Perf MCP

Name: Perf MCP
Author: Perf-Technology

by Perf-Technologyversion 0.1.1i★ –iRuns on your computer

Registry nameio.github.Perf-AI/perf-mcp

Install

Overview

Description from the maker (original English)

Fact-check and fix AI outputs. Hallucination detection, schema validation, auto-repair.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi0 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: PERF_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 0 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: PERF_API_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "perf": {
      "command": "npx",
      "args": [
        "-y",
        "perf-mcp"
      ],
      "env": {
        "PERF_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add perf --env PERF_API_KEY=your-value -- npx -y perf-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "perf": {
      "command": "npx",
      "args": [
        "-y",
        "perf-mcp"
      ],
      "env": {
        "PERF_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "perf": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "perf-mcp"
      ],
      "env": {
        "PERF_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

PERF_API_KEY secret required env
Your Perf API key (get one at dashboard.withperf.pro)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

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 7, 2026

! Caution
Maker matches the repo
The publisher (Perf-AI) is not the repo owner (Perf-Technology); someone else may have listed it
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32718 servers in this category
Published to the registry more recently than 2% of the other 32718 servers in this category
Basic checks equal to or better than 27% of the other 32718 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 Perf MCP safe?

It passed 0 of 1 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?

You need to fill in: PERF_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.1) reached the registry 9 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, MemberVault MCP by usefulapi

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago

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MemberVault MCP by usefulapi

by m190

List courses; add users to courses, remove course access or delete users in MemberVault.

Runs in the cloudUpdated today

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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.

perf-mcp

Fact-check and fix AI outputs. Catches hallucinations, repairs broken JSON, corrects errors — before they reach users.

Works with Claude Code, Cursor, Windsurf, Cline, and any MCP-compatible client.

Quick Start

Add to your MCP client config:

"mcpServers": { "perf": { "command": "npx", "args": ["-y", "perf-mcp"], "env": { "PERF_API_KEY": "pk_live_xxx" } } } }

Get your API key at dashboard.withperf.pro — 200 free verifications, no credit card.

Tools

`perf_verify`

Detect and repair hallucinations in LLM-generated text. Uses multi-channel verification (web search, NLI models, cross-reference) — not just another LLM check.

perf_verify({ content: "The Eiffel Tower was built in 1887." })

→ Corrected: "built in 1887" → "inaugurated in 1889" (89% confidence)

`perf_validate`

Validate LLM-generated JSON against a schema and auto-repair violations. Fixes malformed enums, wrong types, missing fields, hallucinated properties.

perf_validate({

content: '{"name": "John", "age": "twenty"}', target_schema: { type: "object", properties: { name: { type: "string" }, age: { type: "number" } } } }) → Rejected: /age must be number

`perf_correct`

General-purpose output correction. Classifies the error type and applies the right fix — hallucination, schema violation, semantic inconsistency, or instruction drift.

perf_correct({ content: "The Great Wall was built in 1950.", correction_budget: "fast" })

→ Corrected: temporal_error + factual_error detected (87% confidence)

`perf_chat`

Route LLM requests to the optimal model automatically. Selects between GPT-4o, Claude, Gemini, and 20+ models based on task complexity. OpenAI-compatible format.

Setup by Client

Claude Code

Add to your project's .mcp.json:

"mcpServers": { "perf": { "command": "npx", "args": ["-y", "perf-mcp"], "env": { "PERF_API_KEY": "pk_live_xxx" } } } }

Cursor

Settings → MCP → Add Server:

"mcpServers": { "perf": { "command": "npx", "args": ["-y", "perf-mcp"], "env": { "PERF_API_KEY": "pk_live_xxx" } } } }

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

"mcpServers": { "perf": { "command": "npx", "args": ["-y", "perf-mcp"], "env": { "PERF_API_KEY": "pk_live_xxx" } } } }

Environment Variables

Variable	Required	Description
`PERF_API_KEY`	Yes	Your Perf API key (`pk_live_xxx`)
`PERF_BASE_URL`	No	Override API URL (for testing)

Pricing

Plan	Credits	Price
Free	200 verifications	$0 (never expires)
Pro	1,000/mo	$19/mo
Pay-as-you-go	Unlimited	$0.02/verification

1 tool call = 1 credit. Get started at dashboard.withperf.pro.

License

MIT

Perf MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

MemberVault MCP by usefulapi

README from the maker

perf-mcp

Quick Start

Tools

perf_verify

perf_validate

perf_correct

perf_chat

Setup by Client

Claude Code

Cursor

Windsurf

Environment Variables

Pricing

License

`perf_verify`

`perf_validate`

`perf_correct`

`perf_chat`