Vdiff MCP

Name: Vdiff MCP
Author: mcurmi05

by mcurmi05version 0.1.2i★ –iRuns on your computer

Registry nameio.github.mcurmi05/vdiff-mcp

Install

Overview

Description from the maker (original English)

Breaking-change diffs for npm packages: removed exports, changed signatures, migration notes.

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↓ 56/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: Docs, sheets & office work

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: VDIFF_API_URL

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": {
    "vdiff": {
      "command": "npx",
      "args": [
        "-y",
        "vdiff-mcp"
      ],
      "env": {
        "VDIFF_API_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add vdiff --env VDIFF_API_URL=your-value -- npx -y vdiff-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": {
    "vdiff": {
      "command": "npx",
      "args": [
        "-y",
        "vdiff-mcp"
      ],
      "env": {
        "VDIFF_API_URL": "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": {
    "vdiff": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "vdiff-mcp"
      ],
      "env": {
        "VDIFF_API_URL": "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

VDIFF_API_URL env
Base URL of the vdiff API instance to use (defaults to the hosted https://vdiff-api.onrender.com)

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 mcurmi05, 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 Docs, sheets & office worki

More stars than 0% of the other 3592 servers in this category
Published to the registry more recently than 16% of the other 3592 servers in this category
Basic checks equal to or better than 100% of the other 3592 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 Vdiff MCP 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 4 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: Agent-Native Calendar, Excel MCP Server, MCP Server for Excel

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

Agent-Native Calendar

Agent-Native Google Calendar - manage events, sync, and public booking

by BuilderIOWidely used★ 7.6KUpdated 2 months ago

Runs in the cloud

Install

Excel MCP Server

Lets AI create and edit Excel files itself, including formulas, charts and PivotTables, without Excel installed.

by haris-musaWidely used↓ 49.6K/wk★ 4.3KUpdated 8 days ago

Runs on your computer

Install

MCP Server for Excel

Excel automation for AI - Sheets, Power Query, DAX, VBA, Tables, Ranges and more. Windows only.

by sbroenneGrowing↓ 4.3K/wk★ 847Updated 5 days ago

Runs on your computer

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.

vdiff

A breaking-change diff API for npm packages. Given a package and two versions, it returns a structured, machine-readable list of what actually broke: removed exports, changed function signatures, and removed or changed class and interface members. Each entry includes the before and after signatures plus a short migration note.

Live at https://vdiff-api.onrender.com. Most easily consumed through the MCP server, vdiff-mcp:

claude mcp add vdiff -- npx -y vdiff-mcp

Or call the REST API directly:

curl "https://vdiff-api.onrender.com/v1/diff?ecosystem=npm&package=zod&from=3.24.0&to=4.0.0"

Why this exists

LLMs learn a package's API surface during training, then the package moves on. When a coding agent writes code against zod or express, it writes for the version it remembers, which is often not the version in your lockfile. The result is confident code that calls functions that were renamed or removed two majors ago.

Existing tools only solve part of this. Version lookup tools tell the agent what the current version is. Documentation tools tell it what the docs say today. Neither answers the question the agent actually has mid-edit: "what changed between the version I know and the version installed here?"

vdiff answers exactly that. Diffs are computed from the package's own type declarations rather than changelogs, so the output reflects the real exported surface, and every response carries a confidence score so the consumer knows how much to trust it.

Endpoint reference: docs/api.md.

How it works

Resolve. Fetch package metadata, versions and dist-tags from the npm registry.
Extract. For each of the two versions, download the tarball, keep only the .d.ts files, and build a table of public exports (functions, classes, members, normalized call signatures) using the TypeScript compiler API. Bundled declarations are preferred; packages that ship none fall back to the matching DefinitelyTyped @types/* package, version-matched by major.minor.
Compare. Diff the two export tables into typed change entries (export_removed, signature_changed, member_removed and so on), each with before/after signatures and a migration note.
Cache and meter. Results are stored in Postgres keyed on (package, from, to), so each version pair is computed once, ever. Every request is logged with cache-hit status and user agent.
Guard. Per-IP rate limits, a cap on simultaneous diff computations, size limits on tarballs and extracted declarations, and fetch timeouts keep the service safe to expose publicly.

Diffs are type-level: a runtime behavior change that leaves the types untouched is invisible. Responses using bundled types carry confidence 0.9; responses using community-maintained @types/* declarations carry 0.8.

API overview

Endpoint	Purpose
`GET /v1/diff`	Breaking-change diff between two versions (`from` required, `to` defaults to latest)
`GET /v1/resolve`	Latest version and dist-tags for a package
`GET /healthz`	Liveness check

See docs/api.md for parameters, response shapes, change types, error codes and rate limits.

Stack

Layer	Choice	Why
Runtime	Node 20+, TypeScript	npm-only `.d.ts` diffing needs the TS compiler API, so one language
API	Fastify 5	Fast, minimal, good TypeScript support
Diffing	`typescript` compiler API	Structured symbol tables from `.d.ts` files, the core of the product
Database	Postgres 18 (Docker local, Neon prod)	JSONB for variable-shape diff payloads, SQL for billing and analytics
Registry	npm registry HTTP API + `tar`	Packuments and tarball extraction, declarations only
Tests	Vitest	Unit tests for compare logic and `@types` version matching

The code is cloud-agnostic: a plain container plus a DATABASE_URL. It currently runs on Render with Neon Postgres.

Running it yourself

docker compose up -d      # Postgres 18 on :5432

npm install npm run db:migrate # apply src/db/schema.sql npm run dev # API on :3000

Or containerized, the way a PaaS runs it (applies the schema on boot, then serves):

docker build -t vdiff-api .

docker run -p 3000:3000 -e DATABASE_URL="postgres://user:pass@host:5432/db" vdiff-api

Configuration

All configuration is via environment variables:

Env var	Default	Purpose
`PORT`	`3000`	Listen port
`DATABASE_URL`	local Docker Postgres	Postgres connection string
`RATE_LIMIT_DIFF_MAX`	`30`	Per-IP `/v1/diff` requests per minute
`RATE_LIMIT_RESOLVE_MAX`	`120`	Per-IP `/v1/resolve` requests per minute
`COMPUTE_CONCURRENCY`	`2`	Max simultaneous diff computations
`TRUST_PROXY`	unset	Set `true` behind a PaaS proxy so the rate limiter sees real client IPs

Hardening notes

Rate limiting: per-IP, in-memory (fine while single-instance). /healthz is exempt for platform health checks.
Compute cap: at most COMPUTE_CONCURRENCY uncached diffs compile at once; excess requests get a 503 with retry-after. Cached diffs are always served.
Size guards: tarball downloads are capped at 50 MB (checked via content-length and counted bytes), extracted declarations at 15 MB per version. Oversized packages fail with a clear 422.
Fetch budgets: 10 s for packuments, 30 s for tarballs. Tarballs are only fetched from registry.npmjs.org over HTTPS.

Project layout

src/

index.ts Fastify bootstrap, /healthz routes.ts /v1/resolve, /v1/diff: validation, cache, dedup, metering registry/npm.ts packument fetch, tarball download, .d.ts extraction diff/ symbols.ts .d.ts to symbol table (TS compiler API) compare.ts symbol table diff to breaking changes engine.ts orchestration, @types/* fallback, confidence db/ schema.sql packages, versions, diffs, diff_requests_log migrate.ts applies schema mcp/ vdiff-mcp, the MCP server wrapping this API (published to npm) docs/ api.md endpoint reference, kept current with the code

Tests

npm test          # unit tests (Vitest)

npx tsc --noEmit # typecheck

License

The API and diff engine are licensed under the Functional Source License, v1.1, MIT Future License (FSL-1.1-MIT): free to use, read and modify for anything except offering a competing service, and each release automatically becomes MIT two years after publication.

The MCP server wrapper in mcp/ is MIT licensed.

Vdiff 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 Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

vdiff

Why this exists

How it works

API overview

Stack

Running it yourself

Configuration

Hardening notes

Project layout

Tests

License