4,298 MCP registry entries link to a GitHub repo that returns 404

Description and use

11 % of MCP registry entries link to GitHub repositories that return 404, indicating missing, private, renamed, or deleted repositories.

Problem

A significant portion of MCP registry entries link to GitHub repositories that return HTTP 404, indicating the repository is missing, private, renamed, or deleted.

Outcome

11% of MCP registry entries link to GitHub repos that return 404, and 1.3% of reachable repos are archived.

Workflow

• 1. Capture a snapshot of the MCP registry (2026‑10‑04).
• 2. For each entry with a GitHub repo link, query GitHub’s public repository API.
• 3. Record the HTTP status code for each lookup (performed 2026‑10‑06).
• 4. Aggregate counts by status, publisher, and repo reachability.
• 5. Publish results and dataset.

Evidence

Entries whose linked repo returns HTTP 404

4,298 of 38,977 registry entries (11.0%)

GitHub returns 404 for a repository that is missing or private.

Registry snapshot: 2026-10-04. Lookups: 2026-10-06.

Page with the figures and sources: https://protocolprobe.com/mcp/reports

Source