evidence-verifier

id	evidence-verifier
name	evidence-verifier
type	Capability Uplift
version	1.0.0
created	20/03/2026
modified	20/03/2026
status	active
triggers	["verify the proof","check the evidence","is there proof","show me the artifacts","validate the evidence","confirm the proof","check artifacts"]
description	>
context	fork

Evidence Verifier Skill

Purpose: Ensure that claimed proof artifacts are real, accessible, and relevant. Phantom evidence is evidence that is claimed but does not exist.

When to Use

Use this skill when:

• A sub-agent or specialist claims to have proof of completion
• A proof artifact is referenced by path or URL but not shown
• A completion claim is made without supporting evidence
• You need to audit a list of claimed artifacts before accepting a milestone

Evidence Classification

Class	Definition	Accepted?
VERIFIED	Artifact shown, accessible, relevant, and recent	Yes
CLAIMED	Artifact referenced but not shown	No
PHANTOM	Artifact claimed to exist but cannot be found	No
STALE	Artifact exists but is from an outdated state	No (without note)

Procedure

Step 1: Enumerate claimed artifacts

List every artifact that has been claimed as proof:

• File paths (e.g., reports/gap-analysis.md)
• URLs (e.g., https://production-url.com)
• Test output (e.g., "all 47 tests passing")
• Screenshots (e.g., "screenshot of dashboard")

Step 2: Verify each artifact

For each claimed artifact:

If it's a file path:

• Check the file exists using the Read tool or ls
• Check it contains relevant content (not empty, not placeholder)
• Check it was modified recently (matches claimed work)

If it's a URL:

• Fetch the URL and verify the response code
• Verify the content matches the claim

If it's tool output (test results, curl, etc.):

• The output must be shown verbatim in the evidence
• Claimed results without shown output = CLAIMED (not VERIFIED)

If it's a screenshot:

• The screenshot must be viewable and show the claimed state
• A description of a screenshot is not a screenshot

Step 3: Classify and report