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

Annotations already establish that this is a read-only, idempotent, non-destructive operation, so the safety profile is covered. The description adds useful behavioral scope by listing the validation categories, but it does not disclose what a validation result looks like, whether failures are reported per check, or how partial or failed validation should be interpreted.

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 a single front-loaded sentence with no filler. Every listed item corresponds to a validation concern and earns its place.

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?

There is no output schema, so the description should explain return values or at least the shape of a validation result, but it does not. Combined with the lack of parameter explanation and absence of usage guidance, the definition is incomplete for a nested-object validation tool.

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 reported as 0%, so the description should compensate, but it only vaguely references 'expected outputs' and does not explain projectId, the input.reason field, or the structure and semantics of expectedOutputs entries. The nested schema contains some descriptions, but the tool description itself does not add meaning beyond a passing mention.

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 gives a specific verb (validate) and resource (project map), and enumerates the validation dimensions: canonical GMS, renderer compatibility, referenced resources, and expected outputs. It is clearly distinct from sibling mutators like project_add_layer or project_set_basemap, though it does not explicitly name or contrast a sibling tool.

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 does not state when to use this tool, when not to use it, or which alternatives to consider. There is only an implied usage from the schema's example reason, "before final response," but the description itself provides no routing guidance.

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