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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the agent knows it is a safe, non-destructive read. The description adds the specific behavioral trait that it returns a snapshot of many components (installed MCPs, statuses, accounts, counts), which is useful. It does not over-explain or introduce hidden side effects. Given annotations cover the safety profile, this is adequate.

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?

The description is a single sentence that is concise and front-loaded with the key verb ('Returns') and subject ('toolkit state'). Every part of the sentence adds value: it specifies the content and the level of detail. No filler or redundancy.

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?

Given the tool has no parameters, no output schema, and simple annotations, the description sufficiently covers what the tool does and what it returns. It lists the categories of information provided (installed MCPs, statuses, accounts, catalog counts), which is complete for a user to decide whether to call it. Minor gap: it does not specify the format or how the counts are presented, but for a zero-parameter info tool this is not critical.

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 has 0 parameters, and the schema coverage is 100% (vacuous). Since there are no parameters, the description's role is limited, but it compensates by explaining what the output includes. The baseline for 0 params is 4 per the rubric, and the description meaningfully describes the result scope, so it meets that expectation.

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 clearly states the tool's purpose: returning current toolkit state with specific details. It uses a specific verb ('Returns') and resource ('toolkit state'), and lists the contents (installed MCPs, connection status, accounts, catalog tool counts). This distinguishes it from siblings like 'show_version' which likely returns only version info, and 'authenticate' which handles authentication.

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 implies this is for checking the toolkit's current state but does not explicitly state when to use it vs alternatives. Given siblings like 'show_version' may overlap, some guidance on when to call this instead would be valuable. However, the description clearly frames its scope (toolkit state), which helps in selecting it for that purpose.

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