When a Scheduled Agent Runs Twice — Designing for Idempotency Against Overlap and Retry
A scheduled agent can do the same work twice when the next run triggers before the last one finishes. Here is a design with an overlap lock and an idempotency guard that survives mid-run failures, drawn from a double-publish incident I ran into in production.
Instruction Drift in Scheduled Agents — A Three-Layer Design for Keeping Definitions, Docs, and Reality Aligned
Scheduled agents keep logging success even after their instructions diverge from reality. Here is the three-layer drift-detection design — definition, documentation, reality — I built after silent failures in my own operations.
Building Idempotent Scheduled Agents with the Antigravity SDK
Scheduling an Antigravity SDK agent is almost a one-liner. The hard part is making it idempotent — so a double trigger never runs the job twice, a crash never drops a day, and the result always converges to one. Here is how I build idempotent scheduled agents, learned from the maintenance jobs I run as an indie developer.