Trace a Python function's full call tree from your cursor and view it as an
interactive graph, right inside VS Code.
Features
Right-click any function in a .py file and run Trace Call Graph from
Cursor to recursively walk everything it calls, using Pylance's Call
Hierarchy provider.
Renders the trace as an interactive graph (root highlighted, external /
library calls greyed out, cycles handled safely).
Hover a node to see its full signature (parameters and return type).
Click a node to jump straight to that function's definition in the editor.
Toggle external (stdlib / site-packages) calls on or off, and fit the graph
to the view.
Requirements
The Pylance
extension must be installed and active in your workspace — this extension
relies entirely on Pylance's Call Hierarchy provider to resolve calls.
A Python interpreter/virtual environment selected for the workspace, so
Pylance can resolve imports correctly.
Usage
Open a Python file and place your cursor on a function name.
Right-click and choose Trace Call Graph from Cursor (or run it from
the Command Palette).
A graph panel opens showing the call tree rooted at that function.
Known limitations
Traces are capped at 400 nodes to avoid runaway graphs on very large
codebases.
Dynamic dispatch, decorators, and heavy metaprogramming can cause Pylance's
call hierarchy to miss some calls — the graph is only as complete as what
Pylance itself resolves.
