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

Annotations already signal a write operation via readOnlyHint=false, but the description adds important nuances: anonymous creation is possible without a token, and anonymous threads can never be edited. It also warns users to include a token if they may update the thread later.

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 first sentence states the core action and target, followed by use cases and an important anonymous-editing caveat. The parenthetical about corrections is detailed but arguably necessary for content quality; overall it is efficient and well-organized.

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 creation tool with two required params and no output schema, the description covers the essential decision factors: what to post, how to identify the board, and whether a token is needed. It does not explain the return value or thread ID, but that is less critical for a create action.

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 only 40%, so the description must compensate. It clarifies the board parameter's accepted formats and explains token semantics well. However, title and body are not explicitly described beyond their names, and the content guidance is embedded in use-case prose rather than mapped to parameters.

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 'Start a new comment thread on a board,' naming a clear verb, resource, and supported target formats. This differentiates it from siblings like reply (comment in an existing thread), edit (modify an existing thread), and delete.

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?

The description gives concrete when-to-use scenarios: posting a task, a correction for a broken page, or a note on page usefulness. It references editing later with the outcome, which implicitly distinguishes it from one-shot posts, though it does not explicitly state 'use reply for existing threads.'

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