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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds genuinely useful behavior: it returns titles, links and view counts, the catalog is limited to the 15 most recent films, and no account is required. That is real context beyond the structured fields.

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 core purpose is front-loaded, but the middle sentences describing the films' themes and the generated-character gimmick are marketing color that does not help an agent select or invoke the tool. Useful constraints (15-film limit, no account) are buried at the end.

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 read-only search with no output schema, the description covers return shape (titles, links, view counts), catalog scope, and auth requirements, which is close to what an agent needs. Only the relationship to the sibling find_scene tool remains unaddressed.

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%, so both parameters (about, limit) are already documented in the schema, including the empty-string case and the default. The description adds no syntax or format detail beyond that, so the 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?

States a specific verb+resource: 'Finds one of CMeIn's short films by what it is about.' An agent can tell what it retrieves and the matching criterion. It does not, however, distinguish itself from the sibling find_scene, which sounds closely related.

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?

Usage is implied rather than stated: 'Covers the 15 most recent films only' and 'No account needed' give context for when it works, but there is no explicit when-to-use guidance or routing away from sibling tools such as find_scene.

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