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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered without the description. The description adds domain context (Istanbul timezone, biseyvarmi.com confirmation link) but says nothing about paging, cost, or auth, and most of what it lists is return content already covered by the output schema.

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?

A single front-loaded sentence identifying the operation first, then enumerating the returned fields. The field list is slightly dense but every clause maps to something an agent would want to know.

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?

Rich annotations plus an existing output schema mean the description only needs to cover purpose and workflow linkage, which it does. An agent can select and invoke this tool correctly from what is given.

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?

With a single parameter at 100% schema coverage, the schema already explains that 'id' comes from search results, so the baseline is 3. The description's 'one event found with search' merely echoes that constraint without adding format or validation details.

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 states a specific verb and resource: fetch full details of one event, and explicitly ties it back to a prior 'search' rather than a list operation. That separates it from the 'search' sibling, though the second sibling 'search_events' is never acknowledged.

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?

'found with search' implies the prerequisite workflow (search first, then fetch by id), which is useful implicit guidance. There is no explicit statement of when to prefer this over the siblings or when not to call it.

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