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---
title: Overview
description: Composio REST API and SDK reference for AI agent tool execution, authentication, and integrations
keywords: [Composio API, REST API, SDK reference, AI agent tools, tool execution, API documentation]
---
Composio powers tool discovery, execution, authentication, and context management for your AI agents with 1000+ toolkits. This reference covers our REST APIs and SDKs.
## Quick Reference
- **Base URL**: <ApiBaseUrl />
- **[Authentication](/reference/v3/authentication)**: `x-api-key` (project) or `x-org-api-key` (organization) header
- **[Rate Limits](/reference/v3/rate-limits)**: 2K-10K requests per minute (plan-dependent)
## REST API
| API | Description |
|-----|-------------|
| [Tool Router](/reference/v3/api-reference/tool-router) | Session-based API for AI agents to discover and execute tools |
| [Tools](/reference/v3/api-reference/tools) | List, search, and execute individual actions |
| [Connected Accounts](/reference/v3/api-reference/connected-accounts) | Manage user OAuth connections to apps |
| [Auth Configs](/reference/v3/api-reference/auth-configs) | Configure how users authenticate to toolkits |
| [Triggers](/reference/v3/api-reference/triggers) | Subscribe to webhooks from connected apps |
| [Toolkits](/reference/v3/api-reference/toolkits) | Browse available apps and their tools |