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

Annotations already declare readOnlyHint and openWorldHint, so the bar is lower, yet the description adds real behavioral context: an unknown id yields a not-found, and it explicitly enumerates what is never returned (review text, reviewer/staff identities, client records, availability, booking and payment data). That negative-space disclosure prevents an agent from expecting data the tool cannot supply.

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 purpose is front-loaded, but the return-value enumeration is a single very long run-on clause that is largely redundant given an output schema exists. The trailing two sentences (id source, not-found, exclusions) are efficient; the middle catalogue of fields could be compressed without loss.

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 detail endpoint with full schema coverage and an output schema, the definition covers invocation, id provenance, market scoping, failure mode, and data exclusions. Nothing an agent needs in order to call it correctly is missing; the only excess is restating return fields already carried by the output schema.

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 both the id and country parameters are already documented in the input schema, including the not-found behavior and the country default. The description reinforces the id's provenance from sibling tools but adds little parameter meaning beyond the schema, so the baseline of 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?

Opens with a specific verb+resource ("Get one Booksy business's detail record") and then names the exact contents: name, slug, categories with web slugs, region chain, address/coordinates, images, service menu with prices and durations, hours, amenities, booking policy, contact links, review scores. It also names the two sibling tools that produce valid ids, so the agent can distinguish it from booksy_businesses 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?

Gives clear entry conditions: pass a numeric id from booksy_businesses or booksy_treatment_hints, and pass the same country that produced the id because ids are per-market with a default of us. It does not explicitly describe the alternative path when the agent only has a name or city, but the id-source guidance is concrete enough for correct invocation.

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