set_activity_feel

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

Annotations only declare a non-read-only, non-destructive write; the description goes further by disclosing that the backend rejects values outside 0/25/50/75/100 even though Garmin itself can store arbitrary numbers. It also states the clearing semantics for null. It omits auth requirements and whether existing values are returned.

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?

One dense sentence that front-loads the target field and then the constraint, with no filler. The opening 'Partial PUT of summaryDTO.directWorkoutFeel' is implementation jargon that costs readability without adding agent-relevant meaning.

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 two-parameter setter with no output schema, the description covers the value domain, the meaning of the scale, rejection behavior, and how to clear the field. The unresolved null-versus-schema mismatch and the untold activityId semantics are the remaining gaps.

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 50% and the feel parameter is a bare anyOf enum with no description, so the text carries the load: it names the allowed values, labels their meaning (very weak to very strong), and adds clearing behavior. The activityId parameter gets no added semantics, and notably the text claims null is accepted while the schema's anyOf permits only numbers.

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+resource: it sets an activity's workout feel value (summaryDTO.directWorkoutFeel) with the exact allowed scale. The name-plus-field identification makes it distinguishable from most siblings, though it never differentiates from the near-neighbor set_activity_perceived_effort, which an agent must infer.

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 when-to-use, when-not-to-use, or alternative is given. It mentions that null clears the value, which is behavioral rather than routing guidance, and the closest sibling (set_activity_perceived_effort) is not mentioned at all.

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