MCP Probe

Name: MCP Probe
Author: incultnitollc

by incultnitollcversion 1.2.0i★ –iRuns on your computer

Registry nameio.github.Incultnitollc/mcp-probe

Install

Overview

Description from the maker (original English)

Inspect and score any MCP server 0-100 on publishability, schema and protocol before publish.

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: Other

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?

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": {
    "probe": {
      "command": "npx",
      "args": [
        "-y",
        "@incultnitollc/mcp-probe",
        "serve"
      ]
    }
  }
}

Run this in your terminal

claude mcp add probe -- npx -y @incultnitollc/mcp-probe serve

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "probe": {
      "command": "npx",
      "args": [
        "-y",
        "@incultnitollc/mcp-probe",
        "serve"
      ]
    }
  }
}

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": {
    "probe": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@incultnitollc/mcp-probe",
        "serve"
      ]
    }
  }
}

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 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account incultnitollc, 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 Otheri

More stars than 0% of the other 18333 servers in this category
Published to the registry more recently than 19% of the other 18333 servers in this category
Basic checks equal to or better than 100% of the other 18333 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 MCP Probe 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 (1.2.0) 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: Spec Driven Development, Remote Desktop Commander, Signoff

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

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

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

Install

Signoff

by ayuanxx-max

Five gates that make an agent's 'done' provable: run them, read the verdict, audit the record.

Runs on your computerUpdated today

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.

mcp-probe

One command to diagnose your MCP server.

Tests every tool, resource, and prompt your server exposes — then gives you a health report with a pass/fail scorecard.

Built on the Anthropic Model Context Protocol (MCP) spec.

Note: Published to npm as @incultnitollc/mcp-probe. The CLI binary is mcp-probe. The unscoped name mcp-doctor on npm is owned by an unrelated tool, so this project ships under a scope. Versions <= 0.2.1 shipped under the deprecated @incultnitostudiosllc scope — install @incultnitollc/mcp-probe instead.

npx @incultnitollc/mcp-probe test "npx -y @modelcontextprotocol/server-everything"

Test your MCP server in 30 seconds

Check	Description
Tool calling	Calls every tool with auto-generated sample arguments based on the input schema
Resource reading	Reads every resource and verifies content is returned
Prompt rendering	Gets every prompt with sample arguments and verifies messages are returned
Schema validation	Checks tool schemas for missing descriptions, broken required fields, malformed types
Health scoring	Summarizes everything into a pass/fail scorecard

Install

npm install -g @incultnitollc/mcp-probe

Or run directly:

npx @incultnitollc/mcp-probe test "your-server-command"

Usage

Local stdio server

npx @incultnitollc/mcp-probe test "npx -y @modelcontextprotocol/server-everything"

Remote server (Streamable HTTP)

npx @incultnitollc/mcp-probe test https://your-server.example.com/mcp

Remote server (SSE)

npx @incultnitollc/mcp-probe test https://your-server.example.com/mcp --transport sse

Authenticated remote server

npx @incultnitollc/mcp-probe test https://your-server.example.com/mcp \

--header "Authorization: Bearer $TOKEN"

Options

Flag	Description
`--json`	Output results as JSON
`--timeout`	Per-operation timeout (default 30000)
`--transport`	Force `stdio`, `sse`, or `http` (auto-detected from target)
`--header`	Add header to remote transport. Repeatable.

Exit codes

0 — All checks passed
1 — One or more checks failed (useful for CI gates)

JSON output

Use --json to get structured output for automation:

mcp-probe test --json "your-server" | jq '.score'

"toolsCallable": 12, "toolsTotal": 13, "resourcesReadable": 7, "resourcesTotal": 7, "promptsGettable": 3, "promptsTotal": 4, "schemaErrors": 0, "schemaWarnings": 1 }

How tool calling works

mcp-probe auto-generates arguments for each tool based on its inputSchema:

Only required fields get values (safest approach)
Uses default values and enum first choices when available
Infers smart defaults from field names (url → https://example.com, email → test@example.com)
Falls back to type-appropriate defaults (string → "test", number → 1, boolean → false)

This means tools with complex required inputs may fail — and that's useful information. It tells you your tool isn't self-contained enough for automated testing.

Publishability score (v1.1.0+)

mcp-probe ships a second, complementary check: a publishability composite that scores your server 0–100 on whether its schemas, descriptions, and metadata are ready for other people to install. Run it as a shorthand:

npx @incultnitollc/mcp-probe score "npx -y @your-scope/your-server" --package ./package.json

Or fold it into a full test run with --publishability:

npx @incultnitollc/mcp-probe test "npx -y @your-scope/your-server" --publishability --package ./package.json

The composite combines three sub-scores — Protocol (does the wire format work), Edge cases (does it handle weird inputs), and Publishability (would a stranger understand your tools) — and a five-axis breakdown across the publishability dimension:

Axis	What it checks
`description-five-axis`	Per-tool description density across purpose, mutation, side-effects, invariants, examples. Tools below 3.0/5 axes fire a ≤60 composite cap.
`enum-shape`	Catches prose-only enums (e.g. `"one of: open, closed"` in the description with no JSON Schema `enum`).
`mutation-legibility`	Does each tool tell a planner it mutates, or only reads? Name prefix / description signal / annotation all count.
`anti-purpose-clause`	High-blast tools (delete, send, transfer) should include a "do not use for X, prefer Y" pointer to a narrower tool.
`distribution-metadata`	npm package readiness — description length, keyword count, `repository` / `license` / `homepage` fields. Skipped without `--package`.

What scores look like on real servers

The five official Anthropic MCP servers all land at 60/100 under v1.1.0 — the description-five-axis cap fires on every one. That's not a bug in the rubric; that's the bar Anthropic ships at, and the bar most servers will start from. Full scorecards in docs/publishability-scorecards/.

CI gate

- uses: incultnitollc/mcp-probe@v1

with: command: 'node dist/index.js' publishability: 'true' package: './package.json' fail-under: '70'

Pre-publish vs install-time

mcp-probe's publishability score is the pre-publish quality lane — for server authors before they ship. For the install-time security lane — server installers before they connect a third-party server — see @stephenywilson/mcp-doctor. Different audiences, complementary tools.

Contract testing — "VCR for MCP" (v1.2.0+)

test/score tell you if your server is healthy *today*. Contract testing tells you what changed since last time — so a breaking schema edit or a poisoned tool description never ships silently.

Record a snapshot of your server's contract (its tools, resources, prompts, and their schemas — no traffic, no side effects), commit the .mcpvcr file, then diff or gate every PR against it.

# 1. Record a baseline (lists only — never calls a tool)

mcp-probe record "node dist/index.js" --out .mcp/contract.mcpvcr git add .mcp/contract.mcpvcr && git commit -m "record MCP contract baseline"

2. See what a change did to the contract

mcp-probe diff --baseline .mcp/contract.mcpvcr "node dist/index.js"

3. Gate CI — exit 1 on breaking or security changes

mcp-probe gate --baseline .mcp/contract.mcpvcr "node dist/index.js"

Every change is classified so the gate is meaningful, not noisy:

Severity	Examples
❌ breaking	tool removed · new required argument · property removed · type changed · enum narrowed
⚠️ security	tool description mutated (rug-pull / tool-poisoning) · `readOnlyHint` dropped · tool became destructive
✅ additive	new tool · new optional field · enum widened
ℹ️ info	server name · resource/prompt description text

gate fails on breaking,security by default — tune with --fail-on breaking (or any comma-separated set). Snapshots are deterministic: re-recording an unchanged server produces a byte-identical file, so committed baselines and diffs stay clean. Compare two recorded files offline with --against instead of a live target, and write a ready-to-post PR comment with --markdown .

Why it matters: the 2026-07-28 MCP spec ships breaking changes (dropped initialize handshake, error-code and JSON-Schema shifts, HTTP+SSE → Streamable HTTP). A recorded .mcpvcr baseline turns "did we break our clients?" into a one-line CI check. See examples/contract-gate.yml for the full PR workflow with auto-commenting.

Use cases

MCP server development — Run mcp-probe in your test suite to catch regressions
CI/CD gates — Block deploys if your MCP server doesn't pass health checks
Server evaluation — Quickly assess third-party MCP servers before integrating them
Schema quality — Find missing descriptions and malformed schemas before users hit them

CI integration

mcp-probe exits 0 on full pass and 1 on any failure, so it drops directly into any CI pipeline:

# .github/workflows/mcp-health.yml

name: Health-check MCP server run: npx @incultnitollc/mcp-probe test "$MCP_SERVER_CMD"

Use --json for structured output and jq to gate on specific metrics (e.g. fail the build if schemaWarnings > 0).

GitHub Action

Drop mcp-probe into your MCP server's GitHub Actions workflow in two lines:

- uses: incultnitollc/mcp-probe@v1

with: command: 'node dist/index.js'

Gate your PRs on a publishability composite:

- uses: incultnitollc/mcp-probe@v1

with: command: 'node dist/index.js' publishability: 'true' package: './package.json' fail-under: '70'

Inputs

Name	Required	Default	Description
`command`	yes	—	Command that launches your MCP server (e.g. `node dist/index.js` or `npx -y @your-scope/your-server`).
`fail-under`	no	`0`	Fail the job if the publishability composite drops below this value (0–100). Requires `publishability: 'true'`.
`publishability`	no	`false`	Run the publishability suite — 5 checks + 0–100 composite. Requires `mcp-probe >= 1.1.0` (ships 2026-05-23).
`package`	no	`''`	Path to `package.json` for the distribution-metadata check. Empty skips the distribution check.
`html-report`	no	`''`	Path to write the HTML scorecard. Upload via `actions/upload-artifact` in a follow-on step.
`mcp-probe-version`	no	`latest`	npm version, dist-tag, or `latest`. Pin for reproducible builds.
`json-output`	no	`''`	Path to write the JSON report for downstream parsing.

Outputs

Name	Description
`composite-score`	Publishability composite (0–100). Only set when `publishability: 'true'`.
`band`	Grade band: `publishable` / `almost` / `rough` / `not-ready`. Only set when `publishability: 'true'`.
`tools-pass-rate`	`tools_callable / tools_listed` as a decimal (e.g. `0.83`).
`schema-warnings`	Total schema warning count across all tools.

More examples: examples/basic.yml · examples/publishability-gate.yml · examples/matrix.yml.

Marketplace listing: github.com/marketplace/actions/mcp-probe-mcp-server-health-check.

Compared to MCP Inspector

The official MCP Inspector is a GUI for interactive exploration — point, click, see what a server returns. mcp-probe is a CLI for automated, repeatable diagnosis — every tool/resource/prompt called automatically, pass/fail scorecard out, exit code in. Use Inspector when you're exploring; use mcp-probe in CI, in pre-publish checks, or when you want a shareable scorecard of someone else's server.

Ecosystem

[MCP Registry](https://mcp-registry-dh5.pages.dev) — Cross-source catalog of MCP servers (~6,900 indexed across 6 upstream lists) with quality scores powered by mcp-probe. CLI: npm i -g @incultnitollc/mcpr. Built by Incultnito LLC.

Development

git clone https://github.com/incultnitollc/mcp-probe.git

cd mcp-probe npm install npm run dev -- test "npx -y @modelcontextprotocol/server-everything" npm test

License

MIT - Incultnito LLC

MCP Probe

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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

Signoff

README from the maker

mcp-probe

Test your MCP server in 30 seconds

Install

Usage

Local stdio server

Remote server (Streamable HTTP)

Remote server (SSE)

Authenticated remote server

Options

Exit codes

JSON output

How tool calling works

Publishability score (v1.1.0+)

What scores look like on real servers

CI gate

Pre-publish vs install-time

Contract testing — "VCR for MCP" (v1.2.0+)

2. See what a change did to the contract

3. Gate CI — exit 1 on breaking or security changes

Use cases

CI integration

GitHub Action

Inputs

Outputs

Compared to MCP Inspector

Ecosystem

Development

License