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

The description repeats the readOnlyHint annotation, but it adds a meaningful extra behavior: saved words are not publication proof and linkage/calendar_sync should be checked. This is exactly the kind of interpretation hazard that structured annotations would not convey. However, 'X production switch' and 'calendar_sync' remain undefined and somewhat opaque.

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?

The description is short and front-loaded: it lists the returned content first, adds the read-only property, then ends with the caveat. Every sentence earns its place, even though the first phrase is telegraphic.

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 zero-input, read-only tool this is mostly sufficient to invoke safely, but with no output schema the agent must guess the structure and meaning of 'linkage', 'calendar_sync', and 'X production switch'. The caveat adds value, but those undocumented output concepts keep it from being fully complete.

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 has zero parameters and the schema description coverage is 100%, so there are no parameter meanings left for the description to clarify. Baseline 4 is appropriate for a no-parameter tool.

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?

Although it lacks an explicit verb, 'get_content_calendar' plus 'Read-only' signal a retrieval operation for the calendar, source drafts, Feed state, and X production switch. It names a concrete resource and is not a tautology, but it does not contrast with sibling getters such as get_snapshot or list_feed.

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?

There is no explicit when-to-use statement or alternative routing; the guidance is limited to the read-only warning and the caveat to check linkage/calendar_sync instead of treating saved words as publication proof. This implies a read-only inspection use case but leaves selection among sibling getters to the agent's inference.

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