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

Annotations declare a non-read-only, non-destructive, closed-world write, which is consistent with publishing a story. The description usefully adds the audience ('everyone') and a once-per-cycle convention, which annotations do not convey. It does not disclose what the submission triggers afterward, such as ending the day or a reply.

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 short sentences, front-loaded with the action and followed by the timing constraint; nothing wasted. Brevity is appropriate for a one-parameter tool, though the flavor phrasing costs a little precision.

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 one required parameter, full schema coverage, and no output schema, most of what an agent needs is present. The notable gap is the consequence of calling it — whether it advances or ends the session — which the description hints at only obliquely.

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%, so the single 'story' parameter is already fully documented with a max length in the schema. The description only restates the topic ('about your day'), adding no formatting or length guidance beyond it. 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 conveys the intent — narrating what you did today to the group — but stays in in-world flavor language rather than naming the action precisely. The schema's 'story' field supplies the concrete object, so an agent can infer this submits a short personal report. It does not clearly differentiate from siblings like tell_teacher or pass_note.

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?

'Everyone does this once before going home' gives a usable timing cue and implicitly positions this relative to go_home. It does not state what happens if called twice, whether it must precede go_home, or when not to use it.

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