chore: import upstream snapshot with attribution
This commit is contained in:
wehub-resource-sync
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# Agent SDK Patterns — Python
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## Basic Agent
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, ResultMessage
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async def main():
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async for message in query(
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prompt="Explain what this repository does",
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options=ClaudeAgentOptions(
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cwd="/path/to/project",
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allowed_tools=["Read", "Glob", "Grep"]
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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---
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## Custom Tools
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Custom tools require an MCP server. Use `ClaudeSDKClient` for full control (custom SDK MCP tools require `ClaudeSDKClient` — `query()` only supports external stdio/http MCP servers).
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```python
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import anyio
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from claude_agent_sdk import (
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tool,
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create_sdk_mcp_server,
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ClaudeSDKClient,
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ClaudeAgentOptions,
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AssistantMessage,
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TextBlock,
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)
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@tool("get_weather", "Get the current weather for a location", {"location": str})
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async def get_weather(args):
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location = args["location"]
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return {"content": [{"type": "text", "text": f"The weather in {location} is sunny and 72°F."}]}
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server = create_sdk_mcp_server("weather-tools", tools=[get_weather])
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async def main():
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options = ClaudeAgentOptions(mcp_servers={"weather": server})
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async with ClaudeSDKClient(options=options) as client:
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await client.query("What's the weather in Paris?")
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async for message in client.receive_response():
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if isinstance(message, AssistantMessage):
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for block in message.content:
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if isinstance(block, TextBlock):
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print(block.text)
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anyio.run(main)
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```
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---
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## Hooks
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### After Tool Use Hook
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Log file changes after any edit:
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```python
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import anyio
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from datetime import datetime
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from claude_agent_sdk import query, ClaudeAgentOptions, HookMatcher, ResultMessage
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async def log_file_change(input_data, tool_use_id, context):
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file_path = input_data.get('tool_input', {}).get('file_path', 'unknown')
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with open('./audit.log', 'a') as f:
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f.write(f"{datetime.now()}: modified {file_path}\n")
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return {}
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async def main():
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async for message in query(
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prompt="Refactor utils.py to improve readability",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Edit", "Write"],
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permission_mode="acceptEdits",
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hooks={
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"PostToolUse": [HookMatcher(matcher="Edit|Write", hooks=[log_file_change])]
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}
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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---
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## Subagents
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, AgentDefinition, ResultMessage
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async def main():
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async for message in query(
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prompt="Use the code-reviewer agent to review this codebase",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Glob", "Grep", "Agent"],
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agents={
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"code-reviewer": AgentDefinition(
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description="Expert code reviewer for quality and security reviews.",
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prompt="Analyze code quality and suggest improvements.",
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tools=["Read", "Glob", "Grep"]
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)
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}
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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---
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## MCP Server Integration
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### Browser Automation (Playwright)
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, ResultMessage
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async def main():
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async for message in query(
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prompt="Open example.com and describe what you see",
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options=ClaudeAgentOptions(
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mcp_servers={
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"playwright": {"command": "npx", "args": ["@playwright/mcp@latest"]}
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}
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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### Database Access (PostgreSQL)
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```python
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import os
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, ResultMessage
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async def main():
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async for message in query(
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prompt="Show me the top 10 users by order count",
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options=ClaudeAgentOptions(
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mcp_servers={
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"postgres": {
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"command": "npx",
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"args": ["-y", "@modelcontextprotocol/server-postgres"],
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"env": {"DATABASE_URL": os.environ["DATABASE_URL"]}
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}
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}
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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---
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## Permission Modes
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions
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async def main():
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# Default: prompt for dangerous operations
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async for message in query(
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prompt="Delete all test files",
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options=ClaudeAgentOptions(
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allowed_tools=["Bash"],
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permission_mode="default" # Will prompt before deleting
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)
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):
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pass
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# Plan: agent creates a plan before making changes
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async for message in query(
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prompt="Refactor the auth system",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Edit"],
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permission_mode="plan"
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)
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):
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pass
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# Accept edits: auto-accept file edits
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async for message in query(
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prompt="Refactor this module",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Edit"],
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permission_mode="acceptEdits"
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)
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):
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pass
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# Bypass: skip all prompts (use with caution)
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async for message in query(
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prompt="Set up the development environment",
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options=ClaudeAgentOptions(
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allowed_tools=["Bash", "Write"],
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permission_mode="bypassPermissions"
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)
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):
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pass
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anyio.run(main)
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```
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---
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## Error Recovery
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```python
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import anyio
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from claude_agent_sdk import (
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query,
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ClaudeAgentOptions,
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CLINotFoundError,
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CLIConnectionError,
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ProcessError,
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ResultMessage,
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)
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async def run_with_recovery():
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try:
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async for message in query(
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prompt="Fix the failing tests",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Edit", "Bash"],
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max_turns=10
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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except CLINotFoundError:
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print("Claude Code CLI not found. Install with: pip install claude-agent-sdk")
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except CLIConnectionError as e:
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print(f"Connection error: {e}")
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except ProcessError as e:
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print(f"Process error: {e}")
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anyio.run(run_with_recovery)
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```
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---
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## Session Resumption
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, ResultMessage, SystemMessage
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async def main():
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session_id = None
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# First query: capture the session ID
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async for message in query(
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prompt="Read the authentication module",
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options=ClaudeAgentOptions(allowed_tools=["Read", "Glob"])
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):
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if isinstance(message, SystemMessage) and message.subtype == "init":
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session_id = message.data.get("session_id")
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# Resume with full context from the first query
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async for message in query(
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prompt="Now find all places that call it", # "it" = auth module
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options=ClaudeAgentOptions(resume=session_id)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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---
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## Session History
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```python
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from claude_agent_sdk import list_sessions, get_session_messages
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# List past sessions (sync function — no await)
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sessions = list_sessions()
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for session in sessions:
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print(f"Session {session.session_id} in {session.cwd}")
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# Retrieve messages from the most recent session (sync function — no await)
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if sessions:
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messages = get_session_messages(session_id=sessions[0].session_id)
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for msg in messages:
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print(msg)
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```
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---
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## Session Mutations
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```python
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from claude_agent_sdk import rename_session, tag_session
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session_id = "your-session-id"
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# Rename a session
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rename_session(session_id=session_id, title="Refactoring auth module")
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# Tag a session for filtering
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tag_session(session_id=session_id, tag="experiment-v2")
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# Clear a tag
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tag_session(session_id=session_id, tag=None)
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# Scope to a specific project directory
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rename_session(session_id=session_id, title="New title", directory="/path/to/project")
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```
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---
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## Custom System Prompt
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```python
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import anyio
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from claude_agent_sdk import query, ClaudeAgentOptions, ResultMessage
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async def main():
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async for message in query(
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prompt="Review this code",
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options=ClaudeAgentOptions(
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allowed_tools=["Read", "Glob", "Grep"],
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system_prompt="""You are a senior code reviewer focused on:
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1. Security vulnerabilities
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2. Performance issues
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3. Code maintainability
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Always provide specific line numbers and suggestions for improvement."""
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)
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):
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if isinstance(message, ResultMessage):
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print(message.result)
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anyio.run(main)
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```
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Block a user