IronBee vs Playwright MCP
IronBee is the QA engineer for your coding agent. It works out what a change has to prove, can hold the agent until the change is verified, finds the root cause when it fails, and keeps the evidence. Playwright MCP gives the agent a browser. What to check, when to check it and why it failed are left to the agent.
- A gate inside Claude Code, Cursor and Codex, in enforce mode
- Full stack frontend, backend, mobile and CLI, in the coding agent
- File + line the root cause when a check fails
- Every run kept in the Console, with its recording, traces and logs
What IronBee brings
It starts from the change
With Playwright MCP, what gets checked is whatever the agent or your prompt decides to click. IronBee starts from the diff: it verifies the areas the change affects, and a pass only counts when the tools that prove it were actually used.
A gate, not a tool
A tool runs only when the agent chooses to call it. IronBee registers a completion hook in Claude Code, Cursor and Codex. In enforce mode the hook runs verification before the agent can finish a code change, and a pass submitted without real tool calls is rejected.
Full stack, not only the browser
Clicking through a page does not verify an API, a worker or a command-line tool. Inside the coding agent IronBee also makes real HTTP, gRPC, GraphQL and WebSocket calls, attaches to the Node.js and Python runtimes, drives a mobile app on an emulator and runs CLI programs in a terminal. Every platform you turn on that matches the changed files is verified in the same pass.
Root cause, then the fix
IronBee does not stop at what the page did. Evidence, OpenTelemetry spans and your code go into one analysis that names a file, a line and a reason. The agent applies the fix and IronBee verifies again.
The proof outlives the session
Every run is kept in the Console with its verdict, recording, actions, network requests, traces and logs. A reviewer replays what was checked instead of taking the agent’s word for it.
Flows you can save and replay
A flow you care about can be saved as a scenario without writing test code: captured once against the running app, kept in the repo for the whole team and replayed on demand. When the code changes, one command re-validates the saved scenarios and repairs the ones that drifted.
Question by question
| Question | IronBee | Playwright MCP |
|---|---|---|
| What it is | An AI QA engineer: it verifies each change on the real app and returns a verdict with evidence. | A browser automation tool that an agent can call. |
| What gets checked | What the change can reach, worked out from the diff. | Whatever the agent or the prompt decides to try. |
| What makes the agent verify | A completion hook. In enforce mode it runs verification before the agent can finish a code change, and a pass needs tool evidence. | Nothing in the server. It runs when the agent calls it. |
| Beyond the browser | Backend calls, the Node.js and Python runtimes, a mobile emulator and the terminal. | It automates browsers. |
| When a check fails | A root cause down to a file and a line. The agent applies the fix and IronBee verifies again. | The agent is left to work out the cause. |
| Evidence | Every run is kept in the Console: recording, actions, network requests, traces and logs. | Returned to the agent. Saving a trace or a video is opt-in, to a local folder. |
| Pull requests and previews | Built in: a check on GitHub and Vercel and a card on the Netlify deploy summary, with no agent session open. | It reports to the agent that called it. |
IronBee or Playwright MCP, answered.
What people ask when their agent already has a browser.
Yes, for verifying what a coding agent changed. Playwright MCP gives the agent a browser and leaves the rest to it. IronBee brings its own browser tools and adds what verification needs: it starts from the change, can hold the agent until the change is verified, keeps a record of every run and reports on the pull request.