Roo — who am I

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

No annotations are provided, so the description carries the full burden — and it does so reasonably: it discloses what the call returns (email, plan, limits, subscription dates) and implies a non-mutating check via 'verify.' It does not state error behavior for an invalid key (e.g., what response shape is returned), which is the main transparency gap, but for a zero-parameter read-only identity check the essential behavior is covered.

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 tight, front-loaded sentences with zero filler: sentence one states function and return content, sentence two states when to use it. Every word earns its place.

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 zero-parameter tool with no output schema and no annotations, the description gives what an agent needs: the operation, the return contents, and the recommended usage context. The only notable omission is the failure mode for an invalid/expired API key and any pagination or detail level of the summary, but the tool still appears callable and interpretable without further information.

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 input schema has zero parameters, so the description correctly adds no parameter noise; per the baseline for 0-param tools this earns a 4. The description does not need to explain any parameter semantics since none exist.

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 names a specific verb ('Verify the Roo API key') and a concrete deliverable ('compact account summary (email, plan, limits, subscription dates)'). The title 'Roo — who am I' reinforces the identity/account-check intent. None of the sibling tools (shortlink, QR, webhook, domain, redirect management) perform account verification, so it is clearly distinguishable without inspecting any schemas.

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?

The description explicitly states when to call it: 'Use to check that Roo access is working before other operations,' positioning it as a smoke test. It does not name alternatives or state when not to use it, but with 13 siblings all doing unrelated shortlink/config/QR operations, no real alternative exists; the guidance is clear though not exhaustive.

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