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

With no annotations provided, the description must carry the full burden of behavioral disclosure. It only states the immediate effect (prevents firing) but does not mention edge cases such as what happens if the switch is already checked in, whether the operation is idempotent, error conditions, or any required permissions. This is a thin description for a mutating operation.

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, concise sentence that immediately conveys the action and purpose. There is no fluff or redundant information, making it easy to scan and understand.

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 one-parameter tool, the description is adequate at conveying the core action. However, it lacks contextual details like expected prerequisites (a previously created dead-man switch) and potential side effects, which would be helpful given there is no output schema or annotations to fill in those gaps.

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 input schema provides 100% coverage for the only parameter 'id' with the description 'dead-man switch id', so the schema already explains the parameter. The tool description adds no additional semantic meaning, so the baseline score of 3 applies.

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 a specific action ('Check in') and resource ('dead-man switch'), and clarifies the purpose ('so it does not fire'). This distinguishes it from sibling tools like create_deadman, which creates a switch, and cancel_resource, which might cancel something else.

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 usage: it should be used to prevent a dead-man switch from firing. However, it does not explicitly state when to use this tool versus alternatives, nor does it mention any exclusions or prerequisites (e.g., the switch must already exist).

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