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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds useful behavior beyond that: a hard cap of 20 results, the exact fields returned, and the implied default window of the next 30 days. It says nothing about price freshness, empty-result behavior, or throttling, so with annotations carrying most of the load a 3 is fair.

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?

The purpose and scope are front-loaded, followed by the return contract and then illustrative queries, so an agent can stop reading early. The Turkish translation line is arguably redundant for an English-speaking agent but is a deliberate bilingual aid rather than filler.

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 seven all-optional parameters and no output schema, the description sensibly documents the return fields and the result cap, which the schema does not. It omits only edge-case guidance such as behavior when mood and category conflict, which is minor for a read-only search 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 coverage is 100%, so every parameter already has its own description including examples and defaults, which sets the baseline at 3. The description only restates that mood matching is optional and that city/date act as filters; it does not, for instance, clarify how place interacts with city or how query combines with category.

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?

The description names a specific verb (find/search) and resource (upcoming events), enumerates the covered categories, and defines scope as Turkey plus selected cities abroad with optional mood matching. It is clearly distinguishable from siblings such as get_event (single event lookup) or list_moods (reference data).

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?

Three concrete example utterances ('what's on in Istanbul this weekend', the sad-mood Izmir query, 'jazz concerts in Ankara in December') show exactly which natural-language requests route here, and the mood parameter points to list_moods. It stops short of stating exclusions, e.g. when to prefer compare_ticket_prices or find_nearby_places.

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