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

Goes well beyond the annotations by disclosing the AI-attribution marking, the consent requirement, a concrete rate limit (5 messages/hour), an attachment cap with format restriction, and the OAuth account dependency with its failure behavior. Annotations only cover the generic safety profile, so this extra operational context is genuinely additive.

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?

A single compact block that front-loads the core action and the AI-attribution detail before the constraints. Every clause carries information, though the terse fragment "Permission tickets" is slightly cryptic and the rate/attachment/account details crowd into one run-on sentence.

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?

An output schema exists so return values need no explanation, and the description covers the remaining gaps for a mutating, externally visible action: consent, attribution, rate limits, attachment limits, and auth prerequisites. Nothing essential for correct invocation 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 description coverage is 100%, so the parameters are already documented, and the description's attachment constraint (3 plain-text files) merely restates maxItems=3 and the plain-text note. No additional meaning is added about ticket_id format or message semantics beyond 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?

States a specific verb (adds a message) and resource (an existing ticket) plus the crucial scoping detail that the message is sent on the user's behalf and marked "via AI". This clearly distinguishes it from the sibling open_ticket, which creates tickets rather than replying to them.

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 an explicit gating condition: "Use only if the user asks for it or approves it," which is exactly the guidance an agent needs before invoking a tool that acts on someone's behalf. It also notes the account prerequisite, but it never names open_ticket or any alternative, so the routing advice is incomplete.

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