myelin-sdk 0.1.5

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 search to find workflows, record to begin a session, and finish to end it.

Python SDK / LangChain

Explicit integration for LangChain and LangGraph agents.

pip install myelin-sdk[langchain]

from myelin_sdk import MyelinSession

async with MyelinSession.create("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.

Syncing Local Procedures

Sync markdown procedure files from your repo to Myelin:

pip install myelin-sdk

# Sync all procedures from default directory (.claude/procedures/*.md)
myelin-sync

# Sync from a custom directory
myelin-sync --dir ./runbooks

# Sync specific files
myelin-sync deploy.md hotfix.md

Requires MYELIN_API_KEY, MYELIN_BASE_URL, and MYELIN_PROJECT_ID environment variables (or reads from .mcp.json).

Sync is idempotent — running twice with unchanged files produces no updates. Deleting a local file does not remove the server copy.