reproduce-bug SKILL.md skillB
reproduce-bug from trailofbits/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add trailofbits/skills/reproduce-bug@git:20261020.a313174Pins git:20261020.a313174 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- trailofbits/skills
- Path
plugins/patching-bugs/skills/reproduce-bug/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261020.a313174, committed Oct 20, 2026
- Size
- 2,899 bytes
- Repository stars
- 8,043
- License
- CC-BY-SA-4.0
Use when a named runtime or compiler bug in a local repository needs independent reproduction.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Reproduce Bug ## When to Use Use for the reproduction step of `patching-bugs` with one `finding.json` and a local baseline checkout. Read the [record contract](../../references/records.md). Before target commands, follow its [project guidance](../../references/records.md#project-guidance). ## When NOT to Use Do not use for bug discovery, patching, or a claim that cannot be exercised locally. Report a blocker when the build or environment cannot exercise the claim. ## Procedure 1. Select `failure_type` from the record contract. Build the current baseline with the project's own command. Exercise the planned scoped inputs before any edit and retain their observations, including valid controls. Save raw stdout, stderr, exit status, and timing. If the behavior is absent with trustworthy evidence, report `not_reproduced`; if setup or observations are unreliable, report `blocked`. 2. Runtime: exercise the built `target_artifact` with a PoC that records `PATCH_LOADED` as defined in the contract, then prints `PATCH_REACHED` immediately before the assertion. Exit nonzero for the bug, zero otherwise; a setup crash is inconclusive. …
Read the whole file at its exact version.
How to install
mdr add trailofbits/skills/reproduce-bug@sha256:af835d87fd4598adThe line at the top of this page pins the label git:20261020.a313174, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_llwb5lj2dav5vyny)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 20, 2026.
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2899 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
trailofbits/skills · 8,043 stars · license CC-BY-SA-4.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_llwb5lj2dav5vyny GET https://markdownregistry.com/api/v1/resolve?ref=trailofbits/skills/reproduce-bug GET https://markdownregistry.com/api/v1/blob/af835d87fd4598ad5f09f7b917c4b4914066523f7984b484f81566be7789d513
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from trailofbits/skills
Every file in trailofbits/skills