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Schemaguard
Overview
Description from the maker (original English)
API Schema Drift Monitor — detect breaking changes in OpenAPI specs
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
- UsageiVery new↓ 42/wk · ★ –
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
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).
- The registry lists no key to fill in.
You need
- npmNode.js installed (for the npx command)
Which app do you use?
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": {
"schemaguard": {
"command": "npx",
"args": [
"-y",
"@sethclawd/schemaguard"
]
}
}
}Run this in your terminal
claude mcp add schemaguard -- npx -y @sethclawd/schemaguardOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"schemaguard": {
"command": "npx",
"args": [
"-y",
"@sethclawd/schemaguard"
]
}
}
}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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"schemaguard": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@sethclawd/schemaguard"
]
}
}
}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.
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 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account sethclawd-prog, 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 5548 servers in this category
- Published to the registry more recently than 4% of the other 5548 servers in this category
- Basic checks equal to or better than 100% of the other 5548 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 Schemaguard 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?
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 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 (0.1.2) 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: GitHub, Desktop Commander, Cloudflare MCP
Alternatives
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
Desktop Commander
MCP server for terminal commands, file operations, and process management
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.
SchemGuard
API Schema Drift Monitor — detect breaking changes in OpenAPI specs before they break your consumers.
Why
APIs break silently. A field gets renamed, an endpoint gets removed, an enum value disappears — and downstream consumers break in production. SchemGuard catches these before deploy.
Install
npm install -g schemaguardUsage
Diff two specs
schemaguard diff old-api.yaml new-api.yamlOutput:
Found 11 change(s):❌ BREAKING CHANGES (9): ────────────────────────────────────────────────── ⛔ [endpoint-removed] Endpoint removed: DELETE /pets/{petId} at: DELETE /pets/{petId}
⛔ [field-type-changed] Parameter type changed: petId (string → integer) at: GET /pets/{petId} > param petId ...
🚨 9 breaking change(s) detected — deployment blocked.
CI mode
schemaguard ci --spec ./openapi.yaml --baseline ./main-openapi.yaml- Exit
0= no breaking changes, safe to deploy - Exit
1= breaking changes detected, blocks the pipeline - Exit
2= error (invalid spec, file not found)
Lint a spec
schemaguard lint ./openapi.yamlChecks for missing operationId, missing descriptions, no security schemes, etc.
JSON output
schemaguard diff old.yaml new.yaml --format jsonReturns structured JSON for programmatic consumption by agents and CI tools.
What it detects
Breaking changes (exit code 1)
| Rule | Description |
|---|---|
endpoint-removed | An endpoint was deleted |
method-removed | An HTTP method was removed from a path |
required-param-added | A new required parameter was added |
param-removed | An existing parameter was removed |
request-field-made-required | A request field became required |
field-type-changed | A field's type was changed |
response-field-removed | A response field was removed |
enum-value-removed | An enum value was narrowed |
auth-requirement-changed | Security schemes were modified |
response-code-removed | A response status code was removed |
Non-breaking changes (info only)
| Rule | Description |
|---|---|
endpoint-added | A new endpoint was added |
optional-param-added | A new optional parameter was added |
response-field-added | A new response field was added |
enum-value-added | An enum value was widened |
description-changed | Description or summary text changed |
deprecated | An endpoint was marked as deprecated |
GitHub Actions
- name: Check API compatibilityrun: npx schemaguard ci --spec ./openapi.yaml --baseline ./baseline.yaml
Programmatic API
import { parseSpec, diffSpecs, formatDiff } from 'schemaguard';const oldSpec = parseSpec('./v1.yaml'); const newSpec = parseSpec('./v2.yaml'); const result = diffSpecs(oldSpec, newSpec);
if (result.hasBreakingChanges) { console.log(${result.breaking.length} breaking changes found); }
License
MIT