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

Annotations already declare the write profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), so the agent knows this mutates state and is not idempotent. The description adds the cross-tool upload dependency, which is genuinely useful, but says nothing about notification side effects, permissions, or what a repeat call produces beyond what idempotentHint implies.

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?

Two sentences, both load-bearing: the first declares the action, the second handles the one non-obvious parameter. Purpose is front-loaded with zero filler.

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?

There is no output schema, so the agent is not told what a successful call returns (e.g. a comment ID) or how errors surface. For a write tool with annotation coverage and a fully described schema, the description is serviceable but leaves the response contract unstated.

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 100%, so all five parameters are documented in the schema itself. The description's note about attachment_file_ids largely restates the schema's '(from files.upload)' hint and says nothing about agent_id or in_workspace, so baseline 3 applies.

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 and resource ('Post a comment on a task'), which is unambiguous. No sibling tool also posts comments on tasks, so disambiguation is implicit rather than stated, but the action is immediately clear.

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?

Provides a concrete prerequisite workflow for the optional attachment path: upload via files.upload first, then pass the returned IDs. It does not state when to prefer this over other task tools, but there is no competing sibling, so the guidance is adequate.

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