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

Beyond the annotations, it discloses the 60-second expiry, single-live-connection cap, 64-ticket coexistence limit, compaction behavior, and the fact that upstream credentials are never disclosed. This richly characterizes the tool's side effects and constraints without contradicting any annotation.

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 purpose is front-loaded in the first sentence, followed by tight constraints and one usage rule; every sentence carries distinct information and there is no filler.

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 two-parameter tool with an output schema and rich annotations, the description covers the important quotas, expiry, and transport-security behavior. It may leave error states or the precise meaning of a 'ready lease' implicit, but it is fundamentally complete for correct invocation.

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 schema has zero prose descriptions for session_id or idempotency_key, and the description never explains their meaning or how they interact with the minting/lease flow. The bearer-transport instruction is useful but does not compensate for the undocumented parameters.

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 first sentence names an exact action and artifact: 'Return one single-use Ausca CDP relay URL for a ready lease.' This clearly distinguishes it from sibling status/close tools, which concern checking or terminating sessions rather than minting a connection.

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 clearly frames the tool's role—'for a ready lease'—and gives concrete invocation guidance: put the lease bearer on the transport, never in tool arguments. It does not explicitly name alternative tools or exclusion conditions, but the context is unambiguous for an agent selecting a connect operation.

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