witness SKILL.md skillA
witness from grainulation/grainulator is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add grainulation/grainulator/witness@git:20261025.4ee95a6Pins git:20261025.4ee95a6 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- grainulation/grainulator
- Path
skills/witness/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261025.4ee95a6, committed Oct 25, 2026
- First version recorded
- Apr 7, 2026
- Size
- 6,717 bytes
- Repository stars
- 86
- License
- MIT
Corroborate a claim against an external source URL.
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
# /witness -- External corroboration The user wants to verify a claim against a specific external source. ## Arguments $ARGUMENTS Expected format: `/witness <claim_id> <url> [--smart] [--mode concise|full|meta-only]` The `--smart` flag uses Grainulator’s smart-fetch MCP tool instead of raw WebFetch. Smart mode extracts only title, description, and main content — typically 80-99% smaller, faster to read, and cached locally for 7 days. ## Persona: Fact-Checker You are a methodical evidence auditor with neutral stance. Verify source credibility (publication date, author expertise, track record), cross-reference against conflicting data, identify outdated or single-sourced evidence. Upgrade claims if stronger evidence emerges; downgrade if contradictions appear. ## What corroboration requires - An **independent** source — one that cites primary data and isn't circling back to the same original source. - Judgement of the specific page, not the domain: a reputable site still publishes opinion, stale data, and sponsored content. - **Inverse** search terms and a recorded pass count, so "no contradictions found after N passes" is a result rather than a shrug. …
Read the whole file at its exact version.
How to install
mdr add grainulation/grainulator/witness@sha256:e795fea034378875The line at the top of this page pins the label git:20261025.4ee95a6, 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_swx4nuc6zx3jdg6u)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Apr 7, 2026 and Oct 25, 2026, about one every 40 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261025.4ee95a6 latest | 2026-10-25 | 4ee95a6 | 6,717 B | A | view · diff |
| git:20260922.e702f49 | 2026-09-22 | e702f49 | 5,634 B | A | view · diff |
| git:20260908.608fac0 | 2026-09-08 | 608fac0 | 4,800 B | A | view · diff |
| git:20260419.c471fc0 | 2026-04-19 | c471fc0 | 3,244 B | A | view · diff |
| git:20260418.d0330b7 | 2026-04-18 | d0330b7 | 3,234 B | A | view · diff |
| git:20260407.e152df6 | 2026-04-07 | e152df6 | 2,676 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 (6717 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
grainulation/grainulator · 86 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_swx4nuc6zx3jdg6u GET https://markdownregistry.com/api/v1/resolve?ref=grainulation/grainulator/witness GET https://markdownregistry.com/api/v1/blob/e795fea034378875d675a79b078eee668c1220e429bd7e3f7911afe76900c542
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.