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

Beyond the annotations (all false), the description discloses critical behavior: it is project-scoped, acts only on the explicit project_id, returns the project identity, changes no media or EDL, and is not a tool limit. This adds valuable context about side effects and scope that annotations do not provide.

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 dense sentence with several clauses, but it is front-loaded with the most critical scoping note. Every sentence earns its place—no filler—though a slightly more structured format (e.g., separating usage condition from side-effect disclosure) would improve readability.

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 schema-expansion tool, the description covers scope, side effects, usage trigger, and immediate next steps. It does not specify the exact return format beyond 'project identity with its result', and does not mention error handling or what happens with invalid domains, but these are minor gaps given the tool's simplicity and the lack of an output schema.

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 50% (project_id has description, domains does not). The description adds context that 'domains' are the capabilities to load, but does not explain how to select them or what each domain maps to. The enum values are in the schema, so the description partially compensates but could be more explicit about the domains parameter's meaning.

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 explicitly states the tool loads additional tool schemas for the next reasoning step when the current catalog lacks a needed capability. The verb 'load' and resource 'tool schemas' are specific, and the tool is clearly distinct from all siblings (none of which perform this function).

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?

It gives an explicit condition for use: when the compact catalog does not expose a capability you need. It also instructs to 'request any relevant domains, then continue immediately', making the usage scenario concrete. No alternative tool is named, but none exists—this is a unique capability.

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