Composio

Composio is a freemium tool integration and execution platform in the AI Agent Builders category that connects AI agents to over 1,000 external services through a single API, with a free tier offering 20,000 tool calls per month and usage-based pricing beyond that.

Building AI agents that can reason, plan, and generate text is only half the challenge. The other half — connecting those agents to the real-world services where work actually happens — remains a costly, error-prone engineering effort. Every SaaS integration demands its own OAuth flow, token refresh logic, API wrapper, error handling, and security hardening. Multiply that across dozens or hundreds of services and across multiple end users in a multi-tenant product, and integration code quickly dwarfs the agent logic itself.

Composio eliminates this integration tax by providing a purpose-built execution layer between AI agents and external services. Rather than asking developers to hand-roll OAuth flows, write API wrappers, manage token refresh cycles, and harden code execution sandboxes for every service their agent needs to touch, Composio offers a managed platform where all of this is handled out of the box.

The platform's core value proposition rests on three pillars. First, breadth: Composio maintains over 1,000 pre-built toolkits spanning SaaS applications (Gmail, Slack, Notion, Google Calendar), developer tools (GitHub, Linear, Jira), CRMs (Salesforce, HubSpot), e-commerce platforms (Stripe, Shopify), and many more. Each toolkit exposes typed actions with parameter schemas that can be loaded into any LLM's tool-calling interface. Second, managed authentication: the Composio Entity model handles per-end-user OAuth 2.0 flows, API key storage, bearer tokens, and session management, including automatic token refresh and revocation. This lets multi-tenant agent products connect each customer's own accounts without building bespoke auth infrastructure. Third, execution safety: tool calls run inside Composio's sandboxed environments with isolation, parallel execution, rate-limit handling, and permission verification, reducing the operational risk of letting AI agents perform real-world actions.

Composio is framework-agnostic by design. It provides native integrations for LangChain, CrewAI, AutoGen, LangGraph, LlamaIndex, and Semantic Kernel, and works with OpenAI function calling, Anthropic Claude tool use, Google Gemini, and the Model Context Protocol (MCP). This means developers can adopt Composio without being locked into a specific orchestration stack, and can switch frameworks as the ecosystem evolves.

The platform also supports intelligent action filtering through composiosearchtools, which allows agents to search the toolkit catalog at runtime and load only the schemas relevant to the current task. This just-in-time approach keeps prompt context small and reduces token costs compared to dumping hundreds of tool definitions upfront.

For coding agents specifically, Composio provides dedicated integrations for Claude Code, Cursor, and Codex, giving these agents authenticated access to GitHub, Linear, Jira, and deployment platforms alongside their native file-editing capabilities. The MCP Gateway feature lets organizations expose their Composio toolkits to any MCP-compatible client under unified governance and access control.

Composio is open source (GitHub: ComposioHQ/composio) with a managed cloud offering. The free tier includes 20,000 tool calls per month with full access to the toolkit catalog, while the Developer Platform tier adds usage-based pricing for higher volumes. Enterprise customers get SSO, audit logs, dedicated infrastructure, SLAs, and compliance controls through a custom pricing engagement.