Initial commit: Open Agent SDK (TypeScript)

Open-source Agent SDK with 30+ built-in tools, MCP integration, multi-turn sessions, subagents, and streaming support. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-27 07:16:21 +09:00 · 2026-04-01 17:51:53 +08:00
commit 67e120b2ed
59 changed files with 9679 additions and 0 deletions
@@ -0,0 +1,87 @@
+/**
+ * Example 7: Custom Tools
+ *
+ * Shows how to define and use custom tools alongside built-in tools.
+ *
+ * Run: npx tsx examples/07-custom-tools.ts
+ */
+import { createAgent, getAllBaseTools, defineTool } from '../src/index.js'
+
+const weatherTool = defineTool({
+  name: 'GetWeather',
+  description: 'Get current weather for a city. Returns temperature and conditions.',
+  inputSchema: {
+    type: 'object',
+    properties: {
+      city: { type: 'string', description: 'City name (e.g., "Tokyo", "London")' },
+    },
+    required: ['city'],
+  },
+  isReadOnly: true,
+  isConcurrencySafe: true,
+  async call(input) {
+    const temps: Record<string, number> = {
+      tokyo: 22, london: 14, beijing: 25, 'new york': 18, paris: 16,
+    }
+    const temp = temps[input.city?.toLowerCase()] ?? 20
+    return `Weather in ${input.city}: ${temp}°C, partly cloudy`
+  },
+})
+
+const calculatorTool = defineTool({
+  name: 'Calculator',
+  description: 'Evaluate a mathematical expression. Use ** for exponentiation.',
+  inputSchema: {
+    type: 'object',
+    properties: {
+      expression: { type: 'string', description: 'Math expression (e.g., "42 * 17 + 3", "2 ** 10")' },
+    },
+    required: ['expression'],
+  },
+  isReadOnly: true,
+  isConcurrencySafe: true,
+  async call(input) {
+    try {
+      const result = Function(`'use strict'; return (${input.expression})`)()
+      return `${input.expression} = ${result}`
+    } catch (e: any) {
+      return { data: `Error: ${e.message}`, is_error: true }
+    }
+  },
+})
+
+async function main() {
+  console.log('--- Example 7: Custom Tools ---\n')
+
+  const builtinTools = getAllBaseTools()
+  const allTools = [...builtinTools, weatherTool, calculatorTool]
+
+  const agent = createAgent({
+    model: process.env.CODEANY_MODEL || 'claude-sonnet-4-6',
+    maxTurns: 10,
+    tools: allTools,
+  })
+
+  console.log(`Loaded ${allTools.length} tools (${builtinTools.length} built-in + 2 custom)\n`)
+
+  for await (const event of agent.query(
+    'What is the weather in Tokyo and London? Also calculate 2**10 * 3. Be brief.',
+  )) {
+    const msg = event as any
+    if (msg.type === 'assistant') {
+      for (const block of msg.message?.content || []) {
+        if (block.type === 'tool_use') {
+          console.log(`[${block.name}] ${JSON.stringify(block.input)}`)
+        }
+        if (block.type === 'text' && block.text.trim()) {
+          console.log(`\n${block.text}`)
+        }
+      }
+    }
+    if (msg.type === 'result') {
+      console.log(`\n--- ${msg.subtype} ---`)
+    }
+  }
+}
+
+main().catch(console.error)