rijkvanzanten
Registry indexed
code-simplify
Review changed code for YAGNI, removable over-complexity, reuse, code quality, and efficiency, then apply worthwhile simplifications. Use when the user asks to simplify, clean up, tighten, de-hack recent changes, identify logic that can be dropped, or review whether added safegua
Overview
Review changed code for YAGNI, removable over-complexity, reuse, code quality, and efficiency, then apply worthwhile simplifications. Use when the user asks to simplify, clean up, tighten, de-hack recent changes, identify logic that can be dropped, or review whether added safeguards and edge-case handling are actually needed.
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Code Simplify
Review recent code changes with four lenses: YAGNI, reuse, quality, and efficiency. Fix concrete issues directly while preserving behavior exactly. Prefer readable, explicit code over overly compact cleverness, and avoid churn for style-only tweaks or speculative refactors. Always identify possible parts that can be dropped because they are too complicated for the actual goal or protect against overly specific edge cases.
Workflow
- Determine the review scope.
- If the user named a file, directory, function, or time window, use that scope and do not widen it.
- Otherwise, in a git repository, prefer the current branch diff against the Git Town parent branch:
CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
BASE_BRANCH=$(git-town config get-parent "$CURRENT_BRANCH" 2>/dev/null || true)
- If Git Town cannot resolve a parent, fall back to the branch upstream. If no base or upstream can be resolved, fall back to
git diff HEAD. - If there is no git delta, inspect the files the user mentioned or the files edited earlier in the conversation.
- If no non-empty scope is available, stop and ask what to simplify.
- Build full context before judging the code.
- Read the changed files.
- Search nearby modules and shared utilities for existing helpers before keeping new logic.
- Check the surrounding patterns so the cleanup matches the codebase instead of imposing a new style.
- Run the four review passes.
- If delegation is available and explicitly authorized, run the passes in parallel.
- Otherwise run them locally, one pass at a time, against the same scope.
- Keep a short candidate list of logic that may be removable, including checks, branches, fallbacks, normalization, special cases, options, wrappers, abstractions, and compatibility paths.
- Apply the worthwhile fixes.
- Change the code directly.
- Skip false positives or low-value churn without arguing with them.
- Drop removable complexity directly when evidence shows it is outside the goal, unreachable, redundant, or not worth the maintenance cost.
- If a drop candidate might change intended behavior or requires a product/API decision, do not remove it silently; report it as a possible drop with the decision needed.
- Verify the result.
- Run typecheck and lint when configured and reasonably scoped.
- Run tests scoped to changed paths when possible.
- Broaden checks when simplification touched shared utilities, heavily imported modules, data flow, or behavior-sensitive code.
- If no scoped test mechanism exists and the change has meaningful blast radius, run the full relevant suite.
- Do not weaken tests, assertions, or types to make verification pass. Fix the simplification or revert the specific simplification that caused the regression.
- Report what changed and any remaining risks.
Review Passes
YAGNI
- Challenge every new check, guard, fallback, abstraction, option, branch, and normalization step that was added by the current change.
- Keep it only if it is required by the user's stated goal, the current slice contract, existing product behavior, a real caller, a testable failure mode, or a repo convention that already applies here.
- Remove speculative safeguards for edge cases that are not reachable in the current flow, not part of the accepted scope, or not backed by evidence from the codebase.
- Identify over-specific edge-case protection, such as branches for impossible input shapes, future-only compatibility, defensive defaults no caller can hit, duplicate validation after a trusted boundary, or fallbacks for states the surrounding code already prevents.
- Identify over-complicated implementation shape, such as configuration knobs with one caller, abstractions around one behavior, multi-step normalization where a narrow input contract would do, or helpers that make the main path harder to understand.
- Tag drop candidates as
delete,stdlib,native,yagni, orshrinkwhen reporting them so the action is obvious. - Classify each serious candidate as
drop now,keep, orask. Drop it now only when the intended behavior is clear and evidence supports the removal. - Prefer the smallest implementation that makes the intended behavior work. Do not preserve complexity just because it seems generally defensive.
- If a safeguard is security-, data-loss-, permissions-, migration-, or compatibility-related, verify the concrete risk before removing it. Escalate if the risk is plausible but the requirement is unclear.
- When removing YAGNI code, keep the deletion behavior-preserving for the intended path and note any deliberately unsupported edge case in the final response.
Reuse
- Replace newly written helpers with existing utilities when the behavior already exists.
- Collapse hand-rolled string, path, env, parsing, or type-guard logic into established helpers.
- Remove duplicated functionality introduced under a new name.
- Prefer structural search or project tooling over plain text grep when proving something is unused.
Quality
- Remove redundant state, cached values, or effects when the value can be derived or invoked directly.
- Shrink parameter sprawl by restructuring instead of threading more flags through old APIs.
- Merge copy-paste variants into a shared abstraction when the abstraction stays clearer than the duplication.
- Tighten leaky abstractions and stringly-typed code when existing constants, unions, or boundaries already exist.
- Flatten nested conditionals, ternary chains, and deeply nested switches when guard clauses, early returns, lookup tables, or simple
else ifchains make the flow easier to verify. - Remove dead code, unused imports, unused exports, and unreachable branches when project tooling or a reliable search proves they are unused. Account for re-exports, dynamic imports, framework conventions, and public API surfaces; skip uncertain removals.
- Remove unnecessary wrapper elements in component-tree UI frameworks when the wrapper adds no layout, semantic, accessibility, or styling value and the child component can express the needed behavior directly.
- Delete comments that explain what the code does; keep only non-obvious why.
Efficiency
- Remove redundant work, duplicate reads, duplicate requests, and avoidable recomputation.
- Parallelize independent work when the surrounding code supports it cleanly.
- Trim new hot-path work in render, request, startup, polling, or event-heavy paths.
- Add change-detection guards for recurring updates so no-op cycles do not notify downstream consumers.
- Verify wrapper updater/reducer helpers preserve the project's no-change signal, such as same-reference returns, so callers' no-op guards actually work.
- Prefer doing the operation and handling failure over pre-checking existence when that removes a TOCTOU pattern.
- Remove unbounded data structures, missing cleanup, listener leaks, and avoidable retained state introduced by the change.
- Reduce overly broad reads or loads when only a narrow slice is needed.
Guardrails
- Prefer simplification over cleverness.
- Do not invent abstractions just to satisfy the review pass.
- Do not rewrite unrelated code.
- Preserve the existing architecture unless the current change clearly violates it.
- Do not remove docs, plans, rolling-wave artifacts, or other workflow/source-of-truth files just because they are not runtime code.
- Treat public exports and framework entrypoints conservatively; unused-looking code can be externally consumed.
- Escalate instead of forcing a risky refactor that would change behavior, broaden scope, or require a product decision.
Output
- Summarize what was already good, what was simplified, what was dropped as YAGNI, and which checks ran.
- Include a short
Possible dropssection when there are plausible removals that were not made because they need user/product/API confirmation. Use tags:delete,stdlib,native,yagni,shrink. - Omit
Possible dropswhen there are no meaningful candidates. - If the code was already clean enough, say so plainly.
- If checks were not run or could not run, say that explicitly.
File metadata
name: code-simplify description: Review changed code for YAGNI, removable over-complexity, reuse, code quality, and efficiency, then apply worthwhile simplifications. Use when the user asks to simplify, clean up, tighten, de-hack recent changes, identify logic that can be dropped, or review whether added safeguards and edge-case handling are actually needed.
View original text
--- name: code-simplify description: Review changed code for YAGNI, removable over-complexity, reuse, code quality, and efficiency, then apply worthwhile simplifications. Use when the user asks to simplify, clean up, tighten, de-hack recent changes, identify logic that can be dropped, or review whether added safeguards and edge-case handling are actually needed. --- # Code Simplify Review recent code changes with four lenses: YAGNI, reuse, quality, and efficiency. Fix concrete issues directly while preserving behavior exactly. Prefer readable, explicit code over overly compact cleverness, and avoid churn for style-only tweaks or speculative refactors. Always identify possible parts that can be dropped because they are too complicated for the actual goal or protect against overly specific edge cases. ## Workflow 1. Determine the review scope. - If the user named a file, directory, function, or time window, use that scope and do not widen it. - Otherwise, in a git repository, prefer the current branch diff against the Git Town parent branch: ```bash CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD) BASE_BRANCH=$(git-town config get-parent "$CURRENT_BRANCH" 2>/dev/null || true) ``` - If Git Town cannot resolve a parent, fall back to the branch upstream. If no base or upstream can be resolved, fall back to `git diff HEAD`. - If there is no git delta, inspect the files the user mentioned or the files edited earlier in the conversation. - If no non-empty scope is available, stop and ask what to simplify. 2. Build full context before judging the code. - Read the changed files. - Search nearby modules and shared utilities for existing helpers before keeping new logic. - Check the surrounding patterns so the cleanup matches the codebase instead of imposing a new style. 3. Run the four review passes. - If delegation is available and explicitly authorized, run the passes in parallel. - Otherwise run them locally, one pass at a time, against the same scope. - Keep a short candidate list of logic that may be removable, including checks, branches, fallbacks, normalization, special cases, options, wrappers, abstractions, and compatibility paths. 4. Apply the worthwhile fixes. - Change the code directly. - Skip false positives or low-value churn without arguing with them. - Drop removable complexity directly when evidence shows it is outside the goal, unreachable, redundant, or not worth the maintenance cost. - If a drop candidate might change intended behavior or requires a product/API decision, do not remove it silently; report it as a possible drop with the decision needed. 5. Verify the result. - Run typecheck and lint when configured and reasonably scoped. - Run tests scoped to changed paths when possible. - Broaden checks when simplification touched shared utilities, heavily imported modules, data flow, or behavior-sensitive code. - If no scoped test mechanism exists and the change has meaningful blast radius, run the full relevant suite. - Do not weaken tests, assertions, or types to make verification pass. Fix the simplification or revert the specific simplification that caused the regression. - Report what changed and any remaining risks. ## Review Passes ### YAGNI - Challenge every new check, guard, fallback, abstraction, option, branch, and normalization step that was added by the current change. - Keep it only if it is required by the user's stated goal, the current slice contract, existing product behavior, a real caller, a testable failure mode, or a repo convention that already applies here. - Remove speculative safeguards for edge cases that are not reachable in the current flow, not part of the accepted scope, or not backed by evidence from the codebase. - Identify over-specific edge-case protection, such as branches for impossible input shapes, future-only compatibility, defensive defaults no caller can hit, duplicate validation after a trusted boundary, or fallbacks for states the surrounding code already prevents. - Identify over-complicated implementation shape, such as configuration knobs with one caller, abstractions around one behavior, multi-step normalization where a narrow input contract would do, or helpers that make the main path harder to understand. - Tag drop candidates as `delete`, `stdlib`, `native`, `yagni`, or `shrink` when reporting them so the action is obvious. - Classify each serious candidate as `drop now`, `keep`, or `ask`. Drop it now only when the intended behavior is clear and evidence supports the removal. - Prefer the smallest implementation that makes the intended behavior work. Do not preserve complexity just because it seems generally defensive. - If a safeguard is security-, data-loss-, permissions-, migration-, or compatibility-related, verify the concrete risk before removing it. Escalate if the risk is plausible but the requirement is unclear. - When removing YAGNI code, keep the deletion behavior-preserving for the intended path and note any deliberately unsupported edge case in the final response. ### Reuse - Replace newly written helpers with existing utilities when the behavior already exists. - Collapse hand-rolled string, path, env, parsing, or type-guard logic into established helpers. - Remove duplicated functionality introduced under a new name. - Prefer structural search or project tooling over plain text grep when proving something is unused. ### Quality - Remove redundant state, cached values, or effects when the value can be derived or invoked directly. - Shrink parameter sprawl by restructuring instead of threading more flags through old APIs. - Merge copy-paste variants into a shared abstraction when the abstraction stays clearer than the duplication. - Tighten leaky abstractions and stringly-typed code when existing constants, unions, or boundaries already exist. - Flatten nested conditionals, ternary chains, and deeply nested switches when guard clauses, early returns, lookup tables, or simple `else if` chains make the flow easier to verify. - Remove dead code, unused imports, unused exports, and unreachable branches when project tooling or a reliable search proves they are unused. Account for re-exports, dynamic imports, framework conventions, and public API surfaces; skip uncertain removals. - Remove unnecessary wrapper elements in component-tree UI frameworks when the wrapper adds no layout, semantic, accessibility, or styling value and the child component can express the needed behavior directly. - Delete comments that explain what the code does; keep only non-obvious why. ### Efficiency - Remove redundant work, duplicate reads, duplicate requests, and avoidable recomputation. - Parallelize independent work when the surrounding code supports it cleanly. - Trim new hot-path work in render, request, startup, polling, or event-heavy paths. - Add change-detection guards for recurring updates so no-op cycles do not notify downstream consumers. - Verify wrapper updater/reducer helpers preserve the project's no-change signal, such as same-reference returns, so callers' no-op guards actually work. - Prefer doing the operation and handling failure over pre-checking existence when that removes a TOCTOU pattern. - Remove unbounded data structures, missing cleanup, listener leaks, and avoidable retained state introduced by the change. - Reduce overly broad reads or loads when only a narrow slice is needed. ## Guardrails - Prefer simplification over cleverness. - Do not invent abstractions just to satisfy the review pass. - Do not rewrite unrelated code. - Preserve the existing architecture unless the current change clearly violates it. - Do not remove docs, plans, rolling-wave artifacts, or other workflow/source-of-truth files just because they are not runtime code. - Treat public exports and framework entrypoints conservatively; unused-looking code can be externally consumed. - Escalate instead of forcing a risky refactor that would change behavior, broaden scope, or require a product decision. ## Output - Summarize what was already good, what was simplified, what was dropped as YAGNI, and which checks ran. - Include a short `Possible drops` section when there are plausible removals that were not made because they need user/product/API confirmation. Use tags: `delete`, `stdlib`, `native`, `yagni`, `shrink`. - Omit `Possible drops` when there are no meaningful candidates. - If the code was already clean enough, say so plainly. - If checks were not run or could not run, say that explicitly.
Review the source
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- License
- MIT
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Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- The SKILL.md excerpt is truncated, but the provided content is sufficient to evaluate the skill's purpose and workflow.
- The skill relies on Git Town for parent branch detection, but includes fallbacks, which is acceptable.
- Low GitHub adoption signal
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 13 GitHub stars
- Stars/forks activity: 13 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
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- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
Indexed
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- rijkvanzanten/rolling-wave-engineering
- License
- MIT
- Version
- 1.0.0
- Last GitHub push
- Aug 17, 2026
- Registry updated
- Sep 1, 2026
- Instruction path
- skills/code-simplify/SKILL.md
Version reported in registry metadata; check source releases before relying on it.
Quality
55/100
Promising
Trust
45/100
Do not auto-install
Audit
66/100
Needs review
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- The SKILL.md excerpt is truncated, but the provided content is sufficient to evaluate the skill's purpose and workflow.
- The skill relies on Git Town for parent branch detection, but includes fallbacks, which is acceptable.
- Low GitHub adoption signal
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 13 GitHub stars
- Stars/forks activity: 13 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "2mo since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"Low GitHub adoption signal",
"The SKILL.md excerpt is truncated, but the provided content is sufficient to evaluate the skill's purpose and workflow.",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision"
],
"agent_contract": {
"task_input": "Use code-simplify in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 57/100 High review required",
"Audit: 66/100 Needs review",
"Safety: 22/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "rijkvanzanten-code-simplify (code-simplify)",
"install_command": "npx skills add rijkvanzanten/rolling-wave-engineering --skill code-simplify",
"risk_summary": "Needs review; Blocked for auto-install; High review required",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "rijkvanzanten-code-simplify",
"task": "Use code-simplify in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/rijkvanzanten-code-simplify",
"api": "https://www.openagentskill.com/api/agent/skills/rijkvanzanten-code-simplify",
"audit": "https://www.openagentskill.com/skills/rijkvanzanten-code-simplify/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=rijkvanzanten-code-simplify&task=Use%20code-simplify%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20code-simplify%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20code-simplify%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/rijkvanzanten-code-simplify/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/rijkvanzanten-code-simplify"
}
}For the creator
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- rijkvanzanten
- Indexed by
- OpenAgentSkill community index
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