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

Annotations already declare this read-only, idempotent, non-destructive and closed-world; the description adds genuinely new operational facts beyond them — that the call is free and does not start a browser session, so an agent need not treat it as a resource-consuming browser step. It does not describe the shape or length of the returned guidance, which would have completed the picture.

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 instruction and its timing are front-loaded in the first two sentences, which is the right priority for an agent deciding whether to call. The trailing enumeration of ClickSend actions is long and partly redundant with the dedicated clicksend_* sibling tools, keeping it from a 5.

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 guidance tool with no output schema, the description covers trigger timing, scope across catalog and non-catalog apps, cost and session behavior, and the interaction with per-app dedicated tools. The only real gap is what the agent gets back structurally, which the enumerations only partially compensate for.

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 coverage is 100%, so both parameters are already documented with defaults and length limits, making 3 the baseline. The description adds only marginal meaning — the app can be any web app and outside-catalog apps get the generic method — and the enumerated ClickSend actions hint at task phrasing but don't clarify parameter handling.

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 states a concrete resource and result: a step-by-step method for working in an app through Cotlet's Cloud Browser tools, including which browser to use, the sign-in link, screens, menus, actions, notes and any dedicated app tools. That is specific enough to separate it from the neighboring browser primitives (click, navigate, type), which perform actions rather than explain them.

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?

"Call it before the first browser step in an app" gives a clear trigger point, and the note that out-of-catalog apps fall back to the general method sets expectations. There is no explicit when-not-to-use or a named alternative for users who already know the method, but the timing guidance is unambiguous.

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