simplify

Removes over-engineering and complexity creep from code with an AST codemod (recast, not regex).

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Parameters

Returns

{
  changed
  fixed
  diff        unified
  applied[]
  skipped[]
  warnings[]
}

Description

Removes over-engineering and complexity creep from code with an AST codemod (recast, not regex).

The complexity counterpart to apply_fix. Auto-applies the provably-safe, behavior-preserving cases and proposes the judgment calls:

• no-unneeded-boolean-ternary (auto): "c ? true : false" becomes "!!c", "c ? false : true" becomes "!c"
• no-useless-fragment (auto): a Fragment wrapping a single element is unwrapped to that element
• usememo-empty-deps / usecallback-empty-deps (proposed in skipped, not rewritten): memoization with an empty dependency array, where the safe fix depends on intent

Parameters:

• code (required): the source to simplify (TSX/JSX)
• rules (optional): restrict to specific rule ids (default: all)

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Defined in packages/mcp/src/tools.ts. The request handler lives alongside its registration in packages/mcp/src/tools/.