dm_comment_private_reply

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

The description discloses several behavioral traits beyond annotations, such as the automatic creation/reuse of chats, the one-reply-per-comment limit, and platform restrictions (Instagram and Facebook Page comments). This adds context to the mutation behavior indicated by readOnlyHint=false.

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 three sentences long, efficiently conveying the action, key constraints, and limitations with no extraneous words. It is front-loaded with the core purpose.

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 no output schema, the description adequately explains inputs and behavior, including the unique reply mechanism and constraints. It does not mention error handling for duplicate replies, but overall it is sufficiently complete for a focused tool.

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?

The input schema covers all four parameters with descriptions (100% coverage). The tool description does not add significant new meaning beyond these, but it does reinforce the platform restriction for profile_id. Baseline of 3 is appropriate.

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 clearly identifies the tool as sending a private DM in reply to a comment, including the unique capabilities of bypassing the 24-hour window and creating/reusing chats. It distinguishes itself from sibling tools like dm_message_send by specifying the context of a comment reply.

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 provides clear context for when to use the tool (replying to a comment via DM), but does not explicitly state when not to use it or mention alternative tools for different scenarios. The constraint of one private reply per comment is helpful.

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