create_cycling_interval_workout

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

With no annotations, the description carries the full burden. It usefully discloses that the tool both creates AND uploads to Garmin Connect, and that targets are encoded as power.between (ID 6) so the device shows '250-270W'. It does not cover authentication requirements, rate limits, duplicate-workout behavior, or failure handling on upload — meaningful gaps for an unannotated write 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?

The action is front-loaded in sentence one, followed by a short implementation rationale and a compact Args list. The Args block duplicates defaults already in the schema, but given 0% schema coverage that redundancy is largely justified.

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 not be described, and the parameter list is fully documented. For a mutation tool with no annotations, the only real gap is operational context (auth, upload failure, scheduling follow-up) rather than anything an agent needs to form a correct call.

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% (properties carry only a title), so the description must compensate, and it does: the Args block defines all 8 parameters with units (watts, seconds, minutes), semantics, and defaults that match the schema. This is close to ideal compensation for a zero-coverage schema.

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, and training modality: create a power-based VO2max cycling interval workout and upload it to Garmin Connect. This is clearly distinguishable from siblings like create_cycling_tempo_workout, create_cycling_sweet_spot_workout, and create_cycling_over_under_workout without opening any schema.

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 'VO2max' and 'power-based' framing implies the intended training context, but there is no explicit when-to-use statement, no exclusion criteria, and no named alternative among the many create_*_workout siblings. The note about exact watt targets implies it is the right choice when the athlete wants absolute watts rather than zones, but that inference is left to the agent.

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