add_player

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

With no annotations, the description carries the full burden, and it only says what is created, not how. It does not state what happens with an invalid instrument path, whether the player is appended to an existing flow/setup, what identifier is returned, or whether the operation is reversible.

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 the core action first and examples and lookup hint after. It is tight with no filler, though it would only take a few extra words to make the section flag explicit.

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 two-parameter mutation tool with no annotations and no output schema, the description covers the main input path but leaves important gaps: return value, failure behavior on an unknown instrument, and how solo versus section differs in result.

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 for both parameters. It does explain the instrument parameter well via dotted-path examples and a lookup hint, but the boolean section parameter is only obliquely implied by the parenthetical "(or section)" rather than stated as "set section=true for a section player."

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 ("Add a solo (or section) player holding an instrument") and backs it with concrete instrument path examples such as instrument.strings.violin. It does not distinguish this from the sibling add_instrument, which an agent could reasonably confuse with it, so it falls short of a 5.

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 usefully points at list_library / kInstrumentCollection as the source of valid instrument values, which is real usage guidance for the required parameter. However, it gives no when-to-use versus add_instrument or the other add_* siblings, and no prerequisites or ordering advice.

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