Prototype · Preview: every server in the official registry, synced every 30 minutes. Reviews and accounts come in a later step.
PopNx MCPMCP servers for people who use AI · explained in plain words
Beginner mode Off
ColoursSystemLightDark
LanguageไทยEnglish中文日本語한국어EspañolDeutsch
☰ MenuSettings
Beginner mode Off
ColoursSystemLightDark
LanguageไทยEnglish中文日本語한국어EspañolDeutsch

Signalint

by TranQui004version 1.2.1i★ –iRuns on your computer
Registry nameio.github.TranQui004/signalint

Install

Overview

Description from the maker (original English)

Local stdio MCP server for cached, loop-aware JS/TS diagnostics (Oxlint, tsc, Biome, ESLint).

PopNx MCP’s three pillars

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

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?

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": {
    "signalint": {
      "command": "npx",
      "args": [
        "-y",
        "signalint-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add signalint -- npx -y signalint-mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "signalint": {
      "command": "npx",
      "args": [
        "-y",
        "signalint-mcp"
      ]
    }
  }
}

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": {
    "signalint": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "signalint-mcp"
      ]
    }
  }
}

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 TranQui004, 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 18345 servers in this category
  • Published to the registry more recently than 62% of the other 18345 servers in this category
  • Basic checks equal to or better than 100% of the other 18345 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 Signalint 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 (1.2.1) reached the registry 27 days 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, ScienceShot science reference

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

Sourced, citable answers in radiation and particle physics, photonics, electronics and quantum.

Runs in the cloudUpdated 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.

Signalint

Signalint is a reliable, read-only-by-default diagnostic intelligence layer for AI coding agents (Claude Code, Cursor, Codex, VS Code) and CI workflows.

Instead of flooding an agent's context window with thousands of raw compiler lines, Signalint normalizes diagnostics across compilers, linters, and language servers into bounded, priority-clustered issue summaries, calculates verification deltas against explicit baselines, and detects oscillating fix loops.

Key Differentiators

  • 13 Complete MCP Tools: From incremental checks and immutable snapshots to live diagnostic ingestion and journaled transactional fix application.
  • Verification Deltas: Exact arithmetic on introduced, resolved, and unchanged diagnostics with semantic identity matching that survives line shifts.
  • Immutable Snapshots & Concurrency Safety: Isolated in-memory snapshot store keyed by checkId eliminates race collisions during concurrent checks.
  • Monorepo-Aware Planning: Unites package manifests (pnpm-workspace.yaml) parsed via pure-JS YAML with glob negation exclusions and TypeScript Project References, ordering checks topologically.
  • Multi-Source Provenance: Distinguishes compiler, linter, and editor/LSP diagnostics across JavaScript, TypeScript, Python (Ruff/Mypy), Rust (Clippy), and Go (GolangCI-Lint).
  • Portable Host Hooks: Native verify-after-change adapters for Claude Code, Cursor, Codex, and VS Code.
  • In-Memory Previews & In-Process Rollback: In-memory previews never touch disk; apply uses per-file adjacent temporary-file replacement, pre-write drift detection, and in-process best-effort rollback for multi-file writes (does not claim persistent crash recovery if aborted abruptly).

Quick Start

1. Requirements
  • Node.js >= 22.12.0 (utilizes native node:sqlite).
  • Your project installs its own diagnostic engines (typescript, oxlint, eslint, and/or @biomejs/biome). Signalint detects project-local installations and ships no bundled engines.
2. Initialize in your repository
npx signalint init

This detects your project's linters/compilers, generates signalint.config.json, and configures your installed MCP clients.

3. Add to MCP Clients

Add Signalint to your MCP configuration (e.g. claude_desktop_config.json, .cursor/mcp.json):

{

"mcpServers": { "signalint": { "command": "npx", "args": ["-y", "signalint-mcp"] } } }

Complete MCP Tools Catalog

Signalint exposes 13 strictly typed MCP tools over stdio:

ToolCategorySafety AnnotationDescription
pingDiagnosticsRead-only (idempotent)Verifies server responsiveness and canonical project root path.
check_projectDiagnosticsRead-only (idempotent)Full project/workspace scan across all enabled engines.
check_filesDiagnosticsRead-only (idempotent)Fast incremental check on specific files using content-hash caching.
get_issue_detailDiagnosticsRead-only (idempotent)Retrieves full, unomitted issue records anchored to an immutable checkId.
get_loop_statusDiagnosticsRead-only (idempotent)Returns oscillating fix signatures and rule churn detected in the session.
get_diagnostic_snapshotSnapshotsRead-only (idempotent)Retrieves complete state and metrics for an immutable check snapshot.
compare_diagnosticsDeltasRead-only (idempotent)Computes verification delta between a baseline check and a current check.
after_edit_checkDeltasRead-only (idempotent)Runs incremental check on edited files and diffs against a baseline check.
ingest_diagnosticsLive / LSPRead-only (openWorld: false)Ingests external LSP or compiler diagnostics into Signalint's clustering model.
get_live_diagnosticsLive / LSPRead-only (idempotent)Returns active buffered diagnostics with source provenance.
preview_diagnostic_fixTransactionsRead-only (destructive: false)Stages proposed code fixes in-memory. Does not write to disk.
apply_diagnostic_fixTransactionsMutating (destructive: true)Per-file adjacent temp replacement, pre-write drift check, and in-process best-effort rollback.
discard_diagnostic_fixTransactionsRead-only (idempotent)Drops an in-memory fix transaction without touching disk.

See docs/mcp-contract.md for full JSON Schemas and error codes.

CLI Commands

Signalint includes a comprehensive command-line interface:

# Run a project diagnostic scan:

npx signalint check . npx signalint check src/ --format github # GitHub Actions annotations

View session statistics and cache economics:

npx signalint stats

Verify local engine availability and configuration:

npx signalint doctor

Manage host verify-after-change hooks:

npx signalint hooks preview --runtime claude npx signalint hooks install --runtime cursor --confirm npx signalint hooks run --runtime claude --payload ' '

Monorepo Support

Signalint natively understands multi-package monorepos:

  • Configure "monorepoMode": "auto" in signalint.config.json to detect pnpm-workspace.yaml via pure-JS YAML parsing with glob negation exclusions (!).
  • Strictly differentiates local workspace packages (workspace:*) from external npm registry dependencies.
  • Builds a topological dependency graph uniting package manifests and TypeScript project references.
  • Caches whole-program TypeScript builds in isolated per-package directories (.signalint/cache/tsc/ /).
  • Changes to a shared package automatically invalidate dependent packages while keeping independent siblings cached.

See docs/monorepo.md for configuration and architecture.

Verify-After-Change Hooks

Automate post-edit verification without creating infinite agent loops:

  • Native adapters for Claude Code, Cursor, Codex, and VS Code.
  • Emits bounded context into prompt windows and blocks only on unresolved syntax/type errors.

See docs/hooks.md for setup instructions.

Documentation Index

  • Architecture & Subsystems
  • MCP Protocol Contract & Schemas
  • Host Hook Adapters Guide
  • Monorepo Planning & Incremental TypeScript
  • Known Limitations & Risk Register
  • Wire Reduction Benchmarks
  • Security & Threat Model

License

MIT © 2026 Tran Trong Qui

Ask PopNx