deactivate_subscription

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states the action is a deactivation but doesn't reveal whether this is reversible, what permissions are needed, whether it triggers notifications or billing changes, or what happens to associated resources. For a subscription management tool with potential billing implications, this lack of behavioral context is a significant 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, clear sentence that states exactly what the tool does with zero wasted words. It's front-loaded with the core action and target, making it immediately scannable. Every word earns its place by specifying 'deactivate', 'your current subscription', and 'on this device' to provide complete context in minimal space.

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 zero-parameter tool with no output schema, the description provides adequate basic context about what the tool does. However, as a subscription management operation with potential billing or access implications, it should ideally disclose more about behavioral consequences, reversibility, or typical use cases. The description meets minimum viability but leaves important contextual questions unanswered given the tool's likely significance.

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 tool has zero parameters with 100% schema description coverage, so the schema already fully documents the parameter situation. The description appropriately doesn't waste space discussing nonexistent parameters. It implies the tool operates on the current subscription for the current device contextually, which adds useful semantic context beyond the empty 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?

The description clearly states the action ('deactivate') and target ('your current subscription on this device'), making the purpose immediately understandable. It doesn't explicitly differentiate from sibling tools like 'activate_subscription' or 'refresh_subscription', but the verb 'deactivate' provides inherent contrast to 'activate'. The description avoids tautology by specifying what gets deactivated rather than just restating the tool name.

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 description provides no guidance on when to use this tool versus alternatives like 'activate_subscription', 'refresh_subscription', or 'subscription_status'. It doesn't indicate prerequisites (e.g., whether a subscription must be active first), consequences, or typical scenarios for deactivation. The phrase 'on this device' hints at device-specific scope but doesn't clarify if this affects other devices or the overall account subscription.

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