add_custom_metadata_field

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

No annotations are provided, and the description does not disclose any behavioral details beyond the action itself. It does not say whether this is a mutating operation, what scope it applies to, or what the effects are on existing metadata.

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 a single sentence, which is appropriately concise. However, the 'Premiere Pro expanded operation:' prefix is redundant and does not earn its place, slightly reducing effectiveness.

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?

The tool has no output schema and no annotations. The description gives only a terse action with no context about when to use it, what happens after execution, or any side effects. This is insufficient for an AI agent to reliably select and invoke the tool.

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 tool has zero parameters, and the schema description coverage is 100% (vacuously, since no parameters exist). Per the rubric, baseline for 0 parameters is 4. The description does not add parameter-level nuance, but there are no parameters to explain.

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 clear action: 'add custom metadata field.' This identifies the verb and resource, distinguishing it somewhat from siblings like set_xmp_metadata or get_metadata. However, it lacks specificity about the context or result, and the prefix 'Premiere Pro expanded operation' adds no unique meaning.

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 on when to use this tool versus alternatives such as set_metadata or attach_custom_property. No conditions, prerequisites, or exclusions are mentioned.

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