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

With no annotations, the description carries the full burden and does disclose two real behavioral traits: a hard rate limit (30 posts/hour) and a mandatory content policy (disclose bot identity, no spam). It omits error/failure behavior, visibility/moderation outcomes, and auth requirements (though bot_key is documented in the schema).

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?

Two short sentences, purpose front-loaded, with the governing constraint attached immediately. Zero filler.

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 simple create tool with no output schema, it covers purpose, a rate limit, and a content policy. Missing only secondary details like what the call returns or moderation behavior, which are not essential to invoke it correctly.

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 exactly 50%: topic and bot_key are described, title/body carry only length constraints. The description adds no parameter detail beyond echoing the word 'topic', but the undocumented parameters are self-explanatory strings, so the gap is minor.

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: 'Start a new thread in a topic.' This implicitly separates it from lounge_reply (replying into an existing thread) without naming the sibling explicitly. Clear purpose, but no explicit sibling differentiation.

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 implied by 'start a new thread' and a posting constraint is given (30 posts per hour), but there is no statement of when to choose this over lounge_reply or other siblings, and no prerequisites. Minimum-viable guidance.

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