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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's added value is ordering ('newest first') and the enumerated result fields, which is useful given no output schema. It omits practical behavior such as the hard 20-item cap, what an empty result means, and how pagination/large result sets behave.

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?

A single front-loaded sentence that leads with the resource and then the return shape; the field enumeration earns its space because there is no output schema. Slightly list-heavy but no filler 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?

Covers what the tool returns and its ordering, which is the main gap for a read-only list tool, but with five parameters at 20% schema coverage it should explain the date-range and asset filters and the limit cap in order to be callable with confidence. Adequate but incomplete.

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 only 20% — only 'speaker' is documented in the schema (and even that format example is in the schema, not the description). The description says nothing about the to/from date window, the asset filter, or the limit ceiling of 20, so the four undocumented parameters are left entirely unexplained.

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?

Names a specific resource (a speaker's on-air ATC calls) plus the record it returns and the sort order, so an agent can distinguish it from asset-scoped or leaderboard siblings. It never names the alternatives (asset_calls, calls_leaderboard) explicitly, so differentiation is by inference rather than statement.

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?

There is no when-to-use, when-not-to-use, or alternative-tool guidance; the closest signal is 'Results come from the ATC leaderboard,' which hints at a related source but doesn't route the agent between speaker_calls, asset_calls and calls_leaderboard. Usage is only implied by the described scope.

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