Composio is the layer that connects agents to external tools. Instead of writing an integration for every service, the team connects the agent to a catalogue of already authenticated actions with managed credentials.
What it is for
- Giving the agent access to email, calendar, CRM, code, spreadsheets and messaging
- Handling per-user OAuth without keeping tokens in code
- Reducing the number of tools exposed to the model, with on-demand action search
- Carrying the same integrations across different frameworks with little rework
How it works
- Each service becomes a set of typed actions the agent can call
- Authentication happens once per user and is reused across runs
- Tool search filters the catalogue and hands the model only what is relevant
- It supports MCP, so the catalogue works in compatible clients
- Triggers let the agent start when something happens in a connected service
Availability
- Open-source SDK under the MIT licence, with packages for the main languages
- Optional commercial managed service, with a free plan for testing
Points to note
- Third-party integrations change their APIs and may need adjustments
- Broad permissions on real accounts require scope review and auditing
- In small teams, weigh whether the extra layer is worth the complexity