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

Annotations already declare readOnlyHint/idempotent/destructive=false, so the safety profile is covered. The description adds genuine operational context beyond that: a single call aggregates many categories, each result carries its own page and a tracked booking link, and the agent must pass affiliate links through unchanged — a non-obvious obligation worth disclosing.

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?

Front-loads the trigger ('Use when the user is planning a trip...') before the payload description, which is the right order. It is somewhat dense in the middle enumeration and the parenthetical '(read-only)' duplicates the annotation, but every sentence carries routing or behavioral value.

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 usefully enumerates what comes back and in what shape (each item has a page plus booking link), and the schema covers all inputs. Mild gaps remain about result count, pagination or how festivals are date-filtered.

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 city/country slugs, did_you_mean behavior and ISO date fields all documented in the schema. The description adds no parameter-level detail beyond the schema, so the 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+resource (returns things to do in a city) and enumerates the concrete payload: food tours, classes, tastings, attraction tickets, festivals, places to eat, stays, car hire. The 'START HERE for "what can I do in <city>?"' framing distinguishes it from narrow siblings like experiences, festivals, tickets and stays.

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 explicit trigger conditions with two realistic user utterances and marks itself as the entry point for city-activity questions, which routes the agent correctly. It stops short of naming when NOT to use it or which sibling to fall back to (e.g., car_hire alone, plan_day, itineraries).

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