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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the description sensibly spends its words elsewhere: it discloses the filtering criteria (ZIP coverage plus online-booking acceptance) and the result cap of 5 with a booking_id per company. Still missing is what happens on zero matches and whether results are ranked.

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?

Two sentences, zero filler: the first carries scope and the filter conditions, the second carries the return shape. The most decision-relevant constraint (ZIP coverage + online bookings) is 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?

For a read-only search with no output schema, the description covers the query semantics and the essential shape of the return (up to 5 companies, each with a booking_id). It could go one step further on empty-result behavior, but nothing an agent needs to call it correctly is absent.

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 all three parameters are already documented, including the example phrasing for 'service'. The description reinforces that the service trade list is closed-ish and that city is optional, but adds no syntax or matching behavior beyond the schema, 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?

States a specific verb ('Find') plus a tightly scoped resource (home/business service companies that cover a US ZIP and take online bookings), with trade examples that make the domain unmistakable. An agent can tell this is the search step that precedes book_visit and get_availability without opening the 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?

Usage is only implied: the tool finds companies and returns a booking_id, which suggests the follow-on booking flow, but the description never says 'call this before book_visit' or when to prefer it over get_availability. No exclusions or prerequisites are stated.

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