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io.github.cyanheads/pubchem-mcp-server

io.github.cyanheads/pubchem-mcp-server

by io.github.cyanheads· v0.8.1Source: Official MCP Registry
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Change history

Every change Squatch detected in tools, permissions, endpoints, versions and disclosures. History is append-only: entries are never edited or removed.

Nov 11, 2026

  1. Tool output schema changedSeverity: Low

    pubchem_search_compounds

    The declared output schema changed.

    Detected

  2. Tool output schema changedSeverity: Low

    pubchem_get_compound_details

    The declared output schema changed.

    Detected

  3. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

Oct 28, 2026

  1. Extension addedSeverity: Low

    io.modelcontextprotocol/skills

    The server now advertises a protocol extension.

    Detected

  2. Resource addedSeverity: Info

    template:skill://{+path}

    A new resource was observed.

    Detected

  3. Resource addedSeverity: Info

    resource:skill://pubchem-guide/SKILL.md

    A new resource was observed.

    Detected

  4. Tool output schema changedSeverity: Low

    pubchem_search_compounds

    The declared output schema changed.

    Detected

  5. Tool output schema changedSeverity: Low

    pubchem_search_assays

    The declared output schema changed.

    Detected

  6. Tool input schema changedSeverity: Low

    pubchem_search_assays

    Parameter descriptions or examples changed; the parameter structure is unchanged.

    Detected

  7. Tool output schema changedSeverity: Low

    pubchem_get_compound_interactions

    The declared output schema changed.

    Detected

  8. Tool input schema changedSeverity: Low

    pubchem_get_bioactivity

    Parameter descriptions or examples changed; the parameter structure is unchanged.

    Detected

  9. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

Oct 24, 2026

  1. Resource changedSeverity: Info

    template:pubchem://compound/{cid}/xrefs

    The resource definition changed.

    Detected

  2. Resource changedSeverity: Info

    template:pubchem://compound/{cid}/bioactivity

    The resource definition changed.

    Detected

  3. Tool output schema changedSeverity: Low

    pubchem_search_compounds

    The declared output schema changed.

    Detected

  4. Tool input schema changedSeverity: Low

    pubchem_search_compounds

    Parameters added: 0; removed: 0.

    Detected

  5. Tool description changedSeverity: Low

    pubchem_search_compounds

    The tool description changed.

    Detected

  6. Tool output schema changedSeverity: Low

    pubchem_get_summary

    The declared output schema changed.

    Detected

  7. Tool input schema changedSeverity: Low

    pubchem_get_summary

    Parameter descriptions or examples changed; the parameter structure is unchanged.

    Detected

  8. Tool output schema changedSeverity: Low

    pubchem_get_compound_xrefs

    The declared output schema changed.

    Detected

  9. Tool input schema changedSeverity: Low

    pubchem_get_compound_xrefs

    Parameters added: 0; removed: 0.

    Detected

  10. Tool description changedSeverity: Low

    pubchem_get_compound_xrefs

    The tool description changed.

    Detected

  11. Tool output schema changedSeverity: Low

    pubchem_get_compound_interactions

    The declared output schema changed.

    Detected

  12. Tool input schema changedSeverity: Low

    pubchem_get_compound_interactions

    Parameter descriptions or examples changed; the parameter structure is unchanged.

    Detected

  13. Tool description changedSeverity: Low

    pubchem_get_compound_interactions

    The tool description changed.

    Detected

  14. Tool output schema changedSeverity: Low

    pubchem_get_bioactivity

    The declared output schema changed.

    Detected

  15. Tool input schema changedSeverity: Low

    pubchem_get_bioactivity

    Parameters added: 1; removed: 0.

    Detected

  16. Tool description changedSeverity: Low

    pubchem_get_bioactivity

    The tool description changed.

    Detected

  17. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

Oct 16, 2026

  1. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  2. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  3. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  4. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  5. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  6. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  7. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  8. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  9. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  10. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  11. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  12. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  13. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  14. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  15. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  16. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  17. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  18. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  19. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected

  20. Publisher details changedSeverity: Low

    Changed: description.

    Detected

  21. New version publishedSeverity: Info

    A new version was published to the Official MCP Registry.

    Detected