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

Annotations already indicate readOnlyHint=false (mutation) and destructiveHint=false (non-destructive). The description augments this by noting the side effect of publishing an agent.yield event and explicitly stating that yielding an unheld target is a no-op, which clarifies safety and idempotency beyond the annotations.

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 sentences. The primary action is stated first, followed by a critical safety note, then the side effect. Every clause earns its place with zero 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 simple two-parameter tool with no output schema and annotations covering safety, the description fully equips an agent: what it does, when it's safe, what event it fires, and the no-op edge case. Nothing essential is missing.

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% (both target and subtask have descriptions), so the baseline is 3. The description slightly enhances meaning by implying that 'target' must be one the agent currently holds ('Release a lock you hold'), which is not obvious from the schema alone. It also confirms subtask is optional by mentioning 'claimed' but not elaborating—enough to reinforce the schema.

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?

Description uses the specific verb 'release' with the resource 'lock you hold' and a clear outcome 'so other agents can pick the target up'. It clearly distinguishes from its sibling claim_target, which is the inverse operation, and even names the published event. No ambiguity.

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 gives clear context for when to use it: when you hold a lock on a target and want to release it. It also includes a safety condition (yielding something you don't hold is a harmless no-op) that implicitly warns against misuse. However, it doesn't explicitly name an alternative tool or say 'use claim_target to acquire'—though that is strongly implied by the sibling context and phrasing.

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