Claude Managed Agent

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We key threads/usage on a stable id (username).\nexport async function requireUser(c: Context): Promise {\n const session = await getOAuthUserData(c.req.raw);\n const u = session?.user;\n if (!u) return null;\n const username = u.username as string;\n return { id: String(u.id ?? username), username };\n}\n\n// How many user-role messages this user has sent (across all their threads).\nexport const countUsage = (userId: string) => db.countUserMessages(userId);\n","createdAt",["D",1780416328492],"branchVersion","branchId","f94618ba-5e96-11f1-a008-1607ee4eb77e","id","f93e0bca-5e96-11f1-a008-1607ee4eb77e","claude-managed-agents-ui",["D",1780413794401],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Interactive chat UI for a Claude Managed Agent","imageUrl","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/7bf29dd7-9190-4de2-045f-8245c9e11100/square512?exp=1789567199&sig=40a2e59532fa7b2437b2e1b66df55ec17ad5fc55f46e74002bc693afcf654672","a0bf3b31-15a5-4d5c-880e-4b1e22c9bc18","pinnedFileId","019e88ee-890a-72f8-a279-25160d2a5b36","pinPreview",true,"pinMigrated","screenshotVersion","likeCount",1,"orgId","019aa807-52c2-709c-928b-2029bae9a558","tursoName","f93e0bca5e9611f1a0081607ee4eb77e","tursoHostname","f93e0bca5e9611f1a0081607ee4eb77e-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789495880338],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_103":102,"_111":107},"org",{"_103":102,"_104":105,"_106":107,"_18":-5,"_108":109,"_110":59},"branch",{"_13":89,"_31":90,"_42":41,"_91":43,"_92":93,"_94":95,"_96":49,"_97":98,"_99":65,"_100":44,"_101":102},"isOwned",121,"main","projectId","forkedBranchId","961078ea-f528-11ef-aa68-569c3dd06744","forkedBranchVersion",89,"forkedProjectPrivacy","forkedProjectId","96102714-f528-11ef-aa68-569c3dd06744","forkedProjectOrgId","projectName","userHandle","templates","handle","displayName","Templates","avatar","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/129cab32-3bd7-4c3e-f39b-f12900c76100/square512?exp=1789567199&sig=d8af4f1d5d6ef07a152f6225f86a0227f22fe92650a7f9572d94a5f64256bba9","tier","business","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_42":43,"_31":44,"_37":309,"_46":-5,"_47":24,"_48":49,"_50":49,"_51":52,"_53":54,"_18":55,"_56":57,"_58":59,"_60":-5,"_61":-5,"_62":63,"_64":65,"_66":67,"_68":69,"_70":310,"_72":-5,"_73":74,"_75":74,"_76":77,"_78":77,"_79":77,"_80":74,"_81":74,"_82":311,"_84":312,"_86":313,"_88":24},"tree",[192,198,206,207],"files",[192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207],"counts",{"_182":173,"_183":63,"_184":63,"_185":186,"_187":188},"contents",[146,147,148,149],"upstreamProject",{"_42":98,"_31":142,"_51":143,"_53":144,"_48":49,"_82":145},"upstreamBranch",{"_42":93,"_37":136,"_137":138,"_31":90,"_91":98,"_13":139,"_92":-5,"_94":-5,"_140":141,"_46":-5,"_88":24,"_48":49,"_101":102,"_64":65,"_100":142},"emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},["D",1740674013689],"updatedAt",["D",1785420707976],91,"lockfileKey","1785420708123-esm.town_v_templates_react-hono-starter@91-main","react-hono-starter","Starter template with client-side React & Hono server","https://imagedelivery.net/iHX6Ovru0O7AjmyT5yZRoA/64dc00cc-94d9-47dd-81b1-dde02610d900/square512?exp=1789567199&sig=be2da3e537d6269cefeedcb88843ac66f83d7a4623f50e71633938e44918ec3c",{"_103":102,"_111":107},{"_42":176,"_31":177,"_29":178,"_152":-5,"_40":41,"_39":179,"_154":59,"_37":180,"_13":173,"_33":174,"_35":-5,"_23":24,"_159":-5,"_26":181},{"_42":169,"_31":170,"_29":171,"_152":-5,"_40":41,"_39":63,"_154":59,"_37":172,"_13":173,"_33":174,"_35":-5,"_23":24,"_159":-5,"_26":175},{"_42":161,"_31":162,"_29":163,"_152":-5,"_40":41,"_39":164,"_154":59,"_37":165,"_13":166,"_33":20,"_35":167,"_23":24,"_159":-5,"_26":168},{"_42":150,"_31":151,"_29":57,"_152":-5,"_40":41,"_39":153,"_154":24,"_37":155,"_13":156,"_33":157,"_35":158,"_23":24,"_159":44,"_26":160},"3bf65740-5e99-11f1-ba7b-1607ee4eb77e","index.ts","parentId",20,"latest",["D",1780414765404],3,"http","import { 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","label",[151],"b8f407a0-5e9a-11f1-af60-1607ee4eb77e","README.md","019e88ee-890a-72f8-a279-21928a58e16f",35,["D",1780415404602],4,"# 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\nsandbox with bash, file editing, and web tools. Hono (backend) + React\n(frontend), with Val Town SQLite for storage.\n\nWhere\n[`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**\n (lazily on first use) and their ids are cached in a `config` row — sessions\n pin to an agent version, so recreating them per request would be wrong. Each\n thread makes 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\n a session, then **opens the event stream, sends the message, and writes each\n event to SQLite as it arrives** (`agent.message` → text, `agent.tool_use` →\n tool name, `session.error` → error), returning when the session goes idle.\n- The **frontend polls** `GET /api/threads/:id/messages?after=` about\n once a 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\n turn. When the session goes idle, `backend/files.ts` lists the session's files\n via the Managed Agents Files API (`files.list({ scope_id })`), downloads any\n new ones (`files.download(id)`), stashes the bytes in `std/blob` (key\n `file_`), and writes a `messages` row for each — `type: \"image\"` for\n `image/*`, else `type: \"file\"`. The row's `content` is JSON\n `{ id, name, mime }`. The frontend renders images inline and other files as a\n `⬇ name` download link, both pointing at `GET /api/files/:id`, which streams\n 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\nprompt in `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,\n per-turn streaming\n- `backend/files.ts` — surface sandbox files: Files API → `std/blob` →\n 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.\n If it dies before `session.status_idle`, reopen the stream and replay events\n for that `session_id` from the thread's `last_cursor` to resume writing to\n SQLite — session 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.",[162],"f94df35a-5e96-11f1-a008-1607ee4eb77e","frontend","019e88ee-890a-72f8-a279-1cf939beedf1",["D",1780413794401],0,"directory",[170],"31cdaeaa-5e97-11f1-91e4-1607ee4eb77e","backend","d776a2ad-ff3e-4481-8dd0-5ebd71580eb6",2,["D",1780413889356],[177],"pulls","branches","forks","envVars",{"_189":63,"_191":173},"connections",{"_189":173,"_190":173},"count","unfilledCount","emptyCount",{"_42":176,"_31":177,"_29":178,"_152":-5,"_40":41,"_39":179,"_154":59,"_37":306,"_13":173,"_33":174,"_35":-5,"_23":24,"_159":-5,"_209":307,"_26":308},{"_42":298,"_31":299,"_29":300,"_152":178,"_40":41,"_39":301,"_154":24,"_37":302,"_13":63,"_33":34,"_35":303,"_23":24,"_159":-5,"_209":304,"_26":305},{"_42":290,"_31":291,"_29":292,"_152":178,"_40":41,"_39":293,"_154":24,"_37":294,"_13":166,"_33":34,"_35":295,"_23":24,"_159":-5,"_209":296,"_26":297},{"_42":286,"_31":32,"_29":30,"_152":178,"_40":41,"_39":14,"_154":59,"_37":287,"_13":173,"_33":34,"_35":36,"_23":24,"_159":-5,"_209":288,"_26":289},{"_42":278,"_31":279,"_29":280,"_152":178,"_40":41,"_39":281,"_154":24,"_37":282,"_13":63,"_33":34,"_35":283,"_23":24,"_159":-5,"_209":284,"_26":285},{"_42":270,"_31":271,"_29":272,"_152":178,"_40":41,"_39":273,"_154":24,"_37":274,"_13":63,"_33":34,"_35":275,"_23":24,"_159":-5,"_209":276,"_26":277},{"_42":169,"_31":170,"_29":171,"_152":-5,"_40":41,"_39":63,"_154":59,"_37":267,"_13":173,"_33":174,"_35":-5,"_23":24,"_159":-5,"_209":268,"_26":269},{"_42":263,"_31":246,"_29":240,"_152":171,"_40":41,"_39":63,"_154":59,"_37":264,"_13":173,"_33":174,"_35":-5,"_23":24,"_159":-5,"_209":265,"_26":266},{"_42":255,"_31":256,"_29":257,"_152":240,"_40":41,"_39":258,"_154":24,"_37":259,"_13":63,"_33":34,"_35":260,"_23":24,"_159":-5,"_209":261,"_26":262},{"_42":247,"_31":248,"_29":249,"_152":240,"_40":41,"_39":250,"_154":24,"_37":251,"_13":63,"_33":34,"_35":252,"_23":24,"_159":-5,"_209":253,"_26":254},{"_42":237,"_31":238,"_29":239,"_152":240,"_40":41,"_39":241,"_154":59,"_37":242,"_13":179,"_33":34,"_35":243,"_23":24,"_159":-5,"_209":244,"_26":245},{"_42":230,"_31":231,"_29":232,"_152":171,"_40":41,"_39":63,"_154":24,"_37":233,"_13":173,"_33":20,"_35":234,"_23":24,"_159":-5,"_209":235,"_26":236},{"_42":222,"_31":223,"_29":224,"_152":171,"_40":41,"_39":225,"_154":24,"_37":226,"_13":63,"_33":20,"_35":227,"_23":24,"_159":-5,"_209":228,"_26":229},{"_42":215,"_31":216,"_29":217,"_152":171,"_40":41,"_39":63,"_154":59,"_37":218,"_13":173,"_33":34,"_35":219,"_23":24,"_159":-5,"_209":220,"_26":221},{"_42":161,"_31":162,"_29":163,"_152":-5,"_40":41,"_39":164,"_154":59,"_37":212,"_13":166,"_33":20,"_35":167,"_23":24,"_159":-5,"_209":213,"_26":214},{"_42":150,"_31":151,"_29":57,"_152":-5,"_40":41,"_39":153,"_154":24,"_37":208,"_13":156,"_33":157,"_35":158,"_23":24,"_159":44,"_209":210,"_26":211},["D",1780414765404],"children",[],[151],["D",1780415404602],[],[162],"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();",[],[170,216],"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",[],[170,223],"f94de36a-5e96-11f1-a008-1607ee4eb77e","favicon.svg","019e88ee-890a-72f8-a279-127b4bb2ba62",["D",1780413794401],"\n",[],[170,231],"dd36236c-5e9c-11f1-8f62-1607ee4eb77e","api.ts","e8672b46-5e97-11f1-a823-1607ee4eb77e","019e88ee-890a-72f8-a279-0d2bca618dcd",40,["D",1780416324362],"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 // content varies by type:\n // text → plain text\n // tool_use → JSON string { name, input }\n // tool_result → JSON string { output, is_error? }\n // image → JSON string { id, name, mime } (served at /api/files/)\n // file → JSON string { id, name, mime } (download at /api/files/)\n // error → plain text (rendered red)\n type: \"text\" | \"tool_use\" | \"tool_result\" | \"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\nexport interface Me {\n username: string;\n used: number;\n limit: number;\n remaining: number;\n}\n\n// Thrown when an /api/* call returns 401 — the caller should show the login screen.\nexport class UnauthorizedError extends Error {\n constructor() {\n super(\"unauthorized\");\n this.name = \"UnauthorizedError\";\n }\n}\n\n// Thrown when a send hits the demo limit (HTTP 429).\nexport class LimitError extends Error {\n remaining: number;\n constructor(message: string, remaining: number) {\n super(message);\n this.name = \"LimitError\";\n this.remaining = remaining;\n }\n}\n\nasync function json(res: Response): Promise {\n if (res.status === 401) throw new UnauthorizedError();\n if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);\n return res.json() as Promise;\n}\n\nexport const api = {\n // Returns the logged-in user + usage. Throws UnauthorizedError when not logged in.\n me(): Promise {\n return fetch(\"/api/me\").then((r) => json(r));\n },\n listThreads(): Promise {\n return fetch(\"/api/threads\").then((r) => json(r));\n },\n createThread(): Promise {\n return fetch(\"/api/threads\", { method: \"POST\" }).then((r) => json(r));\n },\n getMessages(threadId: string, after: number): Promise {\n return fetch(`/api/threads/${threadId}/messages?after=${after}`).then((r) =>\n json(r)\n );\n },\n // Stays open the whole turn. Resolves { ok: true }; throws LimitError on HTTP 429.\n async send(threadId: string, text: string): Promise<{ ok: true }> {\n const res = await fetch(`/api/threads/${threadId}/messages`, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({ text }),\n });\n if (res.status === 401) throw new UnauthorizedError();\n if (res.status === 429) {\n const body = await res.json().catch(() => ({})) as {\n error?: string;\n remaining?: number;\n };\n throw new LimitError(\n body.error ?? \"You've reached the demo message limit.\",\n body.remaining ?? 0,\n );\n }\n if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);\n return res.json() as Promise<{ ok: true }>;\n },\n async logout(): Promise {\n await fetch(\"/auth/logout\", { method: \"POST\" }).catch(() => {});\n },\n};\n\nexport const SOURCE_VAL_URL = \"https://www.val.town/x/templates/claude-managed-agents-ui\";\n",[],[170,246,238],"components","48855664-5e99-11f1-8734-1607ee4eb77e","Chat.tsx","f078aca6-5e97-11f1-bd0e-1607ee4eb77e",23,["D",1780414786474],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport type { FilePayload, Message } from \"./api.ts\";\n\nfunction MessageRow({ m }: { m: Message }) {\n // Files the agent created in its sandbox: images inline, others as a download.\n if (m.type === \"image\" || m.type === \"file\") {\n const f = JSON.parse(m.content) as FilePayload;\n const url = `/api/files/${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",[],[170,246,248],"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",[],[170,246,256],"f94de068-5e96-11f1-a008-1607ee4eb77e",["D",1780413794401],[200,201,202],[170,246],["D",1780413794401],[199,203,204,205],[170],"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}",[],[177,271],"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",[],[177,279],"dfa1bae4-5e9c-11f1-ae30-1607ee4eb77e",["D",1780416328492],[],[177,32],"450214f4-5e9a-11f1-a139-1607ee4eb77e","agent.ts","df88de02-5e97-11f1-a3de-1607ee4eb77e",30,["D",1780415210079],"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}",[],[177,291],"d349ef78-5e9c-11f1-8146-1607ee4eb77e","_probe.ts","c83d9d82-5e9c-11f1-804e-1607ee4eb77e",39,["D",1780416307778],"import Anthropic from \"npm:@anthropic-ai/sdk@0.100.1\";\nimport { blob } from \"https://esm.town/v/std/blob\";\nimport { ensureConfig } from \"./agent.ts\";\n\nconst client = new Anthropic();\nconst BETA = \"managed-agents-2026-04-01\";\n\nexport default async function () {\n const log: any[] = [];\n const { agentId, envId } = await ensureConfig();\n log.push({ agentId, envId });\n\n const session = await client.beta.sessions.create({\n agent: agentId,\n environment_id: envId,\n title: \"probe\",\n });\n const sessionId = session.id;\n log.push({ sessionId });\n\n const stream = await client.beta.sessions.events.stream(sessionId);\n await client.beta.sessions.events.send(sessionId, {\n events: [{\n type: \"user.message\",\n content: [{\n type: \"text\",\n text:\n \"Use python with matplotlib to make a simple bar chart and save it to /tmp/chart.png. Then tell me you're done.\",\n }],\n }],\n });\n\n const eventTypes: Record = {};\n let toolResultSample: any = null;\n let toolUseSample: any = null;\n for await (const event of stream) {\n const e = event as any;\n eventTypes[event.type] = (eventTypes[event.type] ?? 0) + 1;\n if (event.type === \"agent.tool_result\" && !toolResultSample) {\n toolResultSample = JSON.parse(JSON.stringify(e));\n }\n if (event.type === \"agent.tool_use\" && !toolUseSample) {\n toolUseSample = JSON.parse(JSON.stringify(e));\n }\n if (event.type === \"session.error\") {\n log.push({ sessionError: e.error });\n break;\n }\n if (event.type === \"session.status_idle\") break;\n }\n log.push({ eventTypes });\n log.push({ toolUseSample });\n log.push({ toolResultSample });\n\n // Files API roundtrip\n let listData: any[] = [];\n for (let i = 0; i < 4; i++) {\n const res = await client.beta.files.list({ scope_id: sessionId, betas: [BETA] } as any);\n listData = res.data as any[];\n log.push({ attempt: i, listCount: listData.length, list: listData });\n if (listData.length > 0) break;\n await new Promise((r) => setTimeout(r, 1500));\n }\n\n if (listData.length > 0) {\n const f = listData[0];\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 log.push({ downloadedBytes: bytes.length, id: f.id });\n await blob.set(`file_${f.id}`, bytes);\n const keys = await blob.list(\"file_\");\n log.push({ blobKeys: (keys as any[]).map((k: any) => k.key) });\n const back = await blob.get(`file_${f.id}`);\n const backBytes = new Uint8Array(await (back as any).arrayBuffer());\n log.push({ readBackBytes: backBytes.length });\n // cleanup probe blob\n await blob.delete(`file_${f.id}`);\n }\n\n console.log(JSON.stringify(log, null, 2));\n return { ok: true, n: log.length };\n}\n",[],[177,299],["D",1780413889356],[193,194,195,196,197],[177],["D",1780413794401],["D",1789495880338],{"_103":102,"_111":107},{"_103":102,"_104":105,"_106":107,"_18":-5,"_108":109,"_110":59},{"_13":89,"_31":90,"_42":41,"_91":43,"_92":93,"_94":95,"_96":49,"_97":98,"_99":65,"_100":44,"_101":102},"ctx",{"_82":-5,"_133":347,"_348":349,"_350":351,"_352":24,"_353":24,"_354":24,"_355":59,"_356":-5,"_357":-7,"_358":-7,"_359":173,"_360":24,"_361":24,"_362":-5,"_363":24,"_364":24,"_365":24,"_366":-5},"ENV",{"_318":319,"_320":321,"_322":90,"_323":324,"_325":326,"_327":328,"_329":330,"_331":332,"_333":334,"_335":336,"_337":338,"_339":340,"_341":342,"_343":344,"_345":346},"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 · v41