refuter-reproduction

refuter-reproduction is an agent for Claude Code from momomuchu/make-no-mistakes. It costs 59 tokens per session (471 once invoked), scanned A, original, MIT.

A bug-fixing review agent that checks whether the original bug can be reproduced before trusting a claimed fix. It compares the same reproduction steps before and after the change and tests a nearby variation.

In plain words
What is it for?
It helps verify bug fixes using the original inputs, pre-fix and post-fix code, adjacent reproduction cases, and specific evidence such as file locations and rerun results.
Why use it?
It catches fixes that only hide the reported symptom or were never tested against a real failure. It also marks the check as not applicable when the task is not a bug fix.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the make-no-mistakes plugin — 5 skills, 6 agents, 2 hooks shipped together

Good fit It helps verify bug fixes using the original inputs, pre-fix and post-fix code, adjacent reproduction cases, and specific evidence such as file locations and rerun results.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/momomuchu/make-no-mistakes/refuter-reproduction
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/momomuchu/make-no-mistakes

Made for: Claude Code.

Or install make-no-mistakes, the plugin that ships this one along with the rest of its 5 skills, 6 agents, 2 hooks.

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.

agentmods badge for refuter-reproduction

README.md
[![agentmods](https://agentmods.dev/badge/agents/momomuchu/make-no-mistakes/refuter-reproduction/github.svg)](https://agentmods.dev/agents/momomuchu/make-no-mistakes/refuter-reproduction)
Your own site
<a href="https://agentmods.dev/agents/momomuchu/make-no-mistakes/refuter-reproduction"><img src="https://agentmods.dev/badge/agents/momomuchu/make-no-mistakes/refuter-reproduction/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.

agentmods 80×15 button for refuter-reproduction

Your own site · 80×15
<a href="https://agentmods.dev/agents/momomuchu/make-no-mistakes/refuter-reproduction"><img src="https://agentmods.dev/badge/agents/momomuchu/make-no-mistakes/refuter-reproduction.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 471 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 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 5.1 $0.00059 $0.00471
Opus 5 $0.00030 $0.00235
Sonnet 5 $0.00012 $0.00094
Haiku 4.5 $0.00006 $0.00047

Measured 11d ago against content hash 30aae2420965, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

refuter-reproduction 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 11d 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.

agents/refuter-reproduction.md · 43 lines

What it actually says

Refuter — Reproduction (bug fixes only)

Your only goal, on a bug-fix DoD: prove the fix kills the actual reported bug, not a look-alike. A "fix" that was never checked against a real reproduction is unfalsifiable and must not be trusted.

What "break it" means here

  • Take the DoD's own repro steps/inputs. Run them against the pre-fix state (checkout the parent commit, or revert the diff in a scratch copy) and confirm the bug actually reproduces there — if it doesn't, the "bug" was never real, or the repro is wrong; say so, don't guess.
  • Run the identical repro against the post-fix diff. If it still fails, or fails differently (same symptom, narrower trigger condition, error moved one layer down) — REFUTED.
  • Watch for a fix that patches the reported symptom while leaving the underlying cause live for a slightly different trigger — try at least one adjacent variant of the repro, not only the exact reported one.

Not applicable

If dod.lock.md's Goal is not a bug fix, this lens does not run. Return N/A explicitly — never fabricate a verdict to fill the slot, and never let its absence be read elsewhere as "reproduction was checked."

Evidence bar

Cite the exact repro command/input, its output against pre-fix code (fails) and post-fix code (passes) — both actually executed by you this pass, not inferred from a report.

Verdict

CONFIRMED / REFUTED / UNVERIFIABLE / N/A (non-bug-fix DoD only). Commit your verdict before reading any other refuter's output.

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. 11d ago First seen · 43 lines · 59 tokens per session scan A 30aae2420965

Subscribe to this mod's changes

refuter-reproduction is an agent published in the GitHub repository momomuchu/make-no-mistakes (8 stars, last pushed 2mo ago), licensed MIT. It adds 59 tokens to every session and 471 once invoked, about $0.0003 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.

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