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

Annotations already declare readOnlyHint=true, idempotentHint=true and non-destructive behavior, so the safety bar is lower, yet the description adds the crucial fact that this returns step-by-step instructions (screens, buttons, fields) and performs no action itself. That prevents a common agent mistake of assuming the call completes a sale. It omits any note on instruction staleness or failure modes.

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 core behavior and the handoff to the browser tools are front-loaded, and no sentence repeats the annotations. The trailing sentence about the ProSolutions Paired API and the absence of a self-serve API key is loosely connected and slightly rambling, costing a point on tightness.

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, non-mutating helper with no output schema, the definition covers what the tool returns and what must be done next. The API-key aside adds useful background on why browser automation is required. Only minor gaps remain around what happens if the requested sale cannot be performed.

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 takes no parameters, so the baseline is 4 and there is nothing for the description to disambiguate. It does not misdescribe any input, which is the main risk for a zero-argument tool.

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 names a specific verb and resource — 'Sell service series in the user's own Paired Plus account' — which cleanly separates it from siblings like paired_plus_redeem_service_series and paired_plus_configure_service_series. It does not explicitly name those siblings, but the action verb alone makes the tool's role unambiguous.

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 states clearly that the tool is a guidance step that 'opens nothing by itself' and tells the agent to complete the action with the cotlet_browser_* tools in the Paired Plus Cloud Browser. That is a concrete when/how-to-use instruction. It stops short of naming the sibling series tools (redeem/configure) and when to prefer them over this one.

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