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// Call external services (MCP)

aci

Open-source tool-calling platform hooking 600+ tools into agents.

Open source Maintained For agents

Official site ↗ GitHub ↗

IN ONE PARAGRAPH

aci is open-source tool-calling platform hooking 600+ tools into agents.

Good for: Developers who want their agent (Claude Code, Codex, Cursor…) to call external services (mcp).

Not for: people who don’t want to install and run tools themselves.

01How to start

  1. 1Read the official README for requirements and permissions.
  2. 2Install it as the official guide describes.
  3. 3Add it to your agent’s MCP config — Claude Code: claude mcp add; Cursor: .cursor/mcp.json; Codex: ~/.codex/config.toml.

02Alternatives & comparison

Compare side by side →
modelcontextprotocol/servers Model Context Protocol Servers ★ 91k context7 Context7 Platform -- Up-to-date code documentation for LLMs and AI code editors ★ 63k github-mcp-server GitHub's official MCP Server ★ 34k composio Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action. ★ 31k PrefectHQ/fastmcp 🚀 The fast, Pythonic way to build MCP servers and clients. ★ 28k

03Related

Versions, why it is listed, for AI to read

Popularity evidence (third-party snapshots)

For AI agents

Data updated: AI software & hot ranks · Software profiles & needs · Official software downloads(UTC+8)