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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and open-world reach are covered. The description adds one behavioral detail — that the response contains matching result cards — but says nothing about pagination, rate limits, or ranking, so it is modestly additive over 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?

Two sentences, no filler, with the core action and scope front-loaded before the usage hint. It is tight and readable, though the second sentence is slightly redundant with the first.

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 no explanation, and annotations cover the safety profile. For a three-parameter search tool the description supplies enough for correct invocation, missing only finer routing detail versus the detail/chart siblings.

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%, so q, type, and limit are all documented in the schema. The description only echoes "by query and result type," adding no format, syntax, or matching-behavior detail beyond the structured fields, which is the expected baseline when the schema carries the load.

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 (Search) and enumerates the resource types (films, people, lists, tags), so the agent knows exactly what universe is covered. It does not name any sibling explicitly, so it stops short of full differentiation from letterboxd_film, letterboxd_member, or letterboxd_popular.

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?

"Use it to discover films or members by name" implies the discovery scenario, which is useful context, but there is no explicit when-not guidance and no alternative tool is named for drilling into a specific film, member, or the popularity charts.

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