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

Annotations already declare readOnlyHint=true and openWorldHint=false, yet the description still adds real value: it validates the input exactly as the real call would, runs nothing, and holds no funds — key facts for a cost-estimation tool. This is meaningful disclosure beyond the annotation set.

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 sentences that are front-loaded but grammatically muddled — 'What a call to a tool would hold for this input before it runs (its most it can cost)' reads awkwardly, and the USDF/USD duality is unexplained. It is short but not clean.

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 usefully characterizes the return: the maximum cost in USDF and USD plus the tool's price. It also covers the auth requirement and the no-side-effect guarantee, leaving little an agent needs but doesn't have.

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% and both parameters are documented in the schema (tool id from list_tools, input matching the tool's input schema). The description adds no syntax or format detail beyond that, 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?

Names a specific verb (quote) and resource (a call to a tool) and states the output dimension (cost in USDF and USD). It does not, however, distinguish itself from the sibling tool named simply 'quote', leaving ambiguity about which quoting tool to pick.

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?

'Before it runs' implies the pre-flight use case, and 'No key needed' tells the agent it can be invoked unauthenticated. There are no explicit when-not conditions and no comparison against the sibling 'quote' tool, so the routing guidance is only implied.

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