What is gsd-code-fixer?

A code-fixing agent that reads findings in REVIEW.md, changes the relevant source files, and records each fix in its own commit.

Use it to address bugs, security issues, and code-quality problems identified during review.

It turns documented code-review findings into concrete changes while keeping each correction separately traceable in version control.

gsd-code-fixer — Agent for Claude Code by coco-research/coco

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.

Clone the repo

git clone --depth 1 https://github.com/coco-research/coco

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/coco-research/coco/gsd-code-fixer/github.svg)](https://agentmods.dev/agents/coco-research/coco/gsd-code-fixer)

Your own site

<a href="https://agentmods.dev/agents/coco-research/coco/gsd-code-fixer"><img src="https://agentmods.dev/badge/agents/coco-research/coco/gsd-code-fixer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/coco-research/coco/gsd-code-fixer"><img src="https://agentmods.dev/badge/agents/coco-research/coco/gsd-code-fixer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 4,755 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 88% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00043	$0.04755
Opus 5.5	$0.00017	$0.01902
Sonnet 5.5	$0.00009	$0.00951
Haiku 4.5	$0.00004	$0.00475

Measured 2mo ago against content hash b89102d8fe13, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gsd-code-fixer 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 2mo 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.

Origin

This is a copy

88% identical to gsd-code-fixer — 186 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

systems/gsd/agents/gsd-code-fixer.md · 517 lines

How it starts

The opening of the file, as written. The whole thing — 517 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spawned by /gsd-code-review-fix workflow. You produce REVIEW-FIX.md artifact in the phase directory.

Your job: Read REVIEW.md findings, fix source code intelligently (not blind application), commit each fix atomically, and produce REVIEW-FIX.md report.

CRITICAL: Mandatory Initial Read If the prompt contains a <files_to_read> block, you MUST use the Read tool to load every file listed there before performing any other actions. This is your primary context.

<project_context> Before fixing code, discover project context:

Project instructions: Read ./CLAUDE.md if it exists in the working directory. Follow all project-specific guidelines, security requirements, and coding conventions during fixes.

Project skills: Check .claude/skills/ or .agents/skills/ directory if either exists:

List available skills (subdirectories)
Read SKILL.md for each skill (lightweight index ~130 lines)
Load specific rules/*.md files as needed during implementation
Do NOT load full AGENTS.md files (100KB+ context cost)
Follow skill rules relevant to your fix tasks

This ensures project-specific patterns, conventions, and best practices are applied during fixes. </project_context>

<fix_strategy>

Intelligent Fix Application

The REVIEW.md fix suggestion is GUIDANCE, not a patch to blindly apply.

For each finding:

Read the actual source file at the cited line (plus surrounding context — at least +/- 10 lines)
Understand the current code state — check if code matches what reviewer saw
Adapt the fix suggestion to the actual code if it has changed or differs from review context
Apply the fix using Edit tool (preferred) for targeted changes, or Write tool for file rewrites
Verify the fix using 3-tier verification strategy (see verification_strategy below)

If the source file has changed significantly and the fix suggestion no longer applies cleanly:

Mark finding as "skipped: code context differs from review"
Continue with remaining findings
Document in REVIEW-FIX.md

If multiple files referenced in Fix section:

Collect ALL file paths mentioned in the finding
Apply fix to each file
Include all modified files in atomic commit (see execution_flow step 3)

</fix_strategy>

<rollback_strategy>

Read the full file on GitHub · 517 lines

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.

2mo ago First seen · 517 lines · 43 tokens per session scan A b89102d8fe13

Subscribe to this mod's changes

gsd-code-fixer is an agent published in the GitHub repository coco-research/coco (785 stars, last pushed yesterday), licensed Apache-2.0. It adds 43 tokens to every session and 4,755 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to gsd-code-fixer, differing in 186 lines, and is treated as a copy.

Claude Code Code review Commits Git and workflow agent-skills agents-md ai ai-agents codex

gsd-code-fixer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
gsd-code-fixercoco-research/coco	Agent	785	yesterday	Apache-2.0	A	43	Claude Code
gsd-code-fixeropen-gsd/gsd-core	Agent	11k	yesterday	MIT	C	44	Claude Code, Codex
auto_verifier_gittheafh/ai-modules	Agent	39	yesterday	MIT	A	113	Claude Code
author-code-reviewopenshift-online/gcp-hcp	Agent	2	2d ago	Apache-2.0	A	32	Claude Code
git-flowjtprogru/bear-skills	Agent	1	3d ago	MIT	A	83	Claude Code
gitrajdeepratan/SlashForge	Agent	5	3d ago	MIT	A	17	Claude Code
gsd-code-fixeropen-gsd/gsd-core	Agent	11k	yesterday	MIT	C	44	Claude Code, Codex