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

Annotations already declare readOnly, non-destructive, openWorld=false, but the description adds context annotations cannot: output is a 'suggested' plan with listing links and that no date validation or booking occurs. That negative capability is the highest-value disclosure here, since check_availability is a sibling an agent might otherwise assume is invoked internally. It stops short of saying how deterministic or personalized the plan is, so not a 5.

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, front-loaded with what is produced, followed by the scope limitation and the redirect. No filler, no restatement of the title.

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 does state the return shape qualitatively ('structured plan with listing links'), and it closes the biggest ambiguity (no dates, no booking). Minor gap: it does not say whether pricing or availability status appears in the plan, though openWorld=false and readOnly=true suggest published static data.

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% with enums and defaults already documented for pace, budget, travelers, and startCity. The description adds no parameter-level guidance (e.g., how interests influence selection or what day-count means at the 14-day max). Baseline 3 applies when the schema carries the load.

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 — 'Generate a suggested day-by-day Armenia itinerary' — and names the data source (Revamp's published listings) plus the output form (structured plan with listing links). It is clearly distinguishable from get_quote, check_availability, and search_listings without opening any 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?

Explicitly bounds the tool: it 'doesn't check dates or book anything — use get_quote for that,' naming both the exclusion and the alternative sibling. An agent knows both when to call this and where to route follow-up booking/availability work.

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