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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: it is free and opens no browser session, so calling it has no side effects or resource cost. It also discloses what the response conceptually contains, which matters since there is no output schema, though it does not describe formatting or exhaustiveness of that content.

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 ('Call it before the first browser step in an app') is clear, but it is buried at the end of one very long comma-laden sentence enumerating outputs. Splitting the return-content list from the invocation rule would make it more scannable. Most content earns its place, but the packaging is denser than necessary.

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?

With no output schema, the description carries responsibility for conveying what comes back, and it does list the substantive pieces (browser/sign-in link, method, screens/menus/actions, notes, dedicated tools). Combined with the 'before the first browser step' trigger and the free/no-session disclosure, an agent has enough to decide and call correctly. Remaining gaps are minor formatting/exhaustiveness details.

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% and both parameters are documented in-schema, including a default app of REVIEWS.io, so baseline is 3. The description adds no parameter-level meaning — it does not explain how 'task' shapes the returned method or what happens when 'app' is omitted or unrecognized. The schema does the heavy lifting here.

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 verb+resource framing — a guide explaining how to operate a web app through Cloud Browser with Cotlet's browser tools — and enumerates what it returns (browser choice, sign-in link, step-by-step method, screens/menus/actions, notes, dedicated tools). It implicitly distinguishes itself from the cotlet_browser_* action siblings by positioning itself as the pre-step reference, though it never names those siblings directly. The opening clause is grammatically dense ('How to work in an app by clicking...'), which slightly muddies an otherwise clear purpose.

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 gives a clear trigger: 'Call it before the first browser step in an app,' which tells the agent exactly when in the workflow to invoke it. It also scopes coverage ('Works for any web app; one outside Cotlet's catalog gets the general method') and notes it is free with no browser session, lowering the cost of calling it. It stops short of explicit when-not-to-call guidance or naming an alternative tool for a specific case.

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