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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety is covered. The description adds a real scoping constraint beyond the annotations ('Only the caller's own tickets are accessible'), which prevents an agent from assuming it can look up another user's ticket. It stops short of pagination or result-size behavior for the list mode.

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?

Three sentences, front-loaded with the two operating modes, then the access constraint, then the workflow rule. Every sentence carries distinct information and none is 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?

Output schema exists, so return values need not be described, and the definition covers both list and single-ticket modes plus the ownership scope. The one meaningful gap is what happens with the list mode at scale (limits or pagination) and how an invalid ticket_id behaves.

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% and the single parameter already documents both interpretations ('read that ticket's thread; omit to list all your tickets'). The description restates the ticket_id mode rather than adding new meaning such as format or invalid-ID behavior, 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?

Names a specific verb and resource ('List the user's Supermetrics support tickets') and explicitly covers the second mode ('read one ticket's thread by ticket_id'). Nothing about it overlaps ambiguously with siblings such as contact_supermetrics, which is named as a distinct action.

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 when-to-use: check before creating a new ticket, and reply with contact_supermetrics if an open ticket already covers the issue. That is a concrete routing decision plus a named alternative, not mere implied usage.

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