Simplify Extension

Registers a /simplify command that reviews all git-changed files for code reuse, quality, and efficiency — then fixes any issues found.

Ported from the simplify skill for Claude Code.

Usage

/simplify
/simplify <additional focus>

Examples:

/simplify
/simplify focus on performance and memory usage
/simplify pay extra attention to React re-renders

Structure

• index.ts — extension entrypoint, registers the /simplify command

How It Works

Running /simplify injects a structured prompt into the conversation that drives a three-phase review:

Phase 1 — Identify Changes

Runs git diff (or git diff HEAD for staged changes) to get the full diff. Falls back to recently modified files if no git changes are present.

Phase 2 — Parallel Review (3 agents)

Three sub-agents run concurrently, each receiving the full diff:

Agent	Focus
Code Reuse	Flags duplicated logic, hand-rolled utilities that shadow existing helpers, and inline patterns that should use shared abstractions
Code Quality	Detects redundant state, parameter sprawl, copy-paste blocks, leaky abstractions, stringly-typed code, unnecessary JSX nesting, and low-value comments
Efficiency	Catches unnecessary work, missed concurrency, hot-path bloat, recurring no-op updates, TOCTOU existence checks, memory leaks, and overly broad data fetches

Phase 3 — Fix & Summarize

Aggregates findings from all three agents, applies fixes directly, skips false positives, and prints a brief summary of what changed (or confirms the code was already clean).

Optional Focus

Pass extra instructions after the command to steer the review:

/simplify pay close attention to SQL query efficiency

This appends an Additional Focus section to the prompt, which all agents will take into account.