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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), and the description adds genuinely new context beyond them: archive rows are reconstructed from archived pages and are never live observations, plus the free-tier result cap of three rows. These are real behavioral caveats an agent needs. It stops short of describing freshness or how the tier limit is surfaced in the response.

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?

Three short sentences with zero filler, front-loaded with what the tool returns before the caveats. Every sentence carries distinct information (content, data provenance, tier gating); nothing repeats the title or annotations.

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 parameters and no output schema, the description must carry the full load, and it does describe the returned fields and the provenance/tier caveats. It is nearly complete, missing only freshness/latency expectations and any note on how 'evidence' rows relate to the rate rows.

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 takes zero parameters, which is the baseline-4 case. The description does not need to compensate for any schema gaps, and the schema's empty properties object is consistent with the no-argument description.

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 resource and scope: published GPU rental rates in USD per GPU-hour, with hardware variants, pricing basis and dated changes. It is clear what the tool returns, but it never distinguishes itself from siblings gpu.changes and gpu.history, so an agent must guess which of the three to call.

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 or when-not-to-use guidance, and no mention of the obvious alternatives gpu.changes (what changed) or gpu.history (time series). The only routing signal is implicit in the word 'board'. The tier note ('Pro unlocks full coverage; free previews three rows') is an access constraint, not usage guidance.

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