Red Skill for Claude

confide:red — residual re-identification risk check

A defensive audit of YOUR OWN already-redacted output. It does not score against

ground truth and is not a benchmark. It surfaces, qualitatively, what an attacker could

still do — mapped to GDPR Art-29: singling-out, linkability, inference.

GUARDRAILS — read before running

• Run only on the user's own redacted output. If asked to de-anonymize or re-identify

third-party / non-consented data, refuse.

• Report risk categories and counts only — never produce a step-by-step

re-identification recipe or guess the hidden values.

• Local attacker by default. Enable the cloud/LLM inference probe (--inference)

only on synthetic or explicitly consented data.

• Absence of a finding ≠ safety. A weak local detector/attacker is a FLOOR, not a

ceiling. Always tell the user human review is still required.

• This pairs with confide:anon — run red *after* redacting, on the redacted file.

What it checks

• Singling-out (deterministic, offline — the load-bearing signal): re-run

detect_regex (+ detect_natasha if available) on the redacted text. Anything

they still find is a surviving identifier the redaction missed. Counts by type.

• Linkability (multi-file): given a folder, compare every file pair for shared

surviving quasi-identifiers and flag potentially linkable pairs (count + types only).

• Inference (LLM, optional, opt-in): prompt the local attacker model

(cfg.red_attacker_model) for the attribute categories it could still infer

(profession, location type, age band, …). Degrades gracefully if no model. WARN the

user it under-reports (floor, not ceiling).

Risk tier rule

• HIGH — any DIRECT identifier survives (EMAIL, PHONE, URL, ID, PERSON).
• MEDIUM — only QUASI identifiers survive (LOCATION, ORG, DATE, AGE, PROFESSION,

MEDICATION), or linkable pairs exist across files.

• LOW — no surviving identifiers found (still NOT a guarantee).

How to run

# single redacted file (offline, deterministic)
python3 skills/red/scripts/red.py path/to/file.green.md

# a folder of redacted files (adds linkability)
python3 skills/red/scripts/red.py path/to/redacted_dir/

# add the local inference probe — synthetic/consented data ONLY
python3 skills/red/scripts/red.py path/to/file.green.md --inference

# machine-readable
python3 skills/red/scripts/red.py path/to/file.green.md --json

Output

A residual-risk report: per-file surviving-identifier counts by type, an overall

risk tier, the inference categories claimed (if probed), the **linkable-pair

count**, and the caveat that *absence of a finding ≠ safety; human review still required*.

No PII values, no re-identification steps.