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

Beyond the annotations (write, open-world, non-idempotent, non-destructive), it discloses cost ("Free to the homeowner"), callback SLA ("within the hour during business hours"), and that a reference is returned. It does not warn that repeated submissions create duplicate requests despite idempotentHint=false, which is the one behavioral gap.

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?

The core scope and the sibling routing are front-loaded, which is good, but the parenthetical "(a vetted local pro calls back within the hour during business hours)" redundantly restates the preceding sentence about a vetted pro calling back. That duplication costs space without adding information.

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?

For a 7-parameter write tool with no output schema, the description covers cost, turnaround, consent, and the return value ("a reference and what happens next"). Only the duplicate-submission behavior is left unaddressed.

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 100%, so the baseline is 3, but the description adds real meaning: name and phone must belong to the actual consenting requester rather than the agent, and ZIP correctness should be validated via check_service_area. That constraint is not expressed anywhere in the schema.

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 verb and resource ("Book snow plowing") plus a geographic scope ("Morristown area") and the constraint that it is on behalf of a consenting real person. An agent can distinguish this from check_service_area and get_service_info without opening any 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?

Gives an explicit prerequisite and names the sibling to use first: "Check the ZIP with check_service_area first if unsure." It also implies the consent precondition for booking. It does not say when to prefer get_service_info instead, so the routing is clear but not exhaustive.

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