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

Annotations already establish readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds the concrete return shape (counts by status, members), but says nothing about auth requirements, rate limits, or whether the member list is paginated.

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 with no filler; the return contents come first and the usage hint second, which is the right front-loading for a zero-argument tool.

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 return-value burden and does list the payload contents. It stops short of noting whether the member list can be large or how counts are grouped, which a caller might want to know.

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?

Zero parameters, so the schema provides nothing to interpret and the baseline is 4. The description correctly implies the tool is parameterless by scoping it to 'the workspace behind the API key'.

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 (returns) and resource (the workspace behind the API key), and enumerates the payload: campaign counts by status and member list. Implicitly distinguished from the sibling list_workspaces because it takes no scoping arguments and operates on the caller's own key.

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?

Explicitly frames the tool as 'useful as a first call to confirm which workspace a key belongs to', giving a clear use context. It does not name list_workspaces as the alternative when enumerating multiple workspaces, so the routing guidance is incomplete but substantive.

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