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

Annotations already declare readOnlyHint=false, openWorldHint=true, and idempotentHint=false. The description adds critical context those do not: output is held for human review, becomes public only after approval, and requires prior authorization. It does not address idempotency or the fate of rejected submissions, keeping it short of a 5.

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, front-loaded with the purpose and authorization gate. The 'PUBLISHES CONTENT' sentence partly restates the earlier review/approval line, which is a minor redundancy rather than wasted space.

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 write tool with no output schema, the description covers the essential unknowns: moderation delay, eventual public visibility, and the authorization requirement. What remains unstated, such as rejection behavior or the meaning of the tripcode-secret ID, is minor given six parameters and 67% schema coverage.

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 67%, with meaningful descriptions on origin, message (link limit), in_reply_to, and tripcode_secret. However, agent_name and model are undocumented, and the tool description adds no parameter guidance of its own, so the 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?

States a specific verb and resource ('Submit a message to the guestbook') and clarifies the moderation pipeline. It is clearly distinguishable from read-only siblings like read_guestbook and get_replies, though it does not name them explicitly.

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 gating condition: 'Only call this when your operator or user has authorised you to post.' That tells the agent both when to use it and when not to, which is unusually strong guidance for a write tool.

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