ACI.dev

ACI.dev is an open-source tool-calling platform connecting 600+ tools to AI agents via direct function calls or a unified MCP server, with OAuth, secrets, permissions, and dynamic discovery.

ACI.dev is an open-source tool-calling platform from Aipotheosis Labs that hooks 600+ tools into any agentic IDE or custom AI agent through direct function calling or a unified MCP server. It handles the hard parts of agent tool use, including multi-tenant OAuth and authentication, secrets management, granular natural-language permissions, dynamic tool discovery, and tool-use logging. The platform exposes tools in two ways. An Apps MCP Server surfaces functions from specific apps such as Gmail or GitHub and can bundle multiple apps into one server. A Unified MCP Server provides two meta-functions, ACI_SEARCH_FUNCTIONS and ACI_EXECUTE_FUNCTION, that let an agent dynamically discover and execute any tool on the platform, eliminating the need to pre-load long tool lists and optimizing LLM tool-calling performance. Because tools can be accessed via SDK-style direct function calls or through the unified MCP server, ACI.dev works with clients like Claude Desktop and Cursor and with custom agents alike. Billed as the birthplace of VibeOps, it targets developers who need reliable, secure, and scalable tool integration for agents without hitting context-window limits.