List Hygiene Judge

Use this skill after collecting current contact evidence and before preparing a campaign. It decides whether a contact remains eligible, needs re-permission, must be suppressed, or needs human review. When policy justifies a state transition, it records that decision in the operator's consent ledger with optimistic concurrency and verifies the exact event through a second read.

This skill never sends a message and never mutates a mailing provider. A later send-as run must read the current consent state again at delivery time. The ledger records the operator's policy decision; it does not replace provider unsubscribe or bounce data.

Operating model

The caller supplies one bounded engagement observation, the current consent observation, and the policy threshold that applies to the contact. The evidence must be marked read and versioned to the same ledger head that the runner reads through data.read_projection. Missing, stale, ambiguous, or conflicting evidence produces human_review without a write.

The deterministic decision order is conservative:

1. An unsubscribe marker stops automation.
2. An existing suppression is preserved; age alone can never relax it.
3. Verified hard-bounce evidence suppresses when policy permits that automatic action, otherwise it stops for review.
4. A subscribed contact whose last engagement exceeds the decay threshold is moved to re_permission.
5. A clean, recent subscribed contact returns verify without writing.

Only re_permission and suppress can create transitions. The append uses the observed ledger version and the caller's stable idempotency key. Readback must match the append status, source identity, new version, event reference, event digest, and projection digest before the result reports a recorded transition. No-write decisions also perform a second read and require the projection to remain unchanged.

Authority and finality

The runner requests runx:data:read and, only for an admitted transition, runx:data:append. These scopes authorize a bounded consent-ledger operation; they do not authorize delivery or changes to a CRM or mailing provider. The data-source binding owns storage and credentials.

A sealed result proves the ledger reads and any exact recorded transition. It does not prove provider state, re-subscription, campaign approval, or delivery. Every result therefore keeps downstream_send.status at not_run and names send-as as the separate delivery boundary.

Decisions and recovery

• verify: current evidence supports no transition. Nothing is appended.
• re_permission: engagement has decayed past policy and a subscribed contact must regain permission before sending. The transition is recorded once.
• suppress: hard-bounce evidence requires suppression, or an existing suppression is preserved. A write occurs only when state actually changes.
• human_review: evidence or policy cannot safely support automation. Nothing is appended.

If the ledger version changes before the decision, run again with a fresh read and fresh evidence. Reuse an idempotency key only for the identical transition. The runner deliberately makes no claim that a post-commit retry can recover from the old expected version; inspect the receipt and current ledger before deciding whether another operation is needed.

Inputs and result

Provide the logical data source, consent-ledger resource, contact aggregate, observed version, stable transition key, bounded engagement counts and recency, bounce policy, and current consent evidence. Counts must be non-negative and the policy threshold must be between 1 and 3,650 days.

The result preserves the decision and reason, the observed consent state, the readback-bound transition identity when one was written, a human escalation only when review is required, and the untouched downstream send boundary.

Agent rules

• Never invent engagement, bounce, consent, or version evidence.
• Never relax suppression from contact age alone.
• Never re-permission an unsubscribed contact automatically.
• Never describe an internal ledger append as a provider update.
• Never dispatch, send, or claim delivery from this result.