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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds genuinely useful behavioral context beyond those: 'Free' discloses the cost of calling, and 'Nexus credits are never treated as payment' flags an important exclusion that prevents an agent from expecting credit-based settlement. No contradiction with annotations.

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. The most decision-relevant fact ('Free') is front-loaded, the second sentence specifies the deliverable, and the third states a critical caveat about Nexus credits. Every sentence earns its place.

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?

Completeness is strong given the low complexity: one parameter, 100% schema coverage, an output schema exists, and annotations cover the read-only/idempotent/non-destructive profile. The description explains the return contents and the cost caveat. The only notable gap is the absence of routing guidance toward fund_field_agent_task, which is already accounted for in usage_guidelines.

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 the task_id parameter is already well documented as 'Nexus task id to price for the matching AlpineLead Field Agent.' The description reinforces the pricing context by mentioning 'execution preflight' but adds no parameter-level meaning or format information beyond what the schema provides. Baseline 3 is appropriate.

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 specific action and resource: 'Returns Field Agent execution preflight plus traditional Stripe and native MPP payment options' clearly defines a quote/proposal operation. The title and description together distinguish it from siblings like fund_field_agent_task (execution) and check_field_agent_payment (status check), so an agent can select it without opening schemas.

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?

No explicit when-to-use or when-not-to-use guidance is given. The description does not mention the fund_field_agent_task alternative for actually paying, nor does it state that this tool is the pre-payment step. Usage context is only implied by the word 'quote' in the name rather than stated in the description.

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