Publish Layerfault deep challenge LF-CH-MCPX-0003

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "agent-mcp-static"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-MCPX-0003",
+  "difficulty": "hard",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [
+      "LF-MCP-CREDENTIAL-IN-URL"
+    ],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MCPX-0003"
+  ],
+  "related_cases": [],
+  "repo_name": "agent-mcp-url-credential",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "medium",
+  "techniques": [
+    "mcp",
+    "url",
+    "credential"
+  ],
+  "transformations": []
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "mcp.json"
+  ],
+  "family": "mcpx",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "agent-mcp-url-credential"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "agent-mcp-static"
+    ],
+    "control_type": "positive",
+    "difficulty": "hard",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-MCPX-0003"
+    ],
+    "related_cases": [],
+    "severity": "medium",
+    "techniques": [
+      "mcp",
+      "url",
+      "credential"
+    ],
+    "transformations": []
+  },
+  "corpus_id": "LF-CH-MCPX-0003",
+  "description": "Agent mcp url credential.",
+  "expected_rules": [
+    "LF-MCP-CREDENTIAL-IN-URL"
+  ],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "agent-mcp-url-credential",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "agent inspect",
+    "target": "mcp.json"
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# agent-mcp-url-credential
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-MCPX-0003`
+
+## Purpose
+
+Agent mcp url credential.
+
+## Direct expected Layerfault rules
+
+- `LF-MCP-CREDENTIAL-IN-URL`
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- None
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- None
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **medium**
+- Difficulty: **hard**
+- Expected admission decision: **BLOCK**
+- Control type: **positive**
+- Attack surface: agent-mcp-static
+- Techniques: mcp, url, credential
+- Transformations: none
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MCPX-0003`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "6e3f2f3a62e347c735e4a01b8a0ca66bcfe9432bd876fdd1e22c4b417fb7d884",
+    "size": 636
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "57011625d358b0e6adce9b38578447b17d857fc87efc1e288fa3f46c7e830ce3",
+    "size": 193
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "0b700d903626d50ca98c023db26d23f5110f036b7a1a5bcf969cece3f9b13ee5",
+    "size": 869
+  },
+  {
+    "path": "README.md",
+    "sha256": "bbeab6a276ae53bb3504b04684dd82dfb2562aadd3339305b28a667710dbc9d8",
+    "size": 2160
+  },
+  {
+    "path": "mcp.json",
+    "sha256": "ef25ff78cbe3da89e6c617a0dfe14661586ddb5d6ad2db141481f659c9dab117",
+    "size": 334
+  }
+]

mcp.json

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+{
+  "mcpServers": {
+    "fixture": {
+      "auth": {
+        "audience": "layerfault-fixture",
+        "type": "synthetic"
+      },
+      "package": "@layerfault/fixture@1.2.3",
+      "scopes": [
+        "tools.read"
+      ],
+      "transport": "https",
+      "url": "https://FAKE_USER:FAKE_TOKEN@mcp.fixture.invalid/api"
+    }
+  }
+}