Argus — Testing for Coding Agents MCP server

<!-- mcp-name: io.github.chriswu727/argus -->

Argus

An MCP server that tests apps like a real testing engineer—exploring user journeys, discovering unscripted bugs, and proving each finding before reporting it.

Argus is an MCP server. It adds evidence-first browser QA to Claude Code, Codex, Cursor, or any MCP host without taking over the host agent's identity or broader coding task. The agent explores, inspects, verifies persistence, and records reproducible bugs. Every certified finding is independently re-confirmed from a clean page load before it's reported.

Product page · Quick start · Why Argus · Compared · Tools · Benchmarks

The output

Give it a URL; get a report of bugs — each tagged with whether Argus independently reproduced it or only observed it:

The green badge is the whole point. Anyone can have an LLM claim a bug. Argus re-loads the page from scratch and re-checks the symptom before it says VERIFIED — so the report is a list of bugs you can trust, not a list of guesses to triage.

How it works

flowchart LR
    A(["observe"]) --> B{"looks wrong?"}
    B -->|not sure| C["act: click · type · resize · verify"]
    C --> A
    B -->|bug| D["verify_persistence — reload from a clean state"]
    D -->|symptom repeats| E(["VERIFIED"])
    D -->|symptom gone| F(["dropped — no false positive"])
    E --> G[["report: HTML · JSON · JUnit · SARIF"]]

The agent is the intelligence. Argus supplies concise QA guidance, a description-keyed tool surface (clickwhat("Login button"), not click(7)), a goal coverage ledger, and a reproduction-receipt engine** that turns "the model thinks this is a bug" into "this bug is real, here's the proof."

Quick start

With uv installed, no global Python package install is required. Install Chromium once:

uvx --from playwright playwright install chromium

Then connect Argus to your MCP client.

Claude Code

claude mcp add argus -- uvx --from argus-testing argus-mcp

Codex and the ChatGPT desktop app

Codex CLI, the Codex IDE extension, and the ChatGPT desktop app share the same local MCP configuration:

codex mcp add argus -- uvx --from argus-testing argus-mcp

Cursor

The button adds Argus to Cursor; run the Chromium installation command above once before the first test.

Any stdio MCP client

{
  "mcpServers": {
    "argus": {
      "command": "uvx",
      "args": ["--from", "argus-testing", "argus-mcp"]
    }
  }
}

Shortened. The full README is on GitHub.