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, and an output schema exists so return format needn't be spelled out. The description usefully characterizes the cardinality ('every subject for one category') and the chaining relationship, but adds little else about behavior or 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 sentences, front-loaded with what the tool returns and followed by the downstream hand-off. Every clause earns its place; the phrasing 'for that subject's full profile and price guide' is slightly informational but justified as routing context.

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 single-param listing tool with an output schema, the description supplies what is missing: the cardinality, the id semantics, and the upstream/downstream tool chain. Nothing essential to correct invocation is absent.

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% and there is one required param, so the description must compensate. It does so by explaining that category_id originates from psa_autographfacts_categories, giving the agent the source needed to supply a valid value rather than leaving it bare.

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 (lists) and resource (every autograph subject PSA AutographFacts lists for one category), and even specifies the payload (each with the numeric subject_id). It distinguishes itself from psa_autographfacts_subject (full profile) and psa_autographfacts_categories (the category source) without requiring the agent to open any schema.

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 a clear workflow: take subject_id from here and pass it to psa_autographfacts_subject, and take category_id from psa_autographfacts_categories. That is explicit routing to the right siblings. It stops short of saying when NOT to use it, so it is not a full 5.

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