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Tools give your AI Teammate the ability to take action during a conversation — not just respond. Instead of stopping at an answer, your agent can call an API, look up live data, trigger something in your app, or connect to any of thousands of third-party services. Tools are powered by LLM function calling — the agent decides when a tool is relevant based on the user’s request and your description of what the tool does.

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Tool Types

Integrations

Connect 1,000+ apps via Composio — Slack, Google Calendar, Salesforce, HubSpot, and more. Authorize with native OAuth or API key.

API & Webhook

Call any external HTTP endpoint during a conversation. Define the URL, method, headers, and parameters — the agent handles the rest.

MCP

Bring your own Model Context Protocol server. Connect via Streamable HTTP or SSE for a standards-based tool integration.

Client Tools

Trigger actions inside your frontend — open a modal, navigate to a page, update the UI — handled by your npm package at runtime.

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When to Use Each

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Testing a Tool

Every tool has a Test button in the Studio. Once you configure a tool, you can run it in a live sandbox directly from the Tools tab — provide the inputs the tool expects, fire the request, and see the exact response before saving to your agent. The test flow supports all four tool types:
  • API / Webhook — sends a real HTTP request to your endpoint and shows the status code + response body
  • MCP — lists the tools exposed by your MCP server and lets you invoke any of them with test parameters
  • Client tools — validates the schema and simulates the handler
  • Integrations — lets you fire a real Composio action with test inputs against your connected account
The response is displayed with the HTTP status colored green (2xx), amber (3xx), or red (4xx/5xx) so you can catch misconfigured auth, wrong URLs, or bad payload shapes without ever starting a conversation.
Test tools before attaching them to a production agent. A misconfigured tool that only fails mid-conversation is a bad first impression for users.

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What’s Next?

Integrations

Connect Composio apps to your agent in minutes.

Custom Tools

Build API, MCP, and client-side tools for your agent.