jCodeMunch — Auto Reindex + Risk Gutter (VS Code)

A small VS Code extension that does two things:

Auto-reindex on save — keeps jcodemunch-mcp's index fresh when you edit files outside Claude Code.
Risk-density gutter (new in 0.2.0) — paints a colored dot in the editor gutter at every risky function/method header. Hover for the per-axis breakdown; green is invisible (signal-to-noise stays high).

Why

Auto-reindex on save

Claude Code's PostToolUse hook handles auto-reindexing in its own ecosystem. VS Code-side MCP clients (GitHub Copilot Chat, Continue, Cline, Roo Code, …) don't fire those hooks — so when you edit a file in the editor and another session queries jCodeMunch, the second session sees a stale index. This extension closes the gap by listening for onDidSaveTextDocument and shelling out to jcodemunch-mcp index-file <path>.

Risk-density gutter

Most "show me dangerous code" features pick one signal — usually caller count. That's misleading: a well-tested utility with 47 callers is fine; a 47-caller method nobody's tested and just got rewritten is a landmine. The gutter shows the fused signal across four axes (complexity / exposure / churn / test_gap), color-coded by composite. Driven by jcodemunch-mcp file-risk <path> under the hood.

Refresh on file open + on save. Typing doesn't refresh — cyclomatic doesn't move with whitespace.

Two-line summary: green = invisible, yellow/orange/red = look here. Hover any decorated line to see why.

Requirements

VS Code 1.85+
jcodemunch-mcp >= 1.89.0 on PATH (the risk gutter requires file-risk from 1.89.0; auto-reindex works against any 1.81.0+)
A workspace folder that has been indexed at least once (jcodemunch-mcp index .)

Settings

Setting	Default	Purpose
`jcodemunch.indexOnSave.enabled`	`true`	Enable/disable auto-reindex
`jcodemunch.indexOnSave.command`	`jcodemunch-mcp`	Path to the CLI
`jcodemunch.indexOnSave.debounceMs`	`500`	Per-file debounce window
`jcodemunch.indexOnSave.exclude`	`[node_modules, .git, dist, build, .venv, venv, __pycache__, .min.]`	Glob patterns to skip
`jcodemunch.riskGutter.enabled`	`true`	Paint the per-symbol risk-density gutter
`jcodemunch.riskGutter.debounceMs`	`600`	Per-file debounce for the gutter refresh on save

Output appears in the jCodeMunch output channel (View → Output → jCodeMunch).

Install

From the VS Code marketplace:

ext install jgravelle.jcodemunch-mcp-vscode

Or via the Extensions panel — search for "jCodeMunch".

Build from source

cd vscode-extension
npm install
npm run compile
npx @vscode/vsce package
code --install-extension jcodemunch-mcp-vscode-0.1.0.vsix

Issues

File at https://github.com/jgravelle/jcodemunch-mcp/issues — tag area:vscode.