mcp-debugger
Connects AI agents to debugpy, js-debug, CodeLLDB, Delve, JDI, and netcoredbg through the Debug Adapter Protocol. Exposes operations like create_debug_session, set_breakpoint, step_over, and get_variables as MCP tools with structured JSON responses. Ships with 1266+ tests and runs via npx with zero runtime dependencies. Reach for this when you want Claude to step through Python, JavaScript, Rust, Go, Java, or .NET code instead of just reading it. The mock adapter lets you test integration logic without spinning up actual debuggers. Available as npm package or Docker image, though Rust debugging needs local deployment to access your toolchain.
- GitHub stars
- 186
- tools
- 29
- transport
- STDIO
- last updated
- Oct 31, 2026
Tools
29 toolsPublic tool metadata for what this MCP can expose to an agent.
create_debug_sessionCreate a new debugging session
Create a new debugging session
No parameter schema in public metadata yet.
list_debug_sessionsList all active sessions
List all active sessions
No parameter schema in public metadata yet.
list_supported_languagesShow available language adapters
Show available language adapters
No parameter schema in public metadata yet.
set_breakpointSet a breakpoint in a file
Set a breakpoint in a file
No parameter schema in public metadata yet.
list_breakpointsList a session's breakpoints with verified state
List a session's breakpoints with verified state
No parameter schema in public metadata yet.
remove_breakpointRemove a breakpoint by id or file+line
Remove a breakpoint by id or file+line
No parameter schema in public metadata yet.
clear_breakpointsRemove all breakpoints (optionally per file)
Remove all breakpoints (optionally per file)
No parameter schema in public metadata yet.
start_debuggingStart debugging a script — or a failing test in one call (`testRunner: "pytest"`)
Start debugging a script — or a failing test in one call (`testRunner: "pytest"`)
No parameter schema in public metadata yet.
restart_debuggingRelaunch with the same config, breakpoints re-applied
Relaunch with the same config, breakpoints re-applied
No parameter schema in public metadata yet.
attach_to_processAttach debugger to a running process
Attach debugger to a running process
No parameter schema in public metadata yet.
detach_from_processDetach debugger from a process
Detach debugger from a process
No parameter schema in public metadata yet.
expose_sessionOpen a read-only DAP mirror endpoint so an IDE can attach and inspect
Open a read-only DAP mirror endpoint so an IDE can attach and inspect
No parameter schema in public metadata yet.
unexpose_sessionClose the mirror endpoint and disconnect IDE clients
Close the mirror endpoint and disconnect IDE clients
No parameter schema in public metadata yet.
get_stack_traceGet the current stack trace
Get the current stack trace
No parameter schema in public metadata yet.
list_threadsList all threads in the debug session
List all threads in the debug session
No parameter schema in public metadata yet.
get_scopesGet variable scopes for a frame
Get variable scopes for a frame
No parameter schema in public metadata yet.
get_variablesGet variables in a scope
Get variables in a scope
No parameter schema in public metadata yet.
get_local_variablesGet local variables in current frame
Get local variables in current frame
No parameter schema in public metadata yet.
step_overStep over the current line
Step over the current line
No parameter schema in public metadata yet.
step_intoStep into a function
Step into a function
No parameter schema in public metadata yet.
step_outStep out of a function
Step out of a function
No parameter schema in public metadata yet.
continue_executionContinue running
Continue running
No parameter schema in public metadata yet.
wait_for_stopBlock until the session next pauses or ends
Block until the session next pauses or ends
No parameter schema in public metadata yet.
pause_executionPause running execution
Pause running execution
No parameter schema in public metadata yet.
evaluate_expressionEvaluate expressions in debug context
Evaluate expressions in debug context
No parameter schema in public metadata yet.
get_source_contextGet source code context
Get source code context
No parameter schema in public metadata yet.
get_outputRead captured debuggee output (stdout/stderr)
Read captured debuggee output (stdout/stderr)
No parameter schema in public metadata yet.
close_debug_sessionClose a session
Close a session
No parameter schema in public metadata yet.
hot_reloadApply changed code to the running program and keep its state — Flutter hot reload, Java class redefinition (`redefine_classes` is a deprecated alias)
Apply changed code to the running program and keep its state — Flutter hot reload, Java class redefinition (`redefine_classes` is a deprecated alias)
No parameter schema in public metadata yet.
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mcp-debugger
A headless, agentic debugger over MCP — let your AI agents debug running programs in ten languages.
Details
- Repository
- github.com/debugmcp/mcp-debugger
- Website
- debugmcp.io
- Package
@debugmcp/mcp-debugger- Transport
- STDIO
- Registry
- MCP registry, active