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Fast Browser MCP

Fast Browser MCP

by kqlio67
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

browser_batch

Execute a sequence of browser actions in one call to cut round-trips and model latency. Automate clicks, forms, extraction, and screenshots in a single request.

Instructions

ULTRA-FAST MULTI-ACTION BATCH EXECUTION: Execute a sequence of browser actions in a single round-trip without model latency. Supports: 'navigate', 'click', 'double_click', 'right_click', 'drag_and_drop', 'mouse_move', 'fill', 'press_key', 'scroll', 'select_option', 'hover', 'wait', 'eval', 'extract', 'snapshot', 'screenshot' (with full_page and clip selector support), 'pdf', 'get_html', 'set_viewport', 'set_user_agent', 'set_headers', 'block_urls', 'set_geolocation', 'set_timezone', 'get_storage', 'clear_cache', 'clear_cookies', 'set_cookie', 'export_traffic', 'console_logs', 'upload_file', 'window', 'system_page', 'extensions', 'extension_action', 'set_download_path', 'grant_permissions', 'system_info'.

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": {
      "steps": "<steps>"
    },
    "name": "browser_batch"
  }
}

Input Schema

NameRequiredDescriptionDefault
stepsYesList of action objects

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.8.0

TDQS

B3.4/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden, yet it only claims speed and enumerates actions. It never states whether steps execute sequentially, what happens on a mid-sequence failure (abort vs continue), whether state persists between steps, or what the tool returns. For a 39-action batch executor these are critical omissions.

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

Conciseness3/5

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

Purpose is front-loaded before the action list, which is content-bearing rather than padding. However, the ALL-CAPS marketing headline ('ULTRA-FAST', 'without model latency') costs space without informing invocation, and the list is delivered as one undifferentiated run-on.

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

Completeness2/5

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

For a tool whose whole value is orchestrating many chained actions, the description omits ordering guarantees, failure/rollback semantics, and return shape, and there is no output schema to compensate. Given no annotations and a 19-field nested step object, this is under-specified for correct invocation.

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

Parameters4/5

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

The schema has no enum on the 'action' field (parameters with enums: 0), so the description's list of 39 valid action strings is genuinely additive vocabulary unavailable in the schema. It also flags 'screenshot' modifiers (full_page, clip selector). It stops short of mapping which step fields (ref/url/selector/text/key) belong to which action, leaving per-step usage to inference.

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?

States a specific verb+resource ('Execute a sequence of browser actions') with an explicit distinguishing scope: one round-trip instead of many. The exhaustive action list makes it unambiguous against every single-action sibling (browser_click, browser_navigate, browser_screenshot, ...).

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

Usage Guidelines3/5

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

The phrase 'in a single round-trip without model latency' implies when to use it (multi-step workflows where per-step round-trips are costly), but no alternative is named and no when-not condition is given. An agent must infer that single actions should use the dedicated sibling tools.

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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