Debugger MCP server

Read from the package source without running it. The installed server may list more.

• debugger_add_watch

  Add an expression to the watch list. The expression will be evaluated each time the process pauses.

• debugger_continue

  Resume execution of a paused debug session until the next breakpoint or program termination.

• debugger_detect_hangwrite action

  Run a command and detect if it hangs or enters an infinite loop. Returns hang status, location, and stack trace if hung.

• debugger_get_global_variables

  Get global variables accessible from the current scope with their names, values, and types.

• debugger_get_local_variables

  Get all local variables in the current scope with their names, values, and types.

• debugger_get_performance_metrics

  Get performance metrics including current memory usage, performance timeline, and leak detection.

• debugger_get_stack

  Get the current call stack with function names, file locations (absolute paths), and line numbers.

• debugger_get_watches

  Get all watched expressions with their current values. Reports value changes since the last pause.

• debugger_inspect

  Evaluate a JavaScript expression in the current execution context and return the result with type information.

• debugger_inspect_object

  Inspect an object by its object reference, returning properties with values. Handles nested objects and arrays up to a specified depth.

• debugger_list_breakpoints

  Get all breakpoints for a debug session with their file, line, condition, and enabled state.

• debugger_pause

  Pause a running debug session and return the current execution location.

• debugger_remove_breakpointwrite action

  Remove a breakpoint from the debug session.

• debugger_remove_watchwrite action

  Remove an expression from the watch list.

• debugger_set_breakpoint

  Set a breakpoint at a specific file and line number. Optionally provide a condition.

• debugger_set_exception_breakpoint

  Set an exception breakpoint to pause on caught and/or uncaught exceptions.

• debugger_set_function_breakpoint

  Set a function breakpoint to pause when a function with the given name is called.

• debugger_set_hit_count_condition

  Set a hit count condition for a breakpoint. The breakpoint will only pause when the condition is met.

• debugger_set_logpoint

  Set a logpoint that logs a message without pausing execution. Use {variable} syntax for interpolation.

• debugger_start

  Start a new debug session with a Node.js process. The process will be paused at the start.

• debugger_start_cpu_profile

  Start CPU profiling for a debug session. Collects CPU profile data for performance analysis.

• debugger_step_intowrite action

  Execute the current line and pause at the first line inside any called function.

• debugger_step_outwrite action

  Execute until the current function returns and pause at the calling location.

• debugger_step_overwrite action

  Execute the current line and pause at the next line in the same scope.

• debugger_stop_cpu_profile

  Stop CPU profiling and return the profile data with bottleneck analysis.

• debugger_stop_session

  Stop a debug session, cleanup all resources, and kill the process if still running.

• debugger_switch_stack_frame

  Switch the execution context to a specific stack frame by index. Frame 0 is the top frame (current location).

• debugger_take_heap_snapshot

  Take a heap snapshot for memory analysis. Returns memory usage report.

• debugger_toggle_breakpoint

  Toggle a breakpoint between enabled and disabled states.

• Code scan18 source files scanned25/25
• –Live reliabilityno gateway calls yet and no remote to proben/a
• –Tool poisoningtools not inspected (local package is not executed); not countedn/a
• Auth qualitylocal package, no credentials required12/15
• Maintenancelast push 187 days ago4/15
• Maintainer identityregistry namespace matches repository owner; GitHub account older than a year9/10

Safety score

77/100

higher than 50% of 48,255 servers

Tools

29

the typical server has 7

Tools that change things

21%

typical: 0%. Fewer write tools means less an agent can break

GitHub stars

2

more than 75% of 28,688 servers

Debugger: common questions

Is Debugger MCP server safe?

Mostly: it is graded B (77/100). Read the Debugger safety report

How do I install Debugger?

It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.

Does Debugger need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is Debugger maintained?

The last commit was 221 days ago (2026-03-28). The latest release is v1.1.8.

How does Debugger compare with other MCP servers?

safety score 77/100 (higher than 50% of 48,255 servers); tools 29 (the typical server has 7); tools that change things 21% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.