play_songs

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

With no annotations, the description carries the full behavioral burden. It usefully discloses that replace_queue=false appends after the current queue instead, implying the default replaces the queue, but it does not describe failure behavior for unmatched songs or any permission/status side effects. Output schema exists, so return values need not be explained.

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 two compact sentences with the core purpose front-loaded and each sentence adding useful information. There is no redundant or filler text.

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?

For a simple two-parameter playback tool, the definition covers purpose, song format, and queue replacement behavior, and the output schema can carry return details. Some edge-case behavior is missing, but the agent has enough to invoke it correctly.

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 0%, so the description must compensate. It does so for both parameters: songs should be precise searches like 'Artist - Song Title', and replace_queue controls replacement versus appending. This adds clear meaning beyond the schema names.

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 and resource: it plays a hand-picked list of specific songs in order. The phrase 'in order' and 'hand-picked list' distinguishes it from queue-appending and radio-style siblings, though it does not explicitly name alternatives.

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?

Usage is implied by 'hand-picked list' and the replace_queue note, but there is no explicit guidance on when to choose this over similar siblings such as play_search_result, play_favorites, add_to_queue, or start_radio. The replace_queue sentence clarifies a parameter behavior rather than tool-selection guidance.

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