---
title: "Focused Fix — Deep-Dive Feature Repair"
type: skill
id: "rezvani-skills/engineering-review/focused-fix"
category: "Engineering"
publisher: "Alireza Rezvani"
license: "MIT"
source: "https://github.com/alirezarezvani/claude-skills/tree/c85b17e"
canonical: "https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/focused-fix"
open_in_pho: "https://pho.chat/customize?item=rezvani-skills%2Fengineering-review%2Ffocused-fix&utm_source=labs&utm_medium=skill-page&utm_campaign=skills-library"
---

# Focused Fix — Deep-Dive Feature Repair

Use when a whole feature or module is broken and needs fixing end to end ('make X work', 'the Y module is broken'). Maps every file and dependency of the area before changing anything. Single quick bug fixes do not need it.

Source: Alireza Rezvani (MIT), copied at a pinned commit. Free to use. Part of the Phở Skills library (https://labs.pho.chat/en/skills).
Skill set: Engineering review (https://labs.pho.chat/en/skills/rezvani-skills/engineering-review.md).

## What it covers
- When to Use
- The Iron Law
- Protocol — STRICTLY follow these 5 phases IN ORDER
  - Phase 1: SCOPE — Map the Feature Boundary
  - Phase 2: TRACE — Map All Dependencies (Inside AND Outside)
  - Phase 3: DIAGNOSE — Find Every Issue
  - Phase 4: FIX — Repair Everything Systematically
  - Phase 5: VERIFY — Confirm Everything Works
- Red Flags — STOP and Return to Current Phase
- Common Rationalizations
- Anti-Patterns — NEVER do these
- Related Skills
- Quick Reference

## Other skills in this set
- [PR Review Expert](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/pr-review-expert.md): Review a pull request or diff for bugs, security and quality, file by file. Use whenever the user asks to review a PR or look over their changes.
- [Adversarial Code Reviewer](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/adversarial-reviewer.md): Tough, critical review of a diff or PR before merge, through hostile reviewer personas that catch shared blind spots. Use whenever the user wants a change torn apart, a harsh second opinion, or a…
- [Database Schema Designer](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/database-schema-designer.md): Use when asked for an ERD, table relationships, normalization or a schema migration plan. Produces the ERD and normalized DDL with migration steps.
- [API Test Suite Builder](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/api-test-suite-builder.md): Use when asked to write API, integration or contract tests for REST endpoints. Builds the suite from the routes: happy paths, auth, validation errors and edge cases per endpoint.
- [Security Guidance Hook](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/security-guidance.md): Use when installing or tuning the PreToolUse security hook that warns before Claude writes command injection, XSS, SQL injection, unsafe deserialization, eval or GitHub Actions injection. Warns once…
- [Stripe Integration Expert](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/stripe-integration-expert.md): Use for any Stripe integration: subscriptions, trials, proration, checkout, usage billing, webhooks, customer portal or invoicing in Next.js, Express or Django. Writes idempotent webhook handlers…
- [LLM Cost Optimizer](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/llm-cost-optimizer.md): Use whenever an LLM feature is being built or its costs come up (model choice, prompt caching, token limits, per-feature spend). Sets routing, caching, max_tokens and cost logging before launch…
- [Prompt Governance](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/prompt-governance.md): Use when prompts run in production and need versioning, a registry, A/B tests, regression checks or an eval pipeline. Sets up the release process for prompts; single-prompt quality…
- [Zero-Hallucination Coder](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/zero-hallucination-coder.md): Use before high-stakes or multi-file coding (auth, databases, migrations), or when asked to plan carefully and avoid invented APIs. Runs discuss, map, decompose, execute and verify, checking every…
- [Embedded / IoT Mentor](https://labs.pho.chat/en/skills/rezvani-skills/engineering-review/embedded-iot-mentor.md): Use for any embedded or IoT hardware project (ESP32, STM32, Arduino, Pico, firmware, PCB, MQTT, Home Assistant, sensor dashboards), before buying parts. Picks the MCU, board and toolchain, decides…

## Use it
- In Phở: open https://pho.chat/customize?item=rezvani-skills%2Fengineering-review%2Ffocused-fix&utm_source=labs&utm_medium=skill-page&utm_campaign=skills-library and press Try, or add it so Phở loads it whenever a request matches. Phở works with your own API key (OpenAI, Anthropic, Google and others).
- Full instructions (original SKILL.md, unchanged): https://labs.pho.chat/skills/raw/rezvani-skills/engineering-review/skills/focused-fix/SKILL.md
- Original files: https://github.com/alirezarezvani/claude-skills/tree/c85b17e (MIT).
- Full machine-readable index: https://labs.pho.chat/skills.json