# StringSpec (remote · stringspec.com)

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

- Trust score: 87/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `stringspec.com`: 87/100 (this document), [markdown](https://verifymcp.io/servers/com-stringspec-mcp/stringspec.md), [page](https://verifymcp.io/servers/com-stringspec-mcp/stringspec)

## Channel facts

- Endpoint: `https://stringspec.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 79/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1021 tokens (~204/item across 5 items; 4 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 93/100
  - Stability observed for 28 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).
  - Supports UI / widget rendering.

## Install

### How do I install the StringSpec MCP server?

StringSpec is a hosted endpoint at https://stringspec.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

```json
{
  "mcpServers": {
    "com-stringspec-mcp": {
      "url": "https://stringspec.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-stringspec-mcp": {
      "type": "http",
      "url": "https://stringspec.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-stringspec-mcp]
url = "https://stringspec.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-stringspec-mcp": {
      "type": "remote",
      "url": "https://stringspec.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-stringspec-mcp --url 'https://stringspec.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-stringspec-mcp:
    url: "https://stringspec.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-stringspec-mcp": {
      "Transport": "http",
      "Url": "https://stringspec.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-stringspec-mcp -t streamable-http -u 'https://stringspec.com/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 87, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 83, +3)

- [functional improvement] Schema quality: 245 → 204
- [functional] The server now declares the “resources” capability
- [functional] First check of Capabilities: pass
- [functional] First check of Schema quality: 100
- [functional] New resource “compare-v1”

### 2026-10-24 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (4)

### `search_strings` (~326 tokens)

Search tennis 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, each with its percentile in the database, plus the current retail price, a buy link and the StringSpec page. Returns at most 10 strings; narrow the filters rather than asking for more.

Input parameters:

- `brand` (string): Brand name, e.g. "Babolat", "Luxilon", "Solinco".
- `gauge` (string): Gauge label. A higher number is thinner, and an "L" gauge is thinner than its base (17L is thinner than 17).
- `include_discontinued` (boolean): Include strings no longer sold (default false).
- `limit` (integer): How many to return (default 10).
- `material` (string): Construction family. Polyester is the stiff spin-friendly monofilament; Nylon covers synthetic gut and multifilaments; Gut is natural gut.
- `max_price_usd` (number): Only strings with a retail set price at or under this, in USD. Strings without a price are excluded when this is set.
- `query` (string): Words from the string's name, e.g. "alu power", "hyper-g", "rpm blast".
- `sort` (string): popular (a retailer's units-sold order, default), softest, stiffest, most_spin, best_tension_hold, most_power (energy return), cheapest.

### `get_string` (~142 tokens)

Get one tennis 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 player's usual, how it ranks for each playing need (spin, comfort, control, power, tension hold, durability, feel), the closest alternatives, the retail price and a buy link. When the name matches several strings it returns the best match and lists the others.

Input parameters:

- `name` (string, required): The string's name, e.g. "Luxilon ALU Power 16L" or "RPM Blast".

### `compare_strings` (~53 tokens)

Compare tennis 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.

Input parameters:

- `names` (array, required): Two or three string names.

### `recommend_strings` (~317 tokens)

Recommend tennis strings for a player

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 depth), hold (Plays the same for longer), durable (Lasts longer before it breaks), feel (Best feel and touch)), adjusted for the racquet (string pattern, head size, frame stiffness) and with a material ruled out if asked. Returns a shortlist with a 0-100 fit, why each string fits, its price and buy link, and the finder link with the same answers filled in. For arm or elbow pain use need "comfort", and avoid "poly" when the player wants no polyester.

Input parameters:

- `also` (string): An optional second need, weighted lower than the first.
- `avoid` (string): gut (no natural gut), poly (no polyester), polyonly (polyester only).
- `frame` (string): Frame feel: flex (flexible, arm-friendly), avg, stiff (stiff and powerful).
- `head` (string): Head size: small (under 98 sq in), mid (98-100), large (100 and up).
- `limit` (integer): Shortlist length (default 8).
- `need` (string, required): The main thing the player wants.
- `pattern` (string): String pattern: open (16x19 or more open) or dense (18x20 or tighter).

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-stringspec-mcp/stringspec#diagnostics

## Score history

- 2026-11-05: 87
- 2026-11-04: 87
- 2026-11-03: 86
- 2026-11-02: 86
- 2026-11-01: 85
- 2026-10-31: 85
- 2026-10-30: 84
- 2026-10-29: 84
- 2026-10-28: 84
- 2026-10-27: 83
- 2026-10-26: 83
- 2026-10-25: 80
- 2026-10-24: 80
- 2026-10-23: 79
- 2026-10-22: 79
- 2026-10-21: 78
- 2026-10-20: 78
- 2026-10-19: 77
- 2026-10-18: 77
- 2026-10-17: 76
- 2026-10-16: 76
- 2026-10-15: 75
- 2026-10-14: 75
- 2026-10-13: 75
- 2026-10-12: 74
- 2026-10-10: 73
- 2026-10-09: 73

## Common questions

### What is the StringSpec MCP server?

StringSpec is an MCP server listed in the public MCP registry as com.stringspec/mcp. Lab measurements of nearly 800 tennis strings: search, compare and get recommendations. This page covers its hosted endpoint (https://stringspec.com/mcp).

### Is the StringSpec MCP server safe to use?

StringSpec scores 87 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the StringSpec MCP server expose?

StringSpec exposes 4 tools: search_strings, get_string, compare_strings, recommend_strings. Their descriptions and schemas cost roughly 838 tokens of context every time the server is loaded.

### Does the StringSpec MCP server require authentication?

No. We connected to StringSpec without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the StringSpec MCP server still maintained?

StringSpec is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the StringSpec MCP server?

VerifyMCP ran 14 checks on StringSpec, covering TLS certificate, Authorization, HTTPS, HSTS header and 10 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://stringspec.com/mcp
- Repository: https://github.com/BigBalli/stringspec-mcp
- Website: https://stringspec.com/connect/
- Changelog RSS feed: https://verifymcp.io/servers/com-stringspec-mcp/stringspec.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-stringspec-mcp/stringspec/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/com-stringspec-mcp/stringspec.json
- HTML version of this page: https://verifymcp.io/servers/com-stringspec-mcp/stringspec