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

Annotations already declare destructiveHint=true, openWorldHint=true, and idempotentHint=false, so safety context is covered. The description adds useful behavioral detail: replies are visible on the real platform, batches are capped at 50, and one result is returned per reply.

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 definition is front-loaded with '[publish]' and packs the entire nested reply shape, platform enum, batch limit, and return behavior into one dense sentence with no wasted text.

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 destructive, open-world send tool with no output schema, the description gives the essential input contract and notes that one result is returned per reply. It stops short of describing result fields or permission/rate-limit requirements, leaving a small gap.

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 0%, so the description carries the full burden and does so well. It defines the replies array elements: platform enum, post_id or post_uuid, comment_id, message, max 50, and the source of ids.

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 public replies to complaint comments' — and names the exact platforms (ig|fb|yt). An agent can distinguish this from comments_collect_complaints and unrelated reply tools without opening the schema.

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 clearly ties usage to ids returned by comments_collect_complaints and marks this as a public publish action. It does not explicitly state when to avoid this tool versus siblings like reply_comment or comments_assign_to_human, but the intended workflow is clear.

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