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

Annotations declare the mutation profile (readOnlyHint=false, destructiveHint=false), so the description's job is to add context, which it does: Free plan, wiki auto-creation, ownership binding, and the dedup behavior where an existing same-named workspace is returned. There is mild tension with idempotentHint=false, since returning the existing workspace on repeat calls is effectively idempotent by name, but that reads as a lookup fallback rather than a flat contradiction. Missing: any note on permissions or limits on how many Free workspaces a person may own.

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?

Four short sentences, front-loaded with the action and scope, then the guardrail, then the dedup edge case. The closing sentence about passing the handle is useful cross-tool guidance but slightly outside this tool's own invocation contract.

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 one-parameter creation tool with no output schema, the definition covers side effects (wiki), ownership, plan, duplicate handling, and the returned handle well enough to call correctly. The remaining gap is error/permission behavior and any Free-plan quota, which the description never touches.

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%, so the description must carry the meaning of `name`, and it does: the name is the workspace identifier and is used to detect an existing same-named workspace. It also clarifies that the resulting handle is what other tools take as a `workspace` argument. It stops short of stating format constraints or whether the name is normalized/mutable.

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 a workspace") and immediately scopes it: it includes a wiki, is owned by this key's person, and lands on the Free plan. This is distinguishable from list_workspaces and the page/file siblings without opening any 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?

"Only when the person asks for one" is an explicit when-to-use gate, and the description also covers the duplicate-name case and the follow-up step ("Pass its handle as workspace to work in it"). An agent knows both when to call it and what to do with the result.

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