Roll Your Own Agent

[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_224":225,"_226":227},"routes/_app.x.$handle.$name",{"_105":104,"_32":45,"_113":91,"_27":114,"_13":14,"_115":-5,"_11":116,"_117":118,"_119":120,"_121":122,"_123":124,"_20":-5,"_125":126,"_127":128,"_129":25,"_130":131,"_132":60,"_133":-5,"_134":-5,"_135":136},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_43":44,"_32":45,"_38":46,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":53,"_54":55,"_18":56,"_57":58,"_59":60,"_61":-5,"_62":-5,"_63":64,"_65":66,"_67":68,"_69":70,"_71":72,"_73":-5,"_74":75,"_76":75,"_77":78,"_79":78,"_80":78,"_81":75,"_82":75,"_83":84,"_85":86,"_87":88,"_89":25},"version",109,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":34,"_35":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous",{"_30":31,"_32":28,"_33":34,"_35":36},"deleted",false,"deletedHere","path","main.ts","latestPath","fileId","019e7201-5abb-71b8-9a76-c6df450bef85","name","fileType","script","content","// This is the main script for the self-editing tool that utilizes OpenAI's API and allows dynamic updates to its own source code.\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\n\nconst openai = new OpenAI();\n\n// Val identity — used by the self-edit tools\nconst VAL_ID = \"68615b0c-5b17-11f1-93b5-ee650bb23af1\";\nconst VAL_FILE = \"main.ts\";\nconst ESM_URL = `https://esm.town/v/cookiemonster0921/roll-your-own-agent/${VAL_FILE}`;\nconst FILES_URL = `https://api.val.town/v2/vals/${VAL_ID}/files?path=${VAL_FILE}`;\n\nasync function readOwnCode(): Promise {\n // esm.town serves the raw source — no auth needed\n const res = await fetch(ESM_URL);\n if (!res.ok) return `Error reading code: ${res.status} ${await res.text()}`;\n return await res.text();\n}\n\nasync function editOwnCode(newCode: string): Promise {\n const token = Deno.env.get(\"valtown\");\n if (!token) return \"Error: valtown env var not set — cannot authenticate.\";\n const res = await fetch(FILES_URL, {\n method: \"PUT\",\n headers: {\n Authorization: `Bearer ${token}`,\n \"Content-Type\": \"text/plain\",\n },\n body: newCode,\n });\n if (res.ok) return \"Code updated successfully.\";\n const body = await res.text();\n return `Error updating code (${res.status}): ${body}`;\n}\n\nconst tools = [\n {\n type: \"function\",\n function: {\n name: \"fetch_url\",\n description: \"Fetch the text of a URL (truncated to 2000 chars).\",\n parameters: {\n type: \"object\",\n properties: {\n url: { type: \"string\", description: \"The URL to fetch\" },\n },\n required: [\"url\"],\n },\n },\n },\n {\n type: \"function\",\n function: {\n name: \"read_own_code\",\n description:\n \"Read the current source code of this agent (main.ts). Call this before editing so you have the full file.\",\n parameters: { type: \"object\", properties: {}, required: [] },\n },\n },\n {\n type: \"function\",\n function: {\n name: \"edit_own_code\",\n description:\n \"Replace main.ts with new TypeScript source. Always call read_own_code first, make your changes to the full text, then pass the complete updated file here. Partial diffs are not accepted — the whole file must be provided.\",\n parameters: {\n type: \"object\",\n properties: {\n code: {\n type: \"string\",\n description: \"The complete new source code to write to main.ts\",\n },\n },\n required: [\"code\"],\n },\n },\n },\n];\n\nconst messages: any[] = [\n {\n role: \"user\",\n content: \"Top story on Hacker News now?\",\n },\n];\n\nwhile (true) {\n const res = await openai.chat.completions.create({ messages, tools });\n const msg = res.choices[0].message;\n messages.push(msg);\n if (!msg.tool_calls?.length) break;\n\n for (const { function: func, id } of msg.tool_calls) {\n const args = JSON.parse(func.arguments);\n let content: string;\n\n switch (func.name) {\n case \"fetch_url\":\n content = (await (await fetch(args.url)).text()).slice(0, 2000);\n break;\n case \"read_own_code\":\n content = await readOwnCode();\n break;\n case \"edit_own_code\":\n content = await editOwnCode(args.code);\n break;\n default:\n content = `Unknown tool: ${func.name}`;\n }\n\n messages.push({ role: \"tool\", tool_call_id: id, content });\n }\n}\n\nconsole.log(JSON.stringify(messages, null, 2));\n","// This is the main script for the self-editing tool that utilizes OpenAI's API and allows dynamic updates to its own source code.\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\n\nconst openai = new OpenAI();\n\n// Val identity — used by the self-edit tools\nconst VAL_ID = \"68615b0c-5abb-71b8-9a76-c6df450bef85\";\nconst VAL_FILE = \"main.ts\";\nconst ESM_URL = `https://esm.town/v/cookiemonster0921/roll-your-own-agent/${VAL_FILE}`;\nconst FILES_URL = `https://api.val.town/v2/vals/${VAL_ID}/files?path=${VAL_FILE}`;\n\nasync function readOwnCode(): Promise {\n // esm.town serves the raw source — no auth needed\n const res = await fetch(ESM_URL);\n if (!res.ok) return `Error reading code: ${res.status} ${await res.text()}`;\n return await res.text();\n}\n\nasync function editOwnCode(newCode: string): Promise {\n const token = Deno.env.get(\"valtown\");\n if (!token) return \"Error: valtown env var not set — cannot authenticate.\";\n const res = await fetch(FILES_URL, {\n method: \"PUT\",\n headers: {\n Authorization: `Bearer ${token}`,\n \"Content-Type\": \"text/plain\",\n },\n body: newCode,\n });\n if (res.ok) return \"Code updated successfully.\";\n const body = await res.text();\n return `Error updating code (${res.status}): ${body}`;\n}\n\nconst tools = [\n {\n type: \"function\",\n function: {\n name: \"fetch_url\",\n description: \"Fetch the text of a URL (truncated to 2000 chars).\",\n parameters: {\n type: \"object\",\n properties: {\n url: { type: \"string\", description: \"The URL to fetch\" },\n },\n required: [\"url\"],\n },\n },\n },\n {\n type: \"function\",\n function: {\n name: \"read_own_code\",\n description:\n \"Read the current source code of this agent (main.ts). Call this before editing so you have the full file.\",\n parameters: { type: \"object\", properties: {}, required: [] },\n },\n },\n {\n type: \"function\",\n function: {\n name: \"edit_own_code\",\n description:\n \"Replace main.ts with new TypeScript source. Always call read_own_code first, make your changes to the full text, then pass the complete updated file here. Partial diffs are not accepted — the whole file must be provided.\",\n parameters: {\n type: \"object\",\n properties: {\n code: {\n type: \"string\",\n description: \"The complete new source code to write to main.ts\",\n },\n },\n required: [\"code\"],\n },\n },\n },\n];\n\nconst messages: any[] = [\n {\n role: \"user\",\n content: \"Top story on Hacker News now?\",\n },\n];\n\nwhile (true) {\n const res = await openai.chat.completions.create({ messages, tools });\n const msg = res.choices[0].message;\n messages.push(msg);\n if (!msg.tool_calls?.length) break;\n\n for (const { function: func, id } of msg.tool_calls) {\n const args = JSON.parse(func.arguments);\n let content: string;\n\n switch (func.name) {\n case \"fetch_url\":\n content = (await (await fetch(args.url)).text()).slice(0, 2000);\n break;\n case \"read_own_code\":\n content = await readOwnCode();\n break;\n case \"edit_own_code\":\n content = await editOwnCode(args.code);\n break;\n default:\n content = `Unknown tool: ${func.name}`;\n }\n\n messages.push({ role: \"tool\", tool_call_id: id, content });\n }\n}\n\nconsole.log(JSON.stringify(messages, null, 2));\n","createdAt",["D",1783212622764],"branchVersion","branchId","6867c6ae-5b17-11f1-93b5-ee650bb23af1","id","68615b0c-5b17-11f1-93b5-ee650bb23af1","roll-your-own-agent",["D",1780029151862],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","A tiny LLM agent in ~30 lines, inspired by 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{ sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\nimport { isPaused, readJournal, setPaused, step } from \"./agent-core.ts\";\n\n// ── System prompt for the interactive chat ──────────────────────────────────\nconst SYSTEM_PROMPT = 'You are the chat-facing interface of a self-improving Val Town agent.\\n'\n + 'You have tools to fetch URLs, search the web, and list/read/write/delete files in your own Val Town project, plus a persistent journal (read_journal / write_journal). A separate daily cycle (daily.ts) uses these same tools to autonomously improve this project once per day — you can use them right now too if the user asks you to make changes, add features, or fix bugs.\\n'\n + 'daily.ts is protected and cannot be edited or deleted. Other files (including this one, index.ts, and agent-core.ts) can be rewritten — after any write, the live app is checked and reverted automatically if it breaks. Be direct: if the user asks you to do something, just do it with your tools rather than just describing it.';\n\n// ── HTML shell ────────────────────────────────────────────────────────────────\nconst HTML = '\\n\\n\\n'\n + ' \\n' \n + ' \\n' \n + ' Roll Your Own Agent\\n' \n + ' \\n' +\n + ' \\n' \n + ' \\n' \n + ' \\n'\n + ' \\n' +\n + ' \\n' + \n + '

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