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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description still adds real behavioral context: the creator funds it, existing briefs are not moved, and no invitations are sent. It does not address permissions or failure modes, keeping it short of a 5.

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 tight sentences with the core action front-loaded and no filler. It could be slightly more economical given how little it says about parameters, but nothing is wasted.

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?

No output schema exists, so ideally the description would say what a successful create returns, and it does not. Still, for a two-parameter create whose safety profile is fully covered by annotations, the description gives enough behavioral context to call it correctly.

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% for two required parameters (name, idempotencyKey), and the description says nothing about either. The idempotencyKey especially is non-obvious, and the description provides no syntax or intent guidance to compensate.

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 names a specific verb and resource ('Create ... separate brief library') and clarifies a key semantic distinction (independent of inviting teammates). The term 'brief library' does not match the tool name 'create_workspace', which creates minor terminology friction, but the scope is still understandable.

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?

Calling it 'optional' and independent of teammate invitations implies a usage context (setting up a standalone library rather than sharing into an existing account). However, it never names sibling alternatives like list_workspaces or update_workspace, so when-not-to-use is only implied.

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