Get Garmin training readiness

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint false, so the safety profile is covered. The description adds two useful behavioral facts: the response includes Recovery Time only when Garmin provides it (a conditional field), and the use of 'all' implies multiple snapshots may exist per day. This enriches beyond the annotations without contradicting them.

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 sentences with zero fluff. The main action and resource are front-loaded, and the only extra detail (Recovery Time condition) is appended without distraction. 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?

Given the existence of an output schema (which covers return values), a single required parameter, and comprehensive annotations, the description provides the essential extra context: the date format and the conditional Recovery Time. It doesn't cover pagination or error cases, but those are unlikely to be critical for a single-day snapshot tool. Slight gap: no mention of sibling tool differentiation, but that is more of a usage-guidelines concern.

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 0%, so the description must compensate. It does by specifying the exact format 'YYYY-MM-DD' for the date parameter, which is not in the schema. It also explains the semantic scope of that date (snapshots for that day). This gives the agent the needed parameter understanding beyond the bare 'date' string.

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 and resource: 'Get all Garmin Connect China Training Readiness snapshots for YYYY-MM-DD.' It clearly identifies the scope (Garmin Connect China), the granularity (snapshots for a given date), and distinguishes itself from the morning-only variant by not restricting to morning. No ambiguity.

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?

Provides no explicit guidance on when to use this tool versus the sibling get_morning_training_readiness or other data getters. The description implies it's the all-day snapshot tool, but it never states that, nor does it mention when not to use it. An agent cannot infer the selection criteria without extra reasoning.

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