feat: add Anthropic Agents provider for Claude SDK

[naaa760]

Summary

• introduce AnthropicAgentsProvider, exposing every Composio tool as an MCP-compatible tool for the Claude Agents SDK and handling async execution + error surfacing
• add a quickstart demo that fetches GitHub tools, wires them into Claude Agents, and streams the agent’s responses
• include packaging metadata (setup.py) so composio-anthropic-agents can be distributed like the other provider plugins

fix: #2148

Testing

• python -m compileall python/providers/anthropic_agents

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Note

Adds AnthropicAgentsProvider to expose Composio tools to Claude Agents via MCP, plus a demo script and packaging for distribution.

• Provider (core):
  • Add composio_anthropic_agents/provider.py implementing AnthropicAgentsProvider to wrap Composio Tool as Claude SDK SdkMcpTool.
  • Async execution via asyncio.to_thread, pydantic validation error parsing, and response normalization to text blocks (success/error).
• Demo:
  • Add anthropic_agents_demo.py showing GitHub toolkit fetch, MCP server creation (create_sdk_mcp_server), and streaming agent responses with ClaudeSDKClient.
• Packaging:
  • Add setup.py for composio_anthropic_agents and __init__.py exporting AnthropicAgentsProvider.

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[Kjdragan]

Please unleash this Router Tool capabilities for direct Claude Agent SDK. We need this connection here or with Rube.