create_swim_threshold_workout

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

With no annotations, the description carries the full burden, and it does disclose the key side effect: the workout is uploaded to Garmin Connect, i.e. a remote resource is created. However, it says nothing about auth requirements, whether re-uploading duplicates, or failure behavior for a mutation tool.

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?

Front-loaded with the action and the use case in two short sentences, then a structured Args list. The Args block largely restates schema fields but is justified by the 0% schema description coverage; no filler sentences.

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 all 7 parameters are covered. For an unannotated mutation tool the remaining gap is error/auth/idempotency behavior, but the creation-and-upload semantics are clear enough to call it correctly.

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 0%, so the description must compensate, and it documents all 7 parameters with meaning plus format guidance ('pace as "M:SS/100m"', name example 'CSS Test 800m'). This substantially exceeds what the bare schema titles provide, though it doesn't explain unit/validity constraints for pool_length or stroke values.

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: 'Create a single threshold swim set and upload it to Garmin Connect,' with the scope narrowed by 'single' and 'one continuous threshold block after warmup.' This implicitly separates it from create_swim_endurance_workout, create_swim_intervals_workout, and create_swim_drills_workout, though it never names those siblings explicitly.

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?

'Good for CSS testing' gives an intended use case, which is more than nothing, but there is no explicit when-to-use/when-not guidance and no routing to the endurance, intervals, or drills swim-workout siblings. Usage is implied rather than stated.

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