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verify-content-credentials

verify-content-credentials is a skill for Codex from Neeeophytee/ai-watermarks-reality-check. It costs 57 tokens per session (617 once invoked), scanned A, original, AGPL-3.0.

A verification guide for C2PA Content Credentials, which are signed metadata showing an asset’s origin and editing history. It uses the official c2patool to check whether a credential exists, is cryptographically intact, and comes from a trusted signer.

In plain words
What is it for?
Use it to validate image, video, or other local assets before relying on their content-history records.
Why use it?
It separates real credential verification from unreliable checks for marker bytes in a file. It also explains cases where verification must happen offline or the verifier is unavailable.

Skill for Codex

Written for Codex: agents/openai.yaml present.

not rated 16repo 2mo ago A scan 57 tokens AGPL-3.0

Good fit Use it to validate image, video, or other local assets before relying on their content-history records.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials
View source ↗ Neeeophytee/ai-watermarks-reality-check
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 Neeeophytee/ai-watermarks-reality-check --skill verify-content-credentials
Clone the repo
git clone --depth 1 https://github.com/Neeeophytee/ai-watermarks-reality-check

Made for: Codex.

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 verify-content-credentials

README.md
[![agentmods](https://agentmods.dev/badge/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials/github.svg)](https://agentmods.dev/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials)
Your own site
<a href="https://agentmods.dev/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials"><img src="https://agentmods.dev/badge/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials/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 verify-content-credentials

Your own site · 80×15
<a href="https://agentmods.dev/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials"><img src="https://agentmods.dev/badge/skills/neeeophytee/ai-watermarks-reality-check/verify-content-credentials.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 617 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.
Origin unknown 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 $0.00057 $0.00617
Opus 5.5 $0.00023 $0.00247
Sonnet 5.5 $0.00011 $0.00123
Haiku 4.5 $0.00006 $0.00062

Measured 2mo ago against content hash 944a7a9fa09f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

verify-content-credentials 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/provenance_core.py, scripts/verify_c2pa.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/verify-content-credentials/SKILL.md · 60 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

4 files 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. 2mo ago First seen · 60 lines · 57 tokens per session scan A 944a7a9fa09f

Subscribe to this mod's changes

verify-content-credentials is a skill published in the GitHub repository Neeeophytee/ai-watermarks-reality-check (16 stars, last pushed 2mo ago), licensed AGPL-3.0. It adds 57 tokens to every session and 617 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

Legal and complianceagent-skillsc2paclaudecodexcontent-credentialsgemini
Related

verify-content-credentials compared with skills from other repositories

verify-content-credentials next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
verify-content-credentialsNeeeophytee/ai-watermarks-reality-checkSkill162mo agoAGPL-3.0A57Codex
bionic-safety-netwinstonkoh87/Athena-PublicSkill620yesterdayMITA34Claude Code, Codex
tax-lensyennanliu/InvestSkillSkill27513d agoMITA91Claude Code
compliance-checkjosstei/maestro-orchestrateSkill4864d agoApache-2.0A25Claude Code, Codex
tw-formal-writingImbad0202/tw-formal-writingSkill1971mo agoMITA538Claude Code
insurance-expertpersonamanagmentlayer/pclSkill4411d agoApache-2.0A65Claude Code
standards-expertpersonamanagmentlayer/pclSkill4411d agoApache-2.0A50Claude Code