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

Annotations already mark this as readOnly=false and destructive=true; the description adds meaningful behavioral constraints around Markdown support, attachment source restrictions, idempotent retries, and enforcement of connection write access. No statement contradicts the annotations.

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?

Four sentences, front-loaded with the core purpose, with every sentence adding a practical constraint or workflow note. No filler or redundant restatement of the tool name.

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 write operation with annotations, output schema, and a high-coverage input schema, the description covers the remaining operational essentials: formatting, attachment prerequisites, retry behavior, and auth enforcement. No call-blocking information is missing.

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 high (83%), but the description adds value by explaining Markdown Lite for text, requiring prepared upload references for attachments, and clarifying idempotency_key reuse for retries. These semantics supplement rather than repeat 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 uses a specific verb and resource ('Post a reply to feedback') and clearly indicates a write operation. It does not explicitly distinguish reply_to_comment from siblings like create_comment or update_comment, so it falls short of full differentiation.

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 usage context: attachments must come from prepare_attachment_upload, URLs and local paths are rejected, and idempotency_key should be reused for retries. It names a prerequisite tool and gives exclusions, though it does not explicitly state when to prefer a sibling tool.

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