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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds only the underlying HTTP endpoint, which does little to reveal behavior such as error handling or the default field set returned.

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 fragments, front-loaded with the resource and scope. The trailing 'GET /api/v6.1/ticket' is implementation detail of marginal value to an agent but costs little.

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 simple two-parameter read tool with a fully documented schema, the definition is mostly sufficient. However, with no output schema present, the agent gets no indication of what a ticket object contains or what the 'default set' of fields is.

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%: the ticket_code parameter documents its source (getfly_list_tickets) and the fields parameter documents the comma-separated syntax and default behavior. The description adds nothing beyond this, 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?

Identifies the resource (a single support ticket) and the lookup key (ticket code), which implicitly distinguishes it from getfly_list_tickets. It lacks an explicit verb ('Retrieve'/'Fetch'), but the intent is unambiguous.

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?

Usage is only implied: you need a ticket_code, and the schema notes it comes from getfly_list_tickets. There is no explicit statement of when to choose this over the list tool or what happens if the code is invalid.

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