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

Annotations already indicate this is a mutating but non-destructive, idempotent operation. The description adds a meaningful behavioral consequence beyond the annotations: source='measured' resets verification freshness. This helps the agent understand the side effect of choosing that source value.

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 two short sentences with no filler. The main action is front-loaded, and the additional behavioral note is concise and relevant.

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 three-parameter mutating tool with annotations and an output schema, the description covers the essential semantics. The main missing piece is routing guidance against sibling tools, but that gap is already accounted for in usage_guidelines.

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 description adds semantic value for 'source' by explaining the freshness-reset behavior, which is not in the schema. However, 'grinder_id' is left undocumented in both schema and description, and 'setting_label' only gains mild context from the phrase 'collar position'. With 67% schema coverage, the description partially compensates but does not fully cover the gaps.

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 action ('Set') and the resource ('current grinder collar position'), which directly matches the tool name and title. It is specific enough to distinguish from read-oriented siblings like get_dial_state, but it does not explicitly name or differentiate from sibling tools.

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 gives no guidance on when to use this tool versus alternatives, nor does it mention prerequisites or exclusions. The note about source='measured' resetting verification freshness is a behavioral detail, not usage guidance.

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