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

Annotations only declare readOnlyHint=true, so the description earns credit for disclosing the pagination behavior ('50 per page') and the underlying endpoint (GET /v2/event-logs). It still omits auth requirements and return shape, but the pagination detail is a genuine behavioral trait beyond the annotations.

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 dense sentence that front-loads the resource and scope, then lists content and filters, closing with the endpoint. Every clause carries information with no padding.

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?

For a read-only list tool with 0 required params, no output schema, and fully documented parameters, the description covers resource, content, filters and pagination adequately. It could say more about default sort or response envelope, but nothing critical is missing.

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 the enum values and Unix-timestamp formats fully documented in the schema, so the baseline is 3. The description's 'filterable by user, activity and time' merely restates what the schema already specifies.

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?

Specific verb+resource ('The school's activity log'), and it goes further by enumerating the concrete event content (registrations, logins, purchases, enrollments, completions, certificates, subscription changes). No sibling tool covers event logs, so an agent can identify it unambiguously.

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?

It implies usage by describing the filterable dimensions ('filterable by user, activity and time'), which hints at audience/audit scenarios, but it never states when to prefer this over siblings like list_payments or get_user_course_progress, nor any exclusions. Usage is inferred, not prescribed.

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