deadman_checkin

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

No annotations and no output schema, so the description carries the full burden and does not meet it. It never states what happens when the timer expires, whether the reset is idempotent, whether authentication is required, or what the call returns — the consequences of the switch firing are the core behavioral fact and they are absent.

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?

A single tight sentence with no filler and the action front-loaded. It is efficient, though the brevity comes at the cost of the missing behavioral detail noted elsewhere.

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 zero-parameter mutation tool the description is minimally adequate: the agent knows what calling it does at a high level. It is incomplete regarding expiry consequences and the relationship to deadman_status, which an agent would reasonably need before wiring this into a heartbeat routine.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline for a parameterless tool applies. No parameter claims are made that could mislead.

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 ('check in') and the resource it acts on ('dead man's switch timer'), so the agent knows this resets a timer. It does not differentiate from the sibling deadman_status, leaving the read-vs-reset distinction to the tool names alone.

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?

No guidance on when to call it: no check-in cadence, no deadline semantics, and no mention of the sibling deadman_status for inspecting state first. The agent must infer usage entirely from the phrase 'dead man's switch'.

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