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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false, so the safety profile is covered. The description contributes one genuinely useful behavioral note — Space Score is only present 'when it is ranked' — but omits matching/ambiguity behavior and what is returned when nothing matches.

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 enumerates the payload without filler; every clause carries information. It is dense but not padded.

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 correctly carries the return-shape burden by listing the profile fields, including the conditional Space Score. It falls short only on edge cases such as zero matches or multiple matches from the 1-5 limit.

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 schema documents both parameters at 100% coverage, including the name/slug/ticker formats and the 1-5 result limit, so the baseline is 3. The description adds nothing about how matching works or what happens when several companies match the query.

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 (space company) and enumerates the returned facts, so an agent knows exactly what a call yields. It does not, however, contrast itself with siblings like funding_round_history or space_score_history, which overlap on some of the same fields.

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 statement of when to use this tool versus the many sibling lookups; the overlap with space_score_history and funding_round_history is left for the agent to infer. Only the implicit 'lookup by name/slug/ticker' usage is signaled, via the schema rather than the description.

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