witness skillA
witness is agent-read markdown (skill) from grainulation/grainulator: Corroborate a claim against an external source URL..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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credibility (publication date, author expertise, track record), cross-reference against conflicting data, identify outdated or single-sourced evidence.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@git:20260922.e702f49mdr add grainulation/grainulator/witness@sha256:9257d493b2106bddPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_swx4nuc6zx3jdg6u)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260922.e702f49 latest | 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 (5634 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 2026-09-22 · 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/9257d493b2106bddcca8b76f91df3c90d1b8708c0db1ca3aa263d45df5038ea9
Your agent 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.