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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds two useful facts beyond annotations: results are ranked by peer prevalence and the tool is a 'PRO' (tier-gated) feature. It says nothing about pagination, row shape, or cost, which matters since no output schema exists.

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 tight sentences, front-loaded with the 'PRO' tier flag and the core definition before the audience note. Nothing is wasted, though the extreme terseness leaves several dimensions thin rather than being genuinely economical.

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?

With no output schema, the description carries more burden: it never describes what a whitespace row contains or how results are ordered beyond 'ranked by peers'. For a read-only PRO tool with fully documented params this is adequate but not complete.

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 100%, so slug, limit, and context are fully documented in the schema itself. The description adds no syntax or format detail beyond it (e.g. it never connects 'ranked by peer count' to the limit parameter), so the baseline 3 applies.

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 the specific resource (a 'whitespace' list of what peers run that the company doesn't) and its ranking basis (how many peers carry it), so the agent can tell what it returns. It does not, however, differentiate from near-siblings like company_gaps or company_peers, which an agent could easily confuse with this tool.

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?

'The opening list for a vendor selling into the account' implies a use context but states no explicit when-to-use, when-not, or named alternative. The agent must infer that this is the entry-point tool rather than, say, company_gaps.

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