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

Annotations already declare readOnly, idempotent, openWorld and non-destructive behavior, so the safety profile is covered. The description adds genuine value by disclosing the result ranking ('best-known first') and the returned fields, but says nothing about result limits, empty-match behavior, or rate 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?

One compact sentence with the input and output shape front-loaded; the parenthetical about Clearbit is useful context rather than padding. Nothing is wasted, though the structure is dense enough that the input mapping is slightly buried.

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-parameter lookup with no output schema, the description compensates well by enumerating the returned fields and their ordering. It is only missing peripheral details such as result count and behavior on no match.

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 single parameter has 100% schema description coverage, so the baseline is 3. The description does add meaning by clarifying the parameter accepts either a full company name or a prefix, which the schema's 'e.g. stripe' does not make explicit.

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 mapping: a company name or prefix query returns a list of {name, domain, logo, description}. It is clear what the tool does, but it never differentiates itself from close siblings like company_profile or company_logo, which an agent must choose between.

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 explicit when-to-use guidance or mention of alternatives. The reader must infer from 'Clearbit Autocomplete replacement' that this is the prefix-search entry point, but nothing tells the agent when to prefer company_profile over this, or how partial matches are treated.

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