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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds real value by disclosing that the response includes the booking link and check-in state, but says nothing about error behavior (e.g., unknown id) or what happens for guests with no booking.

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 short sentences, front-loaded with the action and resource, with the endpoint appended as a compact technical footnote. No filler or redundancy.

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?

With no output schema, the description carries some burden for return values and it names two useful fields, but a full guest object likely has more fields and possible 404 behavior that remain undisclosed. Adequate but not complete for a record-fetch tool.

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 single guest_id parameter is fully documented, including its provenance. The description restates only 'by id' and adds no format or derivation detail beyond the schema, 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 and resource ('Get one guest by id') plus the notable payload contents (booking link, check-in state) and the underlying endpoint. It implicitly distinguishes itself from trekksoft_list_guests by the singular/by-id scope, though it never names the sibling explicitly.

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: 'by id' signals a single-record fetch after an id is known, and the schema (not the description) points to trekksoft_list_guests as the id source. No explicit when-to-use or when-to-prefer-a-list statement appears in the description.

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