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

Annotations already establish readOnlyHint=true and destructiveHint=false, but the description adds real behavioral value: 'Never returns playback or private data' and the note that the URL is revalidated against a current public database gate. These disclose data-scope and freshness behavior beyond the annotations.

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?

Three short sentences, front-loaded with the core action and the safety guarantee. The 'same current public database gate as WebMCP' clause is somewhat jargon-heavy for the value it adds, but overall it is tight.

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?

An output schema exists, so return values need not be explained, and the description adequately covers the read and its data-scope limits. However, with 0% schema coverage on the single parameter and the URL-vs-id ambiguity, an agent is left with a gap in how to construct the call.

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 0% and the sole parameter is named 'id', yet the description frames the input as a 'public film URL returned by search.' This adds some meaning about what the id should contain, but leaves ambiguity over whether it is a full URL or an identifier, and gives no format details.

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 states a specific verb and resource ('Read a public film URL returned by search') and names a sibling tool (get_documentary) for a distinct use case. It is disambiguated from get_documentary, though the 'URL' framing conflicts slightly with the 'id' parameter name.

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 ties usage to search output ('a public film URL returned by search') and routes to get_documentary for 'full public editorial details.' That is clear context, but it doesn't explicitly state when NOT to use fetch versus other sibling readers like get_article or get_person.

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