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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=true), so the description only needs to add context. It does: it discloses the sort order ('newest first'), the returned fields (id, name), and the underlying endpoint GET /calendars/templates. Pagination behavior is not mentioned, which is the only notable gap.

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?

Two compact sentences with no filler; the resource and its distinguishing detail lead, and the follow-up guidance trails. Nothing redundant or misplaced.

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 present, the description usefully supplies the return shape (id, name) and ordering. It stops short of stating result cardinality or pagination, which for a list endpoint is the one remaining thing an agent would want.

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% and the single optional parameter is an enum fully documented in the schema. The description restates both modes ('calendar landing page templates or embeddable calendar templates') but adds no format or defaulting 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?

The description names a specific resource (the account's calendar landing page and embeddable calendar templates) and its returned fields (id, name), with ordering (newest first). It is clear what the tool returns, though it never explicitly distinguishes itself from the sibling addevent_list_event_templates, which an agent could easily confuse it with.

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?

The second sentence gives a downstream workflow cue: 'Use the id as landing_page_template_id / embeddable_calendar_template_id on a calendar.' That implies when the IDs are needed, but there is no explicit when-to-use or when-not, and no comparison against list_event_templates or list_calendars.

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