group_players

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

There are no annotations, so the description must carry the burden. It indicates a state-changing action via 'Group', but does not mention side effects, reversibility, required permissions, or failure conditions. The description is minimally transparent but lacks depth about what changes occur.

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 description is extremely concise, consisting of two short sentences that convey the action, purpose, and parameter meaning without unnecessary words. It is well-structured and front-loads the core verb.

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?

Given the absence of annotations, the description covers the essential context: what the tool does and how to interpret the parameters. It does not mention output or error scenarios, but for a simple grouping operation this is sufficient. The reference to list_players() provides necessary cross-tool context.

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?

The input schema provides no descriptions for the parameters, but the description clarifies that both parameters are player names and specifically that 'followers' are grouped under a 'leader'. This adds semantic meaning beyond the bare schema, though it could be more explicit about the relationship (e.g., leader is the primary player).

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 clearly states the verb 'Group' and the resource 'players', and adds purpose with 'for synchronized multi-room playback', making the tool's intent unmistakable. It also implicitly distinguishes from sibling tools like ungroup_players by describing the grouping 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?

The description explains that 'leader and followers are player names as returned by list_players()', giving direct guidance on how to fill the parameters. It doesn't explicitly state when to use versus alternatives, but the action and context make the appropriate usage clear.

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