usable-browser-agent-free

browser_navigate

Navigate the current browser tab to a specified URL and wait for the page to finish loading.

Instructions

Navigate the active tab to a URL and wait for it to finish loading.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "url": "<url>"
    },
    "name": "browser_navigate"
  }
}

Input Schema

Name	Required	Description	Default
`url`	Yes	Full URL including https://
`timeout`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.7.0Sep 9, 2026

TDQS

A3.8/5.0

Behavior3/5

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

With no annotations provided, the description carries the full burden. It discloses that the tool navigates the active tab and waits for loading to finish, which covers the core behavior. However, it omits details about timeout handling, error behavior, or what 'finished loading' means (e.g., does it wait for all resources?). These are notable gaps for a navigation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single, direct sentence that is front-loaded with the verb and resource. No unnecessary words or repetition. It efficiently conveys the action and the wait-for-load behavior.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple navigation tool, the description covers the essential action and target, but lacks details on the optional timeout parameter and error conditions. Since there is no output schema or annotations, the description is the only source of behavioral context; it is adequate for basic usage but not fully complete for edge cases.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 50%: only 'url' has a description, and 'timeout' is undocumented. The description adds no extra meaning for either parameter; it simply restates the action. It does not explain timeout's purpose, units, or default behavior, which is a significant omission given the schema gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action (navigate), the target (active tab), and the destination (a URL), plus a notable behavioral detail (wait for loading). This distinguishes it from sibling tools like browser_back, browser_forward, browser_reload, and browser_new_tab, which handle different navigation actions.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies the primary use case: navigating the active tab to a specific URL. It does not explicitly mention alternatives or when not to use it, but the context of sibling tools (new_tab, back, forward) makes the scope clear. A short exclusion note would strengthen it, but the intent is evident.

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

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