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  • Multi-language debug Node.js, Go, Rust (requires lldb-dap), Python, and PHP (via xdebug) using the Debug Adapter Protocol (DAP); language auto-detected from the project, or manually selected in the launch form
  • Step controls Continue, Step Over, Step In, Step Out, and Stop; controls are disabled while the program is running and re-enable on each pause
  • Call stack full stack trace on every pause; click any frame to load its local scope
  • Variables all in-scope variables grouped by scope (Locals, Superglobals, etc.) with syntax-colored values and expandable objects/arrays
  • Watch expressions add any expression to the Watch panel; evaluated at every pause using DAP context: watch; results update live and changed values are highlighted
  • Debug console program output (stdout/stderr), adapter messages, and REPL in one scrollable panel; each category is color-coded; the REPL evaluates arbitrary expressions in the current frame
  • Session recording every debug session is automatically recorded to ~/.coder/projects/{id}/debugger/{timestamp}.jsonl in NDJSON format (one JSON record per line); sessions with zero stops are discarded automatically so timing noise from xdebug reconnects never pollutes history
  • Export to Markdown / HTML export the full session — every stop, every variable, the complete call stack, and all console output — to a formatted .md or .html file; the exported file opens automatically as a new editor tab
  • Copy as AI-readable text one-click copy of the entire session as a clean, compact text summary ready to paste into any AI chat; noise is stripped (empty values, $_SERVER, $argv, $argc, constants scopes) and variables that changed between stops are flagged with *
  • Session history clock icon in the debugger header opens a modal listing every recorded session for the current project with language, entry-point filename, and timestamp; each entry has copy-as-text and export (MD/HTML) actions
  • Retry on dispose xdebug can close its socket before a new attach completes; the debugger retries automatically up to 3 times with escalating backoff (800 ms / 1600 ms) so a stale socket never blocks a fresh run
  • Toggle Cmd+Shift+D opens and closes the Debugger panel

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Requirements

The debugger connects to debug adapters you have installed — none of them ship with Coder. See Language Intelligence → DAP debuggers for the full per-language install table, including Rust/Zig’s lldb-dap setup (ships with the Xcode Command Line Tools via xcode-select --install, or brew install llvm) and the caveat that both require a binary you’ve already built yourself (cargo build / zig build) — the debugger doesn’t invoke either build tool for you.