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

Annotations already declare destructiveHint=true and idempotentHint=true; the description adds real value by explaining what 'destructive' means here — the stored position is replaced and no history is retained — plus the side effect of a measured source on verification freshness. It stops short of describing permissions or the response shape.

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?

Three short sentences, front-loaded with the core action, then the consequence of the source value, then the overwrite behavior. No filler, every sentence carries information.

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?

An output schema exists so return values need no explanation, and the description covers the destructive overwrite semantics and the key source side effect. It is nearly complete for a 3-parameter mutation tool, with only minor gaps around permissions and freshness semantics.

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 67%, with source and setting_label documented in the schema. The description adds meaning to source="measured" by tying it to verification freshness, which the schema does not state, but it says nothing about grinder_id and only partially compensates for the coverage gap.

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 states a specific verb and resource — setting the grinder collar position — which separates it from the generic update_grinder sibling. It does not explicitly name or contrast with alternatives, but the scope is unambiguous.

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?

There is no explicit 'use when / don't use when' guidance or named alternative, but the note that source="measured" resets verification freshness implies when a verified entry is warranted versus a guess. Usage is inferable rather than stated.

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