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

Annotations already declare readOnly/idempotent/closed-world, and the description adds real value beyond them: no auth required, the response is grouped by view, and isometric results carry per-direction previews. It does not discuss limits or result size, so it falls short of fully rich behavioral disclosure.

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?

Dense and mostly front-loaded, with the sequencing instruction and return contents stated compactly. Leading with 'No authentication required' rather than the tool's purpose is a minor ordering weakness, but nothing is wasted.

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 carries the return-shape burden and does it well (grouping, per-action fields, preview URLs, isometric direction previews), plus the auth and sequencing context. It omits any notion of catalog size or result limits, a small gap for a full-catalog list 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 coverage is 100% with an enum, so the schema already defines view_type and its allowed values. The description largely restates the three view names ('side-scrolling, isometric, topDown') that the enum provides, adding little new parameter meaning; 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?

Specific verb+resource: 'List every supported animation action_id grouped by camera view', with the concrete return contents (preview image URLs, action_version, supports_upscale) named. It is clearly distinct from siblings like list_models or get_pricing without needing their schemas.

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?

Gives an explicit sequencing rule: 'Call this before generate_sprite to pick a valid action_id + view_type', which tells the agent exactly when this tool matters. It stops short of a 5 because no when-not condition or alternative path is stated, though the listed siblings are not true alternatives.

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