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

Annotations already declare readOnly, idempotent, non-destructive, open-world, so the safety profile is covered. The description adds genuinely new context: it calls only the free gateway quote and 'neither operation purchases upstream APIs or handles buyer funds,' which prevents a costly misread. It stops short of saying what happens when the ceiling is too low (error vs. empty result).

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: purpose, gateway scope, alternative, then the no-purchase caveat. The key differentiator and the sibling routing are front-loaded.

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?

No output schema exists, yet the description never says what a quote contains (price, provider identity, availability) or whether an unmeetable ceiling yields an error or an empty result. For a quote tool with three undocumented parameters, that leaves a real gap the agent must discover by calling.

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 coverage is 0%, so the description must carry the load. It does explain two parameters implicitly — 'one named provider API capability' for capability and 'strict price ceiling' for max_unit_price_usd — but 'goal' is left undefined and no formats or limits (e.g., USD granularity, capability naming convention) are given.

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?

States a concrete verb and resource ('free price comparison for one named provider API capability within a strict price ceiling') and immediately distinguishes itself from the batch sibling. An agent can tell this apart from kevaremesh_quote_provider_batch without opening either schema.

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?

Explicitly names the selection condition (single capability, free comparison, strict ceiling) and routes 2–5 needs to kevaremesh_quote_provider_batch by name. No inference required about when to choose this tool.

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