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

Annotations already flag non-readonly, non-idempotent, closed-world, so the bar is lower; the description still adds real value by disclosing the precondition (must hold the lease) and the side effect (a handover is deposited for the next cable in its identity package). It stops short of saying what happens on an unauthorized release attempt.

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, front-loaded with the action and followed by the precondition. The parenthetical '(it comes in its identity package)' is terse domain jargon that costs a little clarity but occupies minimal space.

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 one optional, fully-described parameter, no output schema, and annotations covering the safety profile, the description supplies the remaining essentials: the lease-holder precondition and the handover side effect. Error behavior on a failed release is the only notable omission.

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?

Schema coverage is 100% and the single optional parameter is fully documented in-schema, so the baseline applies. The description restates the handover's purpose and audience ('for the next cable') but adds no format or length guidance beyond what the schema supplies.

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 and resource — releasing the line's lease — and adds the scope of what the operation leaves behind (a handover). It implicitly contrasts with line_attach (acquiring) but never names a sibling outright, so differentiation relies on the reader's inference.

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?

"Only the cable that holds the lease can release it" gives a real precondition for use, but there is no explicit when-not guidance and no pointer to line_handover for the case where the agent only wants to update the handover without dropping the lease.

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