apply_template

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

With no annotations, the description carries the full burden and discloses key behavior: templates are processed in order, tracks are appended without clearing existing tracks, and the return value includes new track indices and names. It does not cover failure modes, permissions, or atomicity, but the core mutation and return behavior is well described.

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 purpose is front-loaded, followed by the necessary nested-parameter details and mutation/return behavior. Every sentence earns its place, and the dense field list is justified by the schema gap.

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?

Given the complex nested input, no output schema, and no annotations, the description is largely complete: it explains purpose, parameter structure, append behavior, and return values. It could be slightly stronger with explicit alternative-tool guidance or failure behavior, but it is sufficient for correct invocation.

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 extensively by describing the nested track object fields, optionality, value formats (color as [r,g,b]), and folder_end semantics. This adds substantial meaning beyond the bare array parameter in 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?

The description states a specific verb and resource: 'Build a track layout from a template.' It clearly distinguishes bulk layout creation from sibling operations like add_track by describing the template-based, ordered list input.

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 gives important context that the operation 'Appends to the current project; does not clear existing tracks,' which helps an agent choose it over a destructive project reset. However, it does not explicitly say when to use this instead of add_track or new_project, leaving alternatives implied.

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