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

Goes well beyond the annotations: discloses the 429 rate limit of 10 workspaces per 24 hours including web-app usage, the auth requirement (workspaces:write), that the workspace is not team-shared and does not inherit organization Advanced Data Protection, and that organization_id/persona inputs error out. The non-idempotency note is consistent with idempotentHint=false and clarifies the concrete consequence (two identical calls create two workspaces).

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?

Action and usage guidance are front-loaded, and each subsequent sentence carries a distinct operational fact (constraints, non-sharing, non-idempotency, rate limit, follow-up, scope). It is dense with clauses and could be split for readability, but nothing is filler.

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 description covers everything an agent needs: trigger conditions, exclusions, input limits, side effects, quota behavior, required scope, and how to find the created object afterwards.

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 the description's name constraints (trimmed, non-empty, max 120) restate the schema field verbatim. The added note that passing organization_id or persona returns an error is useful but behavioral rather than a clarification of the declared parameter, so this sits at the baseline.

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 new personal workspace owned by the token user') along with the key owning scope. It explicitly separates itself from adjacent operations (rename, share, persona/instructions) that are handled elsewhere, so an agent can distinguish it from update or team-sharing tools in the sibling list.

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 an explicit positive trigger ('when the user asks for a new workspace, for example for a new client') and explicit exclusions ('Do not use it to rename or share one'), naming the correct surface (web app) for those excluded cases. It also names the follow-up tool list_workspaces for verification.

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