setup_navmesh

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

With no annotations provided, the description carries the full burden, and it does well by disclosing key side effects: existing volumes are resized/repositioned instead of duplicated, and the nav system is optionally rebuilt. It also reveals the return values with action types. It stops short of a 5 because it does not mention potential costs of rebuilding, permission requirements, or behavior when multiple NavMeshBoundsVolumes exist.

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?

The description is well-structured and front-loaded: the core action and idempotency are stated first, followed by compact Args, Returns, KB reference, and example. Every section earns its place, and there is no redundant 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?

For a simple three-parameter tool with no annotations, the description is highly complete: it explains behavior, parameters, defaults, return format, and gives an example. It loses one point because it does not address how it relates to closely related sibling tools or warn about any prerequisites for operating on the current editor level.

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?

Despite the input schema having 0% description coverage, the Args section fully documents every parameter: extent as half-extents in cm with a default and area formula, location as center in cm with a default, and rebuild as a boolean controlling nav-system rebuild. This is exactly the semantic context the schema lacks.

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?

The description clearly states the verb and resource: 'Spawn or resize a NavMeshBoundsVolume in the current editor level.' It also clarifies idempotent behavior by noting that an existing volume will be resized and repositioned rather than duplicated. However, it does not explicitly differentiate itself from the similar sibling 'place_navmesh_bounds_volume'.

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?

The description implies usage for setting up AI navigation in the current level, especially with the statement that after placement the navigation system can be rebuilt so AI characters can immediately use the navmesh. It does not provide explicit when-to-use or when-not-to-use guidance, nor does it mention alternatives such as 'place_navmesh_bounds_volume' or 'nav_create_link_proxy'.

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