apple_tv_playback

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

Annotations already declare the safety profile (readOnlyHint=false, idempotentHint=false, destructiveHint=false). The description adds no behavioral context beyond the action list; the useful 'toggle/next/previous are not retried' note lives in the schema, not the description, so nothing here enriches the annotation coverage.

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 that names the resource and lists the actions with zero wasted words.

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 explained, and a 1-param tool is inherently simple. But the omission of sibling differentiation (especially versus apple_tv_skip) leaves a real navigational gap for an agent choosing among 14 playback-related tools.

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 enum parameter is fully documented in the schema, so the baseline is 3. The description merely restates the same enum values, adding no syntax, ordering, or semantic detail beyond the schema.

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 ('Control playback') and enumerates the six actions, so an agent knows exactly what it does. However, it does not differentiate from siblings like apple_tv_skip, which overlaps with the 'next'/'previous' actions, leaving ambiguity between tools.

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 lists allowed actions but gives no when-to-use guidance, no conditions selecting this tool over alternatives, and no exclusions. The overlap with apple_tv_skip is left unresolved, so the agent must infer when this tool is appropriate.

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