Code Simplify

Objective

Simplify code while preserving behavior, public contracts, and side effects. Favor explicit code and local clarity over clever or compressed constructs.

Scope Resolution

1. Verify repository context: git rev-parse --git-dir. If this fails, stop and tell the user to run from a git repository.
2. If user provides file paths/patterns or a commit/range, scope is exactly those targets.
3. Otherwise, scope is only session-modified files. Do not include other uncommitted changes.
4. If there are no session-modified files, fall back to all uncommitted tracked + untracked files:
   • tracked: git diff --name-only --diff-filter=ACMR
   • untracked: git ls-files --others --exclude-standard
   • combine both lists and de-duplicate.
5. Exclude generated/low-signal files unless requested: lockfiles, minified bundles, build outputs, vendored code.
6. If scope still resolves to zero files, report and stop.

Operating Rules

• Preserve runtime behavior exactly. Keep inputs, outputs, side effects, and error behavior stable.
• Prefer project conventions over personal preferences. Infer conventions from existing code, linters, formatters, and tests.
• Limit scope to user-requested files or recently modified code unless explicitly asked to broaden.
• Make small, reversible edits. Avoid broad rewrites when targeted simplifications solve the problem.
• Call out uncertainty immediately when behavior may change.

Workflow

1) Determine Scope

• Resolve target files using the "Scope Resolution" section above.

2) Build a Behavior Baseline

• Read surrounding context, not only changed lines.
• Identify invariants that must not change:
  • function signatures and exported APIs
  • state transitions and side effects
  • persistence/network behavior
  • user-facing messages and error semantics where externally relied on
• Note available verification commands (lint, tests, typecheck).

3) Apply Simplification Passes (in this order)

1. Control flow:
   • Flatten deep nesting with guard clauses and early returns.
   • Replace nested ternaries with clearer conditionals.
2. Naming and intent:
   • Rename ambiguous identifiers when local context supports safe renaming.
   • Separate mixed concerns into small helpers with intent-revealing names.
3. Duplication:
   • Remove obvious duplication.
   • Abstract only when at least two real call sites benefit and the abstraction reduces cognitive load.
4. Data shaping:
   • Break dense transform chains into named intermediate steps when readability improves.
   • Keep hot-path performance characteristics stable unless improvement is explicit and measured.
5. Type and contract clarity:
   • Add or tighten type annotations when they improve readability and safety without forcing broad churn.
   • Preserve external interfaces unless asked to change them.

4) Enforce Safety Constraints

• Do not convert sync APIs to async (or reverse) unless explicitly requested.
• Do not alter error propagation strategy unless behavior remains equivalent and verified.
• Do not remove logging, telemetry, guards, or retries that encode operational intent.
• Do not collapse domain-specific steps into generic helpers that hide intent.

5) Verify

• Run the narrowest useful checks first:
  • formatter/lint on touched files
  • targeted tests related to touched modules
  • typecheck when relevant
• If fast targeted checks pass, run broader checks only when risk warrants it.
• If checks cannot run, state what was skipped and why.

6) Report

Provide:

1. Scope touched (files/functions)
2. Key simplifications with concise rationale
3. Verification commands run and outcomes
4. Residual risks or assumptions

Simplification Heuristics

• Prefer explicit local variables over nested inline expressions when it reduces cognitive load.
• Prefer one clear branch per condition over compact but ambiguous condition trees.
• Keep function length manageable, but do not split purely for line count.
• Keep comments that explain intent, invariants, or non-obvious constraints.
• Remove comments that restate obvious code behavior.
• Optimize for the next maintainer's comprehension time, not minimum character count.

Anti-Patterns

• Do not perform speculative architecture rewrites.
• Do not introduce framework-wide patterns while simplifying a small local change.
• Do not replace understandable duplication with opaque utility layers.
• Do not bundle unrelated cleanups into one patch.

Stop Conditions

• Stop and ask for direction when:
  • simplification requires changing public API/contracts
  • behavior parity cannot be confidently verified
  • the code appears intentionally complex due to domain constraints
  • the requested scope implies a larger redesign rather than simplification

Output Contract

When presenting simplification results:

1. Show the exact files and regions changed.
2. Explain each meaningful change in one sentence focused on readability/maintainability gain.
3. Confirm behavior-preservation assumptions explicitly.
4. Summarize verification performed (or clearly state omissions).