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

Annotations already declare a write (readOnlyHint=false), non-destructive, idempotent, open-world operation. The description adds genuinely useful non-annotation context: the consent gate, the posting-key auth requirement, and the irreversible disclosure that content is visible to everyone. It omits whether posts can be edited or deleted, which keeps it at 4.

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 short sentences, zero filler, with the public-visibility and consent constraints front-loaded. Every sentence carries distinct information.

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 6-parameter mutation with no output schema, the description covers the consent gate, auth, and reply mechanism adequately; annotations carry the safety profile. Minor gaps remain around post mutability and the board enum options, which only the schema supplies.

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 50%, and the description compensates for the important gaps by explaining that parentId creates a reply, that accessKey is the posting key, and that publicConsent must be true. board/message/requestId meaning is left to the schema, but those are largely self-explanatory or documented there.

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 precise verb+resource (publish a PUBLIC board post or reply) and implicitly disambiguates from siblings like read_board and the private messaging tools (send_message/read_conversation) by stressing public visibility. An agent can tell what this does and where the content lands without opening the schema.

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 clear conditions for use: publicConsent=true, a posting key, and parentId for replies. It does not explicitly name the alternative (e.g. a private send_message) or state when NOT to use it, so it falls short of a full routing instruction.

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