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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description reinforces the scope ('GET ONLY' a single field) and characterizes the domain content, but adds nothing about auth/permission requirements or what happens if the field is unset. Adequate, not rich.

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?

The scoping constraint is front-loaded in the first clause, and the remaining sentences are compact. The middle domain-detail sentence ('Defines participation rules, shared progress...') leans slightly toward flavor over instruction, but it is not wasted space.

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?

With no output schema, the description must convey what comes back; it sketches the returned configuration (participation rules, shared progress, contribution tracking, tiered rewards) rather than leaving the return opaque. It does not describe the field's structure or shape, which is the remaining gap for a read tool.

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% for the single title_id parameter, so the schema already carries the semantics. The description adds no format, source, or validation detail beyond what the schema provides; 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?

States a precise verb and resource ('GET ONLY the CoopEvent field of TitlePublicConfigurationModel') and explicitly contrasts itself with TimedEvent (solo) and Leaderboard (pure ranking), which are actual siblings in the tool list. An agent can select this tool without opening any 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 clear context for when this tool is the right one ('guild raids, server-wide goals, leaderboard tournaments where players contribute together') and names the two adjacent concepts it is not. It stops short of an explicit directive like 'use get_timed_event for solo events', but the differentiation is unambiguous.

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