Claude Code mod Claude DevTools

Permission rules decide whether a call may run. Claude DevTools lets you stop the agent at a point you choose, look at what it is about to do, and step through it: stop before any npm publish, whenever it touches src/auth/**, or on the next call after a failure.

Examples: /devtools-break command npm install pauses before any npm install. /bp command git push does the same, short. /devtools-break file src/auth/** pauses before reading or editing auth code. /devtools-break error Bash --action pause pauses the next call after a failed Bash call. /devtools opens the pane.

tool.check decides nothing: it passes every permission check on unchanged and reads the verdict to show it. tool.call records each call and holds it only when a breakpoint you set matches. command.run answers only its own commands (/devtools, /devtools-*, /bp, /bpl, /bpn, /bpc, /bpe). session.start and ui.render register the commands and draw the pane, the transcript gutter and the bar above the prompt.

It writes files only when you run /devtools-export or press Export: a .json (and .md) trace, by default in .claude-devtools/. Breakpoint rules and the debugger mode persist in the plugin store; the timeline stays in the session's memory.

Inside Claude Code, add the marketplace and install the mod. Then run /reload-plugins in an open session, or start a new one, and run /devtools. Run /plugin and look for devtools in the mods active line to check that it loaded.

Clone the repository and load it from the folder. Nothing needs to be built, and it needs no npm packages. To run its tests, run claude plugin test in the clone.