MCPLab

App

Starting the App

Launch the MCPLab web UI and find your way around.

Launch the App

The mcplab app command starts a local web server and opens the UI in your browser.

basic launch
mcplab app
with options
mcplab app \
  --evals-dir ./evals \
  --runs-dir ./runs \
  --libraries-dir ./libraries \
  --port 3000 \
  --open

Default Directories

When directory flags are omitted, MCPLab looks in the current working directory for eval configs and uses ~/.mcplab/runs for run output.

  • --evals-dir defaults to the current working directory.
  • --runs-dir defaults to ~/.mcplab/runs.
  • --libraries-dir is optional. No library is loaded if omitted.