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

The annotations already cover read-only, idempotent, and non-destructive behavior. The description adds that the call is free and returns machine-readable schema definitions, but it does not describe the response shape or how the included schemas are organized. No contradiction with 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?

A single sentence contains the pricing signal, target tools, and output type with no filler. The wording is slightly awkward ('distinct... schemas'), but nothing is wasted.

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 no-input, read-only metadata tool, the description is nearly complete: it identifies the free schemas for the two relevant tools. Because there is no output schema, a slightly clearer statement of what is returned (one schema per tool) would fully close the 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?

The tool has zero parameters, so there is no parameter burden for the description to carry; the baseline of 4 applies. The description does not introduce any parameter-related ambiguity.

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 names a specific action ('get') and resource ('machine-readable schemas') for preview_company and verify_company, so an agent can tell this is a schema-metadata tool. Some ambiguity remains around 'distinct' and 'evidence result,' and the title mentions only verify_company while the description covers both tools.

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 clear context for use: this is the free way to obtain schemas for the limited preview_company tool and paid verify_company evidence result. It does not explicitly state when not to use it or name an alternative, but for a zero-parameter schema tool the context is sufficient.

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