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 genuine context beyond that: the created workspace is isolated (its own accounts, posts, schedule) and its slug is the handle other tools need. It says nothing about name uniqueness, failure modes, or rate limits, so it stays at a solid-but-not-rich 3.

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 sentences, no filler, and the core action is front-loaded ahead of the downstream-usage note. Every clause carries information the agent needs.

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?

With no output schema, the description usefully compensates by implying the slug is the returned handle to reuse elsewhere. It is complete for a simple 2-parameter create, though it omits duplicate-name behavior and does not explicitly state what the call returns.

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% and both parameters are already documented (including the UTC default), so the baseline is 3. The description earns above baseline by introducing the slug — an identifier not present in the schema — and telling the agent where it is consumed, which clarifies the output contract of the call.

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 workspace') and scopes it to 'a new brand or client', which immediately distinguishes it from the list/update workspace operations. It also explains what a workspace contains (connected accounts, posts, schedule), so an agent understands the resource it is creating.

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?

Gives a clear trigger ('for a new brand or client') and a forward-looking rule for downstream use ('pass its slug as workspace to the other tools'), which tells the agent when this tool must be called first. It does not, however, mention the alternative list_workspaces or what to do if a workspace for that brand already exists.

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