Context7
Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.
Computer or cloud
StringSpec
What it does
Lab measurements of nearly 800 tennis strings: search, compare and get recommendations.
- Connects Runs in the cloud
- Account or key May need a key; not confirmed (our check was refused)
- Category Search & AI memory
Install
Pick the AI app you use, then copy the settings.
Passed 2/4 checks · What you ask goes through the maker’s server (stringspec.com) · ✓ Commands checked Nov 13, 2026
First: which AI do you use?
Pick your app and the steps appear below.
Works with Claude · about 2 min
No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it
Open Claude’s Connectors page
CustomizeConnectors
Click “Add” → “Custom” → “Web” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameStringSpecRemote MCP server URL · Addresshttps://stringspec.com/mcpClick Continue past the sign-in settings Claude detected · under Authentication choose what the maker says (Sign in now, Sign in when needed or No sign in), then click Add
Turn it on in a chat
+ConnectorsStringSpec
Try it
Use StringSpec and tell me what you can do for me, then show me one thing✓ If Claude says it is using StringSpec or shows a StringSpec tool in the answer, you are connected
Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with ChatGPT, depending on your plan
Full MCP: ChatGPT Business, Enterprise or Edu on the web · Pro: connects with read/fetch permissions, so tools that change data may not work · Plus: not confirmed in OpenAI’s docs; if you see an add-custom-MCP option on the Plugins page you can try these steps · web only
Open ChatGPT’s add-MCP page on the web
Plugins+Add custom MCP server
Fill in the name and address
Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin
Name · NameStringSpecConnection · Addresshttps://stringspec.com/mcpPick StringSpec in a chat
Start a new chat and pick StringSpec from your plugins before typing
Try it
Use StringSpec and tell me what you can do for me, then show me one thing✓ If ChatGPT says it is using StringSpec or shows a StringSpec tool in the answer, you are connected
Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with Claude Code · about 2 min
No key, nothing to install
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Paste this command and press Enter
claude mcp add --transport http --scope user stringspec https://stringspec.com/mcpType /mcp in Claude Code
You should see StringSpec listed as connected
Try it
Use StringSpec and tell me what you can do for me, then show me one thing✓ If Claude Code says it is using StringSpec or shows a StringSpec tool in the answer, you are connected
Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with Cursor · about 2 min
No key, nothing to install
Open the AI chat in Cursor in Agent mode
Try it
Use StringSpec and tell me what you can do for me, then show me one thing✓ If Cursor says it is using StringSpec or shows a StringSpec tool in the answer, you are connected
Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Works with VS Code · about 2 min
No key, nothing to install
Open the AI chat in VS Code in Agent mode
Try it
Use StringSpec and tell me what you can do for me, then show me one thing✓ If VS Code says it is using StringSpec or shows a StringSpec tool in the answer, you are connected
Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version
Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.
Address for apps that connect over the web
Address
https://stringspec.com/mcpJSON settings are under “For developers” below
For developers: Terminal commands and JSON settings
Over the web
Claude Code
claude mcp add --transport http --scope user stringspec https://stringspec.com/mcpCursor (~/.cursor/mcp.json)
{
"mcpServers": {
"stringspec": {
"url": "https://stringspec.com/mcp"
}
}
}VS Code (mcp.json)
{
"servers": {
"stringspec": {
"type": "http",
"url": "https://stringspec.com/mcp"
}
}
}These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
At a glance
- Downloads per weeki
- Not on npm/PyPI
- Verified domain
- ✓ stringspec.com
- Connection
- Runs in the cloud
- Transport
- streamable-http
- Latest versioni
- 1.0.0
- Categoryi
- Search & AI memory
- Published to registryi
- Oct 8, 2026
- Code last changedi
- Nov 3, 2026
- Maker
- BigBalli
- Website
- stringspec.com
- Registry status
- Active
Which apps can use it
Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.
Connect over the internet in
ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast
Related guides
What it can do
The server asks you to sign in before it lists its tools.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 13, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain stringspec.com (the registry checks domain ownership)
- ✓ Pass
Still maintained
Code last changed 10 days ago
- – Not applicable
Has a licence
Not applicable: a cloud server run by the owner of stringspec.com; you don't run code from the repo
- ! Caution
- ! Caution
Sign-in with OAuth
Needs a key or token that you copy and paste yourself
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Discussion
Ask, share a tip or report that it does not work. Sorted by what people marked helpful.
No posts yet. Be the first to ask or share.
Posts here are written by users, not the PopNx team.
User reviews
No reviews yet
Compared with others in Search & AI memoryi
- More stars than 0% of the other 6049 servers in this category
- Published to the registry more recently than 51% of the other 6049 servers in this category
- Basic checks equal to or better than 10% of the other 6049 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is StringSpec safe?
It passed 2 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed 10 days ago, and the latest version (1.0.0) reached the registry 36 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT on the web (full MCP on Business and above; Pro read-only).
What can I use instead?
In the same category: Context7, Codebase Memory, Ruflo
Others in the same category
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Codebase Memory
Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.
Runs on your computer
Ruflo
Agent teams, swarms, memory and hooks for Claude Code and Codex, served over MCP.
Runs on your computer
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
StringSpec for Claude and other MCP clients
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-researchskill, 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.
| Tool | What it answers |
|---|---|
search_strings | Filter 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_string | Everything 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_strings | Two or three strings side by side, with the comparison page on stringspec.com. |
recommend_strings | StringSpec'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/mcpOther 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 g@bigballi.com, 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.