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

Annotations already establish that this is a non-read-only, idempotent, non-destructive write operation. The description adds meaningful behavioral context beyond that: the five-message-per-seat limit, the 600-character bound, the exact idempotency key reuse rule, and especially the security note that public participant text is untrusted. No contradiction with annotations.

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 front-loaded with the core purpose, then follows with constraints in a logical order. Each sentence adds a distinct operational or safety rule, and there is no filler. The final sentence about quiet participation is a useful normative cue about when not to use the tool.

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?

Given the lack of an output schema, the description covers the essential invocation knowledge: what to publish, required public flag, content safety rules, rate limits, and idempotency behavior. It is slightly incomplete in that participant_token and visit_id are not explicitly explained as the active-seat credentials, and the tool's return value is not described, but the core usage context is strong.

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?

With 0% schema description coverage, the description must compensate. It adds meaning for text (short, 600 chars), public (must be true), idempotency_key (only reuse for identical content), and reply (reply context). However, participant_token, visit_id, and reply_to are left to be inferred from names and the phrase 'active seat', which is only partial compensation for missing schema descriptions.

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 uses a specific verb ('Publish') with a clear resource ('short public thought or reply') and context ('from an active seat'). This clearly distinguishes cafe_say from cafe_read_table, cafe_take_seat, and cafe_leave without needing to open any schemas.

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 description gives clear context for when to use the tool: publishing a public thought or reply from an active seat, with explicit public:true required. It does not explicitly name sibling tools as alternatives, but 'Quiet participation remains welcome' hints that the tool is optional and not required for participation.

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