Implement Q2 2026 roadmap: MCP CLI export commands and LangChain SDK

[Copilot]

Implements Q2 2026 roadmap features for agent developer experience: CLI export commands and Python SDK for LangChain integration.

MCP CLI Commands

Added docs and export subcommands to micro mcp:

• micro mcp docs - Generate markdown/JSON documentation from service metadata
• micro mcp export langchain - Generate Python LangChain tool definitions
• micro mcp export openapi - Generate OpenAPI 3.0 spec
• micro mcp export json - Export raw tool definitions

Implementation: cmd/micro/mcp/mcp.go (~500 LOC), comprehensive examples in cmd/micro/mcp/EXAMPLES.md

LangChain Python SDK

New package contrib/langchain-go-micro/ provides native LangChain integration:

from langchain_go_micro import GoMicroToolkit
from langchain.agents import initialize_agent
from langchain_openai import ChatOpenAI

# Auto-discover services and create LangChain tools
toolkit = GoMicroToolkit.from_gateway("http://localhost:3000")
agent = initialize_agent(
    toolkit.get_tools(service_filter="users"),
    ChatOpenAI(model="gpt-4")
)

agent.run("Create a user named Alice")

Features:

• Automatic service discovery via MCP gateway
• Dynamic LangChain tool generation with descriptions/examples
• Bearer token auth, service filtering, error handling
• Full type hints, unit tests, examples

Package structure:

• langchain_go_micro/toolkit.py - Core implementation (300+ LOC)
• langchain_go_micro/exceptions.py - Custom exceptions
• tests/test_toolkit.py - Comprehensive test coverage
• examples/ - Basic and multi-agent workflows

Documentation

• Updated PROJECT_STATUS_2026.md to reflect Q2 completion (80%)
• Created IMPLEMENTATION_SUMMARY.md with session details
• Updated examples/mcp/README.md with new commands

Roadmap Progress:

• Q1 2026: 100% complete
• Q2 2026: 80% complete (ahead of schedule)
• Q3 2026: 40% complete (auth/tracing delivered early)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 224.0.0.251
  • Triggering command: REDACTED, pid is -1 (packet block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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