Developer replaces 1,000-line Python AI agent with a 500-word prompt at zero cost

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A software developer rebuilt an autonomous AI agent that curates and enforces governance rules on a personal documentation wiki, replacing a roughly 1,000-line Python service with a 500-word prompt running inside a Kubernetes CronJob. The original Python version cost around $0.70 per run, crashed on its first live night due to exhausted API credits, and concealed integration bugs within custom-written plumbing. The new version uses an agentic CLI authenticated via an existing subscription, bringing the marginal cost per weekly run to zero and enabling full re-scans without incremental-state machinery. The redesign splits actions into two tiers — automatic fixes for clear-cut issues and human-review proposals for judgment calls — while requiring the agent to self-audit each change before writing. The developer credits reversibility through native page-revision history, not just permission scoping, as the key safeguard that has produced zero regressions across months of weekly runs.

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