Scroll action, Scroll the page or a scrollable element to browse content. This is the preferred way to scroll on all platforms, including mobile. Supports scrollToBottom/scrollToTop for boundary navigation. Default: direction down, scrollType singleAction, distance null.. Parameters: scrollType? ...
AI agents invoke Scroll to trigger actions in Web Bridge. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
locate | object | — | Describe the target element to be scrolled on, like "the table" or "the list" or "the content area" or "the scrollable area". Do NOT provide a general intent li |
web.url | string | — | URL to open in new tab (omit to use current page) |
distance | number | null | — | The distance in pixels to scroll |
direction | string | — | The direction to scroll. Only effective when scrollType is "singleAction". |
scrollType | string | — | The scroll behavior: "singleAction" for a single scroll action, "scrollToBottom" for scrolling all the way to the bottom by rapidly scrolling 5-10 times (skippi |
web.aiActContext | string | — | Background knowledge passed to aiAct. Default: no extra context. |
web.waitAfterAction | number | — | Wait time in milliseconds after each action execution. Default: 300ms. |
web.replanningCycleLimit | integer | — | Maximum number of replanning cycles for aiAct. Default: model adapter default. |
web.screenshotShrinkFactor | number | — | Screenshot shrink factor before sending images to AI. Default: 1; high values may reduce recognition quality, especially on mobile. |
Parameters from the server's own tool schema.
This tool performs a browser/UI interaction (scrolling) that triggers external operations in a browser context. It's not merely reading data — it actively manipulates the browser viewport state. It belongs to the Execute category as it performs browser automation actions. The blast radius is low since scrolling is non-destructive and reversible, but it can be used to navigate to content that triggers other actions.
From the tool's definition Scroll action, Scroll the page or a scrollable element to browse content... Supports scrollToBottom/scrollToTop for boundary navigation
Risk signalsAccepts URL/endpoint input (web.url) · High parameter count (14 properties)
Attacks that exploit this kind of access
Scroll action, Scroll the page or a scrollable element to browse content. This is the preferred way to scroll on all platforms, including mobile. Supports scrollToBottom/scrollToTop for boundary navigation. Default: direction down, scrollType singleAction, distance null.. Parameters: scrollType? (enum('singleAction', 'scrollToBottom', 'scrollToTop', 'scrollToRight', 'scrollToLeft')) - The scroll behavior: "singleAction" for a single scroll action, "scrollToBottom" for scrolling all the way to the bottom by rapidly scrolling 5-10 times (skipping intermediate content until reaching the bottom), "scrollToTop" for scrolling all the way to the top by rapidly scrolling 5-10 times (skipping intermediate content until reaching the top), "scrollToRight" for scrolling all the way to the right by rapidly scrolling multiple times, "scrollToLeft" for scrolling all the way to the left by rapidly scrolling multiple times; direction? (enum('down', 'up', 'right', 'left')) - The direction to scroll. Only effective when scrollType is "singleAction".; distance? (number) - The distance in pixels to scroll; locate? (object) - Describe the target element to be scrolled on, like "the table" or "the list" or "the content area" or "the scrollable area". Do NOT provide a general intent like "scroll to find some element". It is categorised as a Execute tool in the Web Bridge MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Scroll accepts 9 parameters: locate, web.url, distance, direction, scrollType, web.aiActContext, web.waitAfterAction, web.replanningCycleLimit, web.screenshotShrinkFactor. The full parameter table on this page comes from the server's own tool schema.
Register the Web Bridge MCP server in PolicyLayer and add a rule for Scroll: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Web Bridge. Nothing to install.
Scroll is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the Scroll rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for Scroll. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
Scroll is provided by the Web Bridge MCP server (@midscene/web-bridge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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