# Composio

> Use 1000+ external apps via Composio - either directly through the CLI or by building AI agents and apps with the SDK

- Skill: `melandlabs/composio` (Agent Skill, multi-file: 33 files)
- Install (CLI): `npx skillmds@latest add melandlabs/composio`
- Raw SKILL.md: https://api.skillmd.com/api/skills/melandlabs/composio/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: melandlabs (https://skillmd.com/u/melandlabs)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/melandlabs/composio

---


## When to Apply

- User wants to access or interact with external apps (Gmail, Slack, GitHub, Notion, etc.)
- User wants to automate a task using an external service (send email, create issue, post message)
- Building an AI agent or app that integrates with external tools
- Multi-user apps that need per-user connections to external services

## Setup

Check if the CLI is installed; if not, install it:
```bash
curl -fsSL https://composio.dev/install | bash
```

After installation, restart your terminal or source your shell config, then authenticate:
```bash
composio login       # OAuth; interactive org/project picker (use -y to skip)
composio whoami      # verify org_id, project_id, user_id
```
For agents without direct browser access: `composio login --no-wait | jq` to get URL/key, share URL with user, then `composio login --key <cli_key> --no-wait` once they complete login.

---

### 1. Use Apps via Composio CLI

**Use this when:** The user wants to take action on an external app directly — no code writing needed. The agent uses the CLI to search, connect, and execute tools on behalf of the user.

Key commands (new top-level aliases):
- `composio search "<query>"` — find tools by use case
- `composio execute "<TOOL_SLUG>" -d '{...<input params>}'` — execute a tool
- `composio link [toolkit]` — connect a user account to an app (agents: always use `--no-wait` for non-interactive mode)
- `composio listen` — listen for real-time trigger events

Typical workflow: **search → link (if needed) → execute**

> Full reference: [Composio CLI Guide](rules/composio-cli.md)

---

### 2. Building Apps and Agents with Composio

**Use this when:** Writing code — an AI agent, app, or backend service that integrates with external tools via the Composio SDK.

Run this first inside the project directory to set up the API key:
```bash
composio init
```

> Full reference: [Building with Composio](rules/building-with-composio.md)

---

## Sandbox and network

Composio operations are network-heavy: CLI install, OAuth login, tool search,
tool execution, and trigger subscriptions all make outbound calls. If any of
these fail with a network error (`ECONNREFUSED`, `ETIMEDOUT`, "unreachable",
or a hung login), check whether Codex is running inside a sandbox before
declaring the install or login broken. Codex sandboxing can block:

- `curl -fsSL https://composio.dev/install | bash` (and the post-install
  binary download from Composio's CDN).
- `composio login` (OAuth redirect, browser handoff, and token exchange).
- `composio execute`, `composio search`, and `composio listen` (calls to
  Composio's tool-router and the 1000+ external app APIs).
- `mcp__composio__*` MCP tool calls and `COMPOSIO_REMOTE_BASH_TOOL` /
  `COMPOSIO_REMOTE_WORKBENCH` if outbound network is sandboxed.

Request approval and retry the same command outside the sandbox. If the
outside-sandbox retry succeeds, treat the in-sandbox failure as a sandbox
artifact and continue. Do not report that the install URL is invalid, the
auth flow is broken, or a remote app is unreachable until the outside-sandbox
retry also fails. For agents without direct browser access, `composio login
--no-wait | jq` is the recommended handoff — make sure that pattern is not
swallowed by the sandbox.