DataSieve service heartbeat (free, public)

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

No annotations are provided, so the description itself must convey safety and side effects. It does not explicitly state that this is a read-only operation, what happens on failure, or what the response looks like. The technical phrasing 'Scanner cursor lag vs chain head' hints at a metric but leaves the behavioral implications unclear.

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, well-structured sentence with no filler. It front-loads the key metric and then states the purpose, making it extremely concise and effective.

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 has no output schema, and the description does not describe what the agent should expect in the response or how to interpret the lag metric. For a health check, this lack of return-value information leaves a significant gap in understanding the tool's behavior.

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 has zero parameters and schema description coverage is 100%. With no parameters to explain, the description cannot add parameter semantics, and the baseline for zero-parameter tools is 4.

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 function: verifying the watcher is alive by comparing scanner cursor lag to chain head. It has a clear verb ('verify') and resource ('watcher'). However, it does not explicitly distinguish from sibling tools like ping_heartbeat, which also sounds like a health check, so it stops short of a 5.

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 phrase 'before you buy' provides a clear and specific usage context: use this tool to confirm the service is healthy before making a purchase. It does not, however, mention when not to use it or reference alternative tools, which would be needed for a 5.

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