subscription_plan_availabilities_get_instance

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

The HTTP GET method implies a read-only operation, which is some signal. However, with no annotations, the description fails to disclose return format, permissions, error behavior, or any details about the resource itself.

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 description is very short but redundantly duplicates the same endpoint twice. It is concise yet fails to use that brevity to convey any useful information, making it structurally weak rather than efficient.

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?

The tool has five parameters, no output schema, and no annotations, so the description carries the full burden of explaining the resource, behavior, and usage. It provides nothing beyond the raw endpoint, leaving the agent unable to understand what is being fetched.

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?

The input schema has 100% description coverage for all five parameters, so the schema already documents their meaning. The description adds nothing beyond the endpoint signature, which is acceptable given the schema baseline.

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?

The description simply repeats the HTTP endpoint and resource path, essentially restating the tool name. It does not explain what a 'subscriptionPlanAvailability' is or how this differs from sibling tools beyond the literal path.

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 guidance is given about when to use this tool, what it retrieves, or what alternatives exist. The agent is left to infer everything from the name and schema.

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