Diagrams · Fig. 15

Source liveness census

14.0% of referenced repositories were unreachable, confirmed by two independent vantages with zero disagreements.

Source liveness censusA census funnel over the MCP registry. 17,673 listed servers reference 13,105 GitHub repositories. Each repository was checked from two independent vantages with a 48-hour debounce, producing zero cross-vantage disagreements. 1,830 repositories, 14.0%, were not publicly reachable, affecting 2,069 listed servers. The census digest is anchored to Bitcoin via OpenTimestamps and archived under CC-BY-4.0 with a DOI. The evidence is negative-only: an absent entry means nothing publishable, never a healthy verdict.listed servers17,673extract the referenced source repository for eachreferenced GitHub repositories13,105vantage Avantage B0 cross-vantage disagreementsconfirmed only after 2 failures ≥48h apartrepository reachability1,830 not publicly reachable · 14.0% · one in sevenlisted servers affected2,069CENSUS 2026-07-20· DIGEST ANCHORED TO BITCOIN VIA OPENTIMESTAMPS · CC BY 4.0 · DOI 10.5281/ZENODO.21501868Negative-only evidence: an absent entry means nothing publishable, never“verified healthy” — a reachable repository proves only that a URL resolves.
Fig. 15 · 14.0% of referenced repositories were unreachable, confirmed by two independent vantages with zero disagreements.
Read Fig. 15 as text
  listed servers                    17,673
        |  extract referenced source repositories
        v
  referenced GitHub repositories    13,105
        |
        +-- vantage A --+
        |               +-- 0 cross-vantage disagreements (48h debounce)
        +-- vantage B --+
        v
  not publicly reachable            1,830  (14.0%, one in seven)
        |
        v
  listed servers affected           2,069

  census date 2026-07-20. digest anchored to bitcoin via OpenTimestamps.
  CC-BY-4.0, DOI 10.5281/zenodo.21501868.
  NEGATIVE-ONLY evidence: an absent entry means nothing publishable, never
  "verified healthy" - a reachable repo proves only that a URL resolves.
What the figure says

A census funnel over the MCP registry. 17,673 listed servers reference 13,105 GitHub repositories. Each repository was checked from two independent vantages with a 48-hour debounce, producing zero cross-vantage disagreements. 1,830 repositories, 14.0%, were not publicly reachable, affecting 2,069 listed servers. The census digest is anchored to Bitcoin via OpenTimestamps and archived under CC-BY-4.0 with a DOI. The evidence is negative-only: an absent entry means nothing publishable, never a healthy verdict.

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Last reviewed 2026-07-27 · derived live from SOURCE_LIVENESS_CENSUS · never hand-typed

Questions this answers

mcp registry dead links &middot; mcp server repository unreachable &middot; mcp registry quality research