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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the exact-match scoping rule and exposes the underlying route, but says nothing about behavior on no-match (empty vs 404) or auth/rate limits. With annotations carrying the main burden, this is an appropriate 3.

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 compact sentences, front-loaded with the resolution rule before the endpoint reference. No wasted words; the endpoint string is arguably redundant but cheap.

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 need not explain return values, and annotations cover the safety profile for this single-param lookup. The only omission is what happens when no matching guest exists, which keeps it out of 5 territory.

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% and the single param is already documented as 'Guest primary email address.' The description's addition of 'exactly' conveys exact-match rather than fuzzy/substring semantics, a small but real increment. Baseline 3 holds since the schema does the heavy lifting.

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 (get) and resource (guest), plus the distinguishing qualifier that this resolves by email rather than by id, which separates it from tokeet_get_guest and tokeet_list_guests. It stops short of explicitly naming those siblings, so differentiation is implied by the 'by email' qualifier rather than stated.

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?

No when-to-use guidance is given: it never says to prefer this over tokeet_get_guest when only an email is known, nor any prerequisite or condition. The endpoint path implies a lookup use case but nothing is stated, leaving the agent to infer selection.

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