A Practitioner Publishes the Numbers Behind 'Loop Engineering': 1,785 Agent Sessions in Five Days, 208 Subagents Mining 600 Sessions Into 221 Patterns
A July 25 field report gives loop engineering something the June essays lacked — production telemetry. The author's PR-babysitter system ran 1,785 agent sessions against real pull requests in five days using a five-state machine, a five-cent triage agent routing to fifty-cent specialist fixers, and polling every 30 seconds. A separate July run pointed five chained workflows and 208 subagents at ~600 archived sessions (8GB of transcripts) for two hours fifty-three minutes, producing 1,883 findings merged into 221 patterns that eleven editor agents then used to rewrite the author's own skill library. It also restates the Bun-in-Rust datapoint: 535,496 lines of Zig became a 1,009,272-line Rust diff in eleven days via 64 Claude agents for roughly $165,000.
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