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

Annotations already indicate readOnly=false, idempotentHint=true, and destructiveHint=false. The description adds a non-obvious behavioral detail: source='measured' resets verification freshness. This is exactly the kind of extra context that helps an agent predict side effects beyond the structured hints.

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?

Two short sentences with no filler. The main action is stated first, and the important behavioral caveat is delivered in the second sentence. Every word earns its place.

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 setter with an output schema and annotations, the description covers the core semantics and an important side effect. The only real gap is usage routing relative to sibling tools, which is captured in the usage_guidelines dimension.

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 description coverage is 67% and includes useful comments for setting_label and source. The description adds value by tying setting_label to the physical 'collar position' and by explaining that source='measured' resets verification freshness, which goes beyond the schema's enum explanation. grinder_id remains implicitly obvious but undocumented.

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 verb and resource: 'Set the current grinder collar position.' This is specific and distinguishes it from most siblings by naming the physical collar position being set. However, it does not explicitly compare itself to related tools like set_active or get_dial_state.

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 provides no guidance on when to use this tool versus alternatives such as get_dial_state or grinder_math. The note about source='measured' is condition-like but it addresses semantics of a parameter, not selection between tools. An agent would have no basis for choosing this tool over a sibling.

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