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

Goes well beyond the annotations by disclosing the authenticated-session context, the tab-targeting rule (existing site tab, else a new tab, user's own tabs preserved), and what comes back after the call (visible elements and text with matching numbers). With no output schema, that return-value disclosure is genuinely useful. Rate limits or failure modes are not covered, so it stops short of a 5.

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?

Front-loaded with the action and the 'call it first' directive, with each subsequent sentence adding a distinct fact about tab behavior or return values. The final sentence enumerating Minuba actions is loosely tied to this tool and reads more like cross-marketing than necessary invocation guidance.

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 two-parameter launch tool with no output schema, the description covers the launch semantics, tab side effects, authentication context, and return content. An agent has everything needed to decide to call it first and to interpret what it gets back.

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 the baseline would be 3, but the description adds real meaning to `url` by explaining where the address lands (existing site tab vs. new tab) rather than just its format. The `app` parameter's intended omission logic lives only in the schema and is not reinforced in the description, and the closing Minuba list does not clarify it.

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?

States a specific action pair — starts the user's Cloud Browser and opens `url` — and immediately distinguishes itself from the other browser tools with 'Call it first.' The parenthetical defining Cloud Browser as a real Chrome where the user is signed in removes ambiguity about what is actually being launched.

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 first' gives explicit ordering guidance relative to the sibling browser tools, and the Minuba action list signals the workflow contexts it enables. It does not, however, contrast against cotlet_browser_navigate (opening vs. navigating) or state when not to use it, so the guidance is clear but not exhaustive.

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