bug_fix

A structured process for fixing software bugs: locate the problem, find its root cause, change the code, and check that the fix works. It requires a report covering the cause, code change, impact, and regression checks.

In plain words
What is it for?
Use it to investigate a reproducible bug, implement a targeted correction, assess its effects, and verify that related behavior still works.
Why use it?
It reduces the risk of applying a guess that hides the real problem or creates a new one. The required checks keep the fix focused and testable.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/aquifer-sea/pattern8/bug_fix
Any agent
npx skills add Aquifer-sea/pattern8 --skill bug_fix
Clone the repo
git clone --depth 1 https://github.com/Aquifer-sea/pattern8

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 346 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00025 $0.00346
Opus 5 $0.00013 $0.00173
Sonnet 5 $0.00005 $0.00069
Haiku 4.5 $0.00003 $0.00035

Measured 2d ago against content hash 140b0b5b42b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bug_fix scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/bug_fix/SKILL.md · 45 lines

What it actually says

Bug Fix

Constrains the Agent to follow the "locate → root cause analysis → fix → regression verification" structured process.

Step 1: Inversion (Requirements Alignment)

Before fixing a bug, you must check every item in assets/checklist.yaml.

Step 2: Generator (Generate Fix Report from Template)

Your output must strictly follow the format defined in assets/template.yaml. Must include: root cause analysis, fix plan, fix code (diff format), impact analysis, regression checklist. Vague suggestions like "try changing this" are not allowed.

Step 3: Tool Wrapper (Security Fence)

If you need to execute commands to reproduce or verify a bug, check references/security.yaml first. Do not execute any high-risk commands that could damage existing code or environment.

Step 4: Reviewer (Self-Audit Loop)

After fixing, audit your fix against references/guidelines.yaml. Key checks: does the fix address the root cause? Does it introduce new bugs? Is the diff minimal? Roll back and regenerate if non-compliant, up to 3 retries.

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 45 lines · 25 tokens per session scan A 140b0b5b42b5

Subscribe to this mod's changes

bug_fix is a skill published in the GitHub repository Aquifer-sea/pattern8 (49 stars, last pushed 5mo ago), licensed MIT. It adds 25 tokens to every session and 346 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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