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

With no annotations, the description carries the full burden of behavioral disclosure. It explicitly states that data under the token stays and that a wrong or expired key changes nothing, which is valuable non-destructive and failure-mode context for an activation mutation.

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 tight sentences front-load the action and key requirement, then add side-effect guarantees and a pointer to verification. No wasted words or repetition beyond the schema format.

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 one-parameter activation tool with no output schema and no annotations, the description covers the action, key eligibility, non-destructive behavior, failure mode, and how to confirm success. It could add explicit return-value expectations, but license_status confirms it largely covers that gap.

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 fully documents the key parameter, so the baseline is 3. The description adds meaningful semantics by explaining the key must be issued at checkout for this server or bundle and that invalid keys are no-ops, going beyond the schema's simple format description.

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 action, 'Turn Pro on for this connection,' with a clear resource (license/Pro status) and key format. It also distinguishes itself from the sibling license_status by focusing on activation rather than checking status.

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?

It clearly conveys when to use the tool: when activating Pro with a checkout-issued key for this server or bundle. It also references license_status as the follow-up confirmation step, though it stops short of explicitly saying 'use license_status instead to check current status.'

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