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Appendix MCP server

Which MCP servers are Appendix's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-19

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Whose server it is
  • Registry namecom.appendix/appendixverified in the MCP registry

The registry name sits under appendix.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-19
  • Stateanswerschecked 2026-10-19
  • Tools3
  • Server calls itselfAppendix
  • Server version1.1.0
  • Protocol version2025-06-18

On 2026-10-19 the server answered initialize and tools/list without a sign-in. First answer in 132 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 9, the first on 2026-10-19
  • INITE MCP score88 of 100answers 100 · definitions 100 · context 100 · use 12 · connects 100
  • Use2 GitHub stars
  • Answered100% of days9 of 9 daily checks
  • Median first answer334 ms
  • Space in an agent's context≈ 472 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • not sure · get a physician-reviewed opinion on a non-urgent condition
  • not sure · request a prescription after physician review
  • not sure · build physician review requests into an app

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-10-19
  • search_knowledge_base

    Search Appendix's medical knowledge base for clinical literature, treatment guidelines, and reference material to help the user describe their medical issue

  • submit_encounter

    Submit a clinical encounter letter to the Appendix physician team for review. The letter should be in Markdown format following the Appendix letter structure. Returns feedback on completeness or a checkout URL when ready. One of our…

  • list_conditions

    List all conditions and medications available through Appendix

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "appendix": {
      "type": "http",
      "url": "https://mcp.appendix.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http appendix https://mcp.appendix.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.appendix.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.