Subagentes en el SDK

import asyncio
from claude_agent_sdk import query, ClaudeAgentOptions, AgentDefinition


async def main():
    async for message in query(
        prompt="Review the authentication module for security issues",
        options=ClaudeAgentOptions(
            # Auto-approve these tools, including Agent for subagent invocation
            allowed_tools=["Read", "Grep", "Glob", "Agent"],
            agents={
                "code-reviewer": AgentDefinition(
                    # description tells Claude when to use this subagent
                    description="Expert code review specialist. Use for quality, security, and maintainability reviews.",
                    # prompt defines the subagent's behavior and expertise
                    prompt="""You are a code review specialist with expertise in security, performance, and best practices.

When reviewing code:
- Identify security vulnerabilities
- Check for performance issues
- Verify adherence to coding standards
- Suggest specific improvements

Be thorough but concise in your feedback.""",
                    # tools restricts what the subagent can do (read-only here)
                    tools=["Read", "Grep", "Glob"],
                    # model overrides the default model for this subagent
                    model="sonnet",
                ),
                "test-runner": AgentDefinition(
                    description="Runs and analyzes test suites. Use for test execution and coverage analysis.",
                    prompt="""You are a test execution specialist. Run tests and provide clear analysis of results.

Focus on:
- Running test commands
- Analyzing test output
- Identifying failing tests
- Suggesting fixes for failures""",
                    # Bash access lets this subagent run test commands
                    tools=["Bash", "Read", "Grep"],
                ),
            },
        ),
    ):
        if hasattr(message, "result"):
            print(message.result)


asyncio.run(main())

import asyncio
from claude_agent_sdk import query, ClaudeAgentOptions, AgentDefinition


# Factory function that returns an AgentDefinition
# This pattern lets you customize agents based on runtime conditions
def create_security_agent(security_level: str) -> AgentDefinition:
    is_strict = security_level == "strict"
    return AgentDefinition(
        description="Security code reviewer",
        # Customize the prompt based on strictness level
        prompt=f"You are a {'strict' if is_strict else 'balanced'} security reviewer...",
        tools=["Read", "Grep", "Glob"],
        # Key insight: use a more capable model for high-stakes reviews
        model="opus" if is_strict else "sonnet",
    )


async def main():
    # The agent is created at query time, so each request can use different settings
    async for message in query(
        prompt="Review this PR for security issues",
        options=ClaudeAgentOptions(
            allowed_tools=["Read", "Grep", "Glob", "Agent"],
            agents={
                # Call the factory with your desired configuration
                "security-reviewer": create_security_agent("strict")
            },
        ),
    ):
        if hasattr(message, "result"):
            print(message.result)


asyncio.run(main())

import asyncio
from claude_agent_sdk import query, ClaudeAgentOptions, AgentDefinition, ToolUseBlock


async def main():
    async for message in query(
        prompt="Use the code-reviewer agent to review this codebase",
        options=ClaudeAgentOptions(
            allowed_tools=["Read", "Glob", "Grep", "Agent"],
            agents={
                "code-reviewer": AgentDefinition(
                    description="Expert code reviewer.",
                    prompt="Analyze code quality and suggest improvements.",
                    tools=["Read", "Glob", "Grep"],
                )
            },
        ),
    ):
        # Check for subagent invocation. Match both names: older SDK
        # versions emitted "Task", current versions emit "Agent".
        if hasattr(message, "content") and message.content:
            for block in message.content:
                if isinstance(block, ToolUseBlock) and block.name in (
                    "Task",
                    "Agent",
                ):
                    print(f"Subagent invoked: {block.input.get('subagent_type')}")

        # Check if this message is from within a subagent's context
        if hasattr(message, "parent_tool_use_id") and message.parent_tool_use_id:
            print("  (running inside subagent)")

        if hasattr(message, "result"):
            print(message.result)


asyncio.run(main())

import { query, type SDKMessage } from "@anthropic-ai/claude-agent-sdk";

// Helper to extract agentId from message content
// Stringify to avoid traversing different block types (TextBlock, ToolResultBlock, etc.)
function extractAgentId(message: SDKMessage): string | undefined {
  if (message.type !== "assistant" && message.type !== "user") return undefined;
  // Stringify the content so we can search it without traversing nested blocks
  const content = JSON.stringify(message.message.content);
  const match = content.match(/agentId:\s*([a-f0-9-]+)/);
  return match?.[1];
}

let agentId: string | undefined;
let sessionId: string | undefined;

// First invocation - use the Explore agent to find API endpoints
for await (const message of query({
  prompt: "Use the Explore agent to find all API endpoints in this codebase",
  options: { allowedTools: ["Read", "Grep", "Glob", "Agent"] }
})) {
  // Capture session_id from ResultMessage (needed to resume this session)
  if ("session_id" in message) sessionId = message.session_id;
  // Search message content for the agentId (appears in Agent tool results)
  const extractedId = extractAgentId(message);
  if (extractedId) agentId = extractedId;
  // Print the final result
  if ("result" in message) console.log(message.result);
}

// Second invocation - resume and ask follow-up
if (agentId && sessionId) {
  for await (const message of query({
    prompt: `Resume agent ${agentId} and list the top 3 most complex endpoints`,
    options: { allowedTools: ["Read", "Grep", "Glob", "Agent"], resume: sessionId }
  })) {
    if ("result" in message) console.log(message.result);
  }
}

import asyncio
from claude_agent_sdk import query, ClaudeAgentOptions, AgentDefinition


async def main():
    async for message in query(
        prompt="Analyze the architecture of this codebase",
        options=ClaudeAgentOptions(
            allowed_tools=["Read", "Grep", "Glob", "Agent"],
            agents={
                "code-analyzer": AgentDefinition(
                    description="Static code analysis and architecture review",
                    prompt="""You are a code architecture analyst. Analyze code structure,
identify patterns, and suggest improvements without making changes.""",
                    # Read-only tools: no Edit, Write, or Bash access
                    tools=["Read", "Grep", "Glob"],
                )
            },
        ),
    ):
        if hasattr(message, "result"):
            print(message.result)


asyncio.run(main())