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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new behavioral context: the content is 'reviewed', responses include source URLs, and no account, team or employee information is accessed. That privacy/scope disclosure is exactly the kind of value annotations cannot carry, though nothing is said about refresh cadence or coverage 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?

Three short sentences, front-loaded with the capability and then the scope exclusions, with zero filler. The only inefficiency is that 'Select a topic' spends a sentence on instruction without conveying the information the agent actually needs.

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 privacy/scope disclosures cover the main risk surface. But for a two-parameter tool whose enums are entirely undocumented in the schema, leaving every topic value unexplained is a real completeness gap.

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 both parameters are bare enums, so the description must carry the burden. It only says 'Select a topic' without naming or explaining any enum value, and the values ('eor', 'cor', 'cost_estimator') are opaque acronyms an agent cannot resolve without domain knowledge. The 'language' parameter is never mentioned at all.

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 and resource – 'Read reviewed public PIO product information with source URLs' – and scopes it against pricing content. An agent can distinguish it from the cost-estimate siblings because the description explicitly says it does not quote customer-specific pricing. The unexplained acronym 'PIO' costs it a point on absolute clarity.

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?

'Select a topic' implies usage, and the pricing disclaimer implicitly points at the estimate siblings for cost questions, but the description never names those alternatives or states the positive condition for choosing this tool. The agent must infer routing from the exclusion alone.

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