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

The description adds significant behavioral context beyond annotations: only the token holder can release, without the token the lock expires on its own, and it returns released=false on wrong token or expired lock. This complements the annotations (idempotent, destructive) and gives the agent clear expectations of side effects and failure modes.

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 extremely concise: two sentences, packed with essential information, front-loaded with the primary action. No wasteful wording.

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?

The tool is simple and the description covers the key behaviors: early release, token requirement, expiry fallback, and false return condition. It does not explicitly state the success return value (presumably true), but that is implied. Given the absence of an output schema, this is adequate.

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%, so the schema already fully documents all three parameters. The description adds minimal extra meaning, only referencing the token origin from lock_acquire, which is also in the schema. Baseline 3 is appropriate.

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 function: 'Release a lock early using the token returned by lock_acquire.' It names the specific verb (release), resource (lock), and the token requirement, distinguishing it from siblings like lock_acquire.

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 when to use this tool: when you want to release a lock before its natural expiry. It also explains that the lock expires on its own if not released, providing context. However, it doesn't explicitly compare with alternatives or state when not to use, so it's slightly below a perfect score.

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