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

Annotations already flag destructiveHint=true and openWorldHint=true, and the description adds substantial context beyond them: the preview-first flow that posts nothing on the first call, the token handshake, and the concrete time constraint (UTC ISO-8601, at least ten minutes ahead). This is exactly the kind of behavioral detail an agent needs to avoid an accidental publish.

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?

Three sentences with no waste; the scope constraint is front-loaded and the two-step confirmation flow follows immediately. Every sentence carries an actionable instruction.

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 covers the important return behavior by stating the first call returns a preview and a token. Combined with annotations covering the safety profile, an agent has everything needed to invoke this 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 coverage is 100%, so the baseline is 3. The description still adds value by explaining the semantics of confirmation_token as a call-pattern switch (absent = preview only, present = commit) and reiterating the scheduled_for constraint, which is more than restating the schema field text.

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 a specific verb and resource ('Add a post to the user's scheduled queue') plus the outcome ('publish unattended at a time they choose'), which clearly distinguishes it from an immediate-publish tool. It does not explicitly name the closest sibling (publish_post), so the differentiation is implied rather than stated.

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?

Gives an explicit two-phase invocation protocol: call once without confirmation_token, then again with the token only after user consent. That is clear when-to-use guidance, but it never names the alternative tool (e.g., publish_post for immediate posting) or states when not to schedule.

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