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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety and side-effect profile is fully covered structurally. The description adds only content scope (what events exist and that dates/pages are returned); it says nothing about ordering, freshness, or whether past events are excluded.

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?

One front-loaded sentence that leads with the resource and scope before the parenthetical examples. The example list is slightly long but each example earns its place by anchoring what counts as an 'event'.

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 carries the return-value burden and does deliver it ('with their dates and page'). Combined with annotations covering safety and the closed-world scope, this is nearly complete for a simple no-arg list tool; only result ordering/freshness is unstated.

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?

The tool takes zero parameters, so the schema needs no supplementation and the baseline is 4. The description correctly avoids inventing parameter semantics for a no-arg call.

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 the resource precisely (current and upcoming sales events and campaign pages on this site) and grounds it with concrete examples (Black Friday, CyberDay, Hot Sale, seasonal pages). It is clearly distinct from siblings like list_coupons or list_categories by resource, though it never explicitly contrasts itself with them.

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?

Usage is implied by the scope words 'current and upcoming' and 'on this site', which tell the agent what subset this tool covers. However, there is no explicit when-to-use, when-not-to-use, or pointer to an alternative (e.g., list_coupons or site_info) for related queries.

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