doublecheck SKILL.md skillA
doublecheck from github/awesome-copilot is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add github/awesome-copilot/doublecheck@git:20260312.f391bc9Pins git:20260312.f391bc9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- github/awesome-copilot
- Path
skills/doublecheck/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260312.f391bc9, committed Mar 12, 2026
- First version recorded
- Mar 12, 2026
- Size
- 15,891 bytes
- Repository stars
- 40,941
- License
- MIT
Three-layer verification pipeline for AI output. Extracts verifiable claims, finds supporting or contradicting sources via web search, runs adversarial review for hallucination patterns, and produces a structured verification report with source links for human review.
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
# Doublecheck Run a three-layer verification pipeline on AI-generated output. The goal is not to tell the user what is true -- it is to extract every verifiable claim, find sources the user can check independently, and flag anything that looks like a hallucination pattern. ## Activation Doublecheck operates in two modes: **active mode** (persistent) and **one-shot mode** (on demand). ### Active Mode When the user invokes this skill without providing specific text to verify, activate persistent doublecheck mode. Respond with: > **Doublecheck is now active.** I'll verify factual claims in my responses before presenting them. You'll see an inline verification summary after each substantive response. Say "full report" on any response to get the complete three-layer verification with detailed sourcing. Turn it off anytime by saying "turn off doublecheck." Then follow ALL of the rules below for the remainder of the conversation: **Rule: Classify every response before sending it.** Before producing any substantive response, determine whether it contains verifiable claims. Classify the response: | Response type | Contains verifiable claims? | Action | …
Read the whole file at its exact version.
How to install
mdr add github/awesome-copilot/doublecheck@sha256:ea16d7eb9d144a1fThe line at the top of this page pins the label git:20260312.f391bc9, 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_5xvg65u6mzppxnns)
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Versions
The registry has recorded 2 versions of this file, all committed on Mar 12, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260312.f391bc9 latest | 2026-03-12 | f391bc9 | 15,891 B | A | view · diff |
| git:20260312.eb7d223 | 2026-03-12 | eb7d223 | 14,493 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (15891 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
- pass: No script tag
Source
github/awesome-copilot · 40,941 stars · license MIT · pushed 2026-11-09 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5xvg65u6mzppxnns GET https://markdownregistry.com/api/v1/resolve?ref=github/awesome-copilot/doublecheck GET https://markdownregistry.com/api/v1/blob/ea16d7eb9d144a1f8d6287695a71be900a37efda468e899af4016361b233bdc7
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 github/awesome-copilot
Every file in github/awesome-copilot