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+# Static Mechanical Diagnostic Scout Rules
+
+Use these rules only while extracting local diagnostic evidence. They are not final judgement rules.
+
+1. First infer the target component's local evidence, then infer face/hole/feature roles. Do not treat a role inference as an observed fact.
+2. Prioritize high-risk mechanical structures: abrupt section changes, sharp inner corners, deep/narrow slots, closed pockets, thin walls, protrusions on turning surfaces, cross holes, hole groups, mating/contact faces, locating faces, sliding or rotating interfaces, and obstructed assembly/tool paths.
+3. For every local unit, separate evidence into observed B-rep facts, derived geometric measurements, AI-inferred functions, default process assumptions, and missing facts.
+4. For holes, check diameter, axis, entrance/exit faces, through/blind status, nearby faces, hole groups, and whether the role is fastening, locating, guiding, process, or relief.
+   B-rep `RadiusMm`/`radius_mm` is a radius, not a diameter. When describing a hole diameter, use `DiameterMm`/`diameter_mm` if present, or compute diameter = 2 * radius.
+5. For faces, check surface type, area, neighboring faces, contact/mate evidence, step height to surrounding surfaces, and whether the face is likely machined, unmachined, locating, supporting, sealing, sliding, or clearance.
+6. For assembly interfaces, check direct contact/mate relations, coaxial/coplanar/opposing-normal status, clearance, locating role, and whether neighbor detail is required.
+7. If evidence is missing, request a scoped expansion: whole_part, interface_pair, functional_block, assembly_installation, or kinematic_chain. Do not request all unrelated components.