Evidence-first local MCP debugger for React, Vite, Next.js, Chromium, and Safari: reproduce, inspect, replay, and verify web bugs in one bounded workflow.
An evidence-first, local MCP debugger for web applications.
web-debug-mcp gives Codex and other MCP clients one bounded workflow for reproducing a web issue, inspecting browser and framework runtime state, collecting redacted evidence, and verifying the same flow after a fix. It covers the browser, frontend runtime, dev server, and replay timeline through one small MCP surface.
The core package is a standalone MCP server. The repository also includes an optional Web Debug plugin for Codex and ChatGPT: the MCP server provides callable debugging tools, while the bundled skill provides workflow guidance. Claude Code and other MCP clients can continue using the standalone server.
The published npm package runs locally over stdio and does not require a hosted service.
Codex CLI, desktop app, and IDE extension
The Codex desktop app and IDE extension share the same MCP configuration. You can also open Settings → MCP servers → Add server, choose STDIO, use npx as the command, and add these arguments:
For a project-scoped Codex configuration, add this to ~/.codex/config.toml or a trusted project .codex/config.toml:
Verify the connection with codex mcp list. In the Codex TUI, /mcp shows the active server.
This is the recommended single-install path for Codex and Claude Code. Installing Web Debug installs both the workflow skill and the web-debug-mcp MCP server connection. It is not a skill-only package, and no separate MCP setup is required.
From the project README.
Add the radar badge to your README — it shows your project was picked up by MCP Radar and links to this page:
[](https://mcp.liqiwa.com/s/MarlonJD--web-debug-mcp.html)
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