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4GRAND MCP server

Which servers in the official MCP registry are 4GRAND's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

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Whose server it is
  • Registry nametennis.grand/4grandverified in the MCP registry

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

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools3
  • Server calls itself4grand
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 134 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: run a private pool for a group of friends; pick match winners round by round at Grand Slams.
  • Checked on 2 of the 7 days it takes to judge reliability.

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: 2, the first on 2026-10-20
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it0 of 2 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer869 ms
  • Space in an agent's context≈ 200 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 3 of 3

What an agent can do with it

  • cannot · run a private pool for a group of friends
  • cannot · pick match winners round by round at Grand Slams
  • not sure · follow daily recaps and standings in pool chat

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 (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). 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 2026-10-20
  • how_4grand_works

    Call this first. What 4GRAND is, what 'play for love' means, what it costs a player, and how scoring works.

  • current_tournament

    Which Grand Slam is in progress right now, how many matches are decided, and how fresh the results are.

  • public_pool_standings

    The leaderboard of a public community pool, by its share token. Private and club pools are not available.

How to connect

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

{
  "mcpServers": {
    "4grand": {
      "type": "http",
      "url": "https://grand.tennis/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http grand https://grand.tennis/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://grand.tennis/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.