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

With no annotations, the description carries the full burden, and it does disclose one valuable trait: the reply does not alter ticket status, and the action is scoped to "your scope." It is silent on whether the reply notifies the customer, permission requirements, or idempotency/duplicate-reply behavior.

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, no filler, and the primary action is front-loaded ahead of the clarifying exclusion. Every clause earns its place.

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 3-parameter tool with no output schema and no annotations, the description covers purpose and one key behavioral constraint but omits return shape, notification side effects, and permission context. Adequate but with clear gaps an agent would want filled.

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% (ticketId, message, intentId all documented in the schema), so the baseline is 3. The description adds no field-level meaning such as format expectations for the reply text or when intentId should be supplied.

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 ("Add a reply on a support ticket") plus a scope qualifier ("in your scope"). It also explicitly separates itself from the neighboring mutation tool UpdateTicket, so an agent can pick correctly without opening a 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?

Gives one explicit when-not and names the alternative: "Does not change ticket status; use UpdateTicket for that." It lacks guidance on other plausible paths (e.g. how this relates to RecordUserQuestion, whose intentId it consumes), so it is clear context rather than complete routing.

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