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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, so the safety profile is covered. The description adds the nesting behavior (parent_id creates a child folder), but says nothing about errors, duplicate names, or effects of repeated calls given the non-idempotent hint.

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 short sentences, zero filler, with the primary action front-loaded and the optional nesting detail second. Nothing should be cut or moved.

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?

An output schema exists and all parameters are documented, so the description need not explain returns. For a simple create tool the coverage is nearly sufficient, with only the absence of naming/duplication constraints as a gap.

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 100%, so the schema already defines name, parent_id, and workspace_id, including that null/omitted parent_id means root-level. The description's mention of optional parent_id is essentially a restatement, so baseline 3 is appropriate.

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?

States a specific verb + resource ('Create a folder') and scopes it to a video workspace, which cleanly separates it from update_folder/delete_folder. It never names a sibling, so it falls short of the top band's explicit differentiation.

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?

The create semantics imply when to use it versus update_folder/delete_folder, and it notes parent_id is optional for nesting. There is no explicit when-to-use/when-not guidance or reference to an alternative.

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