Composio

Composio solves one of the hardest problems in agent development: authentication. When an agent needs to interact with GitHub, Slack, Google Workspace, Salesforce, or any of hundreds of other services, it needs to handle OAuth flows, token refresh, and credential management — a nightmare to build per-service. Composio handles all of this through a single integration layer, giving agents authenticated access to over 1,000 tools.

Composio has been deeply invested in the agent ecosystem. They maintain a dedicated OpenClaw fork on GitHub, published blog posts about building and securing OpenClaw/Moltbot/Clawdbot agents with Composio, and operate an MCP portal at mcp.composio.dev with 500+ pre-implemented integrations as MCP servers. Their "Rube" product provides a pre-built MCP server for end users to connect Claude Desktop or Cursor to 500+ apps without writing code.

The platform offers a free tier with rate limits (100 tool calls/min), usage-based pricing beyond that, and startup credits for early-stage companies. Python and JavaScript SDKs are available, and the platform works with all major agent frameworks.