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MCP Browser

MCP Browser

by wgarrido
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
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click_and_navigate

Interact with a persistent browser tab via CSS selector: click, type, select, submit, or scroll. Returns the updated page state to support multi-step workflows without bot detection.

Instructions

Interact with a persistent browser tab: click elements, type text, select options, submit forms, or scroll. Requires a tab_id from open_tab. Returns the page state after the action.

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": {
      "tab_id": "<tab_id>",
      "action": "<action>",
      "selector": "<selector>"
    },
    "name": "click_and_navigate"
  }
}

Input Schema

NameRequiredDescriptionDefault
valueNoText to type (for 'type'), option value (for 'select')
actionYesAction to perform
tab_idYesThe persistent tab ID (from open_tab)
timeoutNoTimeout in ms (default: 30000)
selectorYesCSS selector for the target element
wait_afterNoCSS selector to wait for after the action completes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A3.8/5.0
Behavior3/5

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

With no annotations, the description carries the burden of disclosing behavior. It does state that the tool returns the page state after the action, which is useful. However, it does not mention side effects of mutating actions like form submission triggering navigation, clicks that navigate away, or how failures/timeouts behave.

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?

Two sentences with no filler. The action list is front-loaded, followed by the prerequisite and return information. Every sentence earns its place.

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

Completeness4/5

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

For a multi-action tool with 6 parameters and no output schema, the description covers the essential flow: prerequisite tab_id, the range of actions, and the return value. It does not spell out the exact structure of the page-state return or per-action differences, but the rich parameter schema compensates for much of that.

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

Parameters3/5

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

Schema description coverage is 100%, so the baseline is 3. The description adds some value by connecting tab_id to open_tab and summarizing the action enum, but it does not add meaningfully beyond what the schema already documents for selectors, timeout, or wait_after.

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 states a clear verb and resource: interact with a persistent browser tab. It enumerates the supported actions (click, type, select, submit, scroll), which makes what the tool does immediately obvious and distinguishes it from tab-management siblings like open_tab and close_tab.

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 description gives a clear prerequisite: 'Requires a tab_id from open_tab.' This implies when the tool is appropriate, but it does not explicitly contrast it with alternatives such as execute_javascript or fetch_page, nor does it state when not to use this tool. Usage context is present but only implicitly.

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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