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

With annotations already flagging a destructive, open-world write, the description adds important context: public visibility, a required user confirmation, and platform/time restrictions for private DMs. It does not cover permissions, rate limits, or response behavior.

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?

A single front-loaded sentence with no wasted text; the public action comes first and the private-mode caveats and confirmation warning follow compactly.

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 moderate, destructive comment-action tool, the description covers the main behavioral risks and private-mode constraints, and the schema supplies idempotency/account details. Some gaps remain around return/result behavior and required parameter meaning, but the definition is broadly sufficient.

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 50%, and the description adds meaning mainly for private mode (DM behavior, platform limits, 7-day window), while the required postId, commentId, and message parameters remain undocumented. This is adequate but leaves key invocation semantics to the schema/name inference.

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 gives a specific verb/resource ('Reply ... to a comment') and distinguishes the public reply from a private DM to the author. It is clear, though it does not explicitly contrast with adjacent tools such as reply_to_mention or send_message.

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 states the primary usage and private-mode conditions, including Instagram/Facebook-only and the 7-day window, plus the requirement to confirm before public-facing action. It lacks explicit alternatives or when-not-to-use guidance.

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