get_mesh_is_closed

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety behavior is covered. The description adds the underlying engine function name but discloses nothing about failure modes (invalid path, out-of-range lod_index) or cost. Modest added value on top of a well-annotated tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

One tight sentence plus an explicit Returns line, with the core semantics front-loaded. Slightly dense wording ('via UGeometryScriptLibrary_MeshQueryFunctions::GetIsClosedMesh') but the function reference is informative rather than filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description usefully enumerates the return fields (static_mesh_path, lod_index, is_closed) and annotations cover the safety profile, so an agent has what it needs to call and interpret the tool. Only the asset-type prerequisite and invalid-input behavior are missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% with only two parameters, and both are documented in the schema ('optional LOD index, default 0' and 'content path to the UStaticMesh asset'). The description adds no parameter syntax or format beyond that, so baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Names a specific verb ('Test whether') and resource (static mesh topological boundary edges / closed manifold), and even cites the underlying UGeometryScriptLibrary function. The check it performs is unambiguous, but it never distinguishes itself from near neighbors in the mesh-query family such as get_mesh_open_border_loops or get_num_open_border_edges, which is the main clarity gap.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use or when-not-to-use guidance, no prerequisite stated (e.g. that the target must be a UStaticMesh content path rather than an editable/dynamic mesh), and no alternative tool named for related boundary/closure queries. The agent must infer applicability from the one-line semantics alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.