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

readOnlyHint=true already declares this is a safe read, so the description is not carrying the safety burden. It adds the upstream endpoint and the fact that embedded collections are opt-in, but says nothing about failure behavior (e.g. missing id) or response shape.

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 terse sentences: identity first, upstream mapping second, optional-parameter pointer last. No filler, and the core purpose 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 single-record read with a fully documented 4-parameter schema and no output schema, the description covers purpose, endpoint, and the opt-in includes adequately. Minor gap: no note on what happens when the id does not resolve.

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 every parameter, including the three include_* booleans, is already documented in the schema. The description's mention of 'charges/guest/tags' restates those parameters without adding format or default semantics, so 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 (Fetch) and resource (a single booking), scoped by id, which cleanly separates it from list_bookings and get_guest/get_payment siblings. The API path mapping (GET /v2/bookings/{id}) reinforces exactly which remote call this wraps.

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?

The third sentence tells the agent the optional includes exist ('Opt into embedded charges/guest/tags'), which is useful context, but there is no explicit when-to-use guidance or routing versus alternatives such as list_bookings or ownerrez_request. Usage is implied rather than stated.

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