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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered externally. The description adds ordering ('most recent first') and the shape of each row, which is modest added context, but nothing about pagination limits or permissions beyond what the schema/annotations give.

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 sentences, zero filler: the first front-loads what is returned and in what order, the second gives the queries it answers. Every clause earns its place.

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 not be re-explained, and the annotations fully cover the read-only safety profile. The description supplies the team scope, ordering and use cases, leaving nothing an agent needs to decide to call it.

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 'limit' parameter is documented there with range and default, so the schema carries the burden. The description's 'most recent first' merely confirms the ordering the schema already implies and adds no new parameter meaning. Baseline 3 is correct.

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 (List) and resource (Fun Friday sessions) and immediately scopes it to 'this team... recently, most recent first', which separates it from the singular funfriday_get_session and from funfriday_get_leaderboard. It also enumerates the returned content (game, when, participant count, winner), so an agent knows exactly what it gets.

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 concrete trigger queries ('when did we last do a Fun Friday?') and a use case (summarise the last few weeks), which is clear context for when to reach for it. It stops short of naming alternatives or exclusions, e.g. when to prefer funfriday_get_session or the leaderboard instead.

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