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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful behavior: the response distinguishes a published message from the caller's own moderation state and can surface a rejection reason. It still omits what happens for a nonexistent id, a post the caller can't see, or which id namespace is used.

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?

It is short with no filler, but it is an unterminated sentence fragment that leads with the return value instead of the action, so it is under-specified rather than efficiently front-loaded. One added clause naming the resource and verb would cost nothing.

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 parameter, full schema coverage, no output schema, and annotations carrying the safety profile, the description is close to sufficient, and it does explain the return shape in lieu of an output schema. It remains incomplete on visibility/permission behavior and on routing versus sibling retrieval tools.

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 100% for the single required parameter, so the baseline is 3. The description adds no syntax, format, or source detail for the id beyond what the schema's 'The post id' already provides; the 'for your own' qualifier is behavioral, not parametric.

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 is a noun phrase describing the payload (published message, or moderation status with the enumerated states and rejection reason) rather than stating a verb+resource; the verb 'Get' only appears in the title. An agent can infer it retrieves a post by id, but it does nothing to separate it from siblings like check_message, browse_posts, or search_posts.

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?

There is no when-to-use guidance and no mention of the obvious alternatives (check_message, browse_posts, search_posts) that an agent must choose between. The only contextual hint is the phrase 'for your own', which implies an ownership-dependent result but is not framed as a selection criterion.

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