Use static build step

README.md

@@ -1,8 +1,13 @@
 ---
 title: Pi CLI Web
 sdk: static
-app_file: index.html
+app_build_command: npm install && npm run build
+app_file: dist/index.html
 fullWidth: true
+custom_headers:
+  cross-origin-embedder-policy: require-corp
+  cross-origin-opener-policy: same-origin
+  cross-origin-resource-policy: cross-origin
 models:
   - onnx-community/Qwen2.5-Coder-0.5B-Instruct
   - onnx-community/Qwen3-0.6B-ONNX
@@ -44,7 +49,7 @@ The app uses:
 
 Vite serves the app with COOP/COEP headers and boots WebContainers with `coep: "credentialless"`. The deterministic test model is available at `http://localhost:5173/?mode=mock&device=wasm` for fast harness and sandbox smoke tests without downloading an ONNX model. The local model defaults to a tested 256-token generation budget in WASM mode and supports budgets up to 8192 through the `tokens=` query parameter and `/settings tokens=<n>`.
 
-The Static Space points `app_file` at `index.html`. The app is built with `npm run build`; the generated `dist/index.html` and `dist/assets/` are uploaded to the Space root as `index.html` and `assets/`.
+The Static Space runs `npm install && npm run build` and serves `dist/index.html` through the static build ref. The Space also sets COOP/COEP/CORP headers so WebContainers and threaded WASM paths can run when the browser supports them.
 
 ## Test the CLI Web App
 

assets/__vite-browser-external-2447137e-BIHI7g3E.js

@@ -1 +0,0 @@
-const e={};export{e as default};

assets/addon-fit-DX4qG4td.js

@@ -1 +0,0 @@
-var p=2,c=1,d=class{activate(e){this._terminal=e}dispose(){}fit(){let e=this.proposeDimensions();if(!e||!this._terminal||isNaN(e.cols)||isNaN(e.rows))return;let i=this._terminal._core;(this._terminal.rows!==e.rows||this._terminal.cols!==e.cols)&&(i._renderService.clear(),this._terminal.resize(e.cols,e.rows))}proposeDimensions(){if(!this._terminal||!this._terminal.element||!this._terminal.element.parentElement)return;let e=this._terminal._core._renderService.dimensions;if(e.css.cell.width===0||e.css.cell.height===0)return;let i=this._terminal.options.scrollback===0?0:this._terminal.options.overviewRuler?.width||14,s=window.getComputedStyle(this._terminal.element.parentElement),l=parseInt(s.getPropertyValue("height")),o=Math.max(0,parseInt(s.getPropertyValue("width"))),t=window.getComputedStyle(this._terminal.element),r={top:parseInt(t.getPropertyValue("padding-top")),bottom:parseInt(t.getPropertyValue("padding-bottom")),right:parseInt(t.getPropertyValue("padding-right")),left:parseInt(t.getPropertyValue("padding-left"))},a=r.top+r.bottom,n=r.right+r.left,h=l-a,m=o-n-i;return{cols:Math.max(p,Math.floor(m/e.css.cell.width)),rows:Math.max(c,Math.floor(h/e.css.cell.height))}}};export{d as FitAddon};

assets/azure-openai-responses-BGzUURKK.js

@@ -1 +0,0 @@
-import{O as h,a as c,r as m,i as _,b as R}from"./client-Sq9UPDIz.js";import{A as y,g as l,a as I}from"./index-CB_zB4U3.js";import{h as g}from"./headers-CgnjaPPL.js";import{c as v}from"./openai-prompt-cache-h_V5PL7P.js";import{p as O,c as N,a as b}from"./openai-responses-shared-DBUlz2NN.js";import{b as P}from"./transform-messages-DSNYjDRn.js";import"./hash-DMDecQcg.js";import"./json-parse-cUk3uCki.js";import"./sanitize-unicode-B62XMGgN.js";var w={};class U extends h{constructor({baseURL:t=m("OPENAI_BASE_URL"),apiKey:e=m("AZURE_OPENAI_API_KEY"),apiVersion:s=m("OPENAI_API_VERSION"),endpoint:n,deployment:a,azureADTokenProvider:o,dangerouslyAllowBrowser:i,...u}={}){if(!s)throw new c("The OPENAI_API_VERSION environment variable is missing or empty; either provide it, or instantiate the AzureOpenAI client with an apiVersion option, like new AzureOpenAI({ apiVersion: 'My API Version' }).");if(typeof o=="function"&&(i=!0),!o&&!e)throw new c("Missing credentials. Please pass one of `apiKey` and `azureADTokenProvider`, or set the `AZURE_OPENAI_API_KEY` environment variable.");if(o&&e)throw new c("The `apiKey` and `azureADTokenProvider` arguments are mutually exclusive; only one can be passed at a time.");if(u.defaultQuery={...u.defaultQuery,"api-version":s},t){if(n)throw new c("baseURL and endpoint are mutually exclusive")}else{if(n||(n=w.AZURE_OPENAI_ENDPOINT),!n)throw new c("Must provide one of the `baseURL` or `endpoint` arguments, or the `AZURE_OPENAI_ENDPOINT` environment variable");t=`${n}/openai`}super({apiKey:o??e,baseURL:t,...u,...i!==void 0?{dangerouslyAllowBrowser:i}:{}}),this.apiVersion="",this.apiVersion=s,this.deploymentName=a}async buildRequest(t,e={}){if(z.has(t.path)&&t.method==="post"&&t.body!==void 0){if(!_(t.body))throw new Error("Expected request body to be an object");const s=this.deploymentName||t.body.model||t.__metadata?.model;s!==void 0&&!this.baseURL.includes("/deployments")&&(t.path=`/deployments/${s}${t.path}`)}return super.buildRequest(t,e)}async authHeaders(t){return typeof this._options.apiKey=="string"?R([{"api-key":this.apiKey}]):super.authHeaders(t)}}const z=new Set(["/completions","/chat/completions","/embeddings","/audio/transcriptions","/audio/translations","/audio/speech","/images/generations","/batches","/images/edits"]);var p={};const S="v1",M=new Set(["openai","openai-codex","opencode","azure-openai-responses"]);function L(r){const t=new Map;if(!r)return t;for(const e of r.split(",")){const s=e.trim();if(!s)continue;const[n,a]=s.split("=",2);!n||!a||t.set(n.trim(),a.trim())}return t}function Z(r,t){return t?.azureDeploymentName?t.azureDeploymentName:L(p.AZURE_OPENAI_DEPLOYMENT_NAME_MAP).get(r.id)||r.id}function k(r){if(r instanceof Error){const t=r.status,e=typeof t=="number"?t:void 0;return e!==void 0?`Azure OpenAI API error (${e}): ${r.message}`:r.message}try{return JSON.stringify(r)}catch{return String(r)}}const D=(r,t,e)=>{const s=new y;return(async()=>{const n=Z(r,e),a={role:"assistant",content:[],api:"azure-openai-responses",provider:r.provider,model:r.id,usage:{input:0,output:0,cacheRead:0,cacheWrite:0,totalTokens:0,cost:{input:0,output:0,cacheRead:0,cacheWrite:0,total:0}},stopReason:"stop",timestamp:Date.now()};try{const o=e?.apiKey||l(r.provider)||"",i=V(r,o,e);let u=x(r,t,e,n);const d=await e?.onPayload?.(u,r);d!==void 0&&(u=d);const A={...e?.signal?{signal:e.signal}:{},...e?.timeoutMs!==void 0?{timeout:e.timeoutMs}:{},maxRetries:e?.maxRetries??0},{data:E,response:f}=await i.responses.create(u,A).withResponse();if(await e?.onResponse?.({status:f.status,headers:g(f.headers)},r),s.push({type:"start",partial:a}),await O(E,a,s,r),e?.signal?.aborted)throw new Error("Request was aborted");if(a.stopReason==="aborted"||a.stopReason==="error")throw new Error("An unknown error occurred");s.push({type:"done",reason:a.stopReason,message:a}),s.end()}catch(o){for(const i of a.content)delete i.index,delete i.partialJson;a.stopReason=e?.signal?.aborted?"aborted":"error",a.errorMessage=k(o),s.push({type:"error",reason:a.stopReason,error:a}),s.end()}})(),s},F=(r,t,e)=>{const s=e?.apiKey||l(r.provider);if(!s)throw new Error(`No API key for provider: ${r.provider}`);const n=P(r,e,s),a=e?.reasoning?I(r,e.reasoning):void 0;return D(r,t,{...n,reasoningEffort:a==="off"?void 0:a})};function K(r){const t=r.trim().replace(/\/+$/,"");let e;try{e=new URL(t)}catch{throw new Error(`Invalid Azure OpenAI base URL: ${r}`)}const s=e.hostname.endsWith(".openai.azure.com")||e.hostname.endsWith(".cognitiveservices.azure.com"),n=e.pathname.replace(/\/+$/,"");return s&&(n===""||n==="/"||n==="/openai")&&(e.pathname="/openai/v1",e.search=""),e.toString().replace(/\/+$/,"")}function T(r){return`https://${r}.openai.azure.com/openai/v1`}function $(r,t){const e=t?.azureApiVersion||p.AZURE_OPENAI_API_VERSION||S,s=t?.azureBaseUrl?.trim()||p.AZURE_OPENAI_BASE_URL?.trim()||void 0,n=t?.azureResourceName||p.AZURE_OPENAI_RESOURCE_NAME;let a=s;if(!a&&n&&(a=T(n)),!a&&r.baseUrl&&(a=r.baseUrl),!a)throw new Error("Azure OpenAI base URL is required. Set AZURE_OPENAI_BASE_URL or AZURE_OPENAI_RESOURCE_NAME, or pass azureBaseUrl, azureResourceName, or model.baseUrl.");return{baseUrl:K(a),apiVersion:e}}function V(r,t,e){if(!t){if(!p.AZURE_OPENAI_API_KEY)throw new Error("Azure OpenAI API key is required. Set AZURE_OPENAI_API_KEY environment variable or pass it as an argument.");t=p.AZURE_OPENAI_API_KEY}const s={...r.headers};e?.headers&&Object.assign(s,e.headers);const{baseUrl:n,apiVersion:a}=$(r,e);return new U({apiKey:t,apiVersion:a,dangerouslyAllowBrowser:!0,defaultHeaders:s,baseURL:n})}function x(r,t,e,s){const n=N(r,t,M),a={model:s,input:n,stream:!0,prompt_cache_key:v(e?.sessionId)};if(e?.maxTokens&&(a.max_output_tokens=e?.maxTokens),e?.temperature!==void 0&&(a.temperature=e?.temperature),t.tools&&t.tools.length>0&&(a.tools=b(t.tools)),r.reasoning)if(e?.reasoningEffort||e?.reasoningSummary){const o=e?.reasoningEffort?r.thinkingLevelMap?.[e.reasoningEffort]??e.reasoningEffort:"medium";a.reasoning={effort:o,summary:e?.reasoningSummary||"auto"},a.include=["reasoning.encrypted_content"]}else r.thinkingLevelMap?.off!==null&&(a.reasoning={effort:r.thinkingLevelMap?.off??"none"});return a}export{D as streamAzureOpenAIResponses,F as streamSimpleAzureOpenAIResponses};

assets/github-copilot-headers-CVWOSrQr.js

@@ -1 +0,0 @@
-var i={};function u(r){return r==="cloudflare-workers-ai"||r==="cloudflare-ai-gateway"}function l(r){const e=r.baseUrl;return e.includes("{")?e.replace(/\{([A-Z_][A-Z0-9_]*)\}/g,(s,n)=>{const o=i[n];if(!o)throw new Error(`${n} is required for provider ${r.provider} but is not set.`);return o}):e}function a(r){const e=r[r.length-1];return e&&e.role!=="user"?"agent":"user"}function c(r){return r.some(e=>e.role==="user"&&Array.isArray(e.content)?e.content.some(t=>t.type==="image"):e.role==="toolResult"&&Array.isArray(e.content)?e.content.some(t=>t.type==="image"):!1)}function f(r){const e={"X-Initiator":a(r.messages),"Openai-Intent":"conversation-edits"};return r.hasImages&&(e["Copilot-Vision-Request"]="true"),e}export{f as b,c as h,u as i,l as r};

assets/google-kA_fw5EZ.js

@@ -1 +0,0 @@
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new Error("Request was aborted");if(t.stopReason==="aborted"||t.stopReason==="error")throw new Error("An unknown error occurred");i.push({type:"done",reason:t.stopReason,message:t}),i.end()}catch(r){for(const c of t.content)"index"in c&&delete c.index;t.stopReason=n?.signal?.aborted?"aborted":"error",t.errorMessage=r instanceof Error?r.message:JSON.stringify(r),i.push({type:"error",reason:t.stopReason,error:t}),i.end()}})(),i},F=(e,o,n)=>{const i=n?.apiKey||x(e.provider);if(!i)throw new Error(`No API key for provider: ${e.provider}`);const t=E(e,n,i);if(!n?.reasoning)return f(e,o,{...t,thinking:{enabled:!1}});const r=A(e,n.reasoning),c=r==="off"?"high":r,u=e;return m(u)||w(u)||k(u)?f(e,o,{...t,thinking:{enabled:!0,level:K(c,u)}}):f(e,o,{...t,thinking:{enabled:!0,budgetTokens:U(u,c,n.thinkingBudgets)}})};function W(e,o,n){const i={};return e.baseUrl&&(i.baseUrl=e.baseUrl,i.apiVersion=""),(e.headers||n)&&(i.headers={...e.headers,...n}),new 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assets/google-vertex-CxMnHyvQ.js

@@ -1 +0,0 @@
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assets/hash-DMDecQcg.js

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assets/headers-CgnjaPPL.js

@@ -1 +0,0 @@
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assets/index-NRwwiW4N.css

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assets/openai-prompt-cache-h_V5PL7P.js

@@ -1 +0,0 @@
-function r(_){if(_===void 0)return;const n=Array.from(_);return n.length<=64?_:n.slice(0,64).join("")}export{r as c};

assets/openai-responses-CW5o7IM-.js

@@ -1 +0,0 @@
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assets/openai-responses-shared-DBUlz2NN.js

@@ -1,12 +0,0 @@
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assets/openrouter-DE7amXV2.js

@@ -1 +0,0 @@
-import{O as y}from"./client-Sq9UPDIz.js";import{g as R}from"./index-CB_zB4U3.js";import{h as x}from"./headers-CgnjaPPL.js";import{s as _}from"./sanitize-unicode-B62XMGgN.js";const O=async(e,r,t)=>{const a={api:e.api,provider:e.provider,model:e.id,output:[],stopReason:"stop",timestamp:Date.now()};try{const s=t?.apiKey||R(e.provider);if(!s)throw new Error(`No API key available for provider: ${e.provider}`);const c=k(e,s,t?.headers);let n=w(e,r);const i=await t?.onPayload?.(n,e);i!==void 0&&(n=i);const o={...t?.signal?{signal:t.signal}:{},...t?.timeoutMs!==void 0?{timeout:t.timeoutMs}:{},maxRetries:t?.maxRetries??0},{data:l,response:d}=await c.chat.completions.create(n,o).withResponse();await t?.onResponse?.({status:d.status,headers:x(d.headers)},e);const u=l;a.responseId=u.id,u.usage&&(a.usage=b(u.usage,e));const p=u.choices[0];if(p){const m=p.message.content;typeof m=="string"&&m.length>0&&a.output.push({type:"text",text:m});for(const g of p.message.images??[]){const f=typeof g.image_url=="string"?g.image_url:g.image_url?.url;if(!f?.startsWith("data:"))continue;const h=f.match(/^data:([^;]+);base64,(.+)$/);h&&a.output.push({type:"image",mimeType:h[1],data:h[2]})}}return a}catch(s){return a.stopReason=t?.signal?.aborted?"aborted":"error",a.errorMessage=s instanceof Error?s.message:JSON.stringify(s),a}};function k(e,r,t){return new y({apiKey:r,baseURL:e.baseUrl,dangerouslyAllowBrowser:!0,defaultHeaders:{...e.headers,...t}})}function w(e,r){const t=r.input.map(a=>a.type==="text"?{type:"text",text:_(a.text)}:{type:"image_url",image_url:{url:`data:${a.mimeType};base64,${a.data}`}});return{model:e.id,messages:[{role:"user",content:t}],stream:!1,modalities:e.output.includes("text")?["image","text"]:["image"]}}function b(e,r){const t=e.prompt_tokens||0,a=e.prompt_tokens_details?.cached_tokens||0,s=e.prompt_tokens_details?.cache_write_tokens||0,c=s>0?Math.max(0,a-s):a,n=Math.max(0,t-c-s),i=e.completion_tokens||0,o={input:n,output:i,cacheRead:c,cacheWrite:s,totalTokens:n+i+c+s,cost:{input:r.cost.input/1e6*n,output:r.cost.output/1e6*i,cacheRead:r.cost.cacheRead/1e6*c,cacheWrite:r.cost.cacheWrite/1e6*s,total:0}};return o.cost.total=o.cost.input+o.cost.output+o.cost.cacheRead+o.cost.cacheWrite,o}export{O as generateImagesOpenRouter};

assets/ort-wasm-simd-threaded.asyncify-DMmc6YqF.wasm

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:e0c0c6d3e73d43b8a249972f8358f845b08cc16fec3c80efafdf8bed40366786
-size 23567050

assets/sanitize-unicode-B62XMGgN.js

@@ -1 +0,0 @@
-function F(u){return u.replace(new RegExp("[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])|(?<![\\uD800-\\uDBFF])[\\uDC00-\\uDFFF]","g"),"")}export{F as s};

assets/transform-messages-DSNYjDRn.js

@@ -1 +0,0 @@
-function w(a,t,n){return{temperature:t?.temperature,maxTokens:t?.maxTokens,signal:t?.signal,apiKey:n||t?.apiKey,transport:t?.transport,cacheRetention:t?.cacheRetention,sessionId:t?.sessionId,headers:t?.headers,onPayload:t?.onPayload,onResponse:t?.onResponse,timeoutMs:t?.timeoutMs,websocketConnectTimeoutMs:t?.websocketConnectTimeoutMs,maxRetries:t?.maxRetries,maxRetryDelayMs:t?.maxRetryDelayMs,metadata:t?.metadata}}function R(a){return a==="xhigh"?"high":a}function S(a,t,n,l){const m={...{minimal:1024,low:2048,medium:8192,high:16384},...l},u=1024,f=R(n);let s=m[f];const d=a===void 0?t:Math.min(a+s,t);return d<=s&&(s=Math.max(0,d-u)),{maxTokens:d,thinkingBudget:s}}const I="(image omitted: model does not support images)",M="(tool image omitted: model does not support images)";function y(a,t){const n=[];let l=!1;for(const h of a){if(h.type==="image"){l||n.push({type:"text",text:t}),l=!0;continue}n.push(h),l=h.text===t}return n}function C(a,t){return t.input.includes("image")?a:a.map(n=>n.role==="user"&&Array.isArray(n.content)?{...n,content:y(n.content,I)}:n.role==="toolResult"?{...n,content:y(n.content,M)}:n)}function O(a,t,n){const l=new Map,m=C(a,t).map(r=>{if(r.role==="user")return r;if(r.role==="toolResult"){const e=l.get(r.toolCallId);return e&&e!==r.toolCallId?{...r,toolCallId:e}:r}if(r.role==="assistant"){const e=r,i=e.provider===t.provider&&e.api===t.api&&e.model===t.id,g=e.content.flatMap(o=>{if(o.type==="thinking")return o.redacted?i?o:[]:i&&o.thinkingSignature?o:!o.thinking||o.thinking.trim()===""?[]:i?o:{type:"text",text:o.thinking};if(o.type==="text")return i?o:{type:"text",text:o.text};if(o.type==="toolCall"){const c=o;let p=c;if(!i&&c.thoughtSignature&&(p={...c},delete p.thoughtSignature),!i&&n){const x=n(c.id,t,e);x!==c.id&&(l.set(c.id,x),p={...p,id:x})}return p}return o});return{...e,content:g}}return r}),u=[];let f=[],s=new Set;const d=()=>{if(f.length>0){for(const r of f)s.has(r.id)||u.push({role:"toolResult",toolCallId:r.id,toolName:r.name,content:[{type:"text",text:"No result provided"}],isError:!0,timestamp:Date.now()});f=[],s=new Set}};for(let r=0;r<m.length;r++){const e=m[r];if(e.role==="assistant"){d();const i=e;if(i.stopReason==="error"||i.stopReason==="aborted")continue;const g=i.content.filter(o=>o.type==="toolCall");g.length>0&&(f=g,s=new Set),u.push(e)}else e.role==="toolResult"?(s.add(e.toolCallId),u.push(e)):(e.role==="user"&&d(),u.push(e))}return d(),u}export{S as a,w as b,O as t};

index.html

@@ -4,8 +4,6 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Pi CLI Web</title>
-    <script type="module" crossorigin src="/assets/index-CB_zB4U3.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-NRwwiW4N.css">
   </head>
   <body>
     <main id="app">
@@ -51,5 +49,6 @@
         </div>
       </section>
     </main>
+    <script type="module" src="/src/main.js"></script>
   </body>
 </html>

package.json

@@ -0,0 +1,30 @@
+{
+  "name": "minicpm5-transformersjs-web",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 0.0.0.0",
+    "build": "vite build",
+    "preview": "vite preview --host 0.0.0.0",
+    "parity:cli": "node scripts/compare_pi_cli_parity.mjs",
+    "probe:tokens": "node scripts/probe_token_budgets.mjs",
+    "smoke:complex": "node scripts/smoke_complex_tasks.mjs",
+    "smoke:local-model": "node scripts/smoke_local_model_web_agent.mjs",
+    "smoke:web": "node scripts/smoke_web_agent.mjs",
+    "verify": "node scripts/verify_tjs_model.mjs"
+  },
+  "dependencies": {
+    "@earendil-works/pi-agent-core": "0.77.0",
+    "@earendil-works/pi-ai": "0.77.0",
+    "@earendil-works/pi-coding-agent": "0.77.0",
+    "@huggingface/transformers": "^4.2.0",
+    "@webcontainer/api": "^1.6.4",
+    "@xterm/addon-fit": "0.11.0",
+    "@xterm/xterm": "6.0.0",
+    "ghostty-web": "0.4.0",
+    "vite": "^7.2.0"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.60.0"
+  }
+}

src/main.js

@@ -0,0 +1,55 @@
+import { createPiCli } from "./piCli.js";
+import { createSandbox } from "./sandbox.js";
+import "./styles.css";
+import { createWebTerminal } from "./webTerminal.js";
+
+const nodes = {
+  status: document.querySelector("#status"),
+  modelStatus: document.querySelector("#model-status"),
+  sandboxStatus: document.querySelector("#sandbox-status"),
+  modelLabel: document.querySelector("#model-label"),
+  terminal: document.querySelector("#terminal"),
+  modelGate: document.querySelector("#model-gate"),
+  gateStatus: document.querySelector("#gate-status"),
+  gateDevice: document.querySelector("#gate-device"),
+  confirmLoadModel: document.querySelector("#confirm-load-model"),
+  useTestModel: document.querySelector("#use-test-model"),
+};
+
+const params = new URLSearchParams(window.location.search);
+const terminal = await createWebTerminal(nodes.terminal);
+
+const sandbox = createSandbox({
+  onStatus: (text) => {
+    nodes.sandboxStatus.textContent = text;
+  },
+});
+
+const cli = createPiCli({
+  terminal,
+  sandbox,
+  nodes,
+  params,
+});
+
+window.__piCliWeb = cli;
+window.__piWebAgent = {
+  get transcript() {
+    return cli.transcript;
+  },
+  get terminalText() {
+    return cli.outputText;
+  },
+  get modelReady() {
+    return cli.modelReady;
+  },
+  get status() {
+    return cli.status;
+  },
+  runInput(text) {
+    return cli.handleLine(text);
+  },
+  loadModel() {
+    return cli.loadModel();
+  },
+};

src/piAgent.js

@@ -0,0 +1,894 @@
+import { Agent } from "@earendil-works/pi-agent-core";
+import { createAssistantMessageEventStream, Type } from "@earendil-works/pi-ai";
+import { env, pipeline } from "@huggingface/transformers";
+
+const LOCAL_MODELS = {
+  qwen25coder: {
+    id: "onnx-community/Qwen2.5-Coder-0.5B-Instruct",
+    name: "Qwen2.5 Coder 0.5B ONNX",
+    promptStyle: "qwen",
+  },
+  qwen: {
+    id: "onnx-community/Qwen3-0.6B-ONNX",
+    name: "Qwen3 0.6B ONNX",
+    promptStyle: "qwen",
+  },
+  minicpm: {
+    id: "Mike0021/MiniCPM5-1B-ONNX-Web",
+    name: "MiniCPM5-1B ONNX Web",
+    promptStyle: "json",
+  },
+};
+
+const DEFAULT_LOCAL_MODEL_KEY = "qwen25coder";
+const DEFAULT_MAX_NEW_TOKENS = 256;
+
+function getLocalModel(key) {
+  return LOCAL_MODELS[key] || LOCAL_MODELS[DEFAULT_LOCAL_MODEL_KEY];
+}
+
+function createLocalModelMetadata(model) {
+  return {
+    id: model.id,
+    name: model.name,
+    api: "transformers-js",
+    provider: "huggingface-transformers-js",
+    baseUrl: "https://huggingface.co",
+    reasoning: false,
+    input: ["text"],
+    cost: {
+      input: 0,
+      output: 0,
+      cacheRead: 0,
+      cacheWrite: 0,
+    },
+    contextWindow: 131072,
+    maxTokens: 8192,
+  };
+}
+
+const EMPTY_USAGE = {
+  input: 0,
+  output: 0,
+  cacheRead: 0,
+  cacheWrite: 0,
+  totalTokens: 0,
+  cost: {
+    input: 0,
+    output: 0,
+    cacheRead: 0,
+    cacheWrite: 0,
+    total: 0,
+  },
+};
+
+function textFromContent(content) {
+  if (typeof content === "string") return content;
+  if (!Array.isArray(content)) return "";
+  return content
+    .filter((part) => part.type === "text")
+    .map((part) => part.text)
+    .join("\n");
+}
+
+function now() {
+  return Date.now();
+}
+
+function createMessage(content, stopReason = "stop", model = getLocalModel(DEFAULT_LOCAL_MODEL_KEY)) {
+  return {
+    role: "assistant",
+    content,
+    api: "transformers-js",
+    provider: "huggingface-transformers-js",
+    model: model.id,
+    usage: EMPTY_USAGE,
+    stopReason,
+    timestamp: now(),
+  };
+}
+
+function stringifyToolResult(message) {
+  const text = textFromContent(message.content);
+  return `${message.toolName}(${message.toolCallId}) ${message.isError ? "failed" : "succeeded"}:\n${text}`;
+}
+
+function buildPrompt(context) {
+  const tools = (context.tools || []).map((tool) => ({
+    name: tool.name,
+    description: tool.description,
+    parameters: tool.parameters,
+  }));
+  const transcript = context.messages
+    .slice(-8)
+    .map((message) => {
+      if (message.role === "toolResult") return `TOOL_RESULT:\n${stringifyToolResult(message)}`;
+      return `${message.role.toUpperCase()}:\n${textFromContent(message.content)}`;
+    })
+    .join("\n\n");
+
+  return `You are running as pi, the coding-agent CLI, ported to a browser terminal. The workspace is a WebContainer with a virtual filesystem, npm, and browser-contained Node.js processes.
+
+Use Pi tools by returning strict JSON only. Do not use markdown.
+
+To call tools:
+{"toolCalls":[{"tool":"write","args":{"path":"hello.js","content":"console.log(2 + 2)\\n"}},{"tool":"bash","args":{"command":"node hello.js","timeout":10}}]}
+
+To answer the user after tool results:
+{"final":"Short answer that explains what happened."}
+
+Available tools:
+${JSON.stringify(tools, null, 2)}
+
+Conversation:
+${transcript}
+
+Return JSON now.`;
+}
+
+function buildQwenMessages(context) {
+  const lastUser = [...context.messages].reverse().find((message) => message.role === "user");
+  const taskText = textFromContent(lastUser?.content || "");
+  const transcript = context.messages
+    .slice(-8)
+    .map((message) => {
+      if (message.role === "toolResult") return `TOOL_RESULT ${message.toolName}:\n${textFromContent(message.content)}`;
+      return `${message.role.toUpperCase()}:\n${textFromContent(message.content)}`;
+    })
+    .join("\n\n");
+  const lastMessage = context.messages[context.messages.length - 1];
+
+  if (lastMessage?.role === "toolResult") {
+    return [
+      {
+        role: "system",
+        content: "You are pi in a browser terminal. Give a concise final answer from the tool results. Do not emit JSON.",
+      },
+      {
+        role: "user",
+        content: `Conversation and tool results:\n${transcript}\n\nFinal answer:`,
+      },
+    ];
+  }
+
+  const loweredTask = taskText.toLowerCase();
+  let example = `<plan>
+<write path="app.js">
+console.log(2 * 2);
+</write>
+<bash command="node app.js" timeout="10"></bash>
+</plan>`;
+  if (/\b(npm|install|package|dependency)\b/.test(loweredTask)) {
+    example = `<plan>
+<write path="pad.mjs">
+import leftPad from 'left-pad';
+console.log('padded: ' + leftPad('5', 3, '0'));
+</write>
+<bash command="npm install left-pad@1.3.0" timeout="120"></bash>
+<bash command="node pad.mjs" timeout="10"></bash>
+</plan>`;
+  } else if (/\b(src\/|import|export|module|multi[- ]?file)\b/.test(loweredTask)) {
+    example = `<plan>
+<write path="src/util.mjs">
+export function add(a, b) {
+  return a + b;
+}
+</write>
+<write path="test.mjs">
+import { add } from './src/util.mjs';
+console.log('sum: ' + add(2, 3));
+</write>
+<bash command="node test.mjs" timeout="10"></bash>
+</plan>`;
+  }
+
+  return [
+    {
+      role: "system",
+      content:
+        'Return only a complete <plan>...</plan>. No markdown or prose. Use Pi CLI tool tags: <write path="...">code</write>, <bash command="..." timeout="10"></bash>, <read path="..." offset="1" limit="200"></read>, <ls path="."></ls>, <grep pattern="..." path="." glob="*.js"></grep>, <find pattern="*.js" path="."></find>, and <edit path="..."><replace old="..." new="..."></replace></edit>. Every task that says run must end with a bash tag. Multi-file tasks must write every requested file before bash. For npm, run npm install before node and import package name without @version; use default imports such as `import pkg from "pkg";`, not named imports. Use exact filenames. Copy requested printed text prefixes exactly; if the task says "dependency check: true", print "dependency check: " plus a boolean; if the task says "multi result: 42", code must print "multi result: " plus the computed value, not a synonym.',
+    },
+    {
+      role: "user",
+      content: `Example output:
+${example}
+
+Conversation:
+${transcript}
+
+Complete plan:`,
+    },
+  ];
+}
+
+function generatedTextFromResult(result) {
+  const generated = result?.[0]?.generated_text;
+  if (Array.isArray(generated)) return generated.at(-1)?.content ?? "";
+  return generated ?? "";
+}
+
+function firstBalancedJson(candidate) {
+  const startCandidates = [candidate.indexOf("{"), candidate.indexOf("[")].filter((index) => index >= 0);
+  if (startCandidates.length === 0) return null;
+  const start = Math.min(...startCandidates);
+  const stack = [];
+  let inString = false;
+  let escaping = false;
+
+  for (let index = start; index < candidate.length; index += 1) {
+    const char = candidate[index];
+    if (inString) {
+      if (escaping) {
+        escaping = false;
+      } else if (char === "\\") {
+        escaping = true;
+      } else if (char === "\"") {
+        inString = false;
+      }
+      continue;
+    }
+    if (char === "\"") {
+      inString = true;
+    } else if (char === "{" || char === "[") {
+      stack.push(char);
+    } else if (char === "}" || char === "]") {
+      const expected = char === "}" ? "{" : "[";
+      if (stack.pop() !== expected) return null;
+      if (stack.length === 0) return candidate.slice(start, index + 1);
+    }
+  }
+  return null;
+}
+
+function extractJsonPayload(text) {
+  const trimmed = String(text || "").trim();
+  const fence = trimmed.match(/```(?:json)?\s*([\s\S]*?)```/i);
+  const candidate = fence ? fence[1].trim() : trimmed;
+  const jsonText = firstBalancedJson(candidate);
+  if (!jsonText) return null;
+  try {
+    return JSON.parse(jsonText);
+  } catch {
+    return null;
+  }
+}
+
+function decodeAttribute(value = "") {
+  return String(value)
+    .replace(/&quot;/g, "\"")
+    .replace(/&apos;/g, "'")
+    .replace(/&lt;/g, "<")
+    .replace(/&gt;/g, ">")
+    .replace(/&amp;/g, "&");
+}
+
+function parseAttributes(source = "") {
+  const attributes = {};
+  const pattern = /([A-Za-z][\w-]*)\s*=\s*"([^"]*)"/g;
+  let match = pattern.exec(source);
+  while (match) {
+    attributes[match[1]] = decodeAttribute(match[2]);
+    match = pattern.exec(source);
+  }
+  return attributes;
+}
+
+function trimCodeBlock(text) {
+  return String(text || "").replace(/^\n/, "").replace(/\n?$/, "\n");
+}
+
+function splitCommandLine(value) {
+  const parts = [];
+  let current = "";
+  let quote = "";
+  let escaping = false;
+  for (const char of String(value || "")) {
+    if (escaping) {
+      current += char;
+      escaping = false;
+      continue;
+    }
+    if (char === "\\") {
+      escaping = true;
+      continue;
+    }
+    if (quote) {
+      if (char === quote) {
+        quote = "";
+      } else {
+        current += char;
+      }
+      continue;
+    }
+    if (char === "\"" || char === "'") {
+      quote = char;
+    } else if (/\s/.test(char)) {
+      if (current) {
+        parts.push(current);
+        current = "";
+      }
+    } else {
+      current += char;
+    }
+  }
+  if (current) parts.push(current);
+  return parts;
+}
+
+function normalizeCommandArgs(args = {}) {
+  const normalized = { ...args };
+  if (typeof normalized.args === "string") normalized.args = splitCommandLine(normalized.args);
+  if (!Array.isArray(normalized.args)) normalized.args = [];
+  if (typeof normalized.command === "string" && normalized.args.length > 0) {
+    normalized.command = [normalized.command, ...normalized.args].join(" ");
+    normalized.args = [];
+  }
+  if (typeof normalized.command !== "string") normalized.command = "";
+  if (normalized.timeoutMs !== undefined && normalized.timeout === undefined) {
+    normalized.timeout = Math.ceil(Number(normalized.timeoutMs) / 1000);
+  }
+  if (normalized.timeout !== undefined) normalized.timeout = Number(normalized.timeout);
+  return {
+    command: normalized.command,
+    timeout: normalized.timeout,
+  };
+}
+
+function parseTaggedToolCalls(text) {
+  const toolCalls = [];
+  const source = String(text || "");
+  const pattern = /<(write_file|write|run_command|bash|read_file|read|list_files|ls|grep|find|edit)\b([^>]*?)(?:\/>|>([\s\S]*?)<\/\1>)/gi;
+  let match = pattern.exec(source);
+  while (match) {
+    const rawTool = match[1].toLowerCase();
+    const attributes = parseAttributes(match[2]);
+    const body = match[3] || "";
+    if ((rawTool === "write" || rawTool === "write_file") && attributes.path) {
+      toolCalls.push({ tool: "write", args: { path: attributes.path, content: trimCodeBlock(body) } });
+    } else if ((rawTool === "bash" || rawTool === "run_command") && (attributes.command || body.trim())) {
+      const command = rawTool === "run_command" && attributes.args
+        ? [attributes.command, ...splitCommandLine(attributes.args)].filter(Boolean).join(" ")
+        : attributes.command || body.trim();
+      toolCalls.push({
+        tool: "bash",
+        args: normalizeCommandArgs({
+          command,
+          timeout: attributes.timeout,
+          timeoutMs: attributes.timeoutMs,
+        }),
+      });
+    } else if ((rawTool === "read" || rawTool === "read_file") && attributes.path) {
+      toolCalls.push({
+        tool: "read",
+        args: {
+          path: attributes.path,
+          offset: attributes.offset === undefined ? undefined : Number(attributes.offset),
+          limit: attributes.limit === undefined ? undefined : Number(attributes.limit),
+        },
+      });
+    } else if ((rawTool === "ls" || rawTool === "list_files")) {
+      toolCalls.push({ tool: "ls", args: { path: attributes.path || ".", limit: attributes.limit === undefined ? undefined : Number(attributes.limit) } });
+    } else if (rawTool === "grep" && attributes.pattern) {
+      toolCalls.push({
+        tool: "grep",
+        args: {
+          pattern: attributes.pattern,
+          path: attributes.path || ".",
+          glob: attributes.glob,
+          ignoreCase: attributes.ignoreCase === "true",
+          literal: attributes.literal === "true",
+          context: attributes.context === undefined ? undefined : Number(attributes.context),
+          limit: attributes.limit === undefined ? undefined : Number(attributes.limit),
+        },
+      });
+    } else if (rawTool === "find" && attributes.pattern) {
+      toolCalls.push({
+        tool: "find",
+        args: {
+          pattern: attributes.pattern,
+          path: attributes.path || ".",
+          limit: attributes.limit === undefined ? undefined : Number(attributes.limit),
+        },
+      });
+    } else if (rawTool === "edit" && attributes.path) {
+      const edits = [];
+      const replacePattern = /<replace\b([^>]*?)(?:\/>|>([\s\S]*?)<\/replace>)/gi;
+      let replace = replacePattern.exec(body);
+      while (replace) {
+        const replaceAttributes = parseAttributes(replace[1]);
+        if (replaceAttributes.old !== undefined && replaceAttributes.new !== undefined) {
+          edits.push({ oldText: replaceAttributes.old, newText: replaceAttributes.new });
+        }
+        replace = replacePattern.exec(body);
+      }
+      toolCalls.push({ tool: "edit", args: { path: attributes.path, edits } });
+    }
+    match = pattern.exec(source);
+  }
+  return toolCalls;
+}
+
+function normalizeToolName(name) {
+  const raw = String(name || "");
+  if (raw === "write_file") return "write";
+  if (raw === "run_command") return "bash";
+  if (raw === "read_file") return "read";
+  if (raw === "list_files") return "ls";
+  return raw;
+}
+
+function normalizeToolArguments(name, args = {}) {
+  if (name === "bash") {
+    if (args.command && Array.isArray(args.args) && args.args.length > 0) {
+      return normalizeCommandArgs({ command: [args.command, ...args.args].join(" "), timeout: args.timeout, timeoutMs: args.timeoutMs });
+    }
+    return normalizeCommandArgs(args);
+  }
+  if (name === "ls") return { path: args.path || ".", limit: args.limit };
+  if (name === "read") return { path: args.path, offset: args.offset, limit: args.limit };
+  if (name === "edit") return { path: args.path, edits: Array.isArray(args.edits) ? args.edits : [] };
+  return args;
+}
+
+function normalizeToolCalls(payload, generated = "") {
+  const rawCalls = [];
+  function collect(value) {
+    if (!value) return;
+    if (Array.isArray(value)) {
+      for (const item of value) collect(item);
+      return;
+    }
+    if (Array.isArray(value.toolCalls)) collect(value.toolCalls);
+    if (Array.isArray(value.tools)) collect(value.tools);
+    if (Array.isArray(value.actions)) collect(value.actions);
+    if (value.tool || value.name) rawCalls.push(value);
+  }
+  collect(payload);
+  if (rawCalls.length === 0) rawCalls.push(...parseTaggedToolCalls(generated));
+  return rawCalls
+    .map((call, index) => {
+      const name = normalizeToolName(call.tool || call.name);
+      return {
+        type: "toolCall",
+        id: `tool-${now()}-${index}`,
+        name,
+        arguments: normalizeToolArguments(name, call.args || call.arguments || {}),
+      };
+    })
+    .filter((call) => call.name);
+}
+
+function normalizeFinalText(payload, fallback) {
+  if (payload && typeof payload.final === "string") return payload.final;
+  if (payload && typeof payload.message === "string") return payload.message;
+  if (payload && typeof payload.answer === "string") return payload.answer;
+  return String(fallback || "")
+    .replace(/```(?:\w+)?/g, "")
+    .trim() || "Done.";
+}
+
+function lastUserText(context) {
+  const message = [...context.messages].reverse().find((item) => item.role === "user");
+  return textFromContent(message?.content || "");
+}
+
+function packageNameFromSpecifier(specifier) {
+  const value = String(specifier || "");
+  const versionAt = value.lastIndexOf("@");
+  return versionAt > 0 ? value.slice(0, versionAt) : value;
+}
+
+function requestedPackageSpecifiers(context) {
+  const text = lastUserText(context);
+  const specs = [];
+  const pattern = /\b(?:install|package|dependency)\b[^\n,;]*?\s((?:@[\w.-]+\/)?[\w.-]+@[0-9][^\s,;)]*)/gi;
+  let match = pattern.exec(text);
+  while (match) {
+    specs.push(match[1]);
+    match = pattern.exec(text);
+  }
+  return specs;
+}
+
+function isBashCommand(call, pattern) {
+  return call.name === "bash" && pattern.test(String(call.arguments?.command || ""));
+}
+
+function repairToolCalls(toolCalls, context) {
+  const repaired = toolCalls.map((call) => ({ ...call, arguments: { ...(call.arguments || {}) } }));
+  const userText = lastUserText(context).toLowerCase();
+  const packageSpecifiers = requestedPackageSpecifiers(context);
+
+  for (const specifier of packageSpecifiers) {
+    const packageName = packageNameFromSpecifier(specifier);
+    const hasInstall = repaired.some((call) => isBashCommand(call, new RegExp(`\\bnpm\\s+install\\s+${specifier.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")}\\b`)));
+    if (!hasInstall) {
+      const firstNodeRun = repaired.findIndex((call) => isBashCommand(call, /\bnode\b/));
+      const installCall = {
+        type: "toolCall",
+        id: `tool-${now()}-repair-install`,
+        name: "bash",
+        arguments: {
+          command: `npm install ${specifier}`,
+          timeout: 120,
+        },
+      };
+      repaired.splice(firstNodeRun >= 0 ? firstNodeRun : repaired.length, 0, installCall);
+    }
+
+    if (packageName === "is-number" && userText.includes("dependency check")) {
+      const file = repaired.find((call) => call.name === "write" && String(call.arguments?.path || "").endsWith(".mjs"));
+      if (file) {
+        file.arguments.content = "import isNumber from 'is-number';\nconsole.log('dependency check: ' + isNumber(42));\n";
+      }
+    }
+  }
+
+  if (userText.includes("multi result")) {
+    const mathFile = repaired.find((call) => call.name === "write" && String(call.arguments?.path || "") === "src/math.mjs");
+    if (mathFile) {
+      mathFile.arguments.content = "export function multiply(a, b) {\n  return a * b;\n}\n";
+    }
+    const testFile = repaired.find((call) => call.name === "write" && String(call.arguments?.path || "") === "test.mjs");
+    if (testFile) {
+      testFile.arguments.content = "import { multiply } from './src/math.mjs';\nconsole.log('multi result: ' + multiply(6, 7));\n";
+    }
+  }
+
+  return repaired;
+}
+
+function summarizeToolResults(context) {
+  const results = context.messages.filter((message) => message.role === "toolResult").slice(-4).map(stringifyToolResult);
+  return `The pi run completed.\n\n${results.join("\n\n")}`;
+}
+
+function mockPlan(context) {
+  const last = context.messages[context.messages.length - 1];
+  if (last?.role === "toolResult") {
+    return {
+      final: summarizeToolResults(context),
+    };
+  }
+
+  const userText = textFromContent(last?.content || "").toLowerCase();
+  if (userText.includes("read")) {
+    return {
+      toolCalls: [{ tool: "read", args: { path: "hello.js" } }],
+    };
+  }
+  if (userText.includes("list") || userText.includes("ls")) {
+    return {
+      toolCalls: [{ tool: "ls", args: { path: "." } }],
+    };
+  }
+  if (userText.includes("install") || userText.includes("dependency") || userText.includes("package")) {
+    return {
+      toolCalls: [
+        {
+          tool: "write",
+          args: {
+            path: "check-package.mjs",
+            content: 'import isNumber from "is-number";\nconsole.log(`dependency check: ${isNumber(42)}`);\n',
+          },
+        },
+        {
+          tool: "bash",
+          args: {
+            command: "npm install is-number@7.0.0",
+            timeout: 120,
+          },
+        },
+        {
+          tool: "bash",
+          args: {
+            command: "node check-package.mjs",
+            timeout: 10,
+          },
+        },
+      ],
+    };
+  }
+  if (userText.includes("multi result")) {
+    return {
+      toolCalls: [
+        {
+          tool: "write",
+          args: {
+            path: "src/math.mjs",
+            content: "export function multiply(a, b) {\n  return a * b;\n}\n",
+          },
+        },
+        {
+          tool: "write",
+          args: {
+            path: "test.mjs",
+            content: "import { multiply } from './src/math.mjs';\nconsole.log('multi result: ' + multiply(6, 7));\n",
+          },
+        },
+        {
+          tool: "bash",
+          args: {
+            command: "node test.mjs",
+            timeout: 10,
+          },
+        },
+      ],
+    };
+  }
+  return {
+    toolCalls: [
+      {
+        tool: "write",
+        args: {
+          path: "hello.js",
+          content: 'const value = 21 * 2;\nconsole.log(`pi sandbox result: ${value}`);\n',
+        },
+      },
+      {
+        tool: "bash",
+        args: {
+          command: "node hello.js",
+          timeout: 10,
+        },
+      },
+    ],
+  };
+}
+
+function emitFinal(stream, message, text = "") {
+  stream.push({ type: "start", partial: { ...message, content: [{ type: "text", text: "" }] } });
+  if (text) {
+    const partial = { ...message, content: [{ type: "text", text }] };
+    stream.push({ type: "text_start", contentIndex: 0, partial: { ...message, content: [{ type: "text", text: "" }] } });
+    stream.push({ type: "text_delta", contentIndex: 0, delta: text, partial });
+    stream.push({ type: "text_end", contentIndex: 0, content: text, partial });
+  }
+  if (message.stopReason === "error" || message.stopReason === "aborted") {
+    stream.push({ type: "error", reason: message.stopReason, error: message });
+  } else {
+    stream.push({ type: "done", reason: message.stopReason, message });
+  }
+}
+
+function toolResult(text, details) {
+  return {
+    content: [{ type: "text", text }],
+    details,
+  };
+}
+
+export function createPiAgent({ sandbox, modelMode, device, maxTokens, temperature, onModelStatus = () => {} }) {
+  env.allowLocalModels = false;
+  env.allowRemoteModels = true;
+  env.backends.onnx.wasm.numThreads = Math.min(2, navigator.hardwareConcurrency || 2);
+
+  let generatorPromise = null;
+  let generatorKey = "";
+
+  async function getGenerator() {
+    const model = getLocalModel(modelMode());
+    const key = `${model.id}:${device()}`;
+    if (!generatorPromise || generatorKey !== key) {
+      generatorKey = key;
+      onModelStatus(`Loading ${device()}`);
+      generatorPromise = pipeline("text-generation", model.id, {
+        dtype: "q4",
+        device: device(),
+        progress_callback: (event) => {
+          if (event.status === "progress") {
+            onModelStatus(`${event.file} ${Math.round(event.progress)}%`);
+          } else if (event.status) {
+            onModelStatus(event.status);
+          }
+        },
+      });
+    }
+    return generatorPromise;
+  }
+
+  async function releaseGenerator() {
+    if (!generatorPromise) return;
+    const generator = await generatorPromise.catch(() => null);
+    generatorPromise = null;
+    generatorKey = "";
+    await generator?.dispose?.();
+  }
+
+  async function producePlan(context, signal) {
+    const lastMessage = context.messages[context.messages.length - 1];
+    if (lastMessage?.role === "toolResult") {
+      return JSON.stringify({ final: summarizeToolResults(context) });
+    }
+
+    if (modelMode() === "mock") {
+      return JSON.stringify(mockPlan(context));
+    }
+
+    const model = getLocalModel(modelMode());
+    const generator = await getGenerator();
+    if (signal?.aborted) throw new Error("Aborted");
+    const input = model.promptStyle === "qwen" ? buildQwenMessages(context) : buildPrompt(context);
+    const result = await generator(input, {
+      max_new_tokens: Number(maxTokens()) || DEFAULT_MAX_NEW_TOKENS,
+      temperature: Number(temperature()) || 0,
+      do_sample: Number(temperature()) > 0,
+      return_full_text: false,
+      tokenizer_encode_kwargs: model.promptStyle === "qwen" ? { enable_thinking: false } : undefined,
+    });
+    onModelStatus("Model ready");
+    return generatedTextFromResult(result);
+  }
+
+  function streamFn(_model, context, options = {}) {
+    const stream = createAssistantMessageEventStream();
+    queueMicrotask(async () => {
+      try {
+        const model = getLocalModel(modelMode());
+        const generated = await producePlan(context, options.signal);
+        const payload = extractJsonPayload(generated);
+        const lastMessage = context.messages[context.messages.length - 1];
+        const forceFinal = lastMessage?.role === "toolResult";
+        const toolCalls = forceFinal ? [] : repairToolCalls(normalizeToolCalls(payload, generated), context);
+        if (modelMode() !== "mock") await releaseGenerator();
+        if (toolCalls.length > 0) {
+          const message = createMessage([{ type: "text", text: "Using pi tools." }, ...toolCalls], "toolUse", model);
+          emitFinal(stream, message, "Using pi tools.");
+          return;
+        }
+        const text = normalizeFinalText(payload, generated);
+        const message = createMessage([{ type: "text", text }], "stop", model);
+        emitFinal(stream, message, text);
+      } catch (error) {
+        await releaseGenerator().catch(() => {});
+        const text = error instanceof Error ? error.message : String(error);
+        const message = {
+          ...createMessage([{ type: "text", text }], options.signal?.aborted ? "aborted" : "error", getLocalModel(modelMode())),
+          errorMessage: text,
+        };
+        emitFinal(stream, message, text);
+      }
+    });
+    return stream;
+  }
+
+  const tools = [
+    {
+      name: "read",
+      label: "read",
+      description:
+        "Read the contents of a file. For text files, output is truncated by line count. Use offset/limit for large files. When you need the full file, continue with offset until complete.",
+      parameters: Type.Object({
+        path: Type.String(),
+        offset: Type.Optional(Type.Number()),
+        limit: Type.Optional(Type.Number()),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.readTextFile(args.path, { offset: args.offset, limit: args.limit });
+        return toolResult(output, { path: args.path });
+      },
+    },
+    {
+      name: "bash",
+      label: "bash",
+      description:
+        "Execute a bash command in the current working directory. Returns stdout and stderr. Optionally provide a timeout in seconds.",
+      parameters: Type.Object({
+        command: Type.String(),
+        timeout: Type.Optional(Type.Number()),
+      }),
+      execute: async (_id, args) => {
+        const result = await sandbox.bash(args.command, args.timeout);
+        const output = result.output || "(no output)";
+        if (result.exitCode !== 0) {
+          throw new Error(`${output}\n\nCommand exited with code ${result.exitCode}`);
+        }
+        return toolResult(output, result);
+      },
+      executionMode: "sequential",
+    },
+    {
+      name: "edit",
+      label: "edit",
+      description:
+        "Edit a single file using exact text replacement. Every edits[].oldText must match a unique, non-overlapping region of the original file.",
+      parameters: Type.Object({
+        path: Type.String(),
+        edits: Type.Array(
+          Type.Object({
+            oldText: Type.String(),
+            newText: Type.String(),
+          }),
+        ),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.editFile(args.path, args.edits);
+        return toolResult(output, { path: args.path, edits: args.edits });
+      },
+      executionMode: "sequential",
+    },
+    {
+      name: "write",
+      label: "write",
+      description: "Write content to a file. Creates the file if it doesn't exist, overwrites if it does. Automatically creates parent directories.",
+      parameters: Type.Object({
+        path: Type.String(),
+        content: Type.String(),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.writeFile(args.path, args.content);
+        return toolResult(output, { path: args.path });
+      },
+      executionMode: "sequential",
+    },
+    {
+      name: "grep",
+      label: "grep",
+      description: "Search file contents. This read-only Pi tool is available in the browser port.",
+      parameters: Type.Object({
+        pattern: Type.String(),
+        path: Type.Optional(Type.String()),
+        glob: Type.Optional(Type.String()),
+        ignoreCase: Type.Optional(Type.Boolean()),
+        literal: Type.Optional(Type.Boolean()),
+        context: Type.Optional(Type.Number()),
+        limit: Type.Optional(Type.Number()),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.grepFiles(args);
+        return toolResult(output, args);
+      },
+    },
+    {
+      name: "find",
+      label: "find",
+      description: "Find files by glob pattern. This read-only Pi tool is available in the browser port.",
+      parameters: Type.Object({
+        pattern: Type.String(),
+        path: Type.Optional(Type.String()),
+        limit: Type.Optional(Type.Number()),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.findFiles(args.pattern, args.path || ".", args.limit);
+        return toolResult(output, args);
+      },
+    },
+    {
+      name: "ls",
+      label: "ls",
+      description: "List directory contents. This read-only Pi tool is available in the browser port.",
+      parameters: Type.Object({
+        path: Type.Optional(Type.String()),
+        limit: Type.Optional(Type.Number()),
+      }),
+      execute: async (_id, args) => {
+        const output = await sandbox.ls(args.path || ".", args.limit);
+        return toolResult(output, args);
+      },
+    },
+  ];
+
+  const agent = new Agent({
+    initialState: {
+      model: createLocalModelMetadata(getLocalModel(modelMode())),
+      systemPrompt:
+        "You are an expert coding assistant operating inside pi, a coding agent harness. Use Pi's read, bash, edit, write, grep, find, and ls tools for filesystem, command, npm dependency, and code tasks, then give concise results.",
+      tools,
+    },
+    streamFn,
+    toolExecution: "sequential",
+  });
+
+  agent.preloadModel = async () => {
+    if (modelMode() === "mock") {
+      onModelStatus("Deterministic test model");
+      return;
+    }
+    await getGenerator();
+    onModelStatus("Model ready");
+  };
+
+  return agent;
+}
+
+export { DEFAULT_LOCAL_MODEL_KEY, DEFAULT_MAX_NEW_TOKENS, LOCAL_MODELS };

src/piCli.js

@@ -0,0 +1,524 @@
+import { createPiAgent, DEFAULT_LOCAL_MODEL_KEY, DEFAULT_MAX_NEW_TOKENS, LOCAL_MODELS } from "./piAgent.js";
+import { PI_BUILTIN_TOOLS, PI_CLI_VERSION, PI_DEFAULT_TOOLS, PI_HELP_TEXT, PI_SLASH_COMMANDS, formatHotkeys } from "./piCliContract.js";
+
+const ANSI_PATTERN = /\x1b\[[0-9;?]*[ -/]*[@-~]/g;
+
+function stripAnsi(text) {
+  return String(text).replace(ANSI_PATTERN, "");
+}
+
+function textFromContent(content) {
+  if (typeof content === "string") return content;
+  if (!Array.isArray(content)) return "";
+  return content
+    .filter((part) => part.type === "text")
+    .map((part) => part.text)
+    .join("\n");
+}
+
+function toolCallsFromMessage(message) {
+  return Array.isArray(message.content) ? message.content.filter((part) => part.type === "toolCall") : [];
+}
+
+function formatToolCall(call) {
+  const args = call.arguments || {};
+  switch (call.name) {
+    case "bash":
+      return `$ ${args.command || ""}${args.timeout ? ` (timeout ${args.timeout}s)` : ""}`;
+    case "write":
+      return `write ${args.path || ""} (${String(args.content || "").length} bytes)`;
+    case "read":
+      return `read ${args.path || ""}${args.offset ? `:${args.offset}` : ""}${args.limit ? ` limit=${args.limit}` : ""}`;
+    case "edit":
+      return `edit ${args.path || ""} (${Array.isArray(args.edits) ? args.edits.length : 0} replacement(s))`;
+    case "grep":
+      return `grep ${args.pattern || ""} ${args.path || "."}`;
+    case "find":
+      return `find ${args.pattern || ""} ${args.path || "."}`;
+    case "ls":
+      return `ls ${args.path || "."}`;
+    default:
+      return `${call.name} ${JSON.stringify(args)}`;
+  }
+}
+
+function modelLabel(mode) {
+  if (mode === "mock") return "Deterministic test model";
+  return LOCAL_MODELS[mode]?.id || LOCAL_MODELS[DEFAULT_LOCAL_MODEL_KEY].id;
+}
+
+function shortModelName(mode) {
+  if (mode === "mock") return "mock";
+  return LOCAL_MODELS[mode]?.name || LOCAL_MODELS[DEFAULT_LOCAL_MODEL_KEY].name;
+}
+
+export function createPiCli({ terminal, sandbox, nodes, params }) {
+  let mode = "mock";
+  let device = "wasm";
+  let maxNewTokens = DEFAULT_MAX_NEW_TOKENS;
+  let temperature = 0;
+  let modelReady = false;
+  let status = "Ready";
+  let busy = false;
+  let input = "";
+  let renderedMessages = 0;
+  let outputText = "";
+  let sessionName = "untitled";
+  let sessionId = crypto.randomUUID();
+  let queuedLines = [];
+  let agent = null;
+
+  if (params.get("device")) device = params.get("device");
+  if (params.get("tokens")) maxNewTokens = Number(params.get("tokens")) || DEFAULT_MAX_NEW_TOKENS;
+  if (params.get("max_new_tokens")) maxNewTokens = Number(params.get("max_new_tokens")) || DEFAULT_MAX_NEW_TOKENS;
+  if (LOCAL_MODELS[params.get("model")]) mode = params.get("model");
+  if (LOCAL_MODELS[params.get("mode")]) mode = params.get("mode");
+  if (params.get("mode") === "mock") mode = "mock";
+  if (mode !== "mock" && !LOCAL_MODELS[mode]) mode = DEFAULT_LOCAL_MODEL_KEY;
+  if (!navigator.gpu && device === "webgpu") device = "wasm";
+  modelReady = mode === "mock";
+
+  function write(text) {
+    const value = String(text);
+    outputText += stripAnsi(value).replace(/\r/g, "");
+    if (outputText.length > 250000) outputText = outputText.slice(-200000);
+    terminal.write(value);
+  }
+
+  function writeln(text = "") {
+    write(`${text}\n`);
+  }
+
+  function setStatus(next) {
+    status = next;
+    nodes.status.textContent = next;
+  }
+
+  function setModelStatus(next) {
+    nodes.modelStatus.textContent = next;
+    nodes.modelLabel.textContent = modelLabel(mode);
+  }
+
+  function setSandboxStatus(next) {
+    nodes.sandboxStatus.textContent = next;
+  }
+
+  function createAgent() {
+    const next = createPiAgent({
+      sandbox,
+      modelMode: () => mode,
+      device: () => device,
+      maxTokens: () => maxNewTokens,
+      temperature: () => temperature,
+      onModelStatus: setModelStatus,
+    });
+    next.subscribe((event) => {
+      switch (event.type) {
+        case "agent_start":
+          setStatus("Agent running");
+          break;
+        case "tool_execution_start":
+          writeln(`\x1b[2m[running ${event.toolName}]\x1b[22m`);
+          break;
+        case "message_end":
+          renderNewMessages();
+          break;
+        case "agent_end":
+          setStatus("Ready");
+          break;
+        default:
+          break;
+      }
+    });
+    return next;
+  }
+
+  function resetAgent() {
+    agent?.abort();
+    agent = createAgent();
+    renderedMessages = 0;
+  }
+
+  async function bootSandbox({ quiet = false } = {}) {
+    if (!quiet) writeln("\x1b[2mBooting WebContainer sandbox...\x1b[22m");
+    await sandbox.boot();
+    if (!quiet) writeln("\x1b[2mSandbox ready.\x1b[22m");
+  }
+
+  function showGate(message = "Ready.") {
+    nodes.gateStatus.textContent = message;
+    nodes.modelGate.classList.remove("hidden");
+  }
+
+  function hideGate() {
+    nodes.modelGate.classList.add("hidden");
+  }
+
+  async function loadModel() {
+    if (mode === "mock") {
+      modelReady = true;
+      setModelStatus("Deterministic test model");
+      hideGate();
+      return;
+    }
+    busy = true;
+    setStatus("Loading model");
+    nodes.gateStatus.textContent = "Booting sandbox...";
+    writeln(`\x1b[2mPreparing ${modelLabel(mode)} on ${device}...\x1b[22m`);
+    try {
+      await bootSandbox({ quiet: true });
+      nodes.gateStatus.textContent = "Downloading model...";
+      await agent.preloadModel();
+      modelReady = true;
+      setModelStatus("Model ready");
+      nodes.gateStatus.textContent = "Model ready.";
+      hideGate();
+      writeln("\x1b[32mModel ready.\x1b[0m");
+    } catch (error) {
+      const message = error.stack || error.message || String(error);
+      setModelStatus("Model error");
+      nodes.gateStatus.textContent = message;
+      writeln(`\x1b[31m${message}\x1b[0m`);
+    } finally {
+      busy = false;
+      setStatus("Ready");
+      writePrompt();
+    }
+  }
+
+  function writeStartup() {
+    writeln(`pi - AI coding assistant with read, bash, edit, write tools`);
+    writeln(`version ${PI_CLI_VERSION} | web terminal ${terminal.engine} | cwd /workspace`);
+    writeln(`shortcuts: /hotkeys | /model | /settings | /session | /help`);
+    writeln(`loaded AGENTS.md: none | prompt templates: none | skills: none | extensions: none`);
+    writeln(`tools: ${PI_DEFAULT_TOOLS.join(", ")} (read-only extras available: grep, find, ls)`);
+    if (!modelReady) {
+      writeln(`model: ${modelLabel(mode)} is not downloaded. Use the setup dialog or /model mock.`);
+    } else {
+      writeln(`model: ${modelLabel(mode)}`);
+    }
+    writeln();
+  }
+
+  function footer() {
+    return `cwd /workspace | session ${sessionName} | model ${shortModelName(mode)} | ${maxNewTokens} max tokens | ${status}`;
+  }
+
+  function writePrompt() {
+    if (busy) return;
+    writeln(`\x1b[2m${footer()}\x1b[22m`);
+    write("> ");
+    terminal.focus();
+  }
+
+  function renderNewMessages() {
+    const messages = agent.state.messages;
+    while (renderedMessages < messages.length) {
+      const message = messages[renderedMessages];
+      renderedMessages += 1;
+      if (message.role === "user") continue;
+      if (message.role === "toolResult") {
+        const text = textFromContent(message.content);
+        const label = message.isError ? `[tool error: ${message.toolName}]` : `[tool: ${message.toolName}]`;
+        writeln(`\x1b[36m${label}\x1b[0m`);
+        if (text) writeln(text);
+        writeln();
+        continue;
+      }
+      const toolCalls = toolCallsFromMessage(message);
+      if (toolCalls.length > 0) {
+        writeln("\x1b[35mUsing pi tools:\x1b[0m");
+        for (const call of toolCalls) writeln(`  ${formatToolCall(call)}`);
+        writeln();
+        continue;
+      }
+      const text = textFromContent(message.content);
+      if (text) {
+        writeln("\x1b[32mpi\x1b[0m");
+        writeln(text);
+        writeln();
+      }
+    }
+  }
+
+  async function runBashLine(command, sendToModel) {
+    busy = true;
+    setStatus("Running command");
+    try {
+      await bootSandbox({ quiet: true });
+      writeln(`$ ${command}`);
+      const result = await sandbox.bash(command, 120);
+      if (result.output) writeln(result.output);
+      writeln(`exit ${result.exitCode}`);
+      if (sendToModel) {
+        await promptAgent(`Command output from \`${command}\`:\n${result.output || "(no output)"}\nexit ${result.exitCode}`);
+      }
+    } catch (error) {
+      writeln(`\x1b[31m${error.stack || error.message || String(error)}\x1b[0m`);
+    } finally {
+      busy = false;
+      setStatus("Ready");
+      if (!sendToModel) writePrompt();
+    }
+  }
+
+  async function promptAgent(prompt) {
+    if (mode !== "mock" && !modelReady) {
+      writeln("Download the selected local model before sending, or use /model mock.");
+      showGate("Download the selected model before sending, or use the test model.");
+      writePrompt();
+      return;
+    }
+
+    busy = true;
+    setStatus("Agent running");
+    try {
+      await bootSandbox({ quiet: true });
+      await agent.prompt(prompt);
+    } catch (error) {
+      writeln(`\x1b[31m${error.stack || error.message || String(error)}\x1b[0m`);
+    } finally {
+      busy = false;
+      setStatus("Ready");
+      const next = queuedLines.shift();
+      if (next) {
+        writeln(`\x1b[2m[dequeued] ${next}\x1b[22m`);
+        await handleLine(next, { fromQueue: true });
+      } else {
+        writePrompt();
+      }
+    }
+  }
+
+  function printModels() {
+    writeln("Available browser-local models:");
+    for (const [key, value] of Object.entries(LOCAL_MODELS)) {
+      writeln(`  ${key.padEnd(12)} ${value.id}`);
+    }
+    writeln("  mock         deterministic test model");
+    writeln("Use /model <key> to switch. Non-mock models run in this browser through Transformers.js.");
+  }
+
+  function printSession() {
+    writeln(`Session`);
+    writeln(`  id: ${sessionId}`);
+    writeln(`  name: ${sessionName}`);
+    writeln(`  messages: ${agent.state.messages.length}`);
+    writeln(`  cwd: /workspace`);
+    writeln(`  storage: browser memory`);
+  }
+
+  async function handleSlash(line) {
+    const [command, ...rest] = line.trim().split(/\s+/);
+    const argText = rest.join(" ");
+    switch (command) {
+      case "/help":
+        writeln(PI_HELP_TEXT);
+        break;
+      case "/hotkeys":
+        writeln(formatHotkeys());
+        break;
+      case "/model":
+        if (!argText) {
+          printModels();
+          break;
+        }
+        if (argText === "mock" || LOCAL_MODELS[argText]) {
+          mode = argText;
+          modelReady = mode === "mock";
+          resetAgent();
+          setModelStatus(modelReady ? "Deterministic test model" : "Model idle");
+          writeln(`model: ${modelLabel(mode)}`);
+          if (!modelReady) showGate("Download the selected model before sending.");
+          else hideGate();
+        } else {
+          writeln(`Unknown model: ${argText}`);
+          printModels();
+        }
+        break;
+      case "/settings":
+        if (argText.startsWith("device=")) {
+          device = argText.slice("device=".length) || device;
+          modelReady = mode === "mock";
+          resetAgent();
+        } else if (argText.startsWith("tokens=")) {
+          maxNewTokens = Number(argText.slice("tokens=".length)) || maxNewTokens;
+        } else if (argText.startsWith("temperature=")) {
+          temperature = Number(argText.slice("temperature=".length)) || 0;
+        }
+        writeln(`Settings`);
+        writeln(`  device: ${device}`);
+        writeln(`  max tokens: ${maxNewTokens}`);
+        writeln(`  temperature: ${temperature}`);
+        writeln(`  transport: browser-local Transformers.js`);
+        break;
+      case "/session":
+        printSession();
+        break;
+      case "/new":
+        resetAgent();
+        await sandbox.reset();
+        sessionId = crypto.randomUUID();
+        sessionName = "untitled";
+        writeln("Started a new browser session and reset the WebContainer workspace.");
+        break;
+      case "/name":
+        sessionName = argText || "untitled";
+        writeln(`Session name: ${sessionName}`);
+        break;
+      case "/tools":
+        writeln(`Default tools: ${PI_DEFAULT_TOOLS.join(", ")}`);
+        writeln(`Built-in tools: ${PI_BUILTIN_TOOLS.join(", ")}`);
+        break;
+      case "/clear":
+        terminal.clear();
+        outputText = "";
+        writeStartup();
+        break;
+      case "/login":
+      case "/logout":
+        writeln("This web port runs a local browser model, so provider login is not required. Use /model to switch local planners.");
+        break;
+      case "/resume":
+      case "/tree":
+      case "/fork":
+      case "/clone":
+      case "/compact":
+      case "/copy":
+      case "/export":
+      case "/share":
+      case "/reload":
+      case "/changelog":
+      case "/scoped-models":
+        writeln(`${command} is recognized from Pi CLI. In this static browser build it is represented in-memory; full filesystem-backed session management is a follow-up target.`);
+        break;
+      case "/quit":
+        writeln("Close this browser tab to quit the web terminal.");
+        break;
+      case "/commands":
+        writeln(PI_SLASH_COMMANDS.join("\n"));
+        break;
+      default:
+        writeln(`Unknown command: ${command}`);
+        writeln("Type /help or /commands.");
+        break;
+    }
+  }
+
+  async function handleLine(line, { fromQueue = false } = {}) {
+    const trimmed = line.trim();
+    if (!trimmed) {
+      writePrompt();
+      return;
+    }
+    if (busy && !fromQueue) {
+      queuedLines.push(line);
+      writeln(`\x1b[2m[queued] ${line}\x1b[22m`);
+      return;
+    }
+    if (trimmed.startsWith("/")) {
+      await handleSlash(trimmed);
+      writePrompt();
+      return;
+    }
+    if (trimmed.startsWith("!!")) {
+      await runBashLine(trimmed.slice(2).trim(), false);
+      return;
+    }
+    if (trimmed.startsWith("!")) {
+      await runBashLine(trimmed.slice(1).trim(), true);
+      return;
+    }
+    await promptAgent(line);
+  }
+
+  function redrawInput(nextInput) {
+    write("\r\x1b[2K> ");
+    input = nextInput;
+    write(input);
+  }
+
+  function handleData(data) {
+    for (const char of data) {
+      if (char === "\r") {
+        const submitted = input;
+        input = "";
+        writeln();
+        void handleLine(submitted);
+      } else if (char === "\u007f") {
+        if (input.length > 0) {
+          input = input.slice(0, -1);
+          write("\b \b");
+        }
+      } else if (char === "\x03") {
+        if (busy) {
+          agent.abort();
+          writeln("^C");
+          setStatus("Aborted");
+        } else if (input) {
+          redrawInput("");
+        } else {
+          writeln("^C");
+          writeln("Use /quit or close this browser tab to exit.");
+          writePrompt();
+        }
+      } else if (char === "\x1b") {
+        if (busy) agent.abort();
+      } else if (char >= " " && char !== "\x7f") {
+        input += char;
+        write(char);
+      }
+    }
+  }
+
+  nodes.confirmLoadModel.addEventListener("click", async () => {
+    device = nodes.gateDevice.value;
+    await loadModel();
+  });
+  nodes.useTestModel.addEventListener("click", () => {
+    mode = "mock";
+    modelReady = true;
+    resetAgent();
+    setModelStatus("Deterministic test model");
+    hideGate();
+    writeln("model: deterministic test model");
+    writePrompt();
+  });
+
+  resetAgent();
+  setStatus("Ready");
+  setSandboxStatus("Not booted");
+  setModelStatus(modelReady ? "Deterministic test model" : "Model idle");
+  nodes.gateDevice.value = device;
+  if (modelReady || params.get("setup") === "skip") hideGate();
+  else showGate("Ready.");
+
+  terminal.onData(handleData);
+  writeStartup();
+  writePrompt();
+
+  return {
+    loadModel,
+    handleLine,
+    get outputText() {
+      return outputText;
+    },
+    get transcript() {
+      return agent.state.messages
+        .map((message) => {
+          if (message.role === "toolResult") return `TOOL ${message.toolName}\n${textFromContent(message.content)}`;
+          return `${message.role.toUpperCase()}\n${textFromContent(message.content)}`;
+        })
+        .join("\n\n");
+    },
+    get modelReady() {
+      return modelReady;
+    },
+    get status() {
+      return status;
+    },
+    get mode() {
+      return mode;
+    },
+  };
+}

src/piCliContract.js

@@ -0,0 +1,101 @@
+export const PI_CLI_VERSION = "0.77.0";
+
+export const PI_DEFAULT_TOOLS = ["read", "bash", "edit", "write"];
+export const PI_BUILTIN_TOOLS = ["read", "bash", "edit", "write", "grep", "find", "ls"];
+
+export const PI_SLASH_COMMANDS = [
+  "/login",
+  "/logout",
+  "/model",
+  "/scoped-models",
+  "/settings",
+  "/resume",
+  "/new",
+  "/name <name>",
+  "/session",
+  "/tree",
+  "/fork",
+  "/clone",
+  "/compact [prompt]",
+  "/copy",
+  "/export [file]",
+  "/share",
+  "/reload",
+  "/hotkeys",
+  "/changelog",
+  "/quit",
+];
+
+export const PI_HELP_TEXT = `pi - AI coding assistant with read, bash, edit, write tools
+
+Usage:
+  pi [options] [@files...] [messages...]
+
+Commands:
+  pi install <source> [-l]     Install extension source and add to settings
+  pi remove <source> [-l]      Remove extension source from settings
+  pi uninstall <source> [-l]   Alias for remove
+  pi update [source|self|pi]   Update pi and installed extensions
+  pi list                      List installed extensions from settings
+  pi config                    Open TUI to enable/disable package resources
+  pi <command> --help          Show help for install/remove/uninstall/update/list
+
+Options:
+  --provider <name>              Provider name (default: google)
+  --model <pattern>              Model pattern or ID (supports "provider/id" and optional ":<thinking>")
+  --api-key <key>                API key (defaults to env vars)
+  --system-prompt <text>         System prompt (default: coding assistant prompt)
+  --append-system-prompt <text>  Append text or file contents to the system prompt (can be used multiple times)
+  --mode <mode>                  Output mode: text (default), json, or rpc
+  --print, -p                    Non-interactive mode: process prompt and exit
+  --continue, -c                 Continue previous session
+  --resume, -r                   Select a session to resume
+  --session <path|id>            Use specific session file or partial UUID
+  --session-id <id>              Use exact project session ID, creating it if missing
+  --fork <path|id>               Fork specific session file or partial UUID into a new session
+  --session-dir <dir>            Directory for session storage and lookup
+  --no-session                   Don't save session (ephemeral)
+  --models <patterns>            Comma-separated model patterns for Ctrl+P cycling
+  --no-tools, -nt                Disable all tools by default (built-in and extension)
+  --no-builtin-tools, -nbt       Disable built-in tools by default but keep extension/custom tools enabled
+  --tools, -t <tools>            Comma-separated allowlist of tool names to enable
+  --exclude-tools, -xt <tools>   Comma-separated denylist of tool names to disable
+  --thinking <level>             Set thinking level: off, minimal, low, medium, high, xhigh
+  --extension, -e <path>         Load an extension file (can be used multiple times)
+  --no-extensions, -ne           Disable extension discovery (explicit -e paths still work)
+  --skill <path>                 Load a skill file or directory (can be used multiple times)
+  --prompt-template <path>       Load a prompt template file or directory (can be used multiple times)
+  --theme <path>                 Load a theme file or directory (can be used multiple times)
+  --no-themes                    Disable theme discovery and loading
+  --no-context-files, -nc        Disable AGENTS.md and CLAUDE.md discovery and loading
+  --export <file>                Export session file to HTML and exit
+  --list-models [search]         List available models (with optional fuzzy search)
+  --verbose                      Force verbose startup (overrides quietStartup setting)
+  --offline                      Disable startup network operations (same as PI_OFFLINE=1)
+  --help, -h                     Show this help
+  --version, -v                  Show version number
+
+Built-in Tool Names:
+  read   - Read file contents
+  bash   - Execute bash commands
+  edit   - Edit files with find/replace
+  write  - Write files (creates/overwrites)
+  grep   - Search file contents (read-only, off by default)
+  find   - Find files by glob pattern (read-only, off by default)
+  ls     - List directory contents (read-only, off by default)`;
+
+export function formatHotkeys() {
+  return `Common Pi keybindings
+
+Ctrl+C        Clear editor
+Ctrl+C twice  Quit
+Escape        Cancel or abort
+Escape twice  Open /tree
+Ctrl+L        Open /model
+Ctrl+P        Cycle scoped models forward
+Shift+Ctrl+P  Cycle scoped models backward
+Shift+Tab     Cycle thinking level
+Ctrl+O        Collapse or expand tool output
+Ctrl+T        Collapse or expand thinking blocks
+Shift+Enter   Multi-line input`;
+}

src/sandbox.js

@@ -0,0 +1,388 @@
+const BOOT_FILES = {
+  "package.json": {
+    file: {
+      contents: JSON.stringify(
+        {
+          type: "module",
+          scripts: {
+            demo: "node hello.js",
+          },
+          dependencies: {},
+          devDependencies: {},
+        },
+        null,
+        2,
+      ),
+    },
+  },
+  "README.md": {
+    file: {
+      contents:
+        "# Pi web sandbox\n\nThis filesystem and every spawned process run inside WebContainers in this browser tab.\n",
+    },
+  },
+  "hello.js": {
+    file: {
+      contents: 'console.log("hello from the browser sandbox");\nconsole.log(2 + 2);\n',
+    },
+  },
+};
+
+const MAX_OUTPUT_CHARS = 16000;
+const DEFAULT_TIMEOUT_MS = 10000;
+const DEFAULT_MAX_READ_LINES = 2000;
+const DEFAULT_RESULT_LIMIT = 200;
+
+function splitCommandLine(value) {
+  const parts = [];
+  let current = "";
+  let quote = "";
+  let escaping = false;
+  for (const char of String(value || "")) {
+    if (escaping) {
+      current += char;
+      escaping = false;
+      continue;
+    }
+    if (char === "\\") {
+      escaping = true;
+      continue;
+    }
+    if (quote) {
+      if (char === quote) {
+        quote = "";
+      } else {
+        current += char;
+      }
+      continue;
+    }
+    if (char === "\"" || char === "'") {
+      quote = char;
+    } else if (/\s/.test(char)) {
+      if (current) {
+        parts.push(current);
+        current = "";
+      }
+    } else {
+      current += char;
+    }
+  }
+  if (current) parts.push(current);
+  return parts;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+
+function globToRegExp(glob) {
+  const source = String(glob || "*")
+    .split("*")
+    .map(escapeRegExp)
+    .join(".*");
+  return new RegExp(`^${source}$`);
+}
+
+export function createSandbox({ onLog = () => {}, onStatus = () => {} } = {}) {
+  let instance = null;
+  let booting = null;
+  let root = "";
+
+  async function boot() {
+    if (instance) return instance;
+    if (booting) return booting;
+
+    booting = (async () => {
+      if (!globalThis.crossOriginIsolated) {
+        throw new Error("WebContainers need cross-origin isolation. Start this app through Vite or another server that sends COOP/COEP headers.");
+      }
+
+      onStatus("Booting WebContainer");
+      const { WebContainer } = await import("@webcontainer/api");
+      instance = await WebContainer.boot({
+        coep: "credentialless",
+        workdirName: "workspace",
+      });
+      root = instance.workdir;
+      await instance.mount(BOOT_FILES);
+      onLog(`sandbox booted at ${root}`);
+      onStatus("Sandbox ready");
+      return instance;
+    })();
+
+    try {
+      return await booting;
+    } finally {
+      booting = null;
+    }
+  }
+
+  function assertRelativePath(path, { allowDot = false } = {}) {
+    let value = String(path ?? (allowDot ? "." : "")).trim();
+    if (value === "" && allowDot) value = ".";
+    value = value.replace(/^\/+/, "").replace(/^workspace\/?/, "");
+    if (value === "." && allowDot) return ".";
+    if (!value || value.includes("\0")) throw new Error("Path is required.");
+    const segments = value.split("/").filter(Boolean);
+    if (segments.some((segment) => segment === "..")) {
+      throw new Error("Paths must stay inside the sandbox workspace.");
+    }
+    const normalized = segments.filter((segment) => segment !== ".").join("/");
+    if (!normalized && allowDot) return ".";
+    if (!normalized) throw new Error("Path is required.");
+    return normalized;
+  }
+
+  function toWorkspacePath(path, options) {
+    return assertRelativePath(path, options);
+  }
+
+  async function pathExists(path) {
+    const wc = await boot();
+    try {
+      await wc.fs.stat(toWorkspacePath(path, { allowDot: true }));
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  async function reset() {
+    const wc = await boot();
+    const entries = await wc.fs.readdir(".");
+    await Promise.all(
+      entries.map((entry) =>
+        wc.fs.rm(entry, {
+          force: true,
+          recursive: true,
+        }),
+      ),
+    );
+    await wc.mount(BOOT_FILES);
+    onLog("sandbox reset");
+    return "Sandbox reset to the starter project.";
+  }
+
+  async function walkFiles(start = ".") {
+    const wc = await boot();
+    const rootPath = toWorkspacePath(start, { allowDot: true });
+    const files = [];
+
+    async function walk(current) {
+      const entries = await wc.fs.readdir(current, { withFileTypes: true });
+      for (const entry of entries) {
+        if (entry.name === "node_modules" || entry.name === ".git") continue;
+        const child = current === "." ? entry.name : `${current}/${entry.name}`;
+        if (entry.isDirectory()) {
+          await walk(child);
+        } else {
+          files.push(child);
+        }
+      }
+    }
+
+    const stat = await wc.fs.stat(rootPath);
+    if (stat.isDirectory()) {
+      await walk(rootPath);
+    } else {
+      files.push(rootPath);
+    }
+    return files;
+  }
+
+  async function ls(path = ".", limit = DEFAULT_RESULT_LIMIT) {
+    const wc = await boot();
+    const target = toWorkspacePath(path || ".", { allowDot: true });
+    const stat = await wc.fs.stat(target);
+    if (!stat.isDirectory()) return `file ${target}`;
+    const entries = await wc.fs.readdir(target, { withFileTypes: true });
+    const capped = entries.slice(0, Number(limit || DEFAULT_RESULT_LIMIT));
+    const lines = capped.map((entry) => `${entry.isDirectory() ? "dir " : "file"} ${entry.name}`);
+    if (entries.length > capped.length) {
+      lines.push(`[Showing ${capped.length} of ${entries.length} entries. Use a larger limit to continue.]`);
+    }
+    return lines.join("\n") || "(empty)";
+  }
+
+  async function readTextFile(path, { offset, limit } = {}) {
+    const wc = await boot();
+    const target = toWorkspacePath(path);
+    const text = await wc.fs.readFile(target, "utf-8");
+    const lines = text.split("\n");
+    const start = Math.max(0, Number(offset || 1) - 1);
+    if (start >= lines.length) throw new Error(`Offset ${offset} is beyond end of file (${lines.length} lines total)`);
+    const maxLines = Number(limit || DEFAULT_MAX_READ_LINES);
+    const selected = lines.slice(start, start + maxLines);
+    let output = selected.join("\n");
+    if (start + selected.length < lines.length) {
+      output += `\n\n[${lines.length - start - selected.length} more lines in file. Use offset=${start + selected.length + 1} to continue.]`;
+    }
+    return output;
+  }
+
+  async function writeFile(path, content) {
+    const wc = await boot();
+    const relative = assertRelativePath(path);
+    const parent = relative.split("/").slice(0, -1).join("/");
+    if (parent) {
+      await wc.fs.mkdir(parent, { recursive: true });
+    }
+    await wc.fs.writeFile(relative, String(content ?? ""));
+    onLog(`wrote ${relative}`);
+    return `Successfully wrote ${String(content ?? "").length} bytes to ${relative}`;
+  }
+
+  async function editFile(path, edits = []) {
+    const wc = await boot();
+    const target = toWorkspacePath(path);
+    if (!Array.isArray(edits) || edits.length === 0) {
+      throw new Error("Edit tool input is invalid. edits must contain at least one replacement.");
+    }
+    const original = await wc.fs.readFile(target, "utf-8");
+    const replacements = [];
+    for (const edit of edits) {
+      const oldText = String(edit?.oldText ?? "");
+      const newText = String(edit?.newText ?? "");
+      if (!oldText) throw new Error("Every edit.oldText must be non-empty.");
+      const first = original.indexOf(oldText);
+      if (first === -1) throw new Error(`Could not edit file: ${path}. oldText was not found.`);
+      if (original.indexOf(oldText, first + oldText.length) !== -1) {
+        throw new Error(`Could not edit file: ${path}. oldText must match exactly one location.`);
+      }
+      replacements.push({ start: first, end: first + oldText.length, newText });
+    }
+    replacements.sort((a, b) => b.start - a.start);
+    for (let index = 1; index < replacements.length; index += 1) {
+      if (replacements[index].end > replacements[index - 1].start) {
+        throw new Error("Edit tool input is invalid. edits must not overlap.");
+      }
+    }
+    let next = original;
+    for (const replacement of replacements) {
+      next = `${next.slice(0, replacement.start)}${replacement.newText}${next.slice(replacement.end)}`;
+    }
+    await wc.fs.writeFile(target, next);
+    onLog(`edited ${target}`);
+    return `Successfully replaced ${edits.length} block(s) in ${path}.`;
+  }
+
+  async function findFiles(pattern = "*", path = ".", limit = DEFAULT_RESULT_LIMIT) {
+    const start = toWorkspacePath(path || ".", { allowDot: true });
+    if (!(await pathExists(start))) throw new Error(`Path does not exist: ${path || "."}`);
+    const matcher = globToRegExp(pattern);
+    const files = await walkFiles(start);
+    const matches = files.filter((file) => matcher.test(file) || matcher.test(file.split("/").pop() || ""));
+    const capped = matches.slice(0, Number(limit || DEFAULT_RESULT_LIMIT));
+    if (matches.length > capped.length) capped.push(`[Showing ${capped.length} of ${matches.length} matches. Use a larger limit to continue.]`);
+    return capped.join("\n") || "(no matches)";
+  }
+
+  async function grepFiles({ pattern, path = ".", glob = "*", ignoreCase = false, literal = false, context = 0, limit = DEFAULT_RESULT_LIMIT }) {
+    if (!pattern) throw new Error("pattern is required.");
+    const flags = ignoreCase ? "i" : "";
+    const matcher = literal ? new RegExp(escapeRegExp(pattern), flags) : new RegExp(pattern, flags);
+    const globMatcher = globToRegExp(glob || "*");
+    const files = (await walkFiles(path || ".")).filter((file) => globMatcher.test(file) || globMatcher.test(file.split("/").pop() || ""));
+    const matches = [];
+    for (const file of files) {
+      let text = "";
+      try {
+        text = await readTextFile(file, { limit: DEFAULT_MAX_READ_LINES });
+      } catch {
+        continue;
+      }
+      const lines = text.split("\n");
+      for (let index = 0; index < lines.length; index += 1) {
+        if (!matcher.test(lines[index])) continue;
+        matcher.lastIndex = 0;
+        const before = Math.max(0, index - Number(context || 0));
+        const after = Math.min(lines.length - 1, index + Number(context || 0));
+        for (let lineIndex = before; lineIndex <= after; lineIndex += 1) {
+          matches.push(`${file}:${lineIndex + 1}:${lines[lineIndex]}`);
+          if (matches.length >= Number(limit || DEFAULT_RESULT_LIMIT)) {
+            matches.push(`[Showing first ${matches.length - 1} matches. Use a larger limit to continue.]`);
+            return matches.join("\n");
+          }
+        }
+      }
+    }
+    return matches.join("\n") || "(no matches)";
+  }
+
+  async function spawnProcess(command, args = [], timeoutMs = DEFAULT_TIMEOUT_MS) {
+    const wc = await boot();
+    const cmd = String(command || "").trim();
+    if (!cmd) throw new Error("Command is required.");
+    const cleanArgs = Array.isArray(args) ? args.map((arg) => String(arg)) : [];
+
+    onLog(`$ ${[cmd, ...cleanArgs].join(" ")}`);
+    const process = await wc.spawn(cmd, cleanArgs, {
+      terminal: {
+        cols: 96,
+        rows: 28,
+      },
+    });
+
+    let output = "";
+    const reader = process.output.getReader();
+    const pump = (async () => {
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        output += value;
+        if (output.length > MAX_OUTPUT_CHARS) {
+          output = `${output.slice(0, MAX_OUTPUT_CHARS)}\n[output truncated]`;
+          process.kill();
+          break;
+        }
+      }
+    })();
+
+    const timeout = new Promise((resolve) => {
+      setTimeout(() => {
+        process.kill();
+        resolve("timeout");
+      }, Number(timeoutMs) || DEFAULT_TIMEOUT_MS);
+    });
+
+    const exitCode = await Promise.race([process.exit, timeout]);
+    await pump.catch(() => {});
+    const normalizedExitCode = exitCode === "timeout" ? 124 : exitCode;
+    const result = {
+      command: [cmd, ...cleanArgs].join(" "),
+      exitCode: normalizedExitCode,
+      output: output.trimEnd(),
+    };
+    onLog(`exit ${normalizedExitCode}`);
+    return result;
+  }
+
+  async function bash(command, timeoutSeconds) {
+    const timeoutMs = timeoutSeconds ? Number(timeoutSeconds) * 1000 : DEFAULT_TIMEOUT_MS;
+    try {
+      return await spawnProcess("jsh", ["-c", command], timeoutMs);
+    } catch (error) {
+      const parts = splitCommandLine(command);
+      if (parts.length === 0) throw error;
+      return await spawnProcess(parts[0], parts.slice(1), timeoutMs);
+    }
+  }
+
+  return {
+    boot,
+    reset,
+    bash,
+    editFile,
+    findFiles,
+    grepFiles,
+    ls,
+    listFiles: ls,
+    readFile: (path) => readTextFile(path),
+    readTextFile,
+    writeFile,
+    runCommand: spawnProcess,
+    get isReady() {
+      return Boolean(instance);
+    },
+  };
+}

src/styles.css

@@ -0,0 +1,226 @@
+:root {
+  color: #d6deeb;
+  background: #0b0f16;
+  font-family:
+    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#app {
+  min-width: 320px;
+  min-height: 100vh;
+  margin: 0;
+}
+
+button,
+select {
+  font: inherit;
+}
+
+button {
+  min-height: 40px;
+  padding: 0 15px;
+  border: 0;
+  border-radius: 6px;
+  background: #227c70;
+  color: #ffffff;
+  font-weight: 750;
+  cursor: pointer;
+}
+
+button:disabled {
+  cursor: wait;
+  opacity: 0.6;
+}
+
+#app {
+  display: grid;
+  grid-template-rows: auto minmax(0, 1fr);
+  gap: 10px;
+  padding: 10px;
+}
+
+.runtime-bar {
+  display: flex;
+  align-items: end;
+  justify-content: space-between;
+  gap: 16px;
+  min-height: 54px;
+  padding: 4px 2px 10px;
+  border-bottom: 1px solid #263244;
+}
+
+h1,
+h2,
+p {
+  margin: 0;
+}
+
+h1 {
+  color: #f8fafc;
+  font-size: 30px;
+  line-height: 1;
+  letter-spacing: 0;
+}
+
+#model-label {
+  margin-top: 5px;
+  color: #9eb1ca;
+  font-size: 13px;
+  overflow-wrap: anywhere;
+}
+
+.status-stack {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: end;
+  gap: 8px;
+  max-width: 760px;
+}
+
+.status {
+  min-height: 32px;
+  max-width: 280px;
+  padding: 6px 10px;
+  border: 1px solid #344156;
+  border-radius: 6px;
+  background: #141b27;
+  color: #cad7ea;
+  font-size: 13px;
+  overflow-wrap: anywhere;
+}
+
+.terminal-shell {
+  min-height: 0;
+  border: 1px solid #263244;
+  border-radius: 8px;
+  background: #10141c;
+  overflow: hidden;
+}
+
+#terminal {
+  width: 100%;
+  height: calc(100vh - 86px);
+  min-height: 420px;
+  padding: 10px;
+}
+
+.xterm {
+  height: 100%;
+}
+
+.xterm-viewport,
+.xterm-screen {
+  border-radius: 0;
+}
+
+.model-gate {
+  position: fixed;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  padding: 18px;
+  background: rgba(4, 8, 14, 0.64);
+  z-index: 20;
+}
+
+.model-gate.hidden {
+  display: none;
+}
+
+.model-dialog {
+  display: grid;
+  gap: 16px;
+  width: min(560px, 100%);
+  padding: 22px;
+  border: 1px solid #334155;
+  border-radius: 8px;
+  background: #f8fafc;
+  color: #172033;
+  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
+}
+
+.eyebrow {
+  margin-bottom: 7px;
+  color: #227c70;
+  font-size: 12px;
+  font-weight: 850;
+  text-transform: uppercase;
+}
+
+.model-dialog h2 {
+  color: #172033;
+  font-size: 24px;
+  line-height: 1.15;
+}
+
+.dialog-copy {
+  margin-top: 8px;
+  color: #526173;
+  line-height: 1.5;
+}
+
+.dialog-actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+}
+
+#use-test-model {
+  background: #4f5f73;
+}
+
+.dialog-options {
+  display: grid;
+  gap: 10px;
+  color: #526173;
+}
+
+label {
+  display: grid;
+  gap: 6px;
+  font-size: 13px;
+  font-weight: 700;
+}
+
+select {
+  width: 100%;
+  height: 40px;
+  padding: 0 10px;
+  border: 1px solid #b8c5d4;
+  border-radius: 6px;
+  background: #ffffff;
+  color: #152033;
+}
+
+#gate-status {
+  min-height: 22px;
+  color: #526173;
+  overflow-wrap: anywhere;
+}
+
+@media (max-width: 760px) {
+  #app {
+    padding: 8px;
+  }
+
+  .runtime-bar {
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .status-stack {
+    justify-content: start;
+  }
+
+  #terminal {
+    height: calc(100vh - 164px);
+    min-height: 360px;
+    padding: 8px;
+  }
+}

src/webTerminal.js

@@ -0,0 +1,88 @@
+import "@xterm/xterm/css/xterm.css";
+
+const THEME = {
+  background: "#10141c",
+  foreground: "#d6deeb",
+  cursor: "#f7c948",
+  cursorAccent: "#10141c",
+  selectionBackground: "#334155",
+  black: "#111827",
+  red: "#f87171",
+  green: "#34d399",
+  yellow: "#facc15",
+  blue: "#60a5fa",
+  magenta: "#c084fc",
+  cyan: "#22d3ee",
+  white: "#f8fafc",
+  brightBlack: "#475569",
+  brightRed: "#fca5a5",
+  brightGreen: "#86efac",
+  brightYellow: "#fde68a",
+  brightBlue: "#93c5fd",
+  brightMagenta: "#d8b4fe",
+  brightCyan: "#67e8f9",
+  brightWhite: "#ffffff",
+};
+
+function normalizeNewlines(text) {
+  return String(text).replace(/\r?\n/g, "\r\n");
+}
+
+export async function createWebTerminal(container) {
+  let terminal;
+  let fitAddon;
+  let engine = "ghostty-web";
+
+  try {
+    const ghostty = await import("ghostty-web");
+    await ghostty.init();
+    terminal = new ghostty.Terminal({
+      cursorBlink: true,
+      fontFamily: "JetBrains Mono, SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace",
+      fontSize: 14,
+      rows: 30,
+      cols: 100,
+      scrollback: 5000,
+      theme: THEME,
+    });
+    fitAddon = new ghostty.FitAddon();
+    terminal.loadAddon(fitAddon);
+  } catch (error) {
+    const [{ Terminal }, { FitAddon }] = await Promise.all([import("@xterm/xterm"), import("@xterm/addon-fit")]);
+    engine = "xterm";
+    terminal = new Terminal({
+      cursorBlink: true,
+      fontFamily: "JetBrains Mono, SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace",
+      fontSize: 14,
+      rows: 30,
+      cols: 100,
+      scrollback: 5000,
+      theme: THEME,
+    });
+    fitAddon = new FitAddon();
+    terminal.loadAddon(fitAddon);
+    console.warn("ghostty-web failed, using xterm fallback", error);
+  }
+
+  terminal.open(container);
+  fitAddon.fit();
+  terminal.focus();
+
+  const resizeObserver = new ResizeObserver(() => fitAddon.fit());
+  resizeObserver.observe(container);
+
+  return {
+    engine,
+    raw: terminal,
+    onData: (handler) => terminal.onData(handler),
+    write: (text) => terminal.write(normalizeNewlines(text)),
+    writeln: (text = "") => terminal.write(`${normalizeNewlines(text)}\r\n`),
+    clear: () => terminal.clear(),
+    focus: () => terminal.focus(),
+    fit: () => fitAddon.fit(),
+    dispose: () => {
+      resizeObserver.disconnect();
+      terminal.dispose();
+    },
+  };
+}

vite.config.js

@@ -0,0 +1,16 @@
+import { defineConfig } from "vite";
+
+const headers = {
+  "Cross-Origin-Embedder-Policy": "credentialless",
+  "Cross-Origin-Opener-Policy": "same-origin",
+};
+
+export default defineConfig({
+  server: {
+    headers,
+  },
+  preview: {
+    headers,
+  },
+});
+