sns_unsubscribe

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the action of unsubscribing but does not mention side effects (e.g., the subscription is permanently removed), idempotency behavior, or whether it fails if the subscription does not exist. This lack of extra behavioral context is a gap.

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 a single, concise sentence that conveys the tool's purpose without any wasted words. It is well-structured and appropriately sized for a simple tool with one parameter.

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 tool with one parameter and no output schema, the description minimally satisfies the need to explain what the tool does. However, it lacks any mention of how to obtain the subscription ARN or what happens after unsubscription, which would be useful for completeness given the lack of annotations.

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 schema already provides 100% coverage for the single parameter 'subscriptionArn' with a clear description. The tool description adds no additional meaning beyond what the schema offers, so a baseline score of 3 is appropriate.

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 uses a specific verb ('Unsubscribe') and resource ('an endpoint from an SNS topic'), clearly distinguishing it from sibling tools like sns_subscribe or sns_delete_topic. The inclusion of 'LocalStack' also provides context about the environment, making the tool's function unmistakable.

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 provided on when to use this tool versus alternatives, nor does it mention prerequisites like needing an existing subscription ARN (e.g., from sns_list_subscriptions_by_topic). The description merely states the action without any contextual usage cues.

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