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

Beyond the annotations (readOnlyHint=false, destructiveHint=true), the description discloses who sees the reply ('visible to project collaborators'), that it is posted immediately, that it is attributed as agent-created, and that later removal cannot undo prior delivery or reading — real context for a destructive write. The no-retry instruction also prevents a common failure loop that annotations cannot express.

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 action and target are front-loaded, then id sourcing, then the failure-handling rule, then visibility and body style — a sensible ordering with almost no filler. It is slightly dense across four sentences, but each one adds a distinct operational constraint.

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?

A destructive write tool with an output schema, so return values need no explanation; the description covers visibility, attribution, irreversibility, and the failure path. The main remaining gap is projectId semantics and any permission/auth requirement for replying in a given project.

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% for all three parameters, so the description must carry the burden. It explains commentId's provenance and how to write body, but projectId is never mentioned, so a third of the parameters remain semantically undocumented.

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 states a specific verb and resource ('Post a reply ... to an open Comment') and names the connected account, which is far more precise than the title alone. It implicitly separates itself from the sibling create_comment by requiring an existing open Comment and a commentId, but never explicitly contrasts the two, leaving that inference to the agent.

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 tells the agent exactly where commentId comes from (a value returned by list_comments or copied from PaperDock) and gives an explicit recovery rule: if the Comment is not found, call list_comments once and do not retry the same missing commentId. It also adds a writing guideline ('natural, collaborator-facing prose'), so the invocation path and message style are both prescribed.

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