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Robot Actions — Remote Device Control

Webpage click

webpage_click

Click an element in the device browser, by CSS selector or by a ref from a page-elements listing — works on BOTH iOS Safari and Android Chrome, auto-detected from the udid. Scrolls the element into view, waits for it to stop moving, and checks it is actually clickable — visible, non-zero-size, enabled, and not covered by anything — retrying until timeoutMs before it gives up. Then taps its center. On iOS the DEVICE taps its own screen at that position, so the page receives a real, fully trusted touch — pointerdown, touchstart, mousedown and click, exactly as from a finger — which also satisfies sites that gate on trusted input. On Android the tap is delivered as a TOUCH through the browser, so elements listening for pointer events respond as well as those listening for click. Falls back to mouse events, then a plain .click(), if a step is unsupported, and the response reports which was used via via. ERRORS rather than reporting success when the element never becomes clickable; pass force:true to skip the checks and dispatch at its coordinates anyway — which works for anything that still occupies a box, but NOT for a display:none or zero-size element, where there is no point to aim at and force fails too. When a selector matches several elements the first VISIBLE one wins, not the first in document order. This is COORDINATE-based. Android events are synthesized by the browser (isTrusted:false); iOS taps are real device input (isTrusted:true) whenever via comes back as "nativeTap".

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
refNoElement ref from a page-elements listing, e.g. "e12". Provide this or `selector`. A ref points straight at the element it was issued for, so it survives markup that shifted position, and it can address elements no CSS selector can reach from the top of the page.
udidYesDevice UDID / serial (iOS or Android)
forceNoSkip the clickability checks and dispatch at the element center regardless (default: false). Use only when the checks are wrong about a target you know is clickable — it restores the old behaviour, where a click on a hidden or covered element reports success without doing anything. Needs a center to aim at, so it still fails on a display:none or zero-size element; it does apply to visibility:hidden, opacity:0, pointer-events:none, disabled, off-viewport, and covered targets.
pageIdNoTarget page/tab id — auto-picked when omitted
socketNoAndroid only: abstract unix socket name (default: chrome_devtools_remote)
selectorNoCSS selector for the target element. Provide this or `ref`.
snapshotNoAppend a webpage_snapshot of the resulting page (actionable elements only) so you can see what the click changed without a second call (default: false)
timeoutMsNoHow long to keep retrying while the element is not yet clickable (default: 5000, max: 30000)
pointerTypeNoHow the tap is delivered. You rarely need this — the default is the best path each platform has (a real device tap on iOS, a browser touch on Android). "touch" is what a finger produces and drives elements that listen for pointer events, which many component libraries bind. On Android a touch also produces mousedown/mouseup unless a handler cancels pointerdown or touchstart — and when one does, click is suppressed too, which is when "mouse" is the way through. "mouse" sends mouse events only, and on iOS it opts OUT of the device tap in favour of the browser-level path, which delivers only mouseup+click and is not trusted. The response reports which was used via `via`.
platformVersionNoIgnored (kept for compatibility)

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed7 schema fields changed
    • addedInput schema / properties / force
      Added value: +{
      +  "description": "Skip the clickability checks and dispatch at the element center regardless (default: false). Use only when the checks are wrong about a target you know is clickable — it restores the old behaviour, where a click on a hidden or covered element reports success without doing anything. Needs a center to aim at, so it still fails on a display:none or zero-size element; it does apply to visibility:hidden, opacity:0, pointer-events:none, disabled, off-viewport, and covered targets.",
      +  "type": "boolean"
      +}
    • addedInput schema / properties / pointerType
      Added value: +{
      +  "description": "How the tap is delivered. You rarely need this — the default is the best path each platform has (a real device tap on iOS, a browser touch on Android). \"touch\" is what a finger produces and drives elements that listen for pointer events, which many component libraries bind. On Android a touch also produces mousedown/mouseup unless a handler cancels pointerdown or touchstart — and when one does, click is suppressed too, which is when \"mouse\" is the way through. \"mouse\" sends mouse events only, and on iOS it opts OUT of the device tap in favour of the browser-level path, which delivers only mouseup+click and is not trusted. The response reports which was used via `via`.",
      +  "enum": [
      +    "touch",
      +    "mouse"
      +  ],
      +  "type": "string"
      +}
    • addedInput schema / properties / ref
      Added value: +{
      +  "description": "Element ref from a page-elements listing, e.g. \"e12\". Provide this or `selector`. A ref points straight at the element it was issued for, so it survives markup that shifted position, and it can address elements no CSS selector can reach from the top of the page.",
      +  "type": "string"
      +}
    • changedInput schema / properties / selector / description
      Previous value: -"CSS selector for the element to click"New value: +"CSS selector for the target element. Provide this or `ref`."
    • addedInput schema / properties / snapshot
      Added value: +{
      +  "description": "Append a webpage_snapshot of the resulting page (actionable elements only) so you can see what the click changed without a second call (default: false)",
      +  "type": "boolean"
      +}
    • addedInput schema / properties / timeoutMs
      Added value: +{
      +  "description": "How long to keep retrying while the element is not yet clickable (default: 5000, max: 30000)",
      +  "maximum": 30000,
      +  "minimum": 0,
      +  "type": "integer"
      +}
    • changedInput schema / required
      Previous value: -[
      -  "udid",
      -  "selector"
      -]New value: +[
      +  "udid"
      +]
  2. First observed

TDQS

A4.5/5.0
Behavior5/5

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

Annotations are sparse (only readOnlyHint=false, destructiveHint=false, openWorldHint=true), so the description carries the real burden and does so richly: scroll-into-view + stability wait + clickability retries until timeoutMs, error-on-failure rather than false success, the trusted-vs-synthesized input distinction (isTrusted true on iOS nativeTap, false on Android), and coordinate-based delivery. This is behavioral context far beyond the annotations.

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 in the opening clause, but the body is a dense wall of prose that overlaps heavily with the schema's pointerType, force, and ref descriptions (the iOS/Android and `via` explanation is effectively stated twice). Every sentence is informative, yet the duplication and length keep it from being tight.

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

Completeness5/5

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

For a complex, high-variance cross-platform interaction with no output schema, the description covers platform differences, failure semantics, fallback chain, and where the outcome is reported (`via`). Nothing an agent needs to call it correctly is missing.

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?

Schema coverage is 100% and the per-parameter descriptions are already very detailed, so baseline is 3. The description still adds semantics not in the schema — notably the first-VISIBLE-element-wins rule when a selector matches several elements, and the retry/timeout interaction — justifying a step above baseline.

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 (click) and resource (element in the device browser) plus the two addressing modes (CSS selector or `ref`), and scopes it to both iOS Safari and Android Chrome. An agent can distinguish this from siblings like device_tap, session_click, webpage_hover, and webpage_scroll_into_view without opening any schema.

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?

Gives concrete when-to-use guidance for the tricky options: pass force:true only when checks are wrong about a known-clickable target, and use pointerType:"mouse" when a handler cancels pointerdown/touchstart. It does not explicitly route the agent away from sibling tools such as device_tap or web_click, so it stops short of naming alternatives.

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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