reproducer

reproducer is a skill for Claude Code from apache/magpie. It costs 106 tokens per session (5,372 once invoked), scanned A, original, Apache-2.0.

A bug-reproduction tool for one issue that includes code from the reporter. It adapts that example to the current software, runs it, and records the observed result in a verdict file.

In plain words
What is it for?
Use it to check whether a code-level bug still occurs and compare the actual result with what the reporter expected.
Why use it?
It replaces guesswork about an old report with a repeatable test of the reported behaviour. It produces evidence without posting to or changing the issue tracker.

Skill for Claude Code ✓ vendor

Written for Claude Code: when-to-use in frontmatter. Also seen: mentions AGENTS.md.

Part of the magpie-issue plugin — 8 skills shipped together

Good fit Use it to check whether a code-level bug still occurs and compare the actual result with what the reporter expected.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/apache/magpie/reproducer
About the project

Apache Magpie is a framework of agent-assisted workflows for maintaining Apache software projects, including issue triage, pull-request review, contributor mentoring, and security-report handling. Apache maintainers and developers use it to delegate repetitive project work to coding agents while retaining human review. Its catalogue entries are the skills, instructions, plugin, and settings that implement these workflows.

apache/magpie · 120 stars · on GitHub · magpie.apache.org

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.

Any agent
npx skills add apache/magpie --skill reproducer
Clone the repo
git clone --depth 1 https://github.com/apache/magpie

Made for: Claude Code.

Or install magpie-issue, the plugin that ships this one along with the rest of its 8 skills.

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 reproducer

README.md
[![agentmods](https://agentmods.dev/badge/skills/apache/magpie/reproducer/github.svg)](https://agentmods.dev/skills/apache/magpie/reproducer)
Your own site
<a href="https://agentmods.dev/skills/apache/magpie/reproducer"><img src="https://agentmods.dev/badge/skills/apache/magpie/reproducer/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 reproducer

Your own site · 80×15
<a href="https://agentmods.dev/skills/apache/magpie/reproducer"><img src="https://agentmods.dev/badge/skills/apache/magpie/reproducer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 106 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,372 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 $0.00106 $0.05372
Opus 5.5 $0.00042 $0.02149
Sonnet 5.5 $0.00021 $0.01074
Haiku 4.5 $0.00011 $0.00537

Measured 5d ago against content hash eb6649ebd5e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

reproducer 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 5d 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.

plugins/magpie-issue/skills/reproducer/SKILL.md · 464 lines

How it starts

The opening of the file, as written. The whole thing — 464 lines — stays where its author put it; the contents beside it link to each section on GitHub.

issue-reproducer

Pre-flight — is this project set up?

Do this first, before anything else in this skill, and do it silently. One command answers it and carries its own rules; there is nothing else to read.

Run the checker with this skill's own frontmatter name: and surface_hash:, and one --requires for each requires_config: entry:

PYTHONPATH=".apache-magpie-local:$(git rev-parse --git-common-dir)/../.apache-magpie-local:$(git rev-parse --git-common-dir)/apache-magpie" \
  python3 -m setup_preflight --skill <name> --hash <surface_hash> [--requires <file>]...

The path finds the checker /magpie-setup:setup config installed in the personal layer: this checkout's .apache-magpie-local/, the main checkout's when this is a linked worktree, or the git directory's apache-magpie/ when Magpie is only installed.

  • {"verdict": "ok"} → silent. Continue into the work the user asked for and say nothing about pre-flight. This is the ordinary answer.
  • {"verdict": "action", ...} → each finding names a section, and rules carries that section's text. Follow it. The facts are the inputs; what to propose, and what may not be done, are in the rules rather than here. Act on a finding only through its rules.
  • The command did not run at all — no such module, a non-zero exit, no python3 — → never read that as a pass, and do not re-derive the check by hand: it lives in code so that there is one version of it. If the project has no .apache-magpie.lock, .apache-magpie-overrides/, or personal layer (any of the three directories above), nothing has been set up here and there is nothing to reconcile — resolve this skill's requires_config: entries yourself (first match wins: .apache-magpie-local/<file>, the main checkout's .apache-magpie-local/<file>, <git-common-dir>/apache-magpie/<file>, then .apache-magpie-overrides/<file>), stay silent if they all resolve, and run /magpie-setup:setup config for this skill if any does not, which also installs the checker. Otherwise the project is set up and its checker is missing or stale: say so, propose /magpie-setup:setup config to install it or /magpie-setup:setup upgrade to refresh it, and carry on with the work.

Read the full file on GitHub · 464 lines

Files

What ships with it

6 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. 5d ago Changed · +2 lines eb6649ebd5e4
  2. 15d ago Changed · +13 lines 86d6b7eabb2a
  3. 21d ago Changed · -9 lines 8f2d7a732673
  4. 23d ago Changed · -129 lines 4a6ee9d2b97c
  5. 24d ago Changed · +1 lines 84b6500e0952
  6. 27d ago Changed · -4 tokens per session 59687205d359
  7. 28d ago Changed · -94 lines c954bde7ebfd
  8. 1mo ago Changed · +33 lines c119b039f2ed
  9. 1mo ago First seen · 647 lines · 110 tokens per session scan A a4c86a13b067

Subscribe to this mod's changes

reproducer is a skill published in the GitHub repository apache/magpie (120 stars, last pushed today), licensed Apache-2.0. It adds 106 tokens to every session and 5,372 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-14.

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