Get the last subscriber import

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

Annotations already mark this as read-only, idempotent, and non-destructive. The description adds useful behavioral scoping: it reads only the most recent import and enumerates the reported metrics, giving the agent a clear expectation of the result without duplicating annotation info.

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 compact sentences with zero filler. The core behavior is front-loaded, followed immediately by the return fields and a practical use case.

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?

Despite lacking an output schema, the description enumerates the return content (when it ran, total addresses, added, skipped), which is sufficient for an agent to interpret the result. Combined with only one optional parameter and safe read-only annotations, nothing essential is missing.

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?

Schema description coverage is 100%, so the single optional 'publication' parameter is fully documented in the schema. The description adds no additional parameter semantics, which is acceptable per the baseline for full schema coverage.

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 ('Read') and resource ('result of the most recent subscriber import') and tells the agent exactly which data points are returned. This clearly distinguishes it from sibling subscriber management tools like list_subscribers, export_subscribers, and add_subscriber.

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?

Provides an explicit use case: 'Use it to check whether an import actually landed.' It does not name alternatives or state when not to use it, but the intended trigger is clear and the sibling set contains no competing import-status tool.

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