myelin-sdk 0.1.3

Procedural memory for AI agents — agents that have done a task 100 times shouldn't fumble on attempt 101.

Myelin SDK

Procedural memory for AI agents. Agents that have done a task 100 times shouldn't fumble on attempt 101.

Claude Code

Zero-code integration via PostToolUse hooks.

1. Install the SDK

uv tool install myelin-sdk

2. Add the MCP server

claude mcp add --scope project --transport http myelin https://myelin.fly.dev/mcp \
  -H "Authorization: Bearer YOUR_API_KEY"

3. Add the PostToolUse hook

Add this to .claude/settings.json:

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "myelin-capture"
          }
        ]
      }
    ],
    "PostToolUseFailure": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "myelin-capture"
          }
        ]
      }
    ]
  }
}

4. Update .gitignore

Add .mcp.json to your .gitignore (it contains your API key).

The hook captures every tool call automatically. Use memory.recall and memory.finish MCP tools to start and end sessions.

Python SDK / LangChain

Explicit integration for LangChain and LangGraph agents.

pip install myelin-sdk[langchain]

from myelin_sdk import MyelinSession

async with MyelinSession.start("handle support ticket", api_key="my_...") as session:
    handler = session.langchain_handler()

    # Pass handler to your LangChain agent
    result = await agent.ainvoke(
        {"messages": [{"role": "user", "content": "..."}]},
        config={"callbacks": [handler]},
    )
# session.finish() called automatically on exit

Adding an Integration

The integrations/langchain/ directory is the template for new integrations. To add support for another framework (e.g., CrewAI, AutoGen):

1. Create src/myelin_sdk/integrations/<framework>/
2. Add __init__.py and a handler module
3. Use MyelinClient.capture() to record tool calls
4. Add an optional dependency group in pyproject.toml
5. Add a convenience method on MyelinSession

See integrations/langchain/handler.py for a complete reference implementation.