Hatter: The Cognitive Engine

Session:

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Describe a complex goal, and it will forge the tools to achieve it.

`;\n}\n\n// --- HONO APPLICATION ---\nconst app = new Hono();\napp.get(\"/\", (c) => c.html(html(new URL(c.req.url).origin)));\n\napp.get(\"/api/tools/:sessionId\", async (c) => {\n const sessionId = c.req.param(\"sessionId\");\n if (!sessionId) return c.json({ error: \"Session ID is required\" }, 400);\n const dynamicTools = await S.getDynamicTools(sessionId);\n const allTools = {};\n nativeTools.forEach((t) =>\n allTools[t.function.name] = { native: true, ...t.function }\n );\n Object.assign(allTools, dynamicTools);\n return c.json(allTools);\n});\n\napp.post(\"/api/plan\", async (c) => {\n const { goal, ctx } = await c.req.json();\n if (!goal || !ctx?.sessionId) {\n return c.json({ error: \"goal and ctx.sessionId required\" }, 400);\n }\n\n return streamText(c, async (s) => {\n try {\n // STAGE 1: Architect Drafts a Plan\n await sEv(s, \"status\", { message: \"Architect 🧠 is drafting a plan...\" });\n const dynamicTools = await S.getDynamicTools(ctx.sessionId);\n const dynamicToolDefs = Object.entries(dynamicTools).map((\n [name, tool],\n ) => ({\n type: \"function\",\n function: {\n name: \"exec_prompt_tool\",\n description: `Executes '${name}': ${tool.description}`,\n parameters: {\n type: \"object\",\n properties: {\n tool_name: { type: \"string\", enum: [name] },\n inputs: {\n type: \"object\",\n properties: tool.inputs.reduce(\n (acc, cur) => ({ ...acc, [cur]: { type: \"string\" } }),\n {},\n ),\n required: tool.inputs,\n },\n },\n required: [\"tool_name\", \"inputs\"],\n },\n },\n }));\n const allTools = [...nativeTools, ...dynamicToolDefs];\n const draftMsg = await S._call(C.p.ARCHITECT, `Goal: \"${goal}\"`, {\n tools: allTools,\n });\n const draftCalls = draftMsg.tool_calls;\n if (!draftCalls?.length) {\n throw new Error(\"Architect failed to draft a plan.\");\n }\n const draftPlan = draftCalls.map((call, i) => ({\n step: i + 1,\n tool: call.function.name,\n arguments: jParse(call.function.arguments).d,\n }));\n await sEv(s, \"draft_plan\", { plan: draftPlan });\n\n // STAGE 2: Strategist Critiques the Plan\n await sEv(s, \"status\", {\n message: \"Strategist 🧐 is reviewing the plan...\",\n });\n const criticMsg = await S._call(C.p.STRATEGIST, {\n goal,\n tools: allTools.map((t) => t.function),\n draft_plan: draftPlan,\n }, { isJson: true, model: C.m.minor });\n const { d: criticData, e: criticErr } = jParse(criticMsg.content);\n if (criticErr) throw new Error(\"Strategist returned invalid critique.\");\n await sEv(s, \"critique\", { critique: criticData.critique });\n\n // STAGE 3: Architect Creates the Final Plan\n await sEv(s, \"status\", {\n message: \"Architect 🧠 is revising the plan based on feedback...\",\n });\n const finalMsg = await S._call(\n C.p.ARCHITECT,\n `Goal: \"${goal}\"\\n\\nCritique of your first draft: \"${criticData.critique}\"\\n\\nPlease provide a final, improved plan.`,\n { tools: allTools },\n );\n const finalCalls = finalMsg.tool_calls;\n if (!finalCalls?.length) {\n throw new Error(\"Architect failed to create a final plan.\");\n }\n const finalPlan = finalCalls.map((call, i) => ({\n step: i + 1,\n tool: call.function.name,\n arguments: jParse(call.function.arguments).d,\n }));\n await sEv(s, \"final_plan\", { plan: finalPlan });\n\n // STAGE 4: Execute the Final Plan\n await sEv(s, \"execution_start\", { plan: finalPlan });\n const pExec = runPlan(finalPlan, ctx);\n let final_result;\n for await (const ev of pExec) {\n if (ev.type === \"result\" && ev.data.step === finalPlan.length) {\n final_result = ev.data.output;\n }\n await sEv(s, `exec_${ev.type}`, ev.data);\n }\n await sEv(s, \"final\", {\n message: \"Workflow complete.\",\n final: final_result,\n });\n } catch (e) {\n console.error(\"Cognitive loop failed:\", e);\n await sEv(s, \"error\", { message: e.message });\n }\n });\n});\n\nexport default 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