Inspect a local STEP artifact by filesystem path or file: URI. Returns its content revision with dimensions, counts, and B-rep validity. Call this first; use the returned artifact reference for entity searches and measurements. Lengths are in the declared unit, which is labelled on every result. Bounding boxes are conservative envelopes, and volume is null when the file has no solid material. Use include to request only size, counts, and/or health sections.

Find faces, edges, vertices, or solid bodies in the revision-bound artifact returned by inspect, optionally scoped to an assembly component_name. Use this before measure, because every measurement names entity IDs rather than coordinates, and follow pagination until has_more is false whenever a count or a minimum matters. Faces support surface_type, area, and radius filters (e.g. { surface_type: "cylinder", min_radius: 2 }); edges support curve_type, length, and radius; vertices return coordinates and bodies return volume. IDs are producer- and revision-scoped: they are valid only for this server and only for the artifact revision that returned them, so never reuse them after the file changes or in another tool. Occurrence IDs distinguish repeated component instances. distance takes sources/targets; every other measure kind takes entity_ids, and cad://help lists the required fields for each kind.

Measure distance, wall thickness, draft, rays/ray grids, point geometry, planar sections, or edge continuity. Use the artifact reference and entity IDs from the same find_entities result. Lengths are in the declared unit, which is labelled on every result. Ray grids report their grid size and can be refined with max_rays up to 20000. Fetch the cad://help resource for the required fields of each kind. Returns geometric measurements only, not engineering acceptance or design recommendations.

Report the dimensions, geometric tolerances, and datums that a STEP artifact declares, as data: nominal, deviations, and tolerance form for each dimension; value, zone shape, material requirement, and datum references for each geometric tolerance; and the entity IDs each annotation applies to. characteristics checks each dimensional callout against the faces it controls, and reports satisfied or violated where that is arithmetic — a diameter read from the cylindrical faces the callout names — and unresolved with a reason everywhere else, so a callout that was not checked cannot be mistaken for one that was. Check value_resolved before comparing anything yourself. It is false when the magnitude could not be read and is reported as 0.0, which is what a genuine zero callout also reports; a location dimension defining a tolerance frame has no value of its own. A basic dimension comes back not-applicable: it defines a tolerance frame and states no limit of its own. An angle or a location callout comes back unresolved with needs-frame, because the angle between two faces and a location dimension direction both depend on the frame the callout is stated in. A datum reference carries the entity IDs of the shapes its datum is attached to. Without them a tolerance naming that datum cannot be evaluated, so report the datum as unlocated rather than treating the tolerance as met. unlocated_datums names those references for you; a tolerance that carries it is not checkable, and saying which datum is missing is the useful answer.Counts report both datum references and distinct datums, because a frame names its references one by one and the same datum appears once per frame. Values are in the declared unit, the same unit this server uses for measurements. Read pmi_kind before describing what a file does or does not declare: semantic means the callouts are readable data; graphical-only means the file does show requirements, drawn rather than encoded, so say they must come from the drawing or the engineer instead of saying the model declares none; none means it declares nothing at all. Use the artifact reference from inspect; entity IDs are valid only for that revision.

Compare baseline and candidate STEP artifacts, as filesystem paths or file: URIs. Returns both content revisions, geometry deltas in the baseline declared unit, declared PMI counts (dimensions, geometric tolerances, datums, and how many tolerance values could not be read), and parsed document facts: schema, product names/count, assembly flag, authoring system, and organization. The PMI counts show whether a revision added or dropped callouts; they compare how many callouts exist, not whether any is met. These are file-level facts; they do not explain design intent.