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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description reinforces this by stating it 'opens nothing by itself'. It adds useful context on what the return value looks like: step-by-step screens, buttons, and fields. However, it never explains how the tool determines which event or account to generate instructions for, given there are zero input parameters, which is a notable behavioral 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 core content (returns instructions, does not act, use browser tools to execute) is front-loaded and useful. The trailing sentence about Billetto's public API v3 and the absence of an official MCP server is trivia that does not help an agent decide to call or invoke the tool, and the 'checked 23 Oct 2026' detail adds noise.

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, no-output-schema tool whose annotations already cover the safety profile, the description supplies what matters: it returns a human-readable procedure and performs no side effects. The remaining gap is how the target event/account context is resolved without parameters.

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 no input parameters, so the baseline is 4. Nothing in the schema needs explaining, and the description's claim that it 'opens nothing by itself' implicitly confirms no arguments are required. There is no added meaning to provide.

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 makes clear that despite the 'create' name, the tool only returns step-by-step instructions (screens, buttons, fields) and performs no mutation. It distinguishes the tool from the cotlet_browser_* siblings that actually execute the steps. It falls short of 5 because the opening sentence 'Create access code in the user's own Billetto account' initially reads as a write operation before the clarification arrives.

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 prescribes a workflow: call this first to get the procedure, then carry it out with cotlet_browser_* tools in the user's Billetto Cloud Browser. That is actionable sequencing. There is no explicit statement of when not to use it, e.g. for other Billetto resources or when the user already knows the flow.

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