add_custom_metadata_field

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says 'add,' implying a mutation, but gives no information about side effects, persistence, reversibility, permissions, or what happens if the field already exists.

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 short but under-specified. The phrase 'Premiere Pro expanded operation' adds no useful meaning, and the rest simply repeats the tool name. This is under-specification rather than effective conciseness.

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?

With no annotations, no output schema, an open-ended input schema, and a one-line near-tautology, the description is completely inadequate for an agent to understand what inputs to provide or what the tool will do. It does not even clarify what a 'custom metadata field' refers to in Premiere Pro.

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?

The input schema declares zero named parameters, so the baseline is 4. The description adds no parameter details, but there are no schema parameters for it to clarify either.

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 'add custom metadata field' is essentially a word-for-word restatement of the tool name, preceded by the boilerplate 'Premiere Pro expanded operation.' It reveals the general action but does not clarify what a 'custom metadata field' is, where it is added, or how it differs from metadata-related siblings like set_xmp_metadata or attach_custom_property.

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?

There is no guidance about when to use this tool versus alternatives. The description offers no context, prerequisites, or exclusions, and the large sibling list includes closely related metadata tools without any differentiation.

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