Claude Code mod
devtools
A debugger for Claude Code tool calls: breakpoints, pause/continue/reject/step, a timeline, an inspector, Error Lens failure diagnosis, a Permissions view of who refused each call and why, and sanitized trace exports.
Install
/plugin marketplace add NMenzel/claude-devtools-mod
/plugin install devtools@claude-devtools-modMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: writes files, reads files, reads settings, reads the transcript, reads mod state, persists state, draws
- Sees
- every tool call, classic hooks
- Draws in
PaneToolUseToolGroupAbovePrompt- Hooks
tool.calltool.checksession.startclassic.SessionStartcommand.runsession.appendui.render
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- NMenzel/claude-devtools-mod
- Folder
.- Marketplace
claude-devtools-mod- Author
- NMenzel
- License
- MIT
- Last updated
- 12 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is devtools?
A debugger for Claude Code tool calls: breakpoints, pause/continue/reject/step, a timeline, an inspector, Error Lens failure diagnosis, a Permissions view of who refused each call and why, and sanitized trace exports. It is a mod for Claude Code, from NMenzel/claude-devtools-mod on GitHub.
What can the devtools mod access?
Its widest reach is "writes or runs" (writes files, reads files, reads settings, reads the transcript, reads mod state, persists state, draws). It sees every tool call, classic hooks. It draws in Pane, ToolUse, ToolGroup, AbovePrompt. Like any mod, it runs with your permissions.
How do I install devtools?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add NMenzel/claude-devtools-mod and then /plugin install devtools@claude-devtools-mod.
Is devtools popular?
NMenzel/claude-devtools-mod has 3 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 12 October 2026.
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