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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds non-obvious behavior beyond that: parent folders must exist before nesting, and the tool returns an id whose purpose is chaining into create_endpoint. It does not mention failure modes such as duplicate names, keeping it out of the top band.

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?

Three short sentences: purpose first, then the nesting prerequisite, then the return value's downstream use. Nothing is repeated from the schema or annotations and every sentence earns its place.

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 three-parameter create with no output schema, the description covers what it does, the prerequisite for nesting, and the shape of the useful return value. The only gap is error/duplicate-name behavior, which is minor for a tool of this complexity.

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 coverage is 100%, so the baseline is 3 and every parameter is already documented. The description still adds nesting semantics for parent_folder_id and explains what the return value is used for, going slightly beyond the schema's 'omit for a top-level folder'.

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?

'Create a folder in a workspace' gives a specific verb and resource, and the follow-on sentence about nesting and the returned id makes it unambiguous against siblings like create_endpoint, create_resource, and create_folder's counterpart delete_folder. An agent can select this tool without opening the schema.

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 tells the agent how to obtain a parent id ('create the parent first, or find its id with list_folders') and where the returned id goes (create_endpoint's folder_id), which is real routing guidance. It stops short of stating when not to use this tool, but the context is clear.

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