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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description usefully discloses that results include overnight-low frost alerts, but says nothing about return shape, units, or how far the frost alerts extend within the 7 days.

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 zero filler, and the core output description is front-loaded before the use-case clause. Nothing here could be trimmed without losing content.

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 read-only, single-optional-param tool with no output schema, the description covers the horizon, the notable output feature, and the intended decisions it supports. Only minor gaps remain, such as units and whether frost alerts are per-night or summarized.

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?

Only one optional parameter, and the schema already documents it at 100% coverage ('Garden name; defaults to the user's first garden'). The description adds no format or naming detail beyond that, so the baseline 3 applies.

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 ('7-day forecast for the garden') and adds scope detail beyond the name by naming the frost-alert content. The 7-day horizon implicitly separates it from get_current_conditions, but no sibling is named, so differentiation is left to inference.

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?

Lists three concrete use cases ('planting timing, frost protection, watering plans'), which is better than nothing, but gives no when-not guidance and does not address overlap with lookup_frost_risk or lookup_frost_dates, both of which also serve 'frost protection'.

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