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Reliability · Version 1.4.0 · Reviewed 2026-08-02

Scheduled Task Correctness Reviewer

Reduce production risk in overlap prevention and timezone handling with evidence, explicit trade-offs, and a verification plan.

4 method steps 4 documented failure modes 4 diagnostic checks 7 quality gates

Reviews cron and scheduled work for overlap, timezone drift, missed runs, and duplicate execution.

₹99 one-time

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What this skill helps you do

  • Overlap prevention
  • Timezone handling
  • Missed run recovery

How Scheduled Task Correctness Reviewer works

You provide

Impact window, telemetry, and dependency state

It inspects

Saturation and blast radius behind overlap prevention

It decides

A timezone handling plan that stabilizes before diagnosing

You verify

Detect, mitigate, and resolve times recorded separately

What it checks first

Scheduled Task Correctness Reviewer reviews cron and scheduled work for overlap, timezone drift, missed runs, and duplicate execution. Use it when the work involves Overlap prevention, Timezone handling, Missed run recovery.

  1. User-visible impact and error-budget consumption rather than component health.
  2. Saturation signals — queue depth, pool utilization, connection counts — near the onset.
  3. Whether the system recovered on its own, which indicates saturation rather than corruption.
  4. The blast radius and what boundary should have contained it.

Failure modes it recognizes

  • Retry amplification turning a partial failure into a total outage.
  • A shared dependency creating correlated failure across supposedly independent services.
  • Slow resource exhaustion invisible until a hard limit is crossed.
  • A rollback blocked by an incompatible migration.

Answers it will reject

  • Treating the trigger as the root cause, which stops the analysis before the fragility is identified.
  • Adding a runbook step where a boundary would remove the failure mode.
  • Measuring availability as a mean, which hides regional and tenant-level outages.

Decision rules it applies

  • Stabilize user impact before completing diagnosis.
  • Bound every retry with a budget, jitter, and a circuit breaker.
  • Prefer removing a failure mode over detecting it faster.

Evidence it asks for

  • Record time-to-detect, time-to-mitigate, and time-to-resolve separately.
  • Quantify impact in customer terms: failed requests, affected accounts, duration.
  • Verify recovery with the same signal that detected the failure.

The method inside

  1. Map the artifact, actors, boundaries, and invariants relevant to overlap prevention.
  2. Trace concrete failure or abuse paths for timezone handling; do not report checklist items without a mechanism.
  3. Prioritize missed run recovery findings by impact, likelihood, confidence, and cost of correction.
  4. Recommend the smallest defensible change, then define how an independent reviewer can verify it.

Deliverables

  • Overlap prevention assessment
  • Timezone handling decision and action plan
  • Missed run recovery verification checklist

Evidence requirements

  • User-visible symptoms and SLO impact
  • Timeline, telemetry, deploys, and dependency state
  • Current mitigations and operational constraints

Quality gates

  • Every material claim traces to supplied evidence or is labeled as a hypothesis.
  • The response follows the declared deliverable contract.
  • No execution, access, measurement, or verification is invented.
  • Secrets and personal data are redacted rather than repeated.
  • The user receives a concrete independent verification step.
  • The relevant failure modes in this domain were considered rather than only the reported symptom.
  • No listed anti-pattern was recommended as a solution.

Example task

Input

Our nightly job occasionally runs twice and once skipped a day entirely during a daylight saving change.

Expected output

Both are classic scheduling defects. Duplicate runs mean no distributed lock across instances, and the skipped day is a local-time schedule crossing a DST boundary. Schedule in UTC and make the job idempotent so a double run is harmless...

Boundaries and compatibility

Ideal for

  • Overlap prevention: produce a decision or artifact grounded in supplied evidence.
  • Timezone handling: produce a decision or artifact grounded in supplied evidence.
  • Missed run recovery: produce a decision or artifact grounded in supplied evidence.

Out of scope

  • Replacing incident command authority
  • Calling a trigger the root cause without a causal chain

Agent compatibility

  • GitHub Copilot custom agents
  • Claude Agent Skills / SKILL.md
  • Any instruction-following chat model

Tool policy: Advisory by default. No tools are assumed. If the host provides tools, use read-only evidence gathering unless the user explicitly approves a scoped write or execution action.