Adversarial Verify

Path Resolution

• <skill-root> means the directory containing this SKILL.md.
• Resolve scripts/... and references/... relative to <skill-root>, not the caller's current working directory.
• When executing local helpers, use explicit paths such as <skill-root>/scripts/....

Constraints

• Do NOT modify implementation code. Write only the adversarial report and attack test files. Reason: modifying code during adversarial verification would invalidate evidence and conflate "finding vulnerabilities" with "fixing them."
• Attack test files must be clearly separated from production tests (use a dedicated directory or naming convention such as *_adversarial_test.*).

Precondition Check

Before starting adversarial verification, confirm preconditions:

1. Verify all target files exist in the repository. If any target file is missing, stop as BLOCKED.
2. Verify <skill-root>/references/attack-vectors.md exists. If missing, stop as BLOCKED.

Tier-Based Invocation Policy

Implementation file definition: Standard (impl) applies when at least one target file is implementation code rather than docs/tests-only scaffolding.

Input

• Target files (required): Repository-relative paths of files to verify.
• Change description (required): Description of what changed, its impact scope, and the rationale behind the change.
• Risk tier (optional): Critical / Sensitive / Standard. Defaults to Sensitive when omitted.

Procedure

1. Generate Header: Write verification metadata directly:
   • Mode: adversarial-verify
   • Target Files: list of target files
   • Risk Tier: Critical / Sensitive / Standard
   • Verified At: UTC timestamp (obtain via date -u +"%Y-%m-%dT%H:%M:%SZ")
2. Load Context: Read all user-provided target files and <skill-root>/references/attack-vectors.md (including the optional ## Maintainer-Curated Extension Vectors section when present).
3. Select Attack Categories: Based on the change description and the content of target files, select applicable attack categories from the reference. Do NOT blindly apply all categories — choose only those relevant to the actual change. If ## Maintainer-Curated Extension Vectors contains vectors matching the change characteristics, include them as additional probe targets regardless of the selected categories.
4. Execute Attacks: For each selected attack vector:
   • Design a concrete test or probe targeting the implementation.
   • Create the test file (naming: *_adversarial_test.* or in a dedicated adversarial/ directory).
   • Execute the test/probe.
   • Record: attack vector, test file, command executed, exit code, result (DEFENDED / VULNERABLE), evidence.
   • Enforce tier minimums:
     • Critical: execute at least 3 probes.
     • Sensitive: execute at least 2 probes including Category 1 (Input Boundary) and the most relevant additional category.
     • Standard (impl): execute at least 1 probe using the most relevant category.
     • Standard (non-impl): no minimum probe count.
   • [required] vector coverage — this step defines coverage obligations; attack-vectors.md provides the tags. [required] marks minimum-coverage vectors; non-required vectors remain applicable and should be probed when relevant — the tag does not grant skip permission.
     • Critical / Sensitive: cover all [required] vectors within selected categories. For each: (a) execute a probe, or (b) document why it is non-applicable. Uncovered [required] vectors without documented rationale → Overall Verdict: FAIL.
     • Standard (impl): cover the single most relevant [required] vector in the selected category.
     • Standard (non-impl): no [required] coverage obligation.
5. Coverage Gate: Verify [required] vector coverage procedurally:
   • Identify all [required] vectors within selected categories from attack-vectors.md.
   • Cross-reference each against the Attack Summary table entries.
   • Standard: no [required] coverage obligation — proceed.
   • Sensitive / Critical: if any [required] vector is uncovered without documented N/A rationale → Overall Verdict: FAIL.
6. Compute Verdict: Overall Verdict: PASS only when ALL attack probes result in DEFENDED and the Coverage Gate is PASS. Any VULNERABLE or coverage FAIL → Overall Verdict: FAIL.
7. Write Report: Output to adversarial-report.md.
8. Write file paths in repository-relative form. If you mention a skill helper command, render it as scripts/<name>.sh, never an absolute filesystem path.

Edge Cases

• Zero applicable attack categories: If the Selection Guidance table yields no relevant categories for the change area, apply tier-based fallbacks:
  • Critical / Sensitive: categories 1 (Input Boundary) and 2 (Error Handling) as baseline.
  • Standard (impl): category 1 (Input Boundary) only (1 probe minimum).
  • Standard (non-impl): user judgment (optional invocation). Record the rationale for limited applicability in the report.
• Missing test infrastructure: If the project lacks a test framework or runtime needed to execute attack probes, stop as BLOCKED and request the user to set up the necessary infrastructure. Do not skip attacks because tooling is absent.
• Attack probe budget:
  • Critical: minimum 3 probes, target 3-8, cap at 15.
  • Sensitive: minimum 2 probes, target 2-4, cap at 8.
  • Standard (impl): minimum 1 probe, target 1-2, cap at 4.
  • Standard (non-impl): choose probe count by scope and document rationale.

On FAIL

• Report specific vulnerabilities with reproduction steps.
• The user is responsible for fixing identified vulnerabilities and re-running adversarial verification.
• If the run reveals a reusable attack vector, record it in the adversarial report and propose a separate skill-maintenance task. Do NOT edit <skill-root>/references/attack-vectors.md during adversarial verification.

Output Format

# Adversarial Verification Report

## Verification Metadata

- **Mode**: adversarial-verify
- **Target Files**: [list]
- **Risk Tier**: [tier]
- **Verified At**: [UTC timestamp]
- **Overall Verdict**: PASS | FAIL

## Attack Summary

| # | Category | Attack Vector | Required? | Test File | Command | Exit Code | Result | Evidence |
|---|----------|--------------|-----------|-----------|---------|-----------|--------|----------|
| 1 | [category] | [vector] | yes/no | [file] | `[command]` | [code] | DEFENDED/VULNERABLE | [brief evidence] |

## Vulnerabilities Found

<!-- Only present when Overall Verdict is FAIL -->

| # | Attack Vector | Severity | Reproduction | Suggested Fix |
|---|--------------|----------|--------------|---------------|
| 1 | [vector] | [critical/high/medium] | [steps] | [suggestion] |

## Decision

- Adversarial verification: PASS/FAIL
- Reason: [rationale]