CO

coding-guidelines

Enforces strict coding principles to prevent common LLM mistakes and ensure maintainable code.

Install

mkdir -p .claude/skills/coding-guidelines && curl -L -o skill.zip "https://agentskills.codes/api/skills/download/8671" && unzip -o skill.zip -d .claude/skills/coding-guidelines && rm skill.zip

Installs to .claude/skills/coding-guidelines

Activation

This is the description your AI agent reads to decide when to run this skill — the better it matches your request, the more reliably it fires.

Behavioral guidelines to reduce common LLM coding mistakes. Use when writing, modifying, or reviewing code — implementation tasks, code changes, refactoring, bug fixes, or feature development. Do NOT use for architecture design, documentation, or non-code tasks.
262 chars✓ has a “when” triggerlonger than Claude Code's old 250-char listing cap (fine on current versions)
Beginner

Key capabilities

  • Surface assumptions before coding
  • Enforce simplicity in implementation
  • Restrict changes to surgical edits
  • Define verifiable success criteria

How it works

Applies behavioral rules to bias toward caution, requiring explicit assumptions and minimal code changes.

Inputs & outputs

You give it
Implementation task description
You get back
Surgical code change with verified success criteria

When to use coding-guidelines

  • Refactor code with minimal disruption
  • Ensure code matches existing style
  • Review implementation plans for clarity

About this skill

Coding Guidelines

Behavioral guidelines to reduce common LLM coding mistakes. These principles bias toward caution over speed—for trivial tasks, use judgment.

1. Think Before Coding

Don't assume. Don't hide confusion. Surface tradeoffs.

Before implementing:

  • State assumptions explicitly. If uncertain, ask.
  • If multiple interpretations exist, present them—don't pick silently.
  • If a simpler approach exists, say so. Push back when warranted.
  • If something is unclear, stop. Name what's confusing. Ask.
  • Disagree honestly. If the user's approach seems wrong, say so—don't be sycophantic.

2. Simplicity First

Minimum code that solves the problem. Nothing speculative.

  • No features beyond what was asked.
  • No abstractions for single-use code.
  • No "flexibility" or "configurability" that wasn't requested.
  • No error handling for impossible scenarios.
  • If you write 200 lines and it could be 50, rewrite it.

Ask yourself: "Would a senior engineer say this is overcomplicated?" If yes, simplify.

3. Surgical Changes

Touch only what you must. Clean up only your own mess.

When editing existing code:

  • Don't "improve" adjacent code, comments, or formatting.
  • Don't refactor things that aren't broken.
  • Match existing style, even if you'd do it differently.
  • If you notice unrelated dead code, mention it—don't delete it.

When your changes create orphans:

  • Remove imports/variables/functions that YOUR changes made unused.
  • Don't remove pre-existing dead code unless asked.

The test: Every changed line should trace directly to the user's request.

4. Goal-Driven Execution

Define success criteria. Loop until verified.

Transform tasks into verifiable goals:

  • "Add validation" → "Write tests for invalid inputs, then make them pass"
  • "Fix the bug" → "Write a test that reproduces it, then make it pass"
  • "Refactor X" → "Ensure tests pass before and after"

For multi-step tasks, state a brief plan:

1. [Step] → verify: [check]
2. [Step] → verify: [check]
3. [Step] → verify: [check]

Strong success criteria let you loop independently. Weak criteria ("make it work") require constant clarification.

When not to use it

  • Architecture design
  • Documentation tasks
  • Non-code tasks

Limitations

  • Not suitable for architecture design
  • Requires judgment for trivial tasks

How it compares

Prioritizes simplicity and surgical precision over speculative features or broad refactoring.

Compared to similar skills

coding-guidelines side by side with the closest alternatives in the catalog.

SkillInstallsUpdatedSafetyDifficulty
coding-guidelines (this skill)05moNo flagsBeginner
effective-go3239moNo flagsBeginner
solid-principles579moNo flagsIntermediate
typescript-review392moNo flagsIntermediate

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