Composio

This is a gateway skill that connects Claude to 1000+ external apps (Gmail, Slack, GitHub, Google Calendar, Notion, etc.) through Composio's API. It runs on Fly's internal network, so there's no API key juggling on your end. The workflow is search for tools, grab the full schema, then execute. One nice touch: failed executions return the tool schema in the error response so you can self-correct without another round trip. The Browserbase integration is worth noting because it's hybrid: Composio handles session lifecycle (create/delete), but you use Playwright over CDP for actual browser control. Good for when you need Claude to interact with external services without building individual integrations yourself.

skills.sh installs: 4.3K
GitHub stars: 32
last updated: Aug 21, 2026

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Install

$ npx -y skills add starchild-ai-agent/official-skills --skill composio --agent claude-code

Installs into .claude/skills of the current project.

Files

Composio — External App Integration via Gateway

Composio lets users connect 1000+ external apps (Gmail, Slack, GitHub, Google Calendar, Notion, etc.) to their Starchild agent. All operations go through the Composio Gateway (composio-gateway.fly.dev), which handles auth and API key management.

Architecture

Agent (Fly 6PN network)
    ↓  HTTP (auto-authenticated by IPv6)
Composio Gateway (composio-gateway.fly.dev)
    ↓  Composio SDK
Composio Cloud → Target API (Gmail, Slack, etc.)

You never touch the COMPOSIO_API_KEY — the gateway holds it
You never call Composio SDK directly — use the gateway HTTP API
Authentication is automatic — your Fly 6PN IPv6 resolves to a user_id via the billing DB
No env vars needed — the gateway is always accessible from any agent container

Gateway Base URL

GATEWAY = "http://composio-gateway.flycast"

All requests use plain HTTP over Fly internal network (flycast). No JWT needed.

SKILL.md on GitHub

Details

Repository: github.com/starchild-ai-agent/official-skills
Categories: Backend & APIs, Git & Pull Requests, AI & Agent Building, Office & Documents
First seen: May 16, 2026

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