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

Annotations already declare destructiveHint=true and idempotentHint=false, and the description adds real substance on top: replies by others survive under a deleted placeholder, foreign comments produce an error rather than a silent failure, and calls are gated behind an owner approval step that can be disabled. It stops short of saying whether the deletion is reversible or what the call returns, which is the only remaining behavioral gap.

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 lead sentence and the follow-up 'Deletes something you wrote: ...' restate the same scope twice before reaching new information. The valuable content (placeholder behavior, error case, approval gate) is present but arrives after redundant framing.

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 single-parameter destructive tool with annotations already covering the safety profile, the description covers the critical unknowns: what survives deletion, what fails, and the approval requirement. Only the return value is unexplained, and with no output schema that is a minor omission.

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 100% for the single comment_id parameter, so the schema already carries the description. The description only adds the constraint that the ID must reference the caller's own content, otherwise the error case applies. Baseline 3 is appropriate when the schema does the heavy lifting.

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?

States a specific verb (delete) and three specific resources (comment, Note, Note reply), and explicitly scopes it to content the caller authored. It also distinguishes itself from the sibling remove_comment by naming it alongside the condition that selects it.

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?

Gives both when-to-use and when-not-to-use: someone else's comment errors out, and removing your own comment on your own post should use remove_comment instead. The alternative and its trigger condition are named explicitly rather than left to inference.

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