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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful substance about the nature of the returned content (real, captioned, PSA-held examples), but discloses nothing about pagination, image access, or size limits.

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 tight sentences, front-loaded with what the tool returns and then the parameter's origin. No padding or redundancy.

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 details need not be spelled out, annotations cover the read-only nature, and the single parameter's source is explained. Nothing essential for correct invocation is missing.

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 0%, so the description must carry the load: it explains that the id is numeric and originates from a psa_ticketfacts_subjects result. Note the description writes 'subject_id' while the schema property is 'SubjectID' (a minor casing mismatch), but the semantic link is clear.

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: an exemplar image gallery for one event, with real captioned ticket examples used as authentication reference material. It is clearly distinguishable from psa_ticketfacts_subjects (which supplies the id), though it does not name that sibling explicitly as an alternative.

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?

The description tells you where the required identifier comes from ('from a psa_ticketfacts_subjects result'), which implies the workflow. It gives no explicit when-to-use vs when-not guidance or contrast with the other psa_ticketfacts tools beyond that.

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