browser_navigate

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

With no annotations, the description carries the full burden, and it does add one useful trait: it 'waits for page load,' which tells the agent the call is blocking. However, it omits failure behavior (invalid URL, no matching tab), whether it can navigate to non-http schemes, and any permission/extension context.

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?

A single sentence that front-loads the verb and target and includes the one behavioral detail that matters (waiting for load). Nothing is wasted.

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 tool with a fully documented schema and no output schema, the description covers the essentials and the blocking behavior. Only error/failure handling is unaddressed, a minor gap given the tool's simplicity.

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%, so both url and tabId are already documented in the schema. The description's 'specified or active tab' only restates the schema's 'If omitted, navigates the active tab,' adding no format or syntax detail beyond it. Baseline 3 is appropriate.

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 gives a specific verb (navigates) plus resource (a tab in the user's Chrome browser) and the target (a URL), which clearly separates it from siblings like browser_new_tab, browser_click, or browser_evaluate. It does not, however, explicitly contrast itself with those siblings, so it stops short of a 5.

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?

Usage is only implied — the phrase 'specified or active tab' suggests it acts on an existing tab, but the description never says when to prefer this over browser_new_tab or how it relates to browser_select_tab. No exclusions or alternatives are named.

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