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

Beyond the annotations, the description discloses important behavioral traits: the comment appears under your name, each comment is confirmed by default, confirmation can be switched off for this tool, and the action waits for owner approval. These details materially help an agent understand the interaction flow and approval gate.

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 description is front-loaded and efficient, starting with the core action and then explaining reply behavior and confirmation. The first two sentences overlap somewhat, but the structure remains easy for an agent to parse.

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?

Given four parameters, full schema coverage, and useful annotations, the description is complete enough to invoke the tool correctly. It covers reply behavior, identity, confirmation, and approval, though it does not describe what happens after approval or what response to expect.

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 100%, so all four parameters are already documented. The description reinforces the meaning of parent_comment_id as a reply mechanism, but it adds little beyond what the schema already provides for body, group, and post_id.

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: commenting on a post or replying to a comment. It clearly distinguishes between adding a top-level comment and adding a reply via parent_comment_id, so an agent can tell exactly what the tool does.

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 explains the key conditional behavior: set parent_comment_id to reply under an existing comment, otherwise comment on the post. It also notes default confirmation and owner approval, but it does not name alternative sibling tools or explicitly state when not to use this tool.

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