source-verification

source-verification is a skill for Claude Code from ur-grue/autopunk-media-skills. It costs 82 tokens per session (12,002 once invoked), scanned A, original, MIT.

A structured source-checking process for claims, images, videos, documents, anonymous sources, and expert credentials. It also creates a record of the checks performed.

In plain words
What is it for?
It is for checking the origin and authenticity of media and documents, assessing sources and experts, and recording verification steps before publication.
Why use it?
Journalists can receive altered media, misleading documents, unverified identities, or claims from unreliable sources. This helps determine whether evidence is authentic and creates a paper trail for editorial or legal review.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the autopunk-media-skills plugin — 187 skills shipped together

Good fit It is for checking the origin and authenticity of media and documents, assessing sources and experts, and recording verification steps before publication.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ur-grue/autopunk-media-skills/source-verification
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 ur-grue/autopunk-media-skills --skill source-verification
Clone the repo
git clone --depth 1 https://github.com/ur-grue/autopunk-media-skills

Made for: Claude Code.

Or install autopunk-media-skills, the plugin that ships this one along with the rest of its 187 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 source-verification

README.md
[![agentmods](https://agentmods.dev/badge/skills/ur-grue/autopunk-media-skills/source-verification/github.svg)](https://agentmods.dev/skills/ur-grue/autopunk-media-skills/source-verification)
Your own site
<a href="https://agentmods.dev/skills/ur-grue/autopunk-media-skills/source-verification"><img src="https://agentmods.dev/badge/skills/ur-grue/autopunk-media-skills/source-verification/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 source-verification

Your own site · 80×15
<a href="https://agentmods.dev/skills/ur-grue/autopunk-media-skills/source-verification"><img src="https://agentmods.dev/badge/skills/ur-grue/autopunk-media-skills/source-verification.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12,002 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
SkillSpector: 1 finding, up to low

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • low Excessive Agency · line 554
    Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.
    Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
How audits are shown
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 $0.00082 $0.12002
Opus 5 $0.00041 $0.06001
Sonnet 5 $0.00016 $0.02400
Haiku 4.5 $0.00008 $0.01200

Measured 7d ago against content hash 12fbd7569b53, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

source-verification 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 7d 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.

skills/magazine-journalism/investigation/source-verification/SKILL.md · 591 lines

How it starts

The opening of the file, as written. The whole thing — 591 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Source Verification

What This Skill Does

Walks through structured verification of sources, claims, images, video, and documents across five verification modes — then produces a verification-trail template the reporter can file with the story or submit to legal review.

When To Use This Skill

  • A source has sent you a photo, video, or document and you need to confirm it is what they say it is before publishing
  • You are fact-checking a claim that rests on visual or documentary evidence
  • You want to verify the origin, date, or location of user-generated content found on social media
  • An anonymous source has provided information and you need to assess credibility without revealing their identity
  • Someone is presented as an expert and you need to verify their credentials, affiliations, and track record before quoting them
  • You received a document (memo, contract, letter, report) and need to determine whether it is authentic
  • You need a paper trail showing your newsroom's verification steps for legal or editorial review

What You Need To Provide

For visual media verification (images, video)

Required: Description of the image or video; the source's stated provenance (who sent it, when, what they say it shows) Optional: The file itself or a URL where it was found; any metadata already extracted; the publication deadline; whether the material will be used in a legal or regulatory context

For document verification

Required: Description of the document (type, date, issuing body); the source's stated provenance; why you believe it may need verification (unsolicited, unexpected content, anonymous origin) Optional: The document file; known reference documents from the same issuing body; any prior correspondence with the source

For anonymous source verification

Required: The claim the source is making; what the source says about their access to the information (position, proximity, how they obtained it); any corroborating material they have provided Optional: The channel through which the source made contact; any pattern of prior contact; whether the source has asked for specific protections (legal, physical safety)

Read the full file on GitHub · 591 lines

Files

What ships with it

1 file 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. 7d ago First seen · 591 lines · 82 tokens per session scan A 12fbd7569b53

Subscribe to this mod's changes

source-verification is a skill published in the GitHub repository ur-grue/autopunk-media-skills (30 stars, last pushed 10d ago), licensed MIT. It adds 82 tokens to every session and 12,002 once invoked, about $0.0004 per session on Opus 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 2026-09-04.