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add_free_days

Extend a member's subscription by adding free days to their membership. Specify the membership ID and number of days to grant.

Instructions

Extend a membership by adding free days to it.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
membership_idYesThe membership ID to extend.
daysYesNumber of free days to add.
Behavior2/5

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

With no annotations, the description should disclose side effects or requirements. It only states the action without explaining what happens to the membership (e.g., if already expired, impact on billing) or needed permissions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence with no redundancy, effectively conveying the core action. It is appropriately concise given the tool's simplicity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is too minimal for a mutation tool. No output schema, no annotations, so it should explain expected behavior, side effects, or return value. Currently lacks completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema already describes both parameters (membership_id, days) with 100% coverage. The description adds the term 'free days' but does not clarify semantics beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool extends a membership by adding free days, which is specific. However, it does not differentiate from sibling tools like update_membership, which could also modify membership duration.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives such as update_membership or cancel_membership. The description lacks context on prerequisites or typical use cases.

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

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