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

Beyond the readOnly/idempotent/non-destructive annotations, the description discloses three things structured data cannot: an authorization requirement (admins and owners only), a state condition (works after a trial has ended), and the fact that the actual payment interaction happens outside the tool in the user's browser. It also warns that text under an `untrusted` key is human-authored data, which is essential injection-defense context given there is no output schema.

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 core action and followed by the constraints an agent needs before calling. Every sentence carries distinct, non-redundant information with no repetition of the annotations or schema.

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 single-parameter read tool with rich annotations, this covers everything needed: what it returns, who can call it, when it remains valid, where the sensitive action actually occurs, and how to treat untrusted content in the response. The absent output schema is compensated by the explicit mention of the `untrusted` key.

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 100%, and the single `workspaceId` parameter is fully documented in the schema, including the 'optional when you belong to exactly one workspace' rule. The description adds no additional meaning about the parameter, so the baseline of 3 applies.

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 opens with a specific verb and resource: 'Returns a link to the workspace's Billing page.' It immediately clarifies what the link is for ('Subscribing and entering a card happen on that page, in the person's own browser'), which removes any ambiguity about whether the tool itself handles payment. No sibling tool touches billing, so there is nothing to confuse it with.

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 gives clear usage context: 'Admins and owners only' and 'Still works after a trial has ended', both of which tell an agent when the call will succeed. It does not name an alternative tool or state an explicit 'do not use when' condition, but no sibling overlaps this capability, so the gap is minor.

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