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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent write. The description adds value beyond that: the ticket must be 'open' (a constraint absent from annotations) and that confirmation is required before writing. It doesn't mention the dry-run/confirm param or idempotency behavior in prose, but the added constraint and confirmation rule justify a 4.

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 short sentences, front-loaded with the core action and followed by the critical confirmation instruction. Every sentence earns its place with zero waste.

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 write tool with full schema coverage and a set of safety annotations, the description covers the key constraints: open-ticket scope and mandatory confirmation. It omits the dry-run/commit semantics of the confirm parameter and any note on return behavior, leaving minor gaps.

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 every parameter (farmId, ticketId, message, confirm, idempotencyKey) is already documented in the schema. The description adds no syntax, format, or value details beyond that, so the 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?

The description states a specific verb and resource ('Add a reply message to an open support ticket'), so the agent knows this is a write operation that posts a message. It does not, however, name the sibling tools it should be distinguished from (e.g. get_ticket_thread, create_support_ticket), so it falls short of full sibling differentiation.

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?

'ALWAYS ask for confirmation before writing' gives a workflow instruction, implying the agent should interact with a user before committing. It gives no explicit when-to-use vs alternatives or prerequisites beyond this, so usage guidance is implied rather than comprehensive.

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