Play or pause player

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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the mutation and idempotency profile is covered structurally. The description adds nothing beyond that – no auth/permission requirements, no failure conditions (e.g. empty queue), no note that it targets the channel-wide player rather than a per-user one, which is the one piece of context this tool most needs.

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?

A single front-loaded sentence with no filler; the action and target are stated immediately. It is efficient, though its brevity borders on under-specification for a control operation rather than being optimally informative.

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?

The tool is low-complexity with fully documented parameters and no output schema, so the essentials are present. Still, for a state-changing control tool sharing a namespace with four related songrequest tools, the description leaves the agent without enough to confidently pick it over its siblings or anticipate failure modes.

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 coverage is 100% and the required 'state' parameter carries an enum with a description, so the schema fully documents both parameters. The description adds no syntax or defaulting nuance (e.g. channel fallback to SE_CHANNEL_ID) beyond what the schema already provides, making the baseline 3 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?

The description states a specific verb pair (play/pause) and the resource (the channel's media request player), so an agent knows exactly what action family this belongs to. It does not, however, distinguish itself from nearby siblings such as songrequests_next or songrequests_player_status, which an agent must infer from names alone.

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?

There is no statement of when to use this tool versus alternatives like songrequests_next (skip track) or songrequests_player_status (read state). The agent gets no exclusions, prerequisites, or routing hints despite several closely related siblings existing.

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