set_player_options

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 PATCH-style merge semantics (omitted fields are left untouched), which prevents an agent from zeroing out settings it did not intend to change. It says nothing about scope (current session vs. persisted preference), required playback state, error behavior, or return value.

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?

Two sentences, both load-bearing: the first specifies the fields and a constraint, the second states the partial-update rule. Scope and fields are front-loaded with no filler.

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 three-optional-parameter setter with no output schema, the description covers the essential call contract. It omits preconditions and the effect surface (does volume apply to the current playback session or persist?), which an agent would want before invoking.

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%, yet the description documents all three parameters by name and adds the volume range 0-100, which the schema does not express. Shuffle on/off and the repeat mode's three states are conveyed, though the concrete repeat values (off/one/all) are left to the schema enum.

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?

Names a specific verb (set) and enumerates exactly what gets changed: volume, shuffle, repeat. An agent can immediately tell this is a playback-option mutator, distinct from siblings like playback, now_playing or play_track. It stops short of explicitly naming an alternative tool, so it doesn't reach the top of the scale.

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?

"Omit what you don't want to change" gives real partial-invocation guidance, which is the main usage question for a tool whose parameters are all optional. However, it never says when to reach for this versus playback or now_playing, nor whether a player/session must already be active, so usage is only implied.

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