Which mcpindex is this?

This site - mcpindex.ai- is the in-path trust gate and public drift ledger for MCP tool calls: it pins each tool’s contract when your agent first sees it, holds the call when that contract silently changes, and publishes contract-change observations from a daily crawl of the reachable MCP registry at /ledger. The gate installs as the PyPI package mcpindex-gate; the directory client is the npm package mcp-server-mcpindex (registry name io.github.gautamgb/mcp-server-mcpindex), and the SDKs live under the npm scope @mcp-index. The GitHub org is github.com/mcpindex-ai.

Other projects share a similar name. At least one separate, unaffiliated tool called “MCPIndex” (a tool-discovery MCP server by a different author) appears on directory sites such as mcp.so and PulseMCP. It is not this project, not this codebase, and not maintained by us - and nothing here should be read as a comment on its quality. If you found a listing and are unsure which project it refers to, check whether it points at mcpindex.ai or github.com/mcpindex-ai.

Neither project is affiliated with Anthropic or the Model Context Protocol maintainers. mcpindex.ai indexes the public, Anthropic-maintained registry and says so on every page that uses its data.