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

Annotations already declare this is a non-read-only, open-world, idempotent, potentially destructive write, so the safety bar is partly covered. The description usefully adds that it returns a direct comment link, but it says nothing about idempotency keying (requestId), permission requirements, or why the operation is flagged destructive — a notable silence for a mutation tool.

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 action and followed by the two facts an agent most needs (attachment mechanism, return value). No filler, though the extreme terseness leaves the parameter gaps unaddressed.

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 tool with six parameters, four of them required, zero schema descriptions, and no output schema, the description is under-specified — notably leaving the required eventId/participantId/requestId unexplained and omitting any note on idempotency or destructive semantics.

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 description coverage is 0% across 6 parameters, so the description carries the full burden and it only explains one: questionId's discussion-attachment role. eventId, participantId, requestId, body, and agent are left entirely unexplained despite requestId strongly implying an idempotency key.

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 concrete verb+resource pair ('Post a message or answer a question') and clarifies the discussion-attachment behavior via questionId. It clearly implies a write-to-thread operation distinct from siblings like ask_question or decide_question, though it never names those alternatives 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?

Usage is only implied: the reader infers 'use questionId to answer an existing discussion' and 'omit it to post a plain message.' There is no explicit when-to-use/when-not guidance and no routing to sibling tools such as ask_question or vote.

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