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

The annotations already declare destructiveHint=true and idempotentHint=false, so the agent knows this mutates state and is not repeat-safe. The description adds that the resulting folder is empty, but never says what happens if the folder already exists (an error, given non-idempotence) or what permissions/root constraints apply, leaving the destructive profile unexplained.

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 core action front-loaded and the caveat immediately after. The uppercase EMPTY earns its emphasis by flagging a behavioral detail in minimal space.

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 mutation tool with a destructive hint, no output schema, and completely undocumented parameters, the description is too thin. It answers the 'do I need this?' question well but leaves the 'how do I call it and what happens on failure?' questions entirely to inference.

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% across three required parameters (id, root, name), so the description carries the full burden and adds nothing — it never explains what 'id' identifies, what 'root' is relative to, or any naming constraints. An agent must guess the meaning of every argument.

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 and resource ("Create an EMPTY folder") with a scope qualifier that rules out a common misconception. It partially differentiates from siblings by naming files.move/files.write/files.writeMany as tools that do not require it, though it doesn't contrast with other creation-adjacent siblings like files.copy or files.uploadUrl.

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?

Explicitly tells the agent when this tool is NOT needed and names the three alternatives that self-create folders, which prevents redundant calls. It stops short of stating the positive case (when a standalone empty folder actually is wanted) and gives no prerequisites or failure conditions.

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