services-audit-cron

name	services-audit-cron
description	Use when scheduling the canonical biweekly services-audit cron loop for Empirica's AI service scanner (Phase 3). The auditor body is `empirica services-audit` — captures a fresh scan, diffs against the previous, and emits a notification when novel running services appear. This skill provides the prompt template that wires the body into Claude Code's `/loop` cron mode + Empirica's loop registry. Recommended cadence: `0 6 1,15 * *` (1st and 15th of each month at 06:00 UTC — biweekly).
version	1.0.0

Services-audit cron loop wiring

The Phase 3 services-audit loop runs empirica services-audit on a biweekly cadence, captures novelty between runs, and notifies the operator when something new is running.

This skill is a thin wrapper over /loop-cron — same self-scheduling template, with services-audit plugged in as the body.

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When to Use

Register the canonical biweekly services-audit cron when:

• You've just shipped Phase 1 + Phase 2 of the scanner (one-shot scan + auditor skill) and want the audit to run unattended on a schedule
• You want novelty notifications (new processes, new listening ports, new MCP servers) without remembering to scan manually
• You want a durable audit trail in ~/.empirica/scan_history_<project_id>.jsonl

If you only want a one-shot audit, run empirica services-audit directly — no loop needed.

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Cron Prompt Template

When invoking /loop in cron mode, prepend these CLI lines to your task prompt. The body itself is one command — the rest is registry wiring.

At start (idempotent — safe to call every fire):
  empirica loop register --name services-audit --kind cron \
    --cron "0 6 1,15 * *" \
    --description "Biweekly AI services audit (scan + diff + notify on novelty)" \
    --backoff none

Check pause — exit silently AND don't schedule next fire if paused:
  PAUSED=$(empirica loop status services-audit --output json | jq -r .paused)
  if [ "$PAUSED" = "true" ]; then
    empirica loop heartbeat services-audit --status ok --result paused \
      --message "skipped, paused"
    exit 0   # CRITICAL: exit without scheduling next; loop is genuinely off
  fi

Run the audit body — single command, returns structured JSON.
The .result field is shaped to feed straight into heartbeat:
  AUDIT=$(empirica services-audit --output json)
  RESULT=$(echo "$AUDIT" | jq -r .result)              # found | empty | fail
  SCAN_ID=$(echo "$AUDIT" | jq -r .scan_id)
  PROC_NEW=$(echo "$AUDIT" | jq -r '.novelty.processes_added | length')
  PORT_NEW=$(echo "$AUDIT" | jq -r '.novelty.listeners_added | length')
  SUMMARY="scan ${SCAN_ID:0:8} → $RESULT (+$PROC_NEW procs, +$PORT_NEW listeners)"

  empirica loop heartbeat services-audit --status ok --result $RESULT \
    --message "$SUMMARY"

Schedule + install the next fire:
  NEXT_CRON=$(empirica loop schedule-next services-audit --output json | jq -r .cron_one_shot)
  # CronCreate(cron=$NEXT_CRON, recurring=false, prompt='<this whole template again>')

  # Heartbeat back the scheduler-returned job_id so pause can cancel:
  empirica loop heartbeat services-audit --status ok --result $RESULT \
    --next-scheduled-job-id "$JOB_ID" --scheduler-kind cron-create

On failure (collect_snapshot threw, scan dir unwritable, etc.):
  empirica loop heartbeat services-audit --status fail --result fail \
    --message "{error message}"

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Cadence

The default cron 0 6 1,15 * * fires at 06:00 UTC on the 1st and 15th of each month — closest stable approximation of "biweekly" that cron expression syntax allows. Adjust the hour/day for your timezone or operational rhythm.

For more frequent monitoring (e.g. weekly): 0 6 * * 1 (every Monday).

For less frequent (monthly): 0 6 1 * * (1st of each month).

services-audit is cheap on a typical dev machine (~1-2 seconds for the snapshot + diff), so cadence is purely a noise-budget question, not a resource one.

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Reading the result

empirica services-audit --output json returns:

{
  "ok": true,
  "project_id": "...",
  "scan_id": "...",
  "prior_scan_id": "...",      // null on first run
  "result": "empty",            // "found" / "empty" / "fail"
  "novelty": {
    "processes_added": [],      // names appearing for the first time
    "processes_removed": [],    // names that were there last time
    "listeners_added": [],      // host:port pairs
    "listeners_removed": []
  },
  "saved": {...},
   
     
           
  

Result mapping for loop heartbeat --result:

• found — novel processes or listeners detected. Notification fired via the configured backend (stdout / log / ntfy). Backoff resets to base.
• empty — no novelty since the previous scan. Quiet success. Backoff advances streak (if --backoff exponential is set; the default template uses none since biweekly is already a slow cadence).
• fail — services-audit errored (no project context, scan crashed). Backoff resets to base; retry next interval.

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Operator workflow

After installing the loop:

1. Review history: empirica scan-history --limit 10 — last 10 audit fires
2. Compare two snapshots: empirica scan-diff <a> <b> — spot-check what changed between two cycles
3. Re-render a snapshot: empirica scan-show <scan_id> — full markdown report
4. Pause if noisy: empirica loop pause services-audit — body exits cleanly on next fire, no next-cron installed
5. Resume: empirica loop resume services-audit then empirica loop fire services-audit to bootstrap (CronCreate-mode only emits a hint).

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Notification routing

The services-audit notification has:

• severity: warning
• source: loop:services-audit
• tags: [services-audit, security]

To route audit notifications to a specific backend (e.g. ntfy on a dedicated topic), add a routing rule to ~/.empirica/notify.yaml:

routing:
  - match: { source: "loop:services-audit" }
    backend: ntfy
    topic: empirica-security

Without a routing rule, the dispatcher's default backend handles them (stdout, by default — visible in your tmux scrollback or the cockpit's notification panel).

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See also

• /loop-cron — the generic cron template this skill specialises
• /services-auditor — the AI-judgment skill (Phase 2) that runs alongside the deterministic scanner; complementary not redundant
• docs/architecture/SERVICES_SCANNER.md — Phase 1/2/3 architecture
• docs/architecture/PROPOSAL_LOOP_BACKOFF.md — backoff math (services- audit doesn't use it — biweekly is already slow — but the option is there if you switch to a tighter cadence)