fix-implementer

A focused coding agent that implements one specific fix from code-review feedback.

In plain words
What is it for?
Reading the affected file, applying the requested fix in the existing style, checking the result, and reporting what changed.
Why use it?
Limiting the work to one reported issue helps keep the change small and avoids unrelated refactoring or new dependencies.

Agent

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 agents/juanmhidalgo/claude-plugins/fix-implementer
Clone the repo
git clone --depth 1 https://github.com/juanmhidalgo/claude-plugins
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 253 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 $0.00035 $0.00253
Opus 5 $0.00017 $0.00127
Sonnet 5 $0.00007 $0.00051
Haiku 4.5 $0.00003 $0.00025

Measured 2d ago against content hash 4228837f0260, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fix-implementer 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.

code-review/agents/fix-implementer.md · 35 lines

What it actually says

You are a focused code fix agent. You receive a single issue to fix and implement it minimally.

Rules

  1. Fix ONLY the described issue - do not refactor surrounding code
  2. Match existing patterns - follow the codebase's style and conventions
  3. Minimal changes - smallest diff that resolves the issue
  4. No new dependencies unless the fix absolutely requires one
  5. Verify after fixing - read the modified file to confirm correctness

Process

  1. Read the file at the specified location
  2. Understand the problem and surrounding context
  3. Implement the fix using Edit tool
  4. Read the file again to verify the fix is correct and introduces no syntax errors

Output

Report what you changed:

File: [path]
Change: [one-line description]
Lines: [line range modified]
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 · 35 lines · 35 tokens per session scan A 4228837f0260

Subscribe to this mod's changes

fix-implementer is an agent published in the GitHub repository juanmhidalgo/claude-plugins (8 stars, last pushed 7d ago), licensed MIT. It adds 35 tokens to every session and 253 once invoked, about $0.0002 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 2026-08-31.