Inspect Content Provenance

Inspect Content Provenance

Inventory evidence without making an authorship verdict. Treat located markers as clues and keep Anthropic text watermark status UNVERIFIABLE until Anthropic publishes a supported detector.

All paths below are relative to this skill's directory. If you are running from elsewhere, use an absolute path to scripts/inspect_file.py.

Workflow

1. Preserve the source; never rewrite it.

2. For a file, run:

   python3 scripts/inspect_file.py /absolute/path/to/asset
   

   For literal text, run:

   python3 scripts/inspect_file.py --text 'text to inspect'
   

   Literal input has no filename or host-language context, so this route checks the A.8 unstructured-text wrapper only. Use a file path when checking an A.9 comment or front-matter carrier.

3. Read manifest_presence as an inventory result:

   • POSSIBLE: a structural carrier, sidecar, or format-appropriate malformed hint was located; inspect marker confidence and verify before relying on it.
   • ABSENT: the bounded local scan found no structure; this does not prove human authorship.
   • UNKNOWN: the input could not be meaningfully inspected, or the container is unsupported.

4. Check c2pa_markers[].confidence:

   • STRUCTURAL: found where a manifest belongs (PNG caBX, JPEG APP11 JUMBF, BMFF uuid, WebP C2PA).
   • MODERATE: a format-appropriate key or namespace reference.
   • SIDECAR: a detached .c2pa manifest beside the asset.

5. c2pa_mentions is separate and is never evidence. A document that discusses Content Credentials is not a signed asset and must not be routed to the verifier.

6. If any marker is present, use verify-content-credentials.

7. Report the SHA-256 hash so later derivatives can be compared.

Non-negotiable language

• Say “possible C2PA marker,” never “valid credential,” unless a conforming verifier validates it.
• Say “Anthropic text watermark detection is unavailable,” never “no watermark found.”
• Invisible Unicode characters are a text-integrity signal, not an Anthropic watermark detector. Use detect-text-watermark to analyse them.
• Absence of metadata is not evidence of human creation.

Read references/evidence-model.md when explaining ambiguous or unknown states.