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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: exactly one workspace exists per API key, and the payload includes currency and the key's scope. It stops short of describing the response shape (single object vs. array) or any failure mode for an invalid key.

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?

One short sentence with no filler, and the cardinality constraint '(one per key)' is placed inline where it matters most. It reads as a fragment rather than a complete statement, which slightly weakens front-loading of the action.

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 carries the burden of explaining the return value; it names currency and key scope but not the workspace identifier or other fields, and it never resolves whether the result is a single object or a one-element list. For a zero-parameter read tool this is adequate but leaves the agent guessing at the payload.

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?

The tool takes zero parameters and the schema is empty, so there is nothing for the description to disambiguate. Baseline 4 applies; no parameter meaning is missing.

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 identifies the resource (the workspace tied to the API key) and names two fields it carries (currency, key scope), so the agent knows what it gets back. But it is a noun phrase rather than a verb+resource statement, and it never says 'retrieve' or 'list', leaving the action implicit. It also sits in tension with the 'list_workspaces' name by asserting a single result.

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?

There is no when-to-use guidance, no prerequisites, and no reference to alternatives such as get_overview or get_campaign for workspace-level context. The agent must infer the call site entirely from the resource description.

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