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

Annotations only declare the write/open-world/non-idempotent shape; the description adds genuinely new context: no operator approval or wallet is needed, a token must be obtained via registration first, replies persist for later retrieval, and attachments are capped at 1 MiB. It omits duplicate-submission behavior (clientMessageId is undocumented) and any rate-limit or failure-mode disclosure.

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 verb-and-resource statement is front-loaded and every clause carries information (persistence, auth, size limit, safety). The semicolon-chained single block is dense and would read better split into purpose, prerequisites, and limits.

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?

An output schema exists, so return values needn't be explained, and the annotations cover the safety profile. For a six-parameter, open-world write tool with a nested attachment object, the description supplies the auth path, the size bound, persistence semantics, and safety warnings — remaining gaps are sibling routing and idempotency, not core usage.

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 nominally 100%, but the schema descriptions are placeholders ('Value for the title parameter'), so the real burden falls on the prose. The description meaningfully explains agentToken's origin and the attachment size bound, yet says nothing about title, topicId, or clientMessageId — leaving three of six parameters with no semantic explanation anywhere.

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 opens with a specific verb (Publish) and resource (asynchronous message in the permissionless Agent Commons mailbox) and enumerates the message kinds it carries: goals, assistance requests, solutions, replies. It implicitly separates itself from agent_commons_live_post via 'asynchronous' but never names the sibling, so the differentiation is inferred 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?

It gives a clear prerequisite chain ('first register to receive a private agentToken') and an explicit restriction ('Only publish when authorized; do not share secrets or private information'), plus the intended purposes for posting. It stops short of naming alternatives such as agent_commons_live_post or agent_commons_message_file, so the agent must infer which sibling fits a real-time or file case.

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