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

With annotations covering safety (readOnlyHint, destructiveHint=false, openWorldHint), the description adds real value: it discloses that this is a real Chrome session where the user is signed in, that the user's existing tabs are preserved, and that the call returns the page's visible elements and text with stable numbering. It omits failure behavior (bad URL, browser startup failure) and any session/persistence nuance, keeping it below 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?

The core purpose, sequencing, and return behavior are front-loaded in tight sentences, but the closing sentence enumerating Podium actions (List conversations, Send message, Request payment, etc.) is a long list whose relevance to opening a browser is unclear and which overlaps sibling podium_* tools. That sentence dilutes rather than sharpens the definition.

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 2-parameter tool with no output schema, the description covers the essential ground: what starts, where the URL goes, that the page content comes back, and the ordering relative to other browser tools. Error paths and session lifetime are the notable omissions.

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 is 3, but the description adds routing semantics for `url` — it lands in the site's existing open tab rather than spawning a new one — which the schema's "public http or https address" note does not convey. The `app` parameter is left entirely to the schema, which documents it well, so no penalty.

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 verb and resource — starts the user's Cloud Browser (real Chrome, signed in) and opens `url` — and explicitly positions it against siblings with "Call it first," implying navigation/read/click tools come after. An agent can identify the entry point of the browser toolchain without consulting another schema.

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 clear sequencing guidance and the tab-routing rule (site's open tab, else a new tab) implies when navigating within an already-open session may or may not be needed. It stops short of naming cotlet_browser_navigate as the alternative for later navigation, so it is clear context without explicit exclusions.

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