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Which MCP servers are StringSpec'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 2026-10-20

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Whose server it is
  • Registry namecom.stringspec/mcpverified in the MCP registry

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

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools4
  • Server calls itselfstringspec
  • 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 86 ms.

Should an agent connect itConnect it
  • Its tools do every use case we checked: compare up to three tennis strings on lab metrics; find a string that fixes spin or comfort problems; check which strings hold tension longest between restrings.

Once connected

  • For "compare up to three tennis strings on lab metrics", the likely first call is compare_strings.
  • For "find a string that fixes spin or comfort problems", the likely first call is recommend_strings.

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 2026-10-20
  • INITE MCP score90 of 100answers 100 · does the job 100 · definitions 100 · context 100 · use 0 · connects 100
  • What an agent can do with it3 of 3 use cases
  • Answered100% of days9 of 9 daily checks
  • Median first answer204 ms
  • Space in an agent's context≈ 1,244 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · compare up to three tennis strings on lab metrics
  • can do · find a string that fixes spin or comfort problems
  • can do · check which strings hold tension longest between restrings

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 offers4 tools · read 2026-10-20
  • search_strings

    Search 791 lab-measured tennis strings by name, brand, material and gauge, sorted by a measurement or by price. Each result carries stiffness (lb/in), tension loss (%), energy return (%), spin potential, ball bite and string friction…

  • get_string

    Everything StringSpec has on one string, found by name (misspellings and missing gauges are fine): every measurement with its database percentile, elongation at 40, 51 and 62 lb, an estimated playable life, a tension adjustment versus the…

  • compare_strings

    Side-by-side measurements, percentiles, prices and buy links for 2 or 3 strings by name, with the StringSpec comparison page when there are two.

  • recommend_strings

    Rank the database for what a player wants, with StringSpec's string finder: one main need and an optional second one (spin (More spin and shape), comfort (Easier on my arm), control (More control, less launch), power (More power and…

How to connect

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

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

Add it

Claude Code, in a terminal

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

Add to CursorAdd to VS Code

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