StringSpec

com.stringspecv1.0.0Updated Oct 7, 2026

Lab measurements of nearly 800 tennis strings: search, compare and get recommendations.

VerifiedStreamable HTTPWeb executableLocation & Lifestyle

Overview

AI-generated overview

Lets an assistant search, compare and get recommendations from lab measurements of nearly 800 tennis strings.

What it does
Answers questions about tennis strings from lab measurements taken on the same machine under the same protocol, covering stiffness, tension loss, energy return and spin. Tools include search_strings for filtering by name, brand, material, gauge and price with sorting and a limit of ten results per call; get_string for all measurements on one string with percentiles, elongation, estimated playable life, tension adjustment, category rankings, alternatives and retail price; compare_strings for two or three strings side by side; and recommend_strings for a ranked shortlist with a 0 to 100 fit score and reasons, adjusted for racquet pattern, head size and frame stiffness. Answers separate actuals
When to use it
Use it when choosing or advising on tennis strings: finding the softest or stiffest options, checking how fast a string loses tension, comparing specific models, or matching strings to a player's needs and racquet, for example for tennis elbow or more spin on an 18x20 pattern. It suits players and coaches who want measurement-based answers instead of marketing claims. It is not a general-purpose tool. It is not a general-purpose tool. It is not a general-purpose tool. It is not a general-purpose
Requirements
A remote MCP server reached over Streamable HTTP at the provider's endpoint; no credentials, account, API key or environment variables are needed. Any client that supports remote MCP servers over Streamable HTTP works, and the server speaks protocol versions 2026-07-28, 2025-11-25, 2025-06-18 and 2025-03-26, answering with JSON rather than SSE and using no sessions. Network access to the provider is required.
Before you install
All tools are read-only and no account or credentials are requested. The server receives the tool name and its arguments, such as a string name or a need like comfort, to answer the request and states it does not store them; it does not see your conversation or account. Prices are dated and playable life, tension advice and fit scores are estimates derived from measurements, not measured values, so treat them as guidance.

Installation

In SourceWeft

  1. Open StringSpec in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

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

README

StringSpec for Claude and other MCP clients

[StringSpec]

Ask an AI assistant about tennis strings and get answers from lab measurements instead of marketing copy: how stiff a string is, how fast it loses tension, how much energy it returns, how much spin it allows, and which strings suit a player's needs and racquet.

This repository holds:

  • the connection details for the StringSpec remote MCP server at https://stringspec.com/mcp,
  • a Claude plugin that adds that server plus a string-research skill, which teaches Claude how to read the numbers.

The server is run by StringSpec, a database of nearly 800 tennis strings measured on the same machine under the same protocol, so one string's numbers compare fairly with another's. How the numbers are made: methodology.

What you can ask

  • "Which polyester strings are the softest, and what do they cost?"
  • "How fast does Solinco Hyper-G 16 lose tension, and how long will it stay playable?"
  • "Compare RPM Blast 17 with Luxilon ALU Power 16L."
  • "I have tennis elbow and a stiff racquet. What should I string, without natural gut?"
  • "What should I string for more spin on an 18x20 racquet?"

Tools

All tools are read-only (readOnlyHint: true) and need no account.

ToolWhat it answers
search_stringsFilter by name, brand, material, gauge and price; sort by popularity, softest, stiffest, most spin, best tension hold, most power or cheapest. At most 10 strings per call.
get_stringEverything on one string, found by name: every measurement with its percentile in the database, elongation at 40, 51 and 62 lb, an estimated playable life, a tension adjustment, how it ranks for spin, comfort, control, power, tension hold, durability and feel, the closest alternatives, and the retail price.
compare_stringsTwo or three strings side by side, with the comparison page on stringspec.com.
recommend_stringsStringSpec's string finder: a main need and an optional second one, adjusted for the racquet (string pattern, head size, frame stiffness), with a material ruled out if asked. Returns a ranked shortlist with a 0 to 100 fit and the reason each string fits.

Every answer separates measurements from estimates (playable life, tension advice and fit are derived from the measurements) and dates each price.

Setup

Claude (claude.ai, Desktop, mobile)

Settings → Connectors → Add custom connector, then paste https://stringspec.com/mcp. No sign-in is needed.

Claude Code

Install the plugin, which adds the server and the string-research skill:

/plugin marketplace add BigBalli/stringspec-mcp/plugin install stringspec@stringspec

Or add only the server:

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

Other MCP clients

Any client that supports remote MCP servers over Streamable HTTP can use https://stringspec.com/mcp with no credentials. The server speaks protocol versions 2026-07-28, 2025-11-25, 2025-06-18 and 2025-03-26 and answers with JSON (no SSE, no sessions).

Privacy

The server receives the tool name and its arguments (for example a string name or "comfort"), uses them to answer, and does not store them. It never sees your conversation or your account. Full policy: stringspec.com/privacy.

Support

Email [email protected], or see stringspec.com/connect.

License

The contents of this repository are released under the MIT License. The data served by the StringSpec MCP server is not part of this repository and is not covered by that license.

Source: README.md at commit acfc2a7

Tools

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Version history

1
  1. v1.0.0LatestOct 7, 2026