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

Annotations give readOnlyHint=true, openWorldHint=true, idempotentHint=false, destructiveHint=false, so the safety profile is already covered. The description adds genuinely new behavioral context: it is a real Chrome instance already signed in as the user (no auth step needed by the agent), and only Milanote pages will open, which is a hard runtime constraint an agent must know before calling.

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 is front-loaded ('Starts ... and opens `url`. Call it first.'), but the opening sentence is a dense run of parentheticals that takes effort to parse. The trailing enumeration of nine Milanote actions ('List boards, Add note, Add link ...') is a capability catalog rather than invocation guidance and dilutes the routing message.

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 correctly anticipates the return value ('the elements and text in view, with the same numbers'), which is the detail that makes the tool usable in a follow-up call. Combined with the ordering hint and the Milanote-only constraint, an agent has enough to call it correctly; only the relationship to `cotlet_browser_navigate` is missing.

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. The description earns the extra point by narrowing the parameter's actual domain: the schema advertises 'A public http or https address, e.g. https://example.com', but the description states 'Only Milanote pages open', which contradicts the schema's generic example and is exactly the kind of meaning the schema omits.

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 Milanote Cloud Browser ... and opens `url`'. It also scopes it against the sibling family ('use it for what the Milanote tools do not cover') and against app-level tools. The one gap is that it never distinguishes itself from `cotlet_browser_navigate`, which a reader would reasonably assume also opens a URL.

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 sequencing guidance, and 'use it for what the Milanote tools do not cover' establishes when to reach for the browser rather than a native Milanote tool. There are no when-not-to-use exclusions, and the overlap with `cotlet_browser_navigate` is left unresolved.

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