netease_play_result

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

Adds meaningful behavior beyond the annotations: it refuses changed/stale rows and clarifies that success only means the UI shows the chosen title/artist playing, not audible output. This is useful context that readOnlyHint and destructiveHint do not convey.

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?

Three sentences with no filler. The core action is front-loaded, and every sentence adds necessary information such as preconditions, stale-row behavior, and the success caveat.

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?

Covers purpose, stale-row behavior, and the success caveat, and an output schema exists so return values needn't be described. It lacks only an explicit pointer to where the token/index originate and how to route generic playback requests to netease_set_playback.

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, but it only restates 'token and string index' without detailing that searchToken comes from netease_search responses or how index maps to row position. It provides some meaning but leaves parameter semantics mostly to schema names and format.

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: 'Play an exact row from the latest search.' The exact-row/latest-search qualifier distinguishes it from generic playback (netease_set_playback) and search (netease_search), so an agent can infer what this tool is for.

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?

It clearly sets preconditions: requires a search token and string index, and only works on the latest search by refusing changed/stale rows. It does not explicitly name when-not-to-use or alternatives, but the intended context is evident.

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