Claude Managed Agent

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Delete after.\nimport { ensureConfig } from \"./backend/agent.ts\";\nimport { blob } from \"https://esm.town/v/std/blob\";\nimport Anthropic from \"npm:@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\nconst BETA = \"managed-agents-2026-04-01\";\nconst { agentId, envId } = await ensureConfig();\nconst session = await client.beta.sessions.create({ agent: agentId, environment_id: envId, title: \"verify2\" });\nconst stream = await client.beta.sessions.events.stream(session.id);\nawait client.beta.sessions.events.send(session.id, {\n events: [{ type: \"user.message\", content: [{ type: \"text\", text: \"Use bash with python Pillow to create a 120x80 solid blue PNG named box.png, then say done.\" }] }],\n});\nfor await (const ev of stream) {\n const e = ev as any;\n if (ev.type === \"session.error\") { console.log(\"ERR\", JSON.stringify(e.error)); break; }\n if (ev.type === \"session.status_idle\") break;\n}\n\nconst list = await client.beta.files.list({ scope_id: session.id, betas: [BETA] } as any);\nconsole.log(\"FILES\", JSON.stringify((list.data as any[]).map((f) => ({ id: f.id, filename: f.filename, mime: f.mime_type, downloadable: f.downloadable }))));\nconst f = (list.data as any[]).find((x) => x.downloadable !== false);\nconst dl = await client.beta.files.download(f.id, { betas: [BETA] } as any);\nconsole.log(\"DL ctor\", (dl as any)?.constructor?.name);\nconst buf = await (dl as any).arrayBuffer();\nconsole.log(\"DL BYTES\", buf.byteLength);\nawait blob.set(`file_${f.id}`, new Uint8Array(buf));\nconsole.log(\"BLOB BACK BYTES\", (await (await blob.get(`file_${f.id}`)).arrayBuffer()).byteLength);\nconsole.log(\"KEYS NOW\", JSON.stringify(await blob.list(\"file_\")));\nawait 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template with client-side React & Hono 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{ parseVal, serveFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport * as db from \"./backend/db.ts\";\nimport { ensureSession, runTurn } from \"./backend/agent.ts\";\nimport { getFileBytes } from \"./backend/files.ts\";\n\nconst app = new Hono();\n\n// Static frontend\napp.get(\"/\", () => serveFile(\"/frontend/index.html\"));\napp.get(\"/frontend/**/*\", (c) => serveFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// Threads\napp.get(\"/api/threads\", async (c) => c.json(await db.listThreads()));\napp.post(\"/api/threads\", async (c) => {\n const id = crypto.randomUUID();\n await db.createThread(id, \"New chat\");\n return c.json(await db.getThread(id));\n});\n\n// Serve a sandbox file the agent surfaced: bytes from blob, mime/name from the\n// matching message row. Images render inline; other files download.\napp.get(\"/api/files/:id\", async (c) => {\n const id = c.req.param(\"id\");\n const meta = await db.getFilePayload(id);\n if (!meta) return c.notFound();\n const res = await getFileBytes(id);\n const headers: Record = { \"Content-Type\": meta.mime };\n if (!meta.mime.startsWith(\"image/\")) {\n headers[\"Content-Disposition\"] = `attachment; filename=\"${meta.name}\"`;\n }\n return new Response(await res.arrayBuffer(), { headers });\n});\n\n// Poll for messages newer than the last row the client has seen\napp.get(\"/api/threads/:id/messages\", async (c) =>\n c.json(await db.getMessages(c.req.param(\"id\"), Number(c.req.query(\"after\") ?? 0))));\n\n// One user turn. Stays open for the whole agent turn: insert the user row,\n// ensure a session, then stream events into SQLite until idle. UI relies on polling.\napp.post(\"/api/threads/:id/messages\", async (c) => {\n const thread = await db.getThread(c.req.param(\"id\"));\n const { text } = await c.req.json();\n await db.addMessage(thread.id, \"user\", \"text\", text);\n if (thread.title === \"New chat\") await db.setTitle(thread.id, text.slice(0, 60));\n const sessionId = await ensureSession(thread);\n await runTurn(thread.id, sessionId, text);\n return c.json({ ok: true });\n});\n\n// Unwrap Hono errors so we get real stack traces instead of \"Internal Server Error\"\napp.onError((err) => Promise.reject(err));\n\nexport default app.fetch;\n",[159],"4dcca388-5e9a-11f1-8626-1607ee4eb77e","diag.ts","4dcca43c-5e9a-11f1-8626-1607ee4eb77e",31,["D",1780415224830],"// Throwaway diagnostic for the \"blob not found\" bug. Delete after.\nimport { blob } from \"https://esm.town/v/std/blob\";\n\n// 1) Does set/get roundtrip in THIS val's blob store?\nawait blob.set(\"diag_test\", \"hello\");\nconsole.log(\"ROUNDTRIP\", await (await blob.get(\"diag_test\")).text());\n\n// 2) What keys actually exist in this val's blob store?\nconsole.log(\"FILE_ KEYS\", JSON.stringify(await blob.list(\"file_\")));\nconst all = await blob.list();\nconsole.log(\"ALL KEY COUNT\", all.length, \"SAMPLE\", JSON.stringify(all.slice(0, 10)));\n\nawait blob.delete(\"diag_test\");\n",[167],"bad6673a-5e99-11f1-b98f-1607ee4eb77e","README.md","019e88ee-890a-72f8-a279-21928a58e16f",28,["D",1780414978265],"# Claude Managed Agent — Chat UI\n\nAn interactive chat UI for talking to a\n[Claude Managed Agent](https://platform.claude.com/docs/en/managed-agents/quickstart).\nEach thread is one stateful agent **session** — persistent history plus a sandbox\nwith bash, file editing, and web tools. Hono (backend) + React (frontend), with\nVal Town SQLite for storage.\n\nWhere [`claude-managed-agents`](https://www.val.town/x/templates/claude-managed-agents)\nis a one-shot script, this is a multi-turn, multi-thread UI.\n\n## How it works\n\n- **A thread = one session.** The agent + environment are created **once** (lazily\n on first use) and their ids are cached in a `config` row — sessions pin to an\n agent version, so recreating them per request would be wrong. Each thread makes\n one session and reuses it for follow-up turns.\n- On a new user message the server inserts the user row, ensures the thread has a\n session, then **opens the event stream, sends the message, and writes each event\n to SQLite as it arrives** (`agent.message` → text, `agent.tool_use` → tool name,\n `session.error` → error), returning when the session goes idle.\n- The **frontend polls** `GET /api/threads/:id/messages?after=` about once a\n second and renders new rows in order. No SSE to the browser.\n- The built-in toolset runs in Anthropic's sandbox with\n `permission_policy: always_allow`, so tools just run — no approval prompts.\n- **Files the agent creates** (images, charts, PDFs) are surfaced after each turn.\n When the session goes idle, `backend/files.ts` lists the session's files via the\n Managed Agents Files API (`files.list({ scope_id })`), downloads any new ones\n (`files.download(id)`), stashes the bytes in `std/blob` (key `file_`),\n and writes a `messages` row for each — `type: \"image\"` for `image/*`, else\n `type: \"file\"`. The row's `content` is JSON `{ id, name, mime }`. The frontend\n renders images inline and other files as a `⬇ name` download link, both pointing\n at `GET /api/files/:id`, which streams the blob bytes with the right Content-Type.\n\n## Setup\n\nSet `ANTHROPIC_API_KEY` (from ).\nEverything else is created on the first message. Tweak the model or system prompt\nin `backend/agent.ts`.\n\n## Files\n\n- `index.ts` — Hono server + API routes\n- `backend/db.ts` — SQLite schema + helpers (`threads`, `messages`, `config`)\n- `backend/agent.ts` — Managed Agents: create-once config, per-thread session, per-turn streaming\n- `backend/files.ts` — surface sandbox files: Files API → `std/blob` → image/file message rows\n- `frontend/` — React chat UI (`App.tsx`, `Chat.tsx`, `api.ts`)\n\n## Backlog (not built yet)\n\n- **Stream reconnection.** The turn request stays open for the whole agent turn. If\n it dies before `session.status_idle`, reopen the stream and replay events for that\n `session_id` from the thread's `last_cursor` to resume writing to SQLite — session\n state is persisted server-side, so it's recoverable.\n- **Long turns** may exceed Val Town request limits → tied to the reconnection /\n background-execution work above.\n- **Auth + townie mode.** Add Val Town OAuth (`std/oauth`), then per-user MCP:\n declare the Val Town MCP server (`https://api.val.town/v3/mcp`) on the agent and\n inject the user's bearer token via a per-user vault credential at session creation,\n so the agent can edit the logged-in user's vals.\n\n[View source](/source)\n",[174],"f94df35a-5e96-11f1-a008-1607ee4eb77e","frontend","019e88ee-890a-72f8-a279-1cf939beedf1",["D",1780413794401],"directory",[181],"31cdaeaa-5e97-11f1-91e4-1607ee4eb77e","backend","d776a2ad-ff3e-4481-8dd0-5ebd71580eb6",2,["D",1780413889356],[187],"pulls","branches","forks","envVars",{"_199":62,"_201":155},"connections",{"_199":155,"_200":155},"count","unfilledCount","emptyCount",{"_42":186,"_32":187,"_30":188,"_152":-5,"_40":41,"_39":189,"_153":24,"_37":311,"_13":155,"_33":184,"_35":-5,"_23":26,"_156":-5,"_219":312,"_27":313},{"_42":302,"_32":303,"_30":304,"_152":188,"_40":41,"_39":305,"_153":26,"_37":306,"_13":307,"_33":34,"_35":308,"_23":26,"_156":-5,"_219":309,"_27":310},{"_42":294,"_32":295,"_30":296,"_152":188,"_40":41,"_39":297,"_153":26,"_37":298,"_13":62,"_33":34,"_35":299,"_23":26,"_156":-5,"_219":300,"_27":301},{"_42":286,"_32":287,"_30":288,"_152":188,"_40":41,"_39":289,"_153":26,"_37":290,"_13":62,"_33":34,"_35":291,"_23":26,"_156":-5,"_219":292,"_27":293},{"_42":180,"_32":181,"_30":182,"_152":-5,"_40":41,"_39":62,"_153":24,"_37":283,"_13":155,"_33":184,"_35":-5,"_23":26,"_156":-5,"_219":284,"_27":285},{"_42":279,"_32":262,"_30":256,"_152":182,"_40":41,"_39":62,"_153":24,"_37":280,"_13":155,"_33":184,"_35":-5,"_23":26,"_156":-5,"_219":281,"_27":282},{"_42":271,"_32":272,"_30":273,"_152":256,"_40":41,"_39":274,"_153":26,"_37":275,"_13":62,"_33":34,"_35":276,"_23":26,"_156":-5,"_219":277,"_27":278},{"_42":263,"_32":264,"_30":265,"_152":256,"_40":41,"_39":266,"_153":26,"_37":267,"_13":62,"_33":34,"_35":268,"_23":26,"_156":-5,"_219":269,"_27":270},{"_42":253,"_32":254,"_30":255,"_152":256,"_40":41,"_39":257,"_153":26,"_37":258,"_13":62,"_33":34,"_35":259,"_23":26,"_156":-5,"_219":260,"_27":261},{"_42":246,"_32":247,"_30":248,"_152":182,"_40":41,"_39":62,"_153":26,"_37":249,"_13":155,"_33":20,"_35":250,"_23":26,"_156":-5,"_219":251,"_27":252},{"_42":238,"_32":239,"_30":240,"_152":182,"_40":41,"_39":241,"_153":26,"_37":242,"_13":62,"_33":20,"_35":243,"_23":26,"_156":-5,"_219":244,"_27":245},{"_42":231,"_32":232,"_30":233,"_152":182,"_40":41,"_39":62,"_153":24,"_37":234,"_13":155,"_33":34,"_35":235,"_23":26,"_156":-5,"_219":236,"_27":237},{"_42":173,"_32":174,"_30":175,"_152":-5,"_40":41,"_39":176,"_153":26,"_37":228,"_13":162,"_33":20,"_35":178,"_23":26,"_156":-5,"_219":229,"_27":230},{"_42":166,"_32":167,"_30":168,"_152":-5,"_40":41,"_39":169,"_153":26,"_37":225,"_13":155,"_33":34,"_35":171,"_23":26,"_156":-5,"_219":226,"_27":227},{"_42":158,"_32":159,"_30":57,"_152":-5,"_40":41,"_39":160,"_153":26,"_37":222,"_13":162,"_33":163,"_35":164,"_23":26,"_156":44,"_219":223,"_27":224},{"_42":151,"_32":28,"_30":31,"_152":-5,"_40":41,"_39":14,"_153":26,"_37":218,"_13":155,"_33":34,"_35":36,"_23":26,"_156":-5,"_219":220,"_27":221},["D",1780415297144],"children",[],[28],["D",1780414765404],[],[159],["D",1780415224830],[],[167],["D",1780414978265],[],[174],"f94deee6-5e96-11f1-a008-1607ee4eb77e","index.tsx","019e88ee-890a-72f8-a279-1a31fa3e7e92",["D",1780413794401],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { createRoot } from \"https://esm.sh/react-dom@18.2.0/client\";\nimport { App } from \"./components/App.tsx\";\n\nconst root = document.getElementById(\"root\");\nif (!root) {\n throw new Error(\"No root element found\");\n}\n\ncreateRoot(root).render();",[],[181,232],"fd6d187a-5e97-11f1-b3a7-1607ee4eb77e","index.html","019e88ee-890a-72f8-a279-15dc455934ab",11,["D",1780414230995],"\n\n \n \n \n Claude Managed Agent\n \n \n \n \n

\n \n \n \n",[],[181,239],"f94de36a-5e96-11f1-a008-1607ee4eb77e","favicon.svg","019e88ee-890a-72f8-a279-127b4bb2ba62",["D",1780413794401],"\n",[],[181,247],"43f67574-5e99-11f1-9ea1-1607ee4eb77e","api.ts","e8672b46-5e97-11f1-a823-1607ee4eb77e","019e88ee-890a-72f8-a279-0d2bca618dcd",22,["D",1780414778832],"export interface Thread {\n id: string;\n session_id: string | null;\n title: string;\n last_cursor: string | null;\n created_at: string;\n}\n\nexport interface Message {\n id: number;\n thread_id: string;\n role: \"user\" | \"assistant\" | \"system\";\n // text/tool_use/error carry plain text in `content`. image/file carry a JSON\n // payload: { id, name, mime } — the file is served at /api/files/.\n type: \"text\" | \"tool_use\" | \"error\" | \"image\" | \"file\";\n content: string;\n created_at: string;\n}\n\nexport interface FilePayload {\n id: string;\n name: string;\n mime: string;\n}\n\nasync function json(res: Response): Promise {\n if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);\n return res.json() as Promise;\n}\n\nexport const api = {\n listThreads(): Promise {\n return fetch(\"/api/threads\").then((r) => json(r));\n },\n createThread(): Promise {\n return fetch(\"/api/threads\", { method: \"POST\" }).then((r) => json(r));\n },\n getMessages(threadId: string, after: number): Promise {\n return fetch(`/api/threads/${threadId}/messages?after=${after}`).then((r) =>\n json(r)\n );\n },\n send(threadId: string, text: string): Promise<{ ok: true }> {\n return fetch(`/api/threads/${threadId}/messages`, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ text }),\n }).then((r) => json<{ ok: true }>(r));\n },\n};\n",[],[181,262,254],"components","48855664-5e99-11f1-8734-1607ee4eb77e","Chat.tsx","f078aca6-5e97-11f1-bd0e-1607ee4eb77e",23,["D",1780414786474],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport type { FilePayload, Message } from \"./api.ts\";\n\nfunction MessageRow({ m }: { m: Message }) {\n // Files the agent created in its sandbox: images inline, others as a download.\n if (m.type === \"image\" || m.type === \"file\") {\n const f = JSON.parse(m.content) as FilePayload;\n const url = `/api/files/${f.id}`;\n return (\n

\n {m.type === \"image\"\n ? (\n \n {f.name}

\n \n )\n : (\n \n ⬇ {f.name}\n \n )}\n

\n );\n }\n if (m.role === \"user\") {\n return (\n

\n {m.content}\n

\n );\n }\n if (m.role === \"system\" && m.type === \"error\") {\n return

{m.content}

;\n }\n if (m.role === \"assistant\" && m.type === \"tool_use\") {\n return

🔧 {m.content}

;\n }\n return (\n

\n {m.content}\n

\n );\n}\n\nexport function Chat(\n { messages, onSend, busy }: {\n messages: Message[];\n onSend: (text: string) => void;\n busy: boolean;\n },\n) {\n const [text, setText] = useState(\"\");\n const endRef = useRef(null);\n\n useEffect(() => {\n endRef.current?.scrollIntoView({ behavior: \"smooth\" });\n }, [messages]);\n\n function submit() {\n const t = text.trim();\n if (!t) return;\n onSend(t);\n setText(\"\");\n }\n\n return (\n

\n {messages.length === 0\n ? (\n

\n Send a message to get started.\n

\n )\n : messages.map((m) => )}\n

\n setText((e.target as HTMLTextAreaElement).value)}\n onKeyDown={(e) => {\n if (e.key === \"Enter\" && !e.shiftKey) {\n e.preventDefault();\n submit();\n }\n }}\n />\n \n {busy ? \"…\" : \"Send\"}\n \n

\n );\n}\n",[],[181,262,264],"f9914d5c-5e97-11f1-9821-1607ee4eb77e","App.tsx","019e88ee-890a-72f8-a279-04f780b271a6",9,["D",1780414224516],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport { api, type Message, type Thread } from \"./api.ts\";\nimport { Chat } from \"./Chat.tsx\";\n\nexport function App() {\n const [threads, setThreads] = useState([]);\n const [currentId, setCurrentId] = useState(null);\n const [messages, setMessages] = useState([]);\n const [busy, setBusy] = useState(false);\n const cursorRef = useRef(0);\n\n async function refreshThreads() {\n try {\n setThreads(await api.listThreads());\n } catch (_e) { /* ignore */ }\n }\n\n useEffect(() => {\n refreshThreads();\n }, []);\n\n function openThread(id: string) {\n setCurrentId(id);\n setMessages([]);\n cursorRef.current = 0;\n }\n\n async function newChat() {\n try {\n const t = await api.createThread();\n await refreshThreads();\n openThread(t.id);\n } catch (_e) { /* ignore */ }\n }\n\n // Poll the open thread for new messages.\n useEffect(() => {\n if (!currentId) return;\n let alive = true;\n async function poll() {\n try {\n const rows = await api.getMessages(currentId!, cursorRef.current);\n if (!alive || rows.length === 0) return;\n cursorRef.current = rows[rows.length - 1].id;\n setMessages((prev) => [...prev.filter((m) => m.id >= 0), ...rows]);\n } catch (_e) { /* ignore */ }\n }\n poll();\n const iv = setInterval(poll, 1000);\n return () => {\n alive = false;\n clearInterval(iv);\n };\n }, [currentId]);\n\n async function send(text: string) {\n if (!currentId) return;\n const optimistic: Message = {\n id: -1,\n thread_id: currentId,\n role: \"user\",\n type: \"text\",\n content: text,\n created_at: new Date().toISOString(),\n };\n setMessages((prev) => [...prev, optimistic]);\n setBusy(true);\n try {\n await api.send(currentId, text);\n } catch (_e) { /* ignore */ }\n setBusy(false);\n refreshThreads();\n }\n\n return (\n

\n \n

\n {currentId\n ? \n : (\n

\n Select a chat or start a new one to talk to your Claude Managed Agent.\n

\n )}\n

\n );\n}\n",[],[181,262,272],"f94de068-5e96-11f1-a008-1607ee4eb77e",["D",1780413794401],[208,209,210],[181,262],["D",1780413794401],[207,211,212,213],[181],"4e1ba8e8-5e9a-11f1-bcc6-1607ee4eb77e","files.ts","2d47e1f0-5e99-11f1-a841-1607ee4eb77e",32,["D",1780415225342],"import Anthropic from \"npm:@anthropic-ai/sdk@0.100.1\";\nimport { blob } from \"https://esm.town/v/std/blob\";\nimport { addMessage, getMessages } from \"./db.ts\";\n\n// Files the agent creates in its sandbox are surfaced via the Managed Agents\n// Files API, scoped to the session: `files.list({ scope_id })` enumerates them\n// (id, filename, mime_type), and `files.download(id)` returns the bytes. Val Town\n// has no filesystem, so we copy each new file into std/blob and record a row.\nconst client = new Anthropic();\nconst BETA = \"managed-agents-2026-04-01\";\n\n// Content payload stored on image/file message rows. The frontend reads `id` to\n// build the /api/files/:id URL, plus `name`/`mime` for display + downloads.\nexport interface FilePayload {\n id: string;\n name: string;\n mime: string;\n}\n\nconst blobKey = (id: string) => `file_${id}`;\n\n// Read the bytes we stashed in blob storage for a served file.\nexport const getFileBytes = (id: string) => blob.get(blobKey(id));\n\n// After a turn, mirror any session files the thread hasn't surfaced yet into blob\n// storage and write an image/file row for each. Images render inline; everything\n// else becomes a download link.\nexport async function syncSessionFiles(threadId: string, sessionId: string) {\n const seen = new Set(\n (await getMessages(threadId, 0))\n .filter((m: any) => m.type === \"image\" || m.type === \"file\")\n .map((m: any) => (JSON.parse(m.content) as FilePayload).id),\n );\n\n const res = await client.beta.files.list(\n { scope_id: sessionId, betas: [BETA] } as any,\n );\n const fresh = (res.data as any[]).filter((f) =>\n f.downloadable !== false && !seen.has(f.id)\n );\n\n await Promise.all(fresh.map(async (f) => {\n const dl = await client.beta.files.download(f.id, { betas: [BETA] } as any);\n const bytes = new Uint8Array(await (dl as any).arrayBuffer());\n await blob.set(blobKey(f.id), bytes);\n const mime: string = f.mime_type ?? \"application/octet-stream\";\n const payload: FilePayload = { id: f.id, name: f.filename ?? f.id, mime };\n const type = mime.startsWith(\"image/\") ? \"image\" : \"file\";\n await addMessage(threadId, \"assistant\", type, JSON.stringify(payload));\n }));\n}",[],[187,287],"402889c8-5e99-11f1-9d27-1607ee4eb77e","db.ts","31cd7692-5e97-11f1-91e4-1607ee4eb77e",21,["D",1780414772440],"import { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\n// A thread = one Managed Agent session. Messages stream into SQLite; the\n// frontend polls for new rows. `config` caches the create-once agent + env ids.\nawait sqlite.batch([\n `CREATE TABLE IF NOT EXISTS config (key TEXT PRIMARY KEY, value TEXT)`,\n `CREATE TABLE IF NOT EXISTS threads (\n id TEXT PRIMARY KEY, session_id TEXT, title TEXT,\n last_cursor TEXT, created_at TEXT DEFAULT CURRENT_TIMESTAMP)`,\n `CREATE TABLE IF NOT EXISTS messages (\n id INTEGER PRIMARY KEY AUTOINCREMENT, thread_id TEXT,\n role TEXT, type TEXT, content TEXT, created_at TEXT DEFAULT CURRENT_TIMESTAMP)`,\n]);\n\nconst one = async (sql: string, args: unknown[] = []) =>\n (await sqlite.execute({ sql, args })).rows[0];\nconst all = async (sql: string, args: unknown[] = []) =>\n (await sqlite.execute({ sql, args })).rows;\n\nexport const getConfig = async (key: string) =>\n (await one(`SELECT value FROM config WHERE key = ?`, [key]))?.value as string | undefined;\nexport const setConfig = (key: string, value: string) =>\n sqlite.execute({ sql: `INSERT OR REPLACE INTO config VALUES (?, ?)`, args: [key, value] });\n\nexport const listThreads = () => all(`SELECT * FROM threads ORDER BY created_at DESC`);\nexport const getThread = (id: string) => one(`SELECT * FROM threads WHERE id = ?`, [id]);\nexport const createThread = (id: string, title: string) =>\n sqlite.execute({ sql: `INSERT INTO threads (id, title) VALUES (?, ?)`, args: [id, title] });\nexport const setTitle = (id: string, title: string) =>\n sqlite.execute({ sql: `UPDATE threads SET title = ? WHERE id = ?`, args: [title, id] });\nexport const setSession = (id: string, sessionId: string) =>\n sqlite.execute({ sql: `UPDATE threads SET session_id = ? WHERE id = ?`, args: [sessionId, id] });\nexport const setCursor = (id: string, cursor: string) =>\n sqlite.execute({ sql: `UPDATE threads SET last_cursor = ? WHERE id = ?`, args: [cursor, id] });\n\nexport const addMessage = (threadId: string, role: string, type: string, content: string) =>\n sqlite.execute({\n sql: `INSERT INTO messages (thread_id, role, type, content) VALUES (?, ?, ?, ?)`,\n args: [threadId, role, type, content],\n });\nexport const getMessages = (threadId: string, after: number) =>\n all(`SELECT * FROM messages WHERE thread_id = ? AND id > ? ORDER BY id`, [threadId, after]);\n\n// Look up the { id, name, mime } payload for a surfaced file row by its file id,\n// so the /api/files/:id route can serve the right Content-Type + filename.\nexport const getFilePayload = async (fileId: string) => {\n const row = await one(\n `SELECT content FROM messages WHERE type IN ('image', 'file')\n AND content LIKE ? ORDER BY id DESC LIMIT 1`,\n [`%${fileId}%`],\n );\n return row ? JSON.parse(row.content as string) as { id: string; name: string; mime: string } : null;\n};\n",[],[187,295],"450214f4-5e9a-11f1-a139-1607ee4eb77e","agent.ts","df88de02-5e97-11f1-a3de-1607ee4eb77e",30,["D",1780415210079],4,"import Anthropic from \"npm:@anthropic-ai/sdk@0.100.1\";\nimport {\n addMessage,\n getConfig,\n setConfig,\n setCursor,\n setSession,\n} from \"./db.ts\";\nimport { syncSessionFiles } from \"./files.ts\";\n\nconst client = new Anthropic();\nconst MODEL = \"claude-opus-4-8\";\nconst SYSTEM =\n \"You are a helpful coding assistant working in a sandbox. Use your tools (bash, file editing, web) to actually do the work, then briefly summarize what you did.\";\n\n// Create the agent + environment ONCE and cache their ids. Agents are versioned\n// configs and sessions pin to a version, so recreating them per request is wrong.\nexport async function ensureConfig() {\n const agentId = await getConfig(\"agent_id\");\n const envId = await getConfig(\"environment_id\");\n if (agentId && envId) return { agentId, envId };\n\n const agent = await client.beta.agents.create({\n name: \"Managed Agent Demo\",\n model: MODEL,\n system: SYSTEM,\n // Built-in toolset runs in Anthropic's sandbox; always_allow = run without prompting.\n tools: [{\n type: \"agent_toolset_20260401\",\n default_config: { permission_policy: { type: \"always_allow\" } },\n }],\n });\n const environment = await client.beta.environments.create({\n name: \"demo-env\",\n config: { type: \"cloud\", networking: { type: \"unrestricted\" } },\n });\n await setConfig(\"agent_id\", agent.id);\n await setConfig(\"environment_id\", environment.id);\n return { agentId: agent.id, envId: environment.id };\n}\n\n// Each thread gets one session, created lazily and reused for follow-up turns.\nexport async function ensureSession(thread: any) {\n if (thread.session_id) return thread.session_id as string;\n const { agentId, envId } = await ensureConfig();\n const session = await client.beta.sessions.create({\n agent: agentId,\n environment_id: envId,\n title: thread.title,\n });\n await setSession(thread.id, session.id);\n return session.id;\n}\n\n// One turn: open the stream, send the message, then persist each event to SQLite\n// until the session goes idle. The frontend polls those rows as they land.\nexport async function runTurn(\n threadId: string,\n sessionId: string,\n text: string,\n) {\n const stream = await client.beta.sessions.events.stream(sessionId);\n await client.beta.sessions.events.send(sessionId, {\n events: [{ type: \"user.message\", content: [{ type: \"text\", text }] }],\n });\n for await (const event of stream) {\n const e = event as any;\n if (e.id) await setCursor(threadId, e.id);\n if (event.type === \"agent.message\") {\n for (const block of e.content) {\n if (block.type === \"text\") {\n await addMessage(threadId, \"assistant\", \"text\", block.text);\n }\n }\n } else if (event.type === \"agent.tool_use\") {\n await addMessage(threadId, \"assistant\", \"tool_use\", e.name);\n } else if (event.type === \"session.error\") {\n await addMessage(\n threadId,\n \"system\",\n \"error\",\n e.error?.message ?? \"session error\",\n );\n break;\n } else if (event.type === \"session.status_idle\") {\n break;\n }\n }\n // Surface any files the agent created in its sandbox this turn (images render\n // inline; other downloadables become links). Best-effort: never fail the turn.\n try {\n await syncSessionFiles(threadId, sessionId);\n } catch (_e) { /* ignore */ }\n}",[],[187,303],["D",1780413889356],[203,204,205],[187],["D",1780413794401],["D",1789495880338],{"_102":101,"_110":106},{"_102":101,"_103":104,"_105":106,"_18":-5,"_107":108,"_109":24},{"_13":88,"_32":89,"_42":41,"_90":43,"_91":92,"_93":94,"_95":49,"_96":97,"_98":64,"_99":44,"_100":101},"ctx",{"_81":-5,"_132":352,"_353":354,"_355":356,"_357":26,"_358":26,"_359":26,"_360":24,"_361":-5,"_362":-7,"_363":-7,"_364":155,"_365":26,"_366":26,"_367":-5,"_368":26,"_369":26,"_370":26,"_371":-5},"ENV",{"_323":324,"_325":326,"_327":89,"_328":329,"_330":331,"_332":333,"_334":335,"_336":337,"_338":339,"_340":341,"_342":343,"_344":345,"_346":347,"_348":349,"_350":351},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

Diff · v33