.length >= 2)
+    return { projectPath, resource: "commit", sha: resSegments[1] };
+  if (res === "blob" && resSegments.length >= 2)
+    return {
+      projectPath,
+      resource: "blob",
+      branch: resSegments[1],
+      path: resSegments.slice(2).join("/"),
+    };
+  if (res === "tree" && resSegments.length >= 2)
+    return {
+      projectPath,
+      resource: "tree",
+      branch: resSegments[1],
+      path: resSegments.slice(2).join("/"),
+    };
+  if (res === "releases" && resSegments.length >= 2)
+    return { projectPath, resource: "releases", tag: resSegments[1] };
+  if (res === "compare" && resSegments.length >= 2)
+    return { projectPath, resource: "compare", spec: resSegments[1] };
+  if (res === "pipelines" && resSegments.length >= 2)
+    return { projectPath, resource: "pipelines", id: resSegments[1] };
+  if (res === "wikis")
+    return {
+      projectPath,
+      resource: "wikis",
+      page: resSegments.length >= 2 ? resSegments[1] : null,
+    };
+
+  return { projectPath, resource: "unknown" };
+}
+
+async function fetchGitlabContent(url) {
+  if (!gitlab) {
+    console.log("GITLAB_TOKEN not set.");
+    return null;
+  }
+  const { hostname, segments } = parseUrlPath(url);
+  if (!hostname || !hostname.includes("gitlab.com")) return null;
+  const info = classifyGitlabUrl(segments);
+  if (!info) return null;
+
+  try {
+    const project = await gitlab.Projects.show(info.projectPath);
+    const { resource } = info;
+
+    if (resource === null) {
+      const parts = [`Repository: ${project.path_with_namespace}`];
+      if (project.description)
+        parts.push(`Description: ${project.description}`);
+      try {
+        const readme = await gitlab.RepositoryFiles.show(
+          project.id,
+          "README.md",
+          project.default_branch
+        );
+        const content = Buffer.from(readme.content, "base64").toString("utf-8");
+        parts.push(`README (first 2000 chars):\n${content.slice(0, 2000)}`);
+      } catch {}
+      return parts.join("\n\n");
+    }
+    if (resource === "issues") {
+      const issue = await gitlab.Issues.show(project.id, Number(info.id));
+      const parts = [
+        `Issue #${issue.iid}: ${issue.title}`,
+        `State: ${issue.state}`,
+        `Body:\n${issue.description || "(empty)"}`,
+      ];
+      const notes = await gitlab.IssueNotes.all(project.id, Number(info.id), {
+        perPage: 10,
+      });
+      const noteTexts = notes.map(
+        (n) => `  Comment by ${n.author.username}: ${n.body}`
+      );
+      if (noteTexts.length)
+        parts.push("Comments (first 10):\n" + noteTexts.join("\n---\n"));
+      return parts.join("\n\n");
+    }
+    if (resource === "merge_requests") {
+      const mr = await gitlab.MergeRequests.show(project.id, Number(info.id));
+      const parts = [
+        `Merge Request !${mr.iid}: ${mr.title}`,
+        `State: ${mr.state}`,
+        `Body:\n${mr.description || "(empty)"}`,
+      ];
+      try {
+        const changes = await gitlab.MergeRequests.allDiffs(
+          project.id,
+          Number(info.id)
+        );
+        const diffParts = changes
+          .slice(0, 30)
+          .map(
+            (c) =>
+              `  ${c.new_path || "?"}: ${(c.diff || "").slice(0, 500)}`
+          );
+        if (diffParts.length) {
+          let diffText = diffParts.join("\n");
+          if (diffText.length > 5000)
+            diffText = diffText.slice(0, 5000) + "\n... (diff truncated)";
+          parts.push(`Changes:\n${diffText}`);
+        }
+      } catch {}
+      return parts.join("\n\n");
+    }
+    if (resource === "commit") {
+      const commit = await gitlab.Commits.show(project.id, info.sha);
+      const parts = [
+        `Commit: ${commit.id}`,
+        `Title: ${commit.title}`,
+        `Message: ${commit.message}`,
+        `Author: ${commit.author_name}`,
+      ];
+      try {
+        const diffs = await gitlab.Commits.showDiff(project.id, info.sha);
+        const diffParts = diffs
+          .slice(0, 30)
+          .map(
+            (d) =>
+              `  ${d.new_path || "?"}: ${(d.diff || "").slice(0, 500)}`
+          );
+        if (diffParts.length) {
+          let diffText = diffParts.join("\n");
+          if (diffText.length > 5000)
+            diffText = diffText.slice(0, 5000) + "\n... (diff truncated)";
+          parts.push(`Diff:\n${diffText}`);
+        }
+      } catch {}
+      return parts.join("\n\n");
+    }
+    if (resource === "blob") {
+      const file = await gitlab.RepositoryFiles.show(
+        project.id,
+        info.path,
+        info.branch
+      );
+      let content = Buffer.from(file.content, "base64").toString("utf-8");
+      if (content.length > 5000)
+        content = content.slice(0, 5000) + "\n... (content truncated)";
+      return `File: ${info.path} (branch: ${info.branch})\n\n${content}`;
+    }
+    if (resource === "tree") {
+      const items = await gitlab.Repositories.allRepositoryTrees(project.id, {
+        path: info.path || "",
+        ref: info.branch,
+        perPage: 100,
+      });
+      const listing = items
+        .map((item) => `  ${item.path} (${item.type})`)
+        .join("\n");
+      return `Tree at ${info.branch}/${info.path || "(root)"}:\n${listing}`;
+    }
+    if (resource === "releases") {
+      const release = await gitlab.ProjectReleases.show(
+        project.id,
+        info.tag
+      );
+      return [
+        `Release: ${release.name || release.tag_name}`,
+        `Tag: ${release.tag_name}`,
+        `Description:\n${release.description || "(empty)"}`,
+      ].join("\n\n");
+    }
+    if (resource === "compare") {
+      let base, head;
+      if (info.spec.includes("...")) [base, head] = info.spec.split("...", 2);
+      else if (info.spec.includes(".."))
+        [base, head] = info.spec.split("..", 2);
+      else return null;
+      const result = await gitlab.Repositories.compare(project.id, base, head);
+      const parts = [`Comparison: ${base}...${head}`];
+      const commits = (result.commits || [])
+        .slice(0, 20)
+        .map((c) => `  ${c.short_id || "?"}: ${c.title || ""}`);
+      if (commits.length) parts.push("Commits:\n" + commits.join("\n"));
+      const diffs = (result.diffs || [])
+        .slice(0, 30)
+        .map(
+          (d) =>
+            `  ${d.new_path || "?"}: ${(d.diff || "").slice(0, 500)}`
+        );
+      if (diffs.length) {
+        let diffText = diffs.join("\n");
+        if (diffText.length > 5000)
+          diffText = diffText.slice(0, 5000) + "\n... (diff truncated)";
+        parts.push(`Diffs:\n${diffText}`);
+      }
+      return parts.join("\n\n");
+    }
+    if (resource === "pipelines") {
+      const pipeline = await gitlab.Pipelines.show(
+        project.id,
+        Number(info.id)
+      );
+      const parts = [
+        `Pipeline #${pipeline.id}`,
+        `Status: ${pipeline.status}`,
+        `Ref: ${pipeline.ref}`,
+        `SHA: ${pipeline.sha}`,
+      ];
+      try {
+        const jobs = await gitlab.PipelineJobs.all(project.id, pipeline.id, {
+          perPage: 20,
+        });
+        const failed = jobs.filter((j) => j.status === "failed");
+        if (failed.length) {
+          parts.push("Failed jobs:");
+          for (const j of failed)
+            parts.push(`  ${j.name}: ${j.status} (stage: ${j.stage})`);
+        }
+      } catch {}
+      return parts.join("\n\n");
+    }
+    if (resource === "wikis") {
+      if (info.page) {
+        try {
+          const page = await gitlab.Wikis.show(project.id, info.page);
+          return `Wiki page: ${page.title}\n\n${page.content}`;
+        } catch {
+          return `Wiki page: ${info.page}\nNote: Could not fetch wiki page content.`;
+        }
+      }
+      try {
+        const pages = await gitlab.Wikis.all(project.id, { perPage: 20 });
+        const listing = pages.map((p) => `  ${p.slug}: ${p.title}`).join("\n");
+        return `Wiki pages:\n${listing}`;
+      } catch {
+        return "Wiki: Could not fetch wiki pages.";
+      }
+    }
+    return null;
+  } catch (err) {
+    console.error(`GitLab API error: ${err.message}`);
+    return null;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// HuggingFace
+// ---------------------------------------------------------------------------
+
+function classifyHuggingfaceUrl(segments) {
+  if (!segments.length) return null;
+  const segs = [...segments];
+  let repoType = null;
+  if (segs[0] === "datasets" || segs[0] === "spaces") {
+    repoType = segs[0] === "datasets" ? "dataset" : "space";
+    segs.splice(0, 1);
+  }
+  if (segs.length < 2) return null;
+  const repoId = `${segs[0]}/${segs[1]}`;
+  const base = { repoId, repoType };
+
+  if (segs.length === 2) return { ...base, resource: null };
+  const res = segs[2];
+
+  if (res === "blob" && segs.length >= 4)
+    return {
+      ...base,
+      resource: "blob",
+      revision: segs[3],
+      path: segs.slice(4).join("/"),
+    };
+  if (res === "resolve" && segs.length >= 4)
+    return {
+      ...base,
+      resource: "resolve",
+      revision: segs[3],
+      path: segs.slice(4).join("/"),
+    };
+  if (res === "tree" && segs.length >= 4)
+    return {
+      ...base,
+      resource: "tree",
+      revision: segs[3],
+      path: segs.slice(4).join("/"),
+    };
+  if (res === "commit" && segs.length >= 4)
+    return { ...base, resource: "commit", sha: segs[3] };
+  if (res === "discussions" && segs.length >= 4)
+    return { ...base, resource: "discussions", num: segs[3] };
+
+  return { ...base, resource: "unknown" };
+}
+
+async function fetchHuggingfaceContent(url) {
+  const token = process.env.HF_TOKEN;
+  if (!token) {
+    console.log("HF_TOKEN not set.");
+    return null;
+  }
+  const { hostname, segments } = parseUrlPath(url);
+  if (!hostname || !hostname.includes("huggingface.co")) return null;
+  const info = classifyHuggingfaceUrl(segments);
+  if (!info) return null;
+
+  try {
+    const credentials = { accessToken: token };
+    const repo = { type: info.repoType || "model", name: info.repoId };
+
+    if (info.resource === null) {
+      const parts = [`Repository: ${info.repoId}`];
+      try {
+        const resp = await downloadFile({ repo, path: "README.md", credentials });
+        if (resp) {
+          const content = await resp.text();
+          parts.push(
+            `README (first 2000 chars):\n${content.slice(0, 2000)}`
+          );
+        }
+      } catch {}
+      return parts.join("\n\n");
+    }
+    if (info.resource === "blob" || info.resource === "resolve") {
+      try {
+        const resp = await downloadFile({
+          repo,
+          path: info.path,
+          revision: info.revision,
+          credentials,
+        });
+        if (resp) {
+          let content = await resp.text();
+          if (content.length > 5000)
+            content = content.slice(0, 5000) + "\n... (content truncated)";
+          return `File: ${info.path} (revision: ${info.revision})\n\n${content}`;
+        }
+      } catch {
+        return `File: ${info.path} (revision: ${info.revision})\n(binary or unreadable file)`;
+      }
+    }
+    if (info.resource === "tree") {
+      const items = [];
+      for await (const entry of listFiles({
+        repo,
+        path: info.path || undefined,
+        revision: info.revision,
+        credentials,
+      })) {
+        items.push(`  ${entry.path} (${entry.type})`);
+        if (items.length >= 100) {
+          items.push("  ... (truncated)");
+          break;
+        }
+      }
+      return `Tree at ${info.revision}/${info.path || "(root)"}:\n${items.join("\n")}`;
+    }
+    return null;
+  } catch (err) {
+    console.error(`Hugging Face API error: ${err.message}`);
+    return null;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// URL router
+// ---------------------------------------------------------------------------
+
+async function fetchUrlContent(url) {
+  if (!url || !url.trim()) return "";
+  url = url.trim();
+  try {
+    const { hostname } = parseUrlPath(url);
+    if (hostname && hostname.includes("github.com"))
+      return await fetchGithubContent(url);
+    if (hostname && hostname.includes("gitlab.com"))
+      return await fetchGitlabContent(url);
+    if (hostname && hostname.includes("huggingface.co"))
+      return await fetchHuggingfaceContent(url);
+  } catch (err) {
+    console.error(`Error fetching URL content: ${err.message}`);
+  }
+  return "";
+}
+
+// ---------------------------------------------------------------------------
+// Agent execution via CLI
+// ---------------------------------------------------------------------------
+
+function buildAgentCommand(agent, prompt) {
+  switch (agent.promptStyle) {
+    case "flag":
+      return [agent.bin, ["-p", prompt, ...agent.initArgs]];
+    case "exec":
+      return [agent.bin, ["exec", ...agent.initArgs, prompt]];
+    default:
+      throw new Error(`Unknown promptStyle "${agent.promptStyle}" for ${agent.id}`);
+  }
+}
+
+// Extract human-readable text from agent output (some CLIs return JSON/JSONL)
+function parseAgentOutput(raw) {
+  if (!raw || typeof raw !== "string") return raw || "";
+  const trimmed = raw.trim();
+
+  // Try JSONL first (one JSON object per line — e.g. Grok CLI chat format)
+  const lines = trimmed.split("\n").filter((l) => l.trim());
+  const hasJsonLines = lines.length > 0 && lines.every((l) => {
+    const t = l.trim();
+    return t.startsWith("{") || t.startsWith("[");
+  });
+
+  if (hasJsonLines && lines.length > 1) {
+    // Parse each line, extract assistant messages
+    const assistantMsgs = [];
+    for (const line of lines) {
+      try {
+        const obj = JSON.parse(line.trim());
+        if (obj.role === "assistant" && obj.content) {
+          assistantMsgs.push(obj.content);
+        }
+      } catch { /* skip unparseable lines */ }
+    }
+    if (assistantMsgs.length) return assistantMsgs.join("\n\n");
+    // No assistant messages — try extracting any content field
+    const allContent = [];
+    for (const line of lines) {
+      try {
+        const obj = JSON.parse(line.trim());
+        if (obj.content) allContent.push(obj.content);
+      } catch { /* skip */ }
+    }
+    if (allContent.length) return allContent.join("\n\n");
+  }
+
+  // Try single JSON object
+  if (trimmed.startsWith("{") || trimmed.startsWith("[")) {
+    try {
+      const obj = JSON.parse(trimmed);
+      const text =
+        obj.result || obj.response || obj.content || obj.message ||
+        obj.text || obj.output || obj.answer ||
+        obj.choices?.[0]?.message?.content ||
+        obj.choices?.[0]?.text;
+      if (typeof text === "string") return text;
+      if (Array.isArray(obj)) {
+        const msgs = obj.map((m) => m.content || m.text || "").filter(Boolean);
+        if (msgs.length) return msgs.join("\n\n");
+      }
+    } catch { /* not valid JSON, fall through */ }
+  }
+
+  return raw;
+}
+
+// Streaming agent runner — returns a live state object + promise
+function spawnAgent(agent, prompt, agentDir) {
+  const [bin, args] = buildAgentCommand(agent, prompt);
+  const state = { stdout: "", stderr: "", done: false, ok: false };
+
+  const proc = spawn(bin, args, { cwd: agentDir, env: { ...process.env } });
+  proc.stdout.setEncoding("utf-8");
+  proc.stderr.setEncoding("utf-8");
+  proc.stdout.on("data", (chunk) => { state.stdout += chunk; });
+  proc.stderr.on("data", (chunk) => { state.stderr += chunk; });
+
+  const timer = setTimeout(() => {
+    proc.kill();
+    state.stderr += `\n[Timeout after ${AGENT_TIMEOUT_LABEL}]`;
+  }, AGENT_TIMEOUT);
+
+  state.promise = new Promise((resolve) => {
+    proc.on("close", (code) => {
+      clearTimeout(timer);
+      state.done = true;
+      state.ok = code === 0;
+      resolve(state);
+    });
+    proc.on("error", (err) => {
+      clearTimeout(timer);
+      state.done = true;
+      state.ok = false;
+      state.stderr += err.message;
+      resolve(state);
+    });
+  });
+
+  return state;
+}
+
+// Blocking agent runner — used for followups (shorter, less need for streaming)
+async function runAgent(agent, prompt, agentDir) {
+  const [bin, args] = buildAgentCommand(agent, prompt);
+  try {
+    const { stdout, stderr } = await execFileAsync(bin, args, {
+      cwd: agentDir,
+      timeout: AGENT_TIMEOUT,
+      encoding: "utf-8",
+      maxBuffer: 10 * 1024 * 1024,
+    });
+    return { ok: true, stdout, stderr };
+  } catch (err) {
+    const partialOut = err.stdout || "";
+    const partialErr = err.stderr || "";
+    const prefix = err.killed ? `[Timeout after ${AGENT_TIMEOUT_LABEL}]\n` : "";
+    return {
+      ok: false,
+      stdout: partialOut,
+      stderr: prefix + (partialErr || err.message),
+    };
+  }
+}
+
+function rebuildPrompt(rounds, followup) {
+  const parts = [];
+  for (const r of rounds) {
+    parts.push(`User: ${r.prompt}`);
+    parts.push(`Assistant: ${r.stdout}`);
+  }
+  parts.push(`User: ${followup}`);
+  return parts.join("\n\n");
+}
+
+async function runFollowup(agent, followup, agentDir, rounds) {
+  let bin = agent.bin, args;
+
+  switch (agent.followupStyle) {
+    case "continue":
+      args = ["-p", followup, ...agent.followupArgs];
+      break;
+    case "resume":
+      args = ["exec", ...agent.followupArgs, "resume", "--last", followup];
+      break;
+    case "replay": {
+      const full = rebuildPrompt(rounds, followup);
+      args = ["-p", full, ...agent.followupArgs];
+      break;
+    }
+    default:
+      throw new Error(`Unknown followupStyle "${agent.followupStyle}" for ${agent.id}`);
+  }
+
+  try {
+    const { stdout, stderr } = await execFileAsync(bin, args, {
+      cwd: agentDir,
+      timeout: AGENT_TIMEOUT,
+      encoding: "utf-8",
+      maxBuffer: 10 * 1024 * 1024,
+    });
+    return { ok: true, stdout, stderr };
+  } catch (err) {
+    const partialOut = err.stdout || "";
+    const partialErr = err.stderr || "";
+    const prefix = err.killed ? `[Timeout after ${AGENT_TIMEOUT_LABEL}]\n` : "";
+    return {
+      ok: false,
+      stdout: partialOut,
+      stderr: prefix + (partialErr || err.message),
+    };
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Prompt construction
+// ---------------------------------------------------------------------------
+
+function buildPrompt(userPrompt, repoContext = "") {
+  const parts = [SYSTEM_PREFIX];
+  if (repoContext) parts.push(`Repository context:\n${repoContext}`);
+  parts.push(userPrompt);
+  return parts.join("\n\n");
+}
+
+function stripContext(prompt) {
+  const marker = "\n\n";
+  // Find the last section which is the user query
+  // The prompt format is: SYSTEM_PREFIX + \n\n + [repo context + \n\n] + user query
+  // We strip SYSTEM_PREFIX and optional repo context
+  let rest = prompt;
+  if (rest.startsWith(SYSTEM_PREFIX)) {
+    rest = rest.slice(SYSTEM_PREFIX.length);
+    if (rest.startsWith("\n\n")) rest = rest.slice(2);
+  }
+  if (rest.startsWith("Repository context:\n")) {
+    const idx = rest.indexOf("\n\n", "Repository context:\n".length);
+    if (idx >= 0) rest = rest.slice(idx + 2);
+  }
+  return rest;
+}
+
+// ---------------------------------------------------------------------------
+// Git operations (clone, checkout, diff)
+// ---------------------------------------------------------------------------
+
+function cloneRepo(url, agentDir) {
+  const { hostname, segments } = parseUrlPath(url);
+  if (!hostname) return false;
+
+  let parsedInfo = null;
+  let cloneUrl = null;
+
+  if (hostname.includes("github.com")) {
+    parsedInfo = classifyGithubUrl(segments);
+    if (!parsedInfo) return false;
+    cloneUrl = `https://github.com/${parsedInfo.owner}/${parsedInfo.repo}.git`;
+  } else if (hostname.includes("gitlab.com")) {
+    parsedInfo = classifyGitlabUrl(segments);
+    if (!parsedInfo) return false;
+    cloneUrl = `https://gitlab.com/${parsedInfo.projectPath}.git`;
+  } else if (hostname.includes("huggingface.co")) {
+    parsedInfo = classifyHuggingfaceUrl(segments);
+    if (!parsedInfo) return false;
+    const prefix = parsedInfo.repoType ? `${parsedInfo.repoType}s/` : "";
+    cloneUrl = `https://huggingface.co/${prefix}${parsedInfo.repoId}`;
+  } else {
+    return false;
+  }
+
+  try {
+    execFileSync("git", ["clone", "--depth=1", cloneUrl, "."], {
+      cwd: agentDir,
+      timeout: 120_000,
+      stdio: "pipe",
+    });
+    checkoutRef(parsedInfo, agentDir);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function checkoutRef(parsedInfo, agentDir) {
+  const resource = parsedInfo.resource;
+  const run = (args) => {
+    try {
+      execFileSync("git", args, { cwd: agentDir, timeout: 60_000, stdio: "pipe" });
+    } catch {}
+  };
+  try {
+    if (resource === "pull" && parsedInfo.id) {
+      run(["fetch", "origin", `pull/${parsedInfo.id}/head:pr`]);
+      run(["checkout", "pr"]);
+    } else if (resource === "merge_requests" && parsedInfo.id) {
+      run(["fetch", "origin", `merge-requests/${parsedInfo.id}/head:mr`]);
+      run(["checkout", "mr"]);
+    } else if (resource === "commit" && parsedInfo.sha) {
+      run(["fetch", "--depth=1", "origin", parsedInfo.sha]);
+      run(["checkout", parsedInfo.sha]);
+    } else if (
+      (resource === "blob" || resource === "tree") &&
+      parsedInfo.branch
+    ) {
+      run(["checkout", parsedInfo.branch]);
+    } else if (
+      (resource === "blob" || resource === "resolve" || resource === "tree") &&
+      parsedInfo.revision
+    ) {
+      run(["checkout", parsedInfo.revision]);
+    }
+  } catch {} // best effort
+}
+
+function captureDiff(agentDir) {
+  try {
+    execFileSync("git", ["add", "-A"], {
+      cwd: agentDir,
+      stdio: "pipe",
+    });
+    // Exclude CLI-specific config/state files so only the agent's
+    // actual work appears in the diff.
+    const result = execFileSync(
+      "git",
+      [
+        "diff", "--cached", "--",
+        ".",
+        // Claude Code
+        ":(exclude).claude",
+        ":(exclude)CLAUDE.md",
+        // Gemini CLI
+        ":(exclude).gemini",
+        // OpenAI Codex
+        ":(exclude).codex",
+        ":(exclude)codex.json",
+        // Grok CLI
+        ":(exclude).grok",
+        // Common IDE / tool artifacts
+        ":(exclude).vscode",
+        ":(exclude)settings.json",
+      ],
+      {
+        cwd: agentDir,
+        encoding: "utf-8",
+        maxBuffer: 10 * 1024 * 1024,
+      }
+    );
+    return result.slice(0, 100_000);
+  } catch (err) {
+    console.error(`captureDiff failed: ${err.message}`);
+    return "";
+  }
+}
+
+// ---------------------------------------------------------------------------
+// HF data I/O
+// ---------------------------------------------------------------------------
+
+async function saveContentToHf(data, repoName, fileName, token) {
+  const json = JSON.stringify(data, null, 2);
+  const content = new Blob([json]);
+  if (!token) token = process.env.HF_TOKEN;
+  if (!token) throw new Error("No HF token available for upload.");
+
+  await uploadFile({
+    repo: { type: "dataset", name: repoName },
+    file: { content, path: `${fileName}.json` },
+    credentials: { accessToken: token },
+  });
+}
+
+function isFileWithinTimeFrame(filePath, days) {
+  try {
+    const timestampStr = filePath.split("/").pop().replace(".json", "");
+    // Format: YYYYMMDD_HHMMSS
+    const m = timestampStr.match(
+      /(\d{4})(\d{2})(\d{2})_(\d{2})(\d{2})(\d{2})/
+    );
+    if (!m) return false;
+    const fileDate = new Date(
+      `${m[1]}-${m[2]}-${m[3]}T${m[4]}:${m[5]}:${m[6]}`
+    );
+    const diffDays = (Date.now() - fileDate.getTime()) / (1000 * 60 * 60 * 24);
+    return diffDays <= days;
+  } catch {
+    return false;
+  }
+}
+
+async function loadContentFromHf(repoName, filePrefix) {
+  const data = [];
+  const token = process.env.HF_TOKEN;
+  const credentials = token ? { accessToken: token } : undefined;
+  const repo = { type: "dataset", name: repoName };
+
+  try {
+    for await (const file of listFiles({ repo, credentials })) {
+      if (!file.path.startsWith(`${filePrefix}/`)) continue;
+      if (!file.path.endsWith(".json")) continue;
+      if (
+        !isFileWithinTimeFrame(file.path, LEADERBOARD_UPDATE_TIME_FRAME_DAYS)
+      )
+        continue;
+
+      const resp = await downloadFile({ repo, path: file.path, credentials });
+      if (resp) {
+        const entry = JSON.parse(await resp.text());
+        entry.timestamp = file.path.split("/").pop().replace(".json", "");
+        data.push(entry);
+      }
+    }
+    return data;
+  } catch (err) {
+    console.error(`Error loading data from HF: ${err.message}`);
+    throw err;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Leaderboard computation (custom JS — no evalica)
+// ---------------------------------------------------------------------------
+
+function round2(n) {
+  return Math.round(n * 100) / 100;
+}
+
+const WINNER_MAP = {
+  left: "X",
+  right: "Y",
+  tie: "draw",
+  both_bad: "draw",
+};
+
+function computeElo(votes) {
+  const K = 32;
+  const INITIAL = 1000;
+  const scores = {};
+
+  for (const v of votes) {
+    scores[v.left] ??= INITIAL;
+    scores[v.right] ??= INITIAL;
+
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue; // tieWeight = 0
+
+    const rA = scores[v.left];
+    const rB = scores[v.right];
+    const eA = 1 / (1 + 10 ** ((rB - rA) / 400));
+    const eB = 1 - eA;
+
+    const sA = w === "X" ? 1 : 0;
+    const sB = w === "Y" ? 1 : 0;
+
+    scores[v.left] += K * (sA - eA);
+    scores[v.right] += K * (sB - eB);
+  }
+  return scores;
+}
+
+function computeAvgWinRate(votes) {
+  const wins = {};
+  const losses = {};
+
+  for (const v of votes) {
+    wins[v.left] ??= 0;
+    wins[v.right] ??= 0;
+    losses[v.left] ??= 0;
+    losses[v.right] ??= 0;
+
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue;
+
+    if (w === "X") {
+      wins[v.left]++;
+      losses[v.right]++;
+    } else {
+      wins[v.right]++;
+      losses[v.left]++;
+    }
+  }
+
+  const result = {};
+  for (const name of Object.keys(wins)) {
+    const total = wins[name] + losses[name];
+    result[name] = total > 0 ? wins[name] / total : 0;
+  }
+  return result;
+}
+
+function computeBradleyTerry(votes, iterations = 100) {
+  // Collect agents and win counts
+  const agentSet = new Set();
+  for (const v of votes) {
+    agentSet.add(v.left);
+    agentSet.add(v.right);
+  }
+  const agentList = [...agentSet];
+  const n = agentList.length;
+  const idx = Object.fromEntries(agentList.map((a, i) => [a, i]));
+
+  // Win matrix
+  const W = Array.from({ length: n }, () => new Float64Array(n));
+  for (const v of votes) {
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue;
+    const i = idx[v.left];
+    const j = idx[v.right];
+    if (w === "X") W[i][j]++;
+    else W[j][i]++;
+  }
+
+  // Iterative MLE
+  const p = new Float64Array(n).fill(1 / n);
+
+  for (let iter = 0; iter < iterations; iter++) {
+    const pNew = new Float64Array(n);
+    for (let i = 0; i < n; i++) {
+      let num = 0;
+      let den = 0;
+      for (let j = 0; j < n; j++) {
+        if (i === j) continue;
+        num += W[i][j];
+        const totalGames = W[i][j] + W[j][i];
+        if (totalGames > 0) den += totalGames / (p[i] + p[j]);
+      }
+      pNew[i] = den > 0 ? num / den : 0;
+    }
+    // Normalize
+    const sum = pNew.reduce((a, b) => a + b, 0);
+    if (sum > 0) for (let i = 0; i < n; i++) pNew[i] /= sum;
+    for (let i = 0; i < n; i++) p[i] = pNew[i];
+  }
+
+  const result = {};
+  for (let i = 0; i < n; i++) result[agentList[i]] = p[i];
+  return result;
+}
+
+function computePageRank(votes, damping = 0.85, iterations = 100) {
+  const agentSet = new Set();
+  for (const v of votes) {
+    agentSet.add(v.left);
+    agentSet.add(v.right);
+  }
+  const agentList = [...agentSet];
+  const n = agentList.length;
+  const idx = Object.fromEntries(agentList.map((a, i) => [a, i]));
+
+  // Adjacency: edge from loser to winner
+  const outLinks = Array.from({ length: n }, () => new Float64Array(n));
+  const outDegree = new Float64Array(n);
+
+  for (const v of votes) {
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue;
+    const winner = w === "X" ? idx[v.left] : idx[v.right];
+    const loser = w === "X" ? idx[v.right] : idx[v.left];
+    outLinks[loser][winner]++;
+    outDegree[loser]++;
+  }
+
+  let pr = new Float64Array(n).fill(1 / n);
+
+  for (let iter = 0; iter < iterations; iter++) {
+    const prNew = new Float64Array(n).fill((1 - damping) / n);
+    for (let j = 0; j < n; j++) {
+      if (outDegree[j] === 0) {
+        // Dangling node: distribute evenly
+        for (let i = 0; i < n; i++) prNew[i] += damping * pr[j] / n;
+      } else {
+        for (let i = 0; i < n; i++) {
+          if (outLinks[j][i] > 0) {
+            prNew[i] += damping * pr[j] * (outLinks[j][i] / outDegree[j]);
+          }
+        }
+      }
+    }
+    pr = prNew;
+  }
+
+  const result = {};
+  for (let i = 0; i < n; i++) result[agentList[i]] = pr[i];
+  return result;
+}
+
+function computeEigen(votes, iterations = 100) {
+  const agentSet = new Set();
+  for (const v of votes) {
+    agentSet.add(v.left);
+    agentSet.add(v.right);
+  }
+  const agentList = [...agentSet];
+  const n = agentList.length;
+  const idx = Object.fromEntries(agentList.map((a, i) => [a, i]));
+
+  // Adjacency matrix: wins
+  const A = Array.from({ length: n }, () => new Float64Array(n));
+  for (const v of votes) {
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue;
+    const i = idx[v.left];
+    const j = idx[v.right];
+    if (w === "X") A[i][j]++;
+    else A[j][i]++;
+  }
+
+  // Power iteration for dominant eigenvector
+  let vec = new Float64Array(n).fill(1 / Math.sqrt(n));
+
+  for (let iter = 0; iter < iterations; iter++) {
+    const newVec = new Float64Array(n);
+    for (let i = 0; i < n; i++) {
+      for (let j = 0; j < n; j++) {
+        newVec[i] += A[i][j] * vec[j];
+      }
+    }
+    // Normalize
+    const norm = Math.sqrt(newVec.reduce((s, v) => s + v * v, 0));
+    if (norm > 0) for (let i = 0; i < n; i++) newVec[i] /= norm;
+    vec = newVec;
+  }
+
+  const result = {};
+  for (let i = 0; i < n; i++) result[agentList[i]] = vec[i];
+  return result;
+}
+
+function computeNewman(votes) {
+  // Simplified Newman modularity on win-graph
+  const agentSet = new Set();
+  for (const v of votes) {
+    agentSet.add(v.left);
+    agentSet.add(v.right);
+  }
+  const agentList = [...agentSet];
+  const n = agentList.length;
+  const idx = Object.fromEntries(agentList.map((a, i) => [a, i]));
+
+  const A = Array.from({ length: n }, () => new Float64Array(n));
+  let totalEdges = 0;
+  const degree = new Float64Array(n);
+
+  for (const v of votes) {
+    const w = WINNER_MAP[v.winner];
+    if (w === "draw") continue;
+    const i = idx[v.left];
+    const j = idx[v.right];
+    if (w === "X") {
+      A[i][j]++;
+      A[j][i]++;
+    } else {
+      A[j][i]++;
+      A[i][j]++;
+    }
+    degree[i]++;
+    degree[j]++;
+    totalEdges++;
+  }
+
+  if (totalEdges === 0) {
+    const result = {};
+    for (const a of agentList) result[a] = 0;
+    return result;
+  }
+
+  // Each node in its own community -> modularity contribution
+  const result = {};
+  for (let i = 0; i < n; i++) {
+    const qi =
+      (A[i][i] || 0) / (2 * totalEdges) -
+      (degree[i] / (2 * totalEdges)) ** 2;
+    result[agentList[i]] = qi;
+  }
+  return result;
+}
+
+function computeCeiMcs(votes, conversations) {
+  const convMap = new Map();
+  for (const c of conversations) {
+    convMap.set(`${c.timestamp}|${c.left}|${c.right}`, c);
+  }
+
+  const stats = {};
+
+  for (const vote of votes) {
+    const conv = convMap.get(
+      `${vote.timestamp}|${vote.left}|${vote.right}`
+    );
+
+    for (const m of [vote.left, vote.right]) {
+      stats[m] ??= { ceiSum: 0, ceiMax: 0, selfMatches: 0, selfDraws: 0 };
+    }
+
+    if (vote.left === vote.right) {
+      stats[vote.left].selfMatches++;
+      if (vote.winner === "tie" || vote.winner === "both_bad") {
+        stats[vote.left].selfDraws++;
+      }
+      continue;
+    }
+
+    let leftScore, rightScore;
+    switch (vote.winner) {
+      case "left":
+        leftScore = 1;
+        rightScore = -1;
+        break;
+      case "right":
+        leftScore = -1;
+        rightScore = 1;
+        break;
+      case "tie":
+        leftScore = 0.3;
+        rightScore = 0.3;
+        break;
+      case "both_bad":
+        leftScore = -0.3;
+        rightScore = -0.3;
+        break;
+      default:
+        continue;
+    }
+
+    // CEI: use conversation rounds if available, default to 1
+    const leftRounds = conv?.left_rounds?.length || 1;
+    const rightRounds = conv?.right_rounds?.length || 1;
+
+    stats[vote.left].ceiMax += 1 / leftRounds;
+    stats[vote.right].ceiMax += 1 / rightRounds;
+    stats[vote.left].ceiSum += leftScore / leftRounds;
+    stats[vote.right].ceiSum += rightScore / rightRounds;
+  }
+
+  const cei = {};
+  const mcs = {};
+  for (const [agent, s] of Object.entries(stats)) {
+    cei[agent] = s.ceiMax > 0 ? round2(s.ceiSum / s.ceiMax) : null;
+    mcs[agent] = s.selfMatches > 0 ? round2(s.selfDraws / s.selfMatches) : null;
+  }
+  return { cei, mcs };
+}
+
+async function getLeaderboardData({ voteEntry = null, convEntry = null, useCache = true } = {}) {
+  // Return in-memory cache if available and no new vote to incorporate
+  if (useCache && leaderboardCache && !voteEntry) return leaderboardCache;
+
+  const token = process.env.HF_TOKEN;
+  const credentials = token ? { accessToken: token } : undefined;
+
+  if (useCache && !leaderboardCache) {
+    try {
+      const resp = await downloadFile({
+        repo: { type: "dataset", name: LEADERBOARD_REPO },
+        path: `${LEADERBOARD_FILE}.json`,
+        credentials,
+      });
+      if (resp) {
+        leaderboardCache = JSON.parse(await resp.text());
+        return leaderboardCache;
+      }
+    } catch {
+      console.log("No cached leaderboard found, computing from votes...");
+    }
+  }
+
+  const votes = await loadContentFromHf(VOTE_REPO, LEADERBOARD_FILE);
+  if (voteEntry) votes.push(voteEntry);
+  if (votes.length === 0) return [];
+
+  const conversations = await loadContentFromHf(
+    CONVERSATION_REPO,
+    LEADERBOARD_FILE
+  );
+  if (convEntry) conversations.push(convEntry);
+
+  const eloScores = computeElo(votes);
+  const winRates = computeAvgWinRate(votes);
+  const btScores = computeBradleyTerry(votes);
+  const pagerankScr = computePageRank(votes);
+  const eigenScores = computeEigen(votes);
+  const newmanScores = computeNewman(votes);
+  const { cei, mcs } = computeCeiMcs(votes, conversations);
+
+  const agentNames = Object.keys(eloScores);
+  const rows = agentNames.map((name) => ({
+    Agent: name,
+    Provider: (agentByName[name] || agentById[name])?.provider || "",
+    "Elo Score": round2(eloScores[name] ?? 0),
+    "Win Rate": round2(winRates[name] ?? 0),
+    "Conversation Efficiency Index": cei[name] ?? null,
+    "Consistency Score": mcs[name] ?? null,
+    "Bradley-Terry Coefficient": round2(btScores[name] ?? 0),
+    "Eigenvector Centrality Value": round2(eigenScores[name] ?? 0),
+    "Newman Modularity Score": round2(newmanScores[name] ?? 0),
+    "PageRank Score": round2(pagerankScr[name] ?? 0),
+  }));
+
+  rows.sort((a, b) => b["Elo Score"] - a["Elo Score"]);
+  rows.forEach((row, i) => {
+    row.Rank = i + 1;
+  });
+
+  leaderboardCache = rows;
+
+  if (voteEntry && token) {
+    saveContentToHf(rows, LEADERBOARD_REPO, LEADERBOARD_FILE, token).catch(
+      (err) => console.error(`Failed to save leaderboard cache: ${err.message}`)
+    );
+  }
+
+  return rows;
+}
+
+// ---------------------------------------------------------------------------
+// Guardrail
+// ---------------------------------------------------------------------------
+
+async function guardrailCheckSeRelevance(userInput) {
+  try {
+    const response = await openaiClient.chat.completions.create({
+      model: "openai/gpt-oss-safeguard-20b",
+      messages: [
+        {
+          role: "system",
+          content:
+            "You are a classifier that decides if a user's question is relevant to software engineering. " +
+            "If the question is about software engineering concepts, tools, processes, or code, respond with 'Yes'. " +
+            "Otherwise, respond with 'No'.",
+        },
+        { role: "user", content: userInput },
+      ],
+    });
+    const classification = response.choices[0].message.content
+      .trim()
+      .toLowerCase();
+    return classification.startsWith("yes");
+  } catch (err) {
+    console.error(`Guardrail check failed: ${err.message}`);
+    return true; // fail open
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Express app
+// ---------------------------------------------------------------------------
+
+const app = express();
+app.use(express.json({ limit: "10mb" }));
+app.use(express.static("public"));
+app.use(
+  cookieSession({
+    name: "session",
+    keys: [process.env.SESSION_SECRET || randomUUID()],
+    maxAge: 24 * 60 * 60 * 1000,
+  })
+);
+
+// In-memory battle state: battleId -> battle object
+const battles = new Map();
+
+// ---------------------------------------------------------------------------
+// Auth routes (HF OAuth)
+// ---------------------------------------------------------------------------
+
+app.get("/auth/login", (req, res) => {
+  const clientId = process.env.OAUTH_CLIENT_ID;
+  if (!clientId) return res.status(500).json({ error: "OAuth not configured" });
+
+  const redirectUri = `${req.protocol}://${req.get("host")}/auth/callback`;
+  const params = new URLSearchParams({
+    client_id: clientId,
+    redirect_uri: redirectUri,
+    response_type: "code",
+    scope: process.env.OAUTH_SCOPES || "openid profile",
+    state: randomUUID(),
+  });
+  res.redirect(`https://huggingface.co/oauth/authorize?${params}`);
+});
+
+app.get("/auth/callback", async (req, res) => {
+  const { code } = req.query;
+  try {
+    const tokenResp = await fetch("https://huggingface.co/oauth/token", {
+      method: "POST",
+      headers: { "Content-Type": "application/x-www-form-urlencoded" },
+      body: new URLSearchParams({
+        grant_type: "authorization_code",
+        code,
+        redirect_uri: `${req.protocol}://${req.get("host")}/auth/callback`,
+        client_id: process.env.OAUTH_CLIENT_ID,
+        client_secret: process.env.OAUTH_CLIENT_SECRET,
+      }),
+    });
+    const data = await tokenResp.json();
+    req.session.hfToken = data.access_token;
+    res.redirect("/");
+  } catch (err) {
+    console.error(`OAuth callback error: ${err.message}`);
+    res.redirect("/");
+  }
+});
+
+app.get("/auth/status", (req, res) => {
+  const token = req.session?.hfToken || process.env.HF_TOKEN;
+  res.json({
+    authenticated: !!token,
+    hint: SHOW_HINT_STRING ? HINT_STRING : "",
+  });
+});
+
+// ---------------------------------------------------------------------------
+// API routes
+// ---------------------------------------------------------------------------
+
+app.get("/api/config", (_req, res) => {
+  res.json({ agentTimeoutMin: AGENT_TIMEOUT / 60_000 });
+});
+
+app.get("/api/leaderboard", async (req, res) => {
+  try {
+    const data = await getLeaderboardData({ useCache: true });
+    res.json(data);
+  } catch (err) {
+    console.error(`Leaderboard error: ${err.message}`);
+    res.status(500).json({ error: err.message });
+  }
+});
+
+app.post("/api/battle/start", async (req, res) => {
+  const { prompt, repoUrl } = req.body;
+  if (!prompt || !prompt.trim()) {
+    return res.status(400).json({ error: "Prompt is required." });
+  }
+
+  // Guardrail (skip if URL provided)
+  if (!repoUrl) {
+    const isRelevant = await guardrailCheckSeRelevance(prompt);
+    if (!isRelevant) {
+      return res.status(400).json({
+        error:
+          "Oops! Try asking something about software engineering. Thanks!",
+      });
+    }
+  }
+
+  const available = availableAgents();
+  if (available.length < 2) {
+    return res
+      .status(500)
+      .json({ error: "Not enough agents available for a battle." });
+  }
+
+  // Pick 2 random agents independently (may be the same — needed for MCS self-match metric)
+  const pick = () => available[Math.floor(Math.random() * available.length)];
+  const agentA = pick();
+  const agentB = pick();
+
+  // Create temp dirs
+  const leftDir = mkdtempSync(join(tmpdir(), "agent_left_"));
+  const rightDir = mkdtempSync(join(tmpdir(), "agent_right_"));
+
+  try {
+    // Git init or clone
+    for (const d of [leftDir, rightDir]) {
+      if (repoUrl && repoUrl.trim()) {
+        cloneRepo(repoUrl, d);
+      } else {
+        execFileSync("git", ["init"], { cwd: d, stdio: "pipe" });
+      }
+    }
+
+    // Fetch context & build prompt
+    const repoContext = await fetchUrlContent(repoUrl || "");
+    const fullPrompt = buildPrompt(prompt, repoContext);
+
+    // Spawn both agents (non-blocking — returns immediately with live state)
+    const leftState = spawnAgent(agentA, fullPrompt, leftDir);
+    const rightState = spawnAgent(agentB, fullPrompt, rightDir);
+
+    // Build battle state
+    const battleId = randomUUID();
+    battles.set(battleId, {
+      id: battleId,
+      left: agentA.name,
+      right: agentB.name,
+      leftAgent: agentA,
+      rightAgent: agentB,
+      url: repoUrl || "",
+      leftDir,
+      rightDir,
+      fullPrompt,
+      leftState,
+      rightState,
+      leftDiff: null,
+      rightDiff: null,
+      leftRounds: [],
+      rightRounds: [],
+    });
+
+    // Background: when each agent finishes, capture its diff and build its
+    // initial round immediately so follow-ups can be sent independently.
+    leftState.promise.then(() => {
+      const b = battles.get(battleId);
+      if (!b) return;
+      b.leftDiff = captureDiff(leftDir);
+      b.leftRounds = [{
+        prompt: fullPrompt,
+        stdout: leftState.stdout || leftState.stderr || "",
+        stderr: leftState.stderr || "",
+        diff: b.leftDiff || "",
+      }];
+    }).catch((err) => {
+      console.error(`Left agent post-process error: ${err.message}`);
+      const b = battles.get(battleId);
+      if (!b) return;
+      b.leftRounds = [{
+        prompt: fullPrompt,
+        stdout: leftState.stdout || leftState.stderr || "",
+        stderr: leftState.stderr || "",
+        diff: "",
+      }];
+    });
+    rightState.promise.then(() => {
+      const b = battles.get(battleId);
+      if (!b) return;
+      b.rightDiff = captureDiff(rightDir);
+      b.rightRounds = [{
+        prompt: fullPrompt,
+        stdout: rightState.stdout || rightState.stderr || "",
+        stderr: rightState.stderr || "",
+        diff: b.rightDiff || "",
+      }];
+    }).catch((err) => {
+      console.error(`Right agent post-process error: ${err.message}`);
+      const b = battles.get(battleId);
+      if (!b) return;
+      b.rightRounds = [{
+        prompt: fullPrompt,
+        stdout: rightState.stdout || rightState.stderr || "",
+        stderr: rightState.stderr || "",
+        diff: "",
+      }];
+    });
+
+    // Return immediately — frontend will poll /api/battle/status
+    res.json({ battleId });
+  } catch (err) {
+    rmSync(leftDir, { recursive: true, force: true });
+    rmSync(rightDir, { recursive: true, force: true });
+    console.error(`Battle start error: ${err.message}`);
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// Poll for live agent output
+app.get("/api/battle/status/:id", (req, res) => {
+  const battle = battles.get(req.params.id);
+  if (!battle) {
+    return res.status(404).json({ error: "Battle not found (session expired)." });
+  }
+
+  const { leftState, rightState } = battle;
+
+  const formatOutput = (state) => {
+    const out = state.done ? parseAgentOutput(state.stdout) : state.stdout;
+    if (state.done && !state.ok) {
+      const prefix = out ? out + "\n\n" : "";
+      return `${prefix}**Agent error:** ${state.stderr}`;
+    }
+    // Agent exited 0 but stderr has warnings/errors — append them
+    if (state.done && state.stderr) {
+      return `${out}\n\n**Agent warnings:** ${state.stderr}`;
+    }
+    return out;
+  };
+
+  res.json({
+    leftStatus: leftState.done ? "done" : "running",
+    rightStatus: rightState.done ? "done" : "running",
+    leftOutput: formatOutput(leftState),
+    rightOutput: formatOutput(rightState),
+    leftDiff: battle.leftDiff,
+    rightDiff: battle.rightDiff,
+  });
+});
+
+app.post("/api/battle/followup", async (req, res) => {
+  const { battleId, side, prompt } = req.body;
+  const battle = battles.get(battleId);
+  if (!battle)
+    return res.status(404).json({ error: "Battle not found (session expired)." });
+  if (!prompt || !prompt.trim())
+    return res.status(400).json({ error: "Prompt is required." });
+  if (side !== "left" && side !== "right")
+    return res.status(400).json({ error: 'Side must be "left" or "right".' });
+
+  const state = side === "left" ? battle.leftState : battle.rightState;
+  if (!state.done)
+    return res.status(400).json({ error: "Agent is still running. Please wait for it to finish." });
+
+  const agent = side === "left" ? battle.leftAgent : battle.rightAgent;
+  const agentDir = side === "left" ? battle.leftDir : battle.rightDir;
+  const rounds = side === "left" ? battle.leftRounds : battle.rightRounds;
+
+  try {
+    const result = await runFollowup(agent, prompt, agentDir, rounds);
+    const diff = captureDiff(agentDir);
+
+    rounds.push({
+      prompt,
+      stdout: result.stdout || result.stderr || "",
+      stderr: result.stderr || "",
+      diff,
+    });
+
+    res.json({
+      output: result.ok
+        ? parseAgentOutput(result.stdout)
+        : `**Agent error:** ${result.stderr}`,
+      diff,
+      ok: result.ok,
+    });
+  } catch (err) {
+    console.error(`Followup error: ${err.message}`);
+    res.status(500).json({ error: err.message });
+  }
+});
+
+app.post("/api/battle/vote", async (req, res) => {
+  const { battleId, winner } = req.body;
+  const battle = battles.get(battleId);
+  if (!battle)
+    return res.status(404).json({ error: "Battle not found (session expired)." });
+
+  const validWinners = ["left", "right", "tie", "both_bad"];
+  if (!validWinners.includes(winner))
+    return res.status(400).json({ error: "Invalid winner value." });
+
+  const token = req.session?.hfToken || process.env.HF_TOKEN;
+  const timestamp = new Date()
+    .toISOString()
+    .replace(/[-:T]/g, (c) => (c === "T" ? "_" : ""))
+    .replace(/\.\d+Z$/, "");
+  const fileName = `${LEADERBOARD_FILE}/${timestamp}`;
+
+  const voteEntry = {
+    left: battle.left,
+    right: battle.right,
+    winner,
+    timestamp,
+  };
+
+  // Strip context from first round prompts before saving
+  const leftRoundsClean = battle.leftRounds.map((r, i) => ({
+    ...r,
+    prompt: i === 0 ? stripContext(r.prompt) : r.prompt,
+  }));
+  const rightRoundsClean = battle.rightRounds.map((r, i) => ({
+    ...r,
+    prompt: i === 0 ? stripContext(r.prompt) : r.prompt,
+  }));
+
+  const convData = {
+    left: battle.left,
+    right: battle.right,
+    url: battle.url,
+    left_rounds: leftRoundsClean,
+    right_rounds: rightRoundsClean,
+    winner,
+    timestamp,
+  };
+
+  // Save to HF (fire and forget)
+  try {
+    await Promise.all([
+      saveContentToHf(voteEntry, VOTE_REPO, fileName, token),
+      saveContentToHf(convData, CONVERSATION_REPO, fileName, token),
+    ]);
+  } catch (err) {
+    console.error(`HF upload error: ${err.message}`);
+  }
+
+  // Clean up
+  rmSync(battle.leftDir, { recursive: true, force: true });
+  rmSync(battle.rightDir, { recursive: true, force: true });
+  battles.delete(battleId);
+
+  // Recompute leaderboard
+  try {
+    const leaderboard = await getLeaderboardData({
+      voteEntry,
+      convEntry: convData,
+      useCache: false,
+    });
+    res.json({ leaderboard, agentA: battle.left, agentB: battle.right });
+  } catch (err) {
+    console.error(`Leaderboard recompute error: ${err.message}`);
+    res.json({ leaderboard: [], agentA: battle.left, agentB: battle.right });
+  }
+});
+
+// ---------------------------------------------------------------------------
+// Start server
+// ---------------------------------------------------------------------------
+
+process.on("uncaughtException", (err) => {
+  console.error("Uncaught exception:", err);
+});
+process.on("unhandledRejection", (reason) => {
+  console.error("Unhandled rejection:", reason);
+});
+
+const PORT = process.env.PORT || 7860;
+
+(async () => {
+  // Load agent CLI metadata from HF before accepting requests
+  try {
+    await loadAgentsFromHf();
+  } catch (err) {
+    console.error(`Failed to load agents from HF: ${err.message}`);
+    process.exit(1);
+  }
+
+  const available = availableAgents();
+  console.log(
+    `Available agents: ${available.map((a) => a.name).join(", ") || "(none)"}`
+  );
+
+  // Preload leaderboard
+  try {
+    const data = await getLeaderboardData({ useCache: true });
+    console.log(`Leaderboard preloaded: ${data.length} entries.`);
+  } catch (err) {
+    console.error(`Failed to preload leaderboard: ${err.message}`);
+  }
+
+  const server = app.listen(PORT, () => {
+    console.log(`SWE-Agent-Arena running on http://localhost:${PORT}`);
+  });
+  server.on("error", (err) => {
+    console.error("Server error:", err);
+  });
+})();

package-lock.json

@@ -0,0 +1,1668 @@
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+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
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+        "dotenv": "^16.x",
+        "express": "^5.x",
+        "openai": "^4.x",
+        "which": "^4.x"
+      }
+    },
+    "node_modules/@gitbeaker/core": {
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+      "license": "MIT",
+      "dependencies": {
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+        "qs": "^6.12.2",
+        "xcase": "^2.0.1"
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+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
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+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^3.1.1"
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+      "bin": {
+        "node-which": "bin/which.js"
+      },
+      "engines": {
+        "node": "^16.13.0 || >=18.0.0"
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+      "license": "ISC"
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+      "license": "MIT"
+    }
+  }
+}

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "swe-agent-arena",
+  "type": "module",
+  "scripts": {
+    "start": "node app.js"
+  },
+  "dependencies": {
+    "@huggingface/hub": "^1.x",
+    "@octokit/rest": "^21.x",
+    "@gitbeaker/rest": "^40.x",
+    "cookie-session": "^2.x",
+    "diff2html": "^3.x",
+    "dotenv": "^16.x",
+    "express": "^5.x",
+    "openai": "^4.x",
+    "which": "^4.x"
+  }
+}

public/index.html

@@ -0,0 +1,684 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>SWE-Agent-Arena</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css" />
+  <style>
+    :root {
+      --bg: #f8f9fa;
+      --card: #fff;
+      --border: #dee2e6;
+      --primary: #4f46e5;
+      --primary-hover: #4338ca;
+      --text: #212529;
+      --muted: #6c757d;
+      --success: #198754;
+      --danger: #dc3545;
+    }
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
+    .container { max-width: 1400px; margin: 0 auto; padding: 0 20px; }
+    header { background: var(--primary); color: #fff; padding: 16px 0; margin-bottom: 24px; }
+    header h1 { font-size: 1.5rem; }
+    .tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
+    .tab { padding: 10px 24px; cursor: pointer; border: none; background: none; font-size: 1rem; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -2px; }
+    .tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
+    .tab-content { display: none; }
+    .tab-content.active { display: block; }
+    .card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 20px; margin-bottom: 16px; }
+    h2 { margin-bottom: 12px; }
+    h3 { margin-bottom: 8px; }
+    .row { display: flex; gap: 16px; }
+    .col { flex: 1; min-width: 0; }
+    input[type="text"], textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.95rem; font-family: inherit; }
+    textarea { resize: vertical; min-height: 60px; }
+    button { padding: 10px 20px; border: none; border-radius: 6px; font-size: 0.95rem; cursor: pointer; font-family: inherit; }
+    .btn-primary { background: var(--primary); color: #fff; }
+    .btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
+    .btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
+    .btn-outline { background: none; border: 1px solid var(--border); color: var(--text); }
+    .btn-outline:hover { background: var(--bg); }
+    .hidden { display: none !important; }
+    .agent-panel { border: 1px solid var(--border); border-radius: 8px; padding: 16px; background: var(--card); }
+    .agent-panel h3 { margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
+    .agent-output { white-space: pre-wrap; word-wrap: break-word; font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.85rem; margin-bottom: 16px; max-height: 400px; overflow-y: auto; }
+    .diff-container { margin-top: 12px; max-height: 500px; overflow: auto; position: relative; border: 1px solid var(--border); border-radius: 6px; }
+    .diff-container table { width: max-content; min-width: 100%; }
+    .vote-panel { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
+    .vote-btn { padding: 10px 24px; font-size: 1rem; }
+    .vote-btn.selected { outline: 3px solid var(--primary); outline-offset: 2px; }
+    table { width: 100%; border-collapse: collapse; }
+    th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); }
+    th { background: var(--bg); font-weight: 600; position: sticky; top: 0; cursor: pointer; user-select: none; }
+    th:hover { background: #e9ecef; }
+    tr:hover td { background: #f8f9fa; }
+    .leaderboard-wrapper { max-height: 600px; overflow-y: auto; border: 1px solid var(--border); border-radius: 8px; }
+    .search-input { max-width: 300px; margin-bottom: 12px; }
+    .hint { color: var(--muted); font-style: italic; margin-bottom: 12px; }
+    .thanks { color: var(--success); font-size: 1.2rem; font-weight: 600; padding: 16px; text-align: center; }
+    .error-msg { color: var(--danger); padding: 12px; background: #fff5f5; border: 1px solid #fecdd3; border-radius: 6px; margin-bottom: 12px; }
+    .loading { text-align: center; padding: 40px; color: var(--muted); }
+    .spinner { display: inline-block; width: 24px; height: 24px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; margin-right: 8px; vertical-align: middle; }
+    @keyframes spin { to { transform: rotate(360deg); } }
+    .citation { background: #f1f5f9; padding: 16px; border-radius: 6px; font-family: monospace; font-size: 0.8rem; white-space: pre-wrap; margin-top: 16px; }
+    .user-query { color: #0066cc; background: #f0f7ff; padding: 10px; border-radius: 5px; margin-bottom: 12px; }
+    .followup-row { display: flex; gap: 8px; align-items: flex-end; }
+    .followup-row input { flex: 1; }
+    .tos { color: var(--muted); font-size: 0.85rem; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); }
+    @media (max-width: 768px) { .row { flex-direction: column; } }
+  </style>
+</head>
+<body>
+  <header>
+    <div class="container">
+      <h1>&#9876;&#65039; SWE-Agent-Arena</h1>
+    </div>
+  </header>
+
+  <div class="container">
+    <div class="tabs">
+      <button class="tab active" data-tab="leaderboard">&#127942; Leaderboard</button>
+      <button class="tab" data-tab="arena">&#9876;&#65039; Arena</button>
+    </div>
+
+    <!-- ============ LEADERBOARD TAB ============ -->
+    <div id="tab-leaderboard" class="tab-content active">
+      <h2>&#127942; LLM4ASE Leaderboard</h2>
+      <p>Community-driven evaluation of LLMs on real agentic coding tasks.</p>
+      <p class="hint">
+        SWE-Agent-Arena pits coding agents pairwise in blind agentic coding battles.
+        Each agent uses its own CLI tool and default model, working in identical sandboxed environments.
+        Community votes determine the rankings.
+      </p>
+
+      <input type="text" class="search-input" id="leaderboard-search" placeholder="Search agents..." />
+
+      <div class="leaderboard-wrapper">
+        <table id="leaderboard-table">
+          <thead>
+            <tr>
+              <th data-col="Rank">Rank</th>
+              <th data-col="Agent">Agent</th>
+              <th data-col="Provider">Provider</th>
+              <th data-col="Elo Score">Elo Score</th>
+              <th data-col="Win Rate">Win Rate</th>
+              <th data-col="Conversation Efficiency Index">CEI</th>
+              <th data-col="Consistency Score">MCS</th>
+              <th data-col="Bradley-Terry Coefficient">Bradley-Terry</th>
+              <th data-col="PageRank Score">PageRank</th>
+            </tr>
+          </thead>
+          <tbody id="leaderboard-body"></tbody>
+        </table>
+      </div>
+
+      <div class="citation">
+Made with &#10084;&#65039; for SWE-Agent-Arena. If this work is useful to you, please consider citing:
+
+@inproceedings{zhao2025se,
+  title={SE Arena: An Interactive Platform for Evaluating Foundation Models in Software Engineering},
+  author={Zhao, Zhimin},
+  booktitle={2025 IEEE/ACM Second International Conference on AI Foundation Models and Software Engineering (Forge)},
+  pages={78--81},
+  year={2025},
+  organization={IEEE}
+}
+      </div>
+    </div>
+
+    <!-- ============ ARENA TAB ============ -->
+    <div id="tab-arena" class="tab-content">
+      <h2>&#9876;&#65039; SWE-Agent-Arena</h2>
+      <p>Blind pairwise agentic coding battles &mdash; same scaffold, different CLI agent</p>
+
+      <div class="card">
+        <h3>&#128220; How It Works</h3>
+        <ul style="margin-left: 20px; margin-top: 8px;">
+          <li><strong>Blind Comparison</strong>: Submit a coding task to two anonymous agents, each a different CLI tool with its own default model.</li>
+          <li><strong>Same Scaffold, Different Brain</strong>: Both agents run in identical sandboxed temp directories. Only the CLI agent differs.</li>
+          <li><strong>Real Diffs</strong>: Each agent works in its own isolated git repo. You see actual code changes, not just chat.</li>
+          <li><strong>Multi-round &amp; Vote</strong>: Send follow-ups, then vote for the better one.</li>
+        </ul>
+        <p class="hint" style="margin-top: 8px;" id="timeout-hint">Note: Agent sessions that take longer than 10 minutes will be terminated.</p>
+      </div>
+
+      <!-- Auth -->
+      <div id="auth-section" class="card">
+        <div id="auth-hint">
+          <p><strong>Please sign in to vote!</strong></p>
+          <p class="hint" id="hint-text"></p>
+        </div>
+        <button class="btn-primary" id="login-btn" onclick="window.location.href='/auth/login'">Sign in with Hugging Face</button>
+        <span id="auth-status" class="hidden" style="color: var(--success); font-weight: 600;">&#10003; Signed in</span>
+      </div>
+
+      <!-- Error -->
+      <div id="error-msg" class="error-msg hidden"></div>
+
+      <!-- Input -->
+      <div id="input-section" class="card">
+        <input type="text" id="repo-url" placeholder="Optional: Enter any GitHub, GitLab, or Hugging Face URL." style="margin-bottom: 10px;" />
+        <textarea id="prompt-input" placeholder="Enter your task for both agents here." rows="3"></textarea>
+        <button class="btn-primary" id="battle-btn" disabled style="margin-top: 10px;">Battle!</button>
+      </div>
+
+      <!-- Loading -->
+      <div id="loading" class="card hidden">
+        <div class="loading">
+          <span class="spinner"></span> Running agents... This may take a few minutes.
+        </div>
+      </div>
+
+      <!-- User query display -->
+      <div id="query-display" class="hidden">
+        <div class="user-query" id="query-text"></div>
+      </div>
+
+      <!-- Agent outputs -->
+      <div id="results-section" class="hidden">
+        <div class="row">
+          <div class="col">
+            <div class="agent-panel">
+              <h3>Agent A</h3>
+              <div class="agent-output" id="output-a"></div>
+              <div class="diff-container" id="diff-a"></div>
+            </div>
+          </div>
+          <div class="col">
+            <div class="agent-panel">
+              <h3>Agent B</h3>
+              <div class="agent-output" id="output-b"></div>
+              <div class="diff-container" id="diff-b"></div>
+            </div>
+          </div>
+        </div>
+
+        <!-- Follow-up inputs -->
+        <div class="card" id="followup-section" style="margin-top: 16px;">
+          <div class="row">
+            <div class="col">
+              <div class="followup-row">
+                <input type="text" id="followup-a" placeholder="Send follow-up to Agent A..." />
+                <button class="btn-outline" id="send-a-btn" disabled>Send to A</button>
+              </div>
+            </div>
+            <div class="col">
+              <div class="followup-row">
+                <input type="text" id="followup-b" placeholder="Send follow-up to Agent B..." />
+                <button class="btn-outline" id="send-b-btn" disabled>Send to B</button>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <!-- Vote -->
+        <div class="card" id="vote-section" style="margin-top: 16px;">
+          <h3>Which agent do you prefer?</h3>
+          <div class="vote-panel" style="margin-top: 12px;">
+            <button class="btn-outline vote-btn" data-vote="left">&#128077; Agent A</button>
+            <button class="btn-outline vote-btn" data-vote="right">&#128077; Agent B</button>
+            <button class="btn-outline vote-btn" data-vote="tie">&#129309; Tie</button>
+            <button class="btn-outline vote-btn" data-vote="both_bad">&#128078; Tie (Both Bad)</button>
+            <button class="btn-primary vote-btn" id="submit-vote-btn" disabled>Submit Vote</button>
+          </div>
+        </div>
+      </div>
+
+      <!-- Thanks -->
+      <div id="thanks-msg" class="thanks hidden">Thanks for your vote! Identities revealed above.</div>
+
+      <!-- Reveal -->
+      <div id="reveal-section" class="card hidden">
+        <p><strong>Agent A:</strong> <span id="reveal-a"></span></p>
+        <p><strong>Agent B:</strong> <span id="reveal-b"></span></p>
+      </div>
+
+      <div class="tos">
+        <h3>Terms of Service</h3>
+        <p><em>Users are required to agree to the following terms before using the service:</em></p>
+        <ul style="margin-left: 20px; margin-top: 8px;">
+          <li>The service is a <strong>research preview</strong>. It only provides limited safety measures and may generate offensive content.</li>
+          <li>It must not be used for any <strong>illegal, harmful, violent, racist, or sexual</strong> purposes.</li>
+          <li>Please do not upload any <strong>private</strong> information.</li>
+          <li>The service collects user dialogue data and reserves the right to distribute it under a <strong>Creative Commons Attribution (CC-BY)</strong> or similar license.</li>
+        </ul>
+      </div>
+    </div>
+  </div>
+
+  <script src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html.min.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>
+  <script>
+    // ---------------------------------------------------------------------------
+    // State
+    // ---------------------------------------------------------------------------
+    let currentBattleId = null;
+    let selectedVote = null;
+    let isAuthenticated = false;
+    let leaderboardData = [];
+    let sortCol = "Elo Score";
+    let sortAsc = false;
+    let followupSetup = false;
+    let followupInFlight = { left: false, right: false };
+
+    // ---------------------------------------------------------------------------
+    // Tabs
+    // ---------------------------------------------------------------------------
+    document.querySelectorAll(".tab").forEach((tab) => {
+      tab.addEventListener("click", () => {
+        document.querySelectorAll(".tab").forEach((t) => t.classList.remove("active"));
+        document.querySelectorAll(".tab-content").forEach((c) => c.classList.remove("active"));
+        tab.classList.add("active");
+        document.getElementById(`tab-${tab.dataset.tab}`).classList.add("active");
+      });
+    });
+
+    // ---------------------------------------------------------------------------
+    // Auth
+    // ---------------------------------------------------------------------------
+    async function checkAuth() {
+      try {
+        const resp = await fetch("/auth/status");
+        const data = await resp.json();
+        isAuthenticated = data.authenticated;
+        if (isAuthenticated) {
+          document.getElementById("login-btn").classList.add("hidden");
+          document.getElementById("auth-hint").classList.add("hidden");
+          document.getElementById("auth-status").classList.remove("hidden");
+        } else if (data.hint) {
+          document.getElementById("hint-text").textContent = data.hint;
+        }
+      } catch (err) {
+        console.error("Auth check failed:", err);
+        // Fail open — allow usage without auth check
+      }
+    }
+    checkAuth();
+
+    // ---------------------------------------------------------------------------
+    // Config (timeout hint)
+    // ---------------------------------------------------------------------------
+    fetch("/api/config").then(r => r.json()).then(cfg => {
+      const hint = document.getElementById("timeout-hint");
+      if (hint) hint.textContent = `Note: Agent sessions that take longer than ${cfg.agentTimeoutMin} minutes will be terminated.`;
+    }).catch(() => {});
+
+    // ---------------------------------------------------------------------------
+    // Leaderboard
+    // ---------------------------------------------------------------------------
+    async function loadLeaderboard() {
+      try {
+        const resp = await fetch("/api/leaderboard");
+        leaderboardData = await resp.json();
+        renderLeaderboard();
+      } catch (err) {
+        console.error("Failed to load leaderboard:", err);
+      }
+    }
+
+    function renderLeaderboard(filter = "") {
+      const tbody = document.getElementById("leaderboard-body");
+      const filtered = filter
+        ? leaderboardData.filter((r) =>
+            (r.Agent || "").toLowerCase().includes(filter.toLowerCase())
+          )
+        : leaderboardData;
+
+      // Sort
+      const sorted = [...filtered].sort((a, b) => {
+        const va = a[sortCol] ?? 0;
+        const vb = b[sortCol] ?? 0;
+        if (typeof va === "string") return sortAsc ? va.localeCompare(vb) : vb.localeCompare(va);
+        return sortAsc ? va - vb : vb - va;
+      });
+
+      tbody.innerHTML = sorted
+        .map(
+          (r) => `<tr>
+          <td>${r.Rank ?? ""}</td>
+          <td>${r.Agent ?? ""}</td>
+          <td>${r.Provider ?? ""}</td>
+          <td>${r["Elo Score"] ?? ""}</td>
+          <td>${r["Win Rate"] != null ? r["Win Rate"].toFixed(2) : ""}</td>
+          <td>${r["Conversation Efficiency Index"] != null ? r["Conversation Efficiency Index"] : ""}</td>
+          <td>${r["Consistency Score"] != null ? r["Consistency Score"] : ""}</td>
+          <td>${r["Bradley-Terry Coefficient"] != null ? Number(r["Bradley-Terry Coefficient"]).toFixed(4) : ""}</td>
+          <td>${r["PageRank Score"] != null ? Number(r["PageRank Score"]).toFixed(4) : ""}</td>
+        </tr>`
+        )
+        .join("");
+    }
+
+    document.getElementById("leaderboard-search").addEventListener("input", (e) => {
+      renderLeaderboard(e.target.value);
+    });
+
+    document.querySelectorAll("#leaderboard-table th").forEach((th) => {
+      th.addEventListener("click", () => {
+        const col = th.dataset.col;
+        if (sortCol === col) sortAsc = !sortAsc;
+        else { sortCol = col; sortAsc = false; }
+        renderLeaderboard(document.getElementById("leaderboard-search").value);
+      });
+    });
+
+    loadLeaderboard();
+
+    // ---------------------------------------------------------------------------
+    // Battle
+    // ---------------------------------------------------------------------------
+    const promptInput = document.getElementById("prompt-input");
+    const battleBtn = document.getElementById("battle-btn");
+
+    promptInput.addEventListener("input", () => {
+      battleBtn.disabled = !promptInput.value.trim();
+    });
+
+    battleBtn.addEventListener("click", startBattle);
+
+    let pollTimer = null;
+
+    async function startBattle() {
+      const prompt = promptInput.value.trim();
+      if (!prompt) return;
+      const repoUrl = document.getElementById("repo-url").value.trim();
+
+      // Reset UI
+      hideEl("error-msg");
+      hideEl("results-section");
+      hideEl("thanks-msg");
+      hideEl("reveal-section");
+      hideEl("query-display");
+      showEl("loading");
+      battleBtn.disabled = true;
+      promptInput.disabled = true;
+      document.getElementById("repo-url").disabled = true;
+      currentBattleId = null;
+      selectedVote = null;
+      followupSetup = false;
+      followupInFlight = { left: false, right: false };
+      if (pollTimer) { clearInterval(pollTimer); pollTimer = null; }
+
+      try {
+        const resp = await fetch("/api/battle/start", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ prompt, repoUrl }),
+        });
+        const data = await resp.json();
+
+        if (!resp.ok) {
+          showError(data.error || "Battle failed.");
+          resetInputs();
+          hideEl("loading");
+          return;
+        }
+
+        currentBattleId = data.battleId;
+
+        // Display query
+        document.getElementById("query-text").innerHTML =
+          `<strong>Your Query:</strong> ${escapeHtml(prompt)}` +
+          (repoUrl ? `<br/><strong>URL:</strong> ${escapeHtml(repoUrl)}` : "");
+        showEl("query-display");
+
+        // Show panels immediately with "working" placeholders
+        document.getElementById("output-a").textContent = "Agent is working...";
+        document.getElementById("output-b").textContent = "Agent is working...";
+        document.getElementById("diff-a").innerHTML = "";
+        document.getElementById("diff-b").innerHTML = "";
+        showEl("results-section");
+        hideEl("followup-section");
+        hideEl("vote-section");
+        hideEl("input-section");
+        hideEl("loading");
+
+        // Start polling for live output
+        pollBattleStatus();
+      } catch (err) {
+        showError(err.message);
+        resetInputs();
+        hideEl("loading");
+      }
+    }
+
+    function pollBattleStatus() {
+      const outputA = document.getElementById("output-a");
+      const outputB = document.getElementById("output-b");
+      let leftDone = false, rightDone = false;
+      let lastLeftDiff = null, lastRightDiff = null;
+
+      pollTimer = setInterval(async () => {
+        if (!currentBattleId) { clearInterval(pollTimer); return; }
+        try {
+          const resp = await fetch(`/api/battle/status/${currentBattleId}`);
+          if (!resp.ok) return;
+          const data = await resp.json();
+
+          // Update output panels with live text
+          outputA.textContent = data.leftOutput || (data.leftStatus === "running" ? "Agent is working..." : "(no output)");
+          outputB.textContent = data.rightOutput || (data.rightStatus === "running" ? "Agent is working..." : "(no output)");
+
+          // Auto-scroll output panels
+          outputA.scrollTop = outputA.scrollHeight;
+          outputB.scrollTop = outputB.scrollHeight;
+
+          // Render diff when a side finishes
+          if (data.leftStatus === "done" && data.leftDiff !== lastLeftDiff) {
+            lastLeftDiff = data.leftDiff;
+            renderDiff("diff-a", data.leftDiff);
+          }
+          if (data.rightStatus === "done" && data.rightDiff !== lastRightDiff) {
+            lastRightDiff = data.rightDiff;
+            renderDiff("diff-b", data.rightDiff);
+          }
+
+          // Show followup as soon as either side finishes
+          if (data.leftStatus === "done" || data.rightStatus === "done") {
+            showEl("followup-section");
+            if (!followupSetup) {
+              setupFollowup();
+              followupSetup = true;
+            }
+            // Enable/disable each side independently, respecting in-flight state
+            if (!followupInFlight.left) {
+              document.getElementById("followup-a").disabled = data.leftStatus !== "done";
+              document.getElementById("send-a-btn").disabled = data.leftStatus !== "done" || !document.getElementById("followup-a").value.trim();
+            }
+            if (!followupInFlight.right) {
+              document.getElementById("followup-b").disabled = data.rightStatus !== "done";
+              document.getElementById("send-b-btn").disabled = data.rightStatus !== "done" || !document.getElementById("followup-b").value.trim();
+            }
+          }
+
+          // Both done — stop polling, show voting
+          if (data.leftStatus === "done" && data.rightStatus === "done") {
+            clearInterval(pollTimer);
+            pollTimer = null;
+            showEl("vote-section");
+            document.querySelectorAll(".vote-btn").forEach((b) => b.classList.remove("selected"));
+            document.getElementById("submit-vote-btn").disabled = true;
+          }
+        } catch {
+          // ignore transient polling errors
+        }
+      }, 1000);
+    }
+
+    // ---------------------------------------------------------------------------
+    // Followup
+    // ---------------------------------------------------------------------------
+    function setupFollowup() {
+      const followupA = document.getElementById("followup-a");
+      const followupB = document.getElementById("followup-b");
+      const sendABtn = document.getElementById("send-a-btn");
+      const sendBBtn = document.getElementById("send-b-btn");
+
+      followupA.value = "";
+      followupB.value = "";
+
+      followupA.oninput = () => { sendABtn.disabled = !followupA.value.trim(); };
+      followupB.oninput = () => { sendBBtn.disabled = !followupB.value.trim(); };
+
+      sendABtn.onclick = () => sendFollowup("left", followupA, sendABtn, "output-a", "diff-a");
+      sendBBtn.onclick = () => sendFollowup("right", followupB, sendBBtn, "output-b", "diff-b");
+    }
+
+    async function sendFollowup(side, input, btn, outputId, diffId) {
+      const prompt = input.value.trim();
+      if (!prompt || !currentBattleId) return;
+
+      followupInFlight[side] = true;
+      input.disabled = true;
+      btn.disabled = true;
+      btn.textContent = "Processing...";
+
+      try {
+        const resp = await fetch("/api/battle/followup", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ battleId: currentBattleId, side, prompt }),
+        });
+        const data = await resp.json();
+
+        if (!resp.ok) {
+          showError(data.error || "Followup failed.");
+          return;
+        }
+
+        // Append output
+        const outputEl = document.getElementById(outputId);
+        outputEl.textContent += `\n\n--- Follow-up ---\nUser: ${prompt}\n\nAgent: ${data.output || "(no output)"}`;
+        renderDiff(diffId, data.diff);
+      } catch (err) {
+        showError(err.message);
+      } finally {
+        followupInFlight[side] = false;
+        input.value = "";
+        input.disabled = false;
+        btn.disabled = true;
+        btn.textContent = side === "left" ? "Send to A" : "Send to B";
+      }
+    }
+
+    // ---------------------------------------------------------------------------
+    // Voting
+    // ---------------------------------------------------------------------------
+    document.querySelectorAll(".vote-btn[data-vote]").forEach((btn) => {
+      btn.addEventListener("click", () => {
+        document.querySelectorAll(".vote-btn[data-vote]").forEach((b) => b.classList.remove("selected"));
+        btn.classList.add("selected");
+        selectedVote = btn.dataset.vote;
+        document.getElementById("submit-vote-btn").disabled = false;
+      });
+    });
+
+    document.getElementById("submit-vote-btn").addEventListener("click", submitVote);
+
+    async function submitVote() {
+      if (!selectedVote || !currentBattleId) return;
+
+      document.getElementById("submit-vote-btn").disabled = true;
+
+      try {
+        const resp = await fetch("/api/battle/vote", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ battleId: currentBattleId, winner: selectedVote }),
+        });
+        const data = await resp.json();
+
+        if (!resp.ok) {
+          showError(data.error || "Vote failed.");
+          return;
+        }
+
+        // Reveal agents
+        document.getElementById("reveal-a").textContent = data.agentA || "Unknown";
+        document.getElementById("reveal-b").textContent = data.agentB || "Unknown";
+        showEl("reveal-section");
+        showEl("thanks-msg");
+
+        // Hide vote + followup
+        hideEl("vote-section");
+        hideEl("followup-section");
+
+        // Update leaderboard
+        if (data.leaderboard && data.leaderboard.length) {
+          leaderboardData = data.leaderboard;
+          renderLeaderboard(document.getElementById("leaderboard-search").value);
+        }
+
+        currentBattleId = null;
+
+        // Re-enable for next battle after a delay
+        setTimeout(() => {
+          hideEl("results-section");
+          hideEl("thanks-msg");
+          hideEl("reveal-section");
+          hideEl("query-display");
+          // Reset internal visibility of nested sections for next battle
+          document.getElementById("vote-section").classList.remove("hidden");
+          document.getElementById("followup-section").classList.remove("hidden");
+          // Show input and reset fields
+          showEl("input-section");
+          resetInputs();
+        }, 5000);
+      } catch (err) {
+        showError(err.message);
+        document.getElementById("submit-vote-btn").disabled = false;
+      }
+    }
+
+    // ---------------------------------------------------------------------------
+    // Helpers
+    // ---------------------------------------------------------------------------
+    function showEl(id) { document.getElementById(id).classList.remove("hidden"); }
+    function hideEl(id) { document.getElementById(id).classList.add("hidden"); }
+
+    function showError(msg) {
+      const el = document.getElementById("error-msg");
+      el.textContent = msg;
+      el.classList.remove("hidden");
+      setTimeout(() => el.classList.add("hidden"), 8000);
+    }
+
+    function resetInputs() {
+      promptInput.disabled = false;
+      promptInput.value = "";
+      document.getElementById("repo-url").disabled = false;
+      battleBtn.disabled = true;
+      showEl("input-section");
+    }
+
+    function escapeHtml(str) {
+      const div = document.createElement("div");
+      div.textContent = str;
+      return div.innerHTML;
+    }
+
+    function renderDiff(containerId, diffStr) {
+      const container = document.getElementById(containerId);
+      if (!diffStr || !diffStr.trim()) {
+        container.innerHTML = "<em>No diff</em>";
+        return;
+      }
+      try {
+        const targetEl = document.createElement("div");
+        container.innerHTML = "";
+        container.appendChild(targetEl);
+        const diff2htmlUi = new Diff2HtmlUI(targetEl, diffStr, {
+          drawFileList: false,
+          matching: "lines",
+          outputFormat: "side-by-side",
+        });
+        diff2htmlUi.draw();
+      } catch {
+        container.innerHTML = `<pre>${escapeHtml(diffStr)}</pre>`;
+      }
+    }
+  </script>
+</body>
+</html>