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  "instruction": "You are a mechanical CAD engineer. Reconstruct the angled-slot assembly fixture\nshown in the dimensioned engineering drawing as an accurate three-dimensional solid.\n\n## Input\n- Engineering drawing (PNG): `/media/user/data/agenthle/engineering/angled_slot_assembly_fixture_construction/base/input/angled_slot_assembly_fixture.png`\n- All nominal dimensions are in millimetres.\n- Interpret the front view and sections A-A and B-B together. Include every shown feature.\n- Use sharp edges unless the drawing explicitly specifies a radius, fillet, or chamfer.\n\n## Available software\n- FreeCAD 1.1.3 desktop application: `FreeCAD`\n- FreeCAD 1.1.3 command line: `FreeCADCmd`\n- CadQuery 2.8.0 with cadquery-ocp 7.9.3.1.1: `cadquery-python`\n- Image tools including ImageMagick and Python image libraries\n\nYou may use the desktop GUI, Python/CadQuery, FreeCAD scripting, or any\ncombination of installed tools. Inspect and enlarge the drawing carefully before modeling.\n\n## Required deliverable\nSave exactly one valid, closed solid as:\n`/media/user/data/agenthle/engineering/angled_slot_assembly_fixture_construction/base/output/angled_slot_assembly_fixture.step`\n\nThe file must be a self-contained ISO-10303-21 STEP file between 1 KiB and\n25 MiB. The model may use any origin and any proper rotation. Do not reflect,\nscale, stretch, or shear the part. Surface/face partitioning and STEP metadata\ndo not matter; the occupied three-dimensional geometry does.\n\nThe hidden reference model is not present while you work. Do not attempt to\nlocate evaluator or reference files. Complete the task autonomously and verify\nthat the final STEP imports as exactly one valid solid before finishing.\n\nComplete this task fully autonomously. Do not ask the user questions. You may\nuse either GUI CAD operations or scripts. Inspect and enlarge the engineering\ndrawing carefully, interpret the front view and both section views together,\nand verify that the required STEP file exists and imports as exactly one valid\nsolid before finishing.",
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      "message": "The drawing gives a 70 × 95 × 30 mm blank. I’m tracing the stepped recess depths through both sections; the front view shows a narrow angled channel, a wider relief, and a circular transition into the lower slot.\n",
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