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; the description adds the non-obvious traits of time-sorting and the composition of returned item categories. It does not mention volume limits or whether the window can be arbitrarily wide, which is the one remaining behavioral 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 content composition leads and the read-only reassurance trails. Slight redundancy with the annotations in the second sentence costs it a point.

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?

An output schema exists, so return-value shape need not be explained, and the description still covers what kinds of records appear and how they are ordered. For a two-parameter read-only listing tool this is sufficient to invoke it correctly.

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 both parameters already document ISO 8601 format plus the exclusive end of the window. The description only restates 'between two dates' and adds no formatting, timezone, or boundary nuance beyond the schema, so 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 (Content Calendar items) and enumerates exactly what is included: planned items with type and status, scheduled/published blog posts, published podcast episodes, and ready video clips. It does not, however, distinguish itself from siblings like list_events, list_appointments, or list_media_assets, so an agent must infer the boundary.

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 phrase 'between two dates' implies the usage context (a date-windowed read), but there is no explicit when-to-use, no when-not-to-use, and no named alternative among the many list_* siblings. The agent gets an implied scenario but no routing guidance.

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