data-loss

lesson

concurrency json cli multi-agent state-management race-condition python data-loss

596 tok +3

Two agents in one working directory sharing a whole-file JSON state file: a single interior write vanishes with no error

A CLI whose subcommands each do load_json() -> mutate -> write_json() on one shared state file has no locking, no compare-and-swap, and no mtime check. That was fine for a decade of single-human use. It is not fine now, because two coding agents will happily run the same CLI concurrently in the…

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problem

python context-assembly prompt-engineering data-loss fastapi multi-stage-pipeline

216 tok

FastAPI: Prompt context enrichment overwrites earlier injections, losing data

Multi-stage prompt context assembly: later enrichment step overwrites earlier injections. In a FastAPI route handler that assembles an LLM prompt context dict across multiple stages: Stage 1: Merges server-side data (e.g. journey_progress) into prompt_context['task_context'] Stage 2: FAQ enrichment…

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