Specshield MCP Server

Name: Specshield MCP Server
Author: specshield-io

by specshield-ioversion 1.1.1i★ –iRuns on your computer

Registry nameio.github.specshield-io/specshield-mcp-server

Install

Overview

Description from the maker (original English)

The API-change deploy gate for AI coding agents. Read-only breaking-change detection.

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 checksi1 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: Developer tools
You need to fill in: SPECSHIELD_API_KEY

Install

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

Before you install

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

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": {
    "specshield": {
      "command": "npx",
      "args": [
        "-y",
        "specshield-mcp-server"
      ],
      "env": {
        "SPECSHIELD_API_KEY": "your-value",
        "SPECSHIELD_API_URL": "your-value",
        "SPECSHIELD_TIMEOUT_MS": "your-value",
        "SPECSHIELD_LOG_LEVEL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add specshield --env SPECSHIELD_API_KEY=your-value --env SPECSHIELD_API_URL=your-value --env SPECSHIELD_TIMEOUT_MS=your-value --env SPECSHIELD_LOG_LEVEL=your-value -- npx -y specshield-mcp-server

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": {
    "specshield": {
      "command": "npx",
      "args": [
        "-y",
        "specshield-mcp-server"
      ],
      "env": {
        "SPECSHIELD_API_KEY": "your-value",
        "SPECSHIELD_API_URL": "your-value",
        "SPECSHIELD_TIMEOUT_MS": "your-value",
        "SPECSHIELD_LOG_LEVEL": "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": {
    "specshield": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "specshield-mcp-server"
      ],
      "env": {
        "SPECSHIELD_API_KEY": "your-value",
        "SPECSHIELD_API_URL": "your-value",
        "SPECSHIELD_TIMEOUT_MS": "your-value",
        "SPECSHIELD_LOG_LEVEL": "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

SPECSHIELD_API_KEY secret required env
SpecShield API key
SPECSHIELD_API_URL env
Backend base URL
SPECSHIELD_TIMEOUT_MS env
Per-request timeout (ms)
SPECSHIELD_LOG_LEVEL env
debug|info|warn|error

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

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account specshield-io, which owns the repo
… 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 Developer toolsi

More stars than 0% of the other 1391 servers in this category
Published to the registry more recently than 42% of the other 1391 servers in this category
Basic checks equal to or better than 100% of the other 1391 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 Specshield MCP Server safe?

It passed 1 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: SPECSHIELD_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 (1.1.1) reached the registry 3 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: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

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

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GitHub’s official server lets AI read and manage code, issues and pull requests in your account. Use GitHub’s hosted version or run it locally with Docker.

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Install

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.

SpecShield MCP Server

The API-change deploy gate for AI coding agents. Ask *"is it safe to ship this API change to my consumers?"* right inside Claude, Cursor, and other MCP clients — and catch breaking changes before they reach your consumers.

It's a thin adapter over the SpecShield backend. Every tool is read-only / analyze-only — it never modifies your code.

Why not just diff specs? Plenty of tools (including free ones) list breaking

changes. SpecShield's job is the *decision*: can I deploy this? — the deploy

gate is the hero tool here.

⚙️ In CI/CD instead of an agent? The specshield CLI runs the same breaking-change and can-i-deploy checks in your pipeline (GitHub Action, exit codes). Same job, two entry points: this server for AI agents, the CLI for CI/CD.

Tools

#	Tool	What it answers
1	`is_change_safe` ⭐	Is this change safe to merge/deploy? Will it break consumers? (`safeToMerge` + risk + blocking reasons)
2	`explain_breaking_changes`	What breaks, developer & consumer impact, suggested migration
3	`generate_migration_guide`	Migration guide (markdown) + safe rollout steps
4	`generate_release_notes`	Release notes for developer / customer / internal
5	`compare_specs`	The raw diff (breaking / additions / modifications / warnings) + risk score
6	`run_governance_review` 🔒	API governance ruleset beyond breaking changes (missing operationId, error responses, security scheme, pagination, versioning…) → located findings + suggested fixes. Paid (Team+)

Tools 1–5 accept specs inline (baseSpecContent / targetSpecContent) or by path (baseSpecPath / targetSpecPath). run_governance_review reviews a single spec (specContent / specPath).

🔒 run_governance_review is a paid feature — a FREE API key returns a payment_required error. Upgrade at specshield.io/pricing.

Full setup, verification & troubleshooting: [docs/mcp-server-setup.md](docs/mcp-server-setup.md).

Install

Requires Node.js ≥ 20 and a SpecShield API key (from specshield.io/account).

npx -y specshield-mcp-server

Claude Desktop

claude_desktop_config.json:

"mcpServers": { "specshield": { "command": "npx", "args": ["-y", "specshield-mcp-server"], "env": { "SPECSHIELD_API_KEY": "ss_your_key_here" } } } }

Claude Code

claude mcp add specshield --env SPECSHIELD_API_KEY=ss_your_key_here -- npx -y specshield-mcp-server

Cursor

~/.cursor/mcp.json (or the project .cursor/mcp.json):

"mcpServers": { "specshield": { "command": "npx", "args": ["-y", "specshield-mcp-server"], "env": { "SPECSHIELD_API_KEY": "ss_your_key_here" } } } }

Configuration

Env var	Required	Default	Purpose
`SPECSHIELD_API_KEY`	yes	—	Your SpecShield API key. Store it as a secret; never commit it.
`SPECSHIELD_API_URL`	no	`https://api.specshield.io`	Backend base URL (override for self-hosted/staging).
`SPECSHIELD_TIMEOUT_MS`	no	`30000`	Per-request timeout.
`SPECSHIELD_LOG_LEVEL`	no	`info`	`debug` \	`info` \	`warn` \	`error` (logs go to stderr).

Example prompts (lead with the deploy gate)

*"Here are my old and new openapi.yaml — is it safe to ship this API change to my consumers?"*
*"Compare v1.yaml and v2.yaml and tell me if I can deploy, and why not."*
*"Explain the breaking changes between these two specs and how consumers should migrate."*
*"Generate customer-facing release notes for this API change."*

Security & privacy

API key required. Sent only as the X-Api-Key header to your configured backend.
Read-only / analyze-only. No mutation tools, no shell execution, no arbitrary file access (a spec file is read only when you explicitly pass a path).
No secret or spec logging. The server never logs spec content, API keys, or request bodies; error messages are redacted and machine-readable.
Specs are sent to your configured SpecShield backend for analysis.

Local development

npm install

npm run build # tsc → dist/ npm test # vitest (no network) npm run lint npm run smoke # boots the server against a stubbed backend and lists tools npm start # run the built server over stdio

Specshield MCP Server

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 Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

SpecShield MCP Server

Tools

Install

Claude Desktop

Claude Code

Cursor

Configuration

Example prompts (lead with the deploy gate)

Security & privacy

Local development

License