Create comment

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

Annotations already establish that this is a non-read-only, non-destructive, open-world operation. The description adds meaningful behavior: immediate publishing when scheduledAt is omitted and threading via parentCommentId.

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 sentences, front-loaded with the main action and followed by the two parameter behaviors that matter. There is no redundant or wasted text.

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?

The description covers the invocation-relevant behavior for a simple create tool, including scheduling and replies, against annotations that already carry the safety profile. It does not describe the return value or permission requirements, which is a minor gap given the lack of an output schema.

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 only 40%, so the description must compensate. It usefully explains the ambiguous optional parameters scheduledAt and parentCommentId beyond their schema text, while postId, accountId, and text are straightforward or partially documented in the schema.

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 states a specific verb and resource: create a comment on a post by the given account. It is clearly distinguishable from siblings such as create_post, update_comment, and reply_to_inbox_item.

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 explicit usage conditions for the optional parameters: omit scheduledAt to publish immediately, and pass parentCommentId to reply to another scheduled comment. It does not name alternatives or exclusions, but the create-vs-update distinction is clear.

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