desktop-touch-mcp

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scroll

Scrolls windows and pages with five modes: raw wheel, element reveal, smart detection, full-page image capture, or OCR text extraction. Solves out-of-view elements and long-document reading.

Instructions

Purpose: Scroll a window or page. 5 strategies via action: 'raw' (wheel notches), 'to_element' (UIA name/automationId or CSS selector), 'smart' (auto-detect target with multi-strategy fallback), 'capture' (full-page stitched image), 'read' (scroll+OCR+dedupe → stitched text). Details: action='raw': send raw mouse-wheel notches at (x,y) or current cursor, optional window focus. Scroll scale — UIA Tier 1 (ScrollPattern apps): empirically ≈1 text line per notch; amount:3 (default) ≈ 3 lines (small nudge), amount:10 ≈ 10 lines (~½ visible area). Legacy SendInput: each amount unit = 3 wheel ticks; ≈9 text lines per unit at Windows default (app/OS-setting dependent). action='to_element': scroll a named element into viewport (UIA or CDP). action='smart': handles nested scroll layers, virtualised lists, sticky-header occlusion. action='capture': stitches full-page images (caps at ~700KB raw); sizeReduced=true means downscaled. action='read': scrolls page-by-page, OCRs each viewport, deduplicates overlapping lines, returns stitched text; language auto-detected from OS locale if omitted. Prefer: Use action='to_element' or action='smart' for click target out-of-viewport recovery (entity_outside_viewport) — scrolling only helps when the target scrolled out of its own window; if desktop_act reported origin_window_not_visible, restore the window with focus_window and re-run desktop_discover instead. Use action='capture' for reading long pages as images. Use action='read' for extracting text from long native-app documents (PDF readers, text editors, terminals) where copy-paste is unavailable. For simple scroll without target, use action='raw'. Caveats: action='capture' returns stitched image — pixels do NOT match screen coords when sizeReduced=true, use for reading only, not mouse_click. action='smart' CDP path requires browser_open. action='to_element' native path requires element to implement UIA ScrollItemPattern. action='read' uses OCR (imperfect accuracy) and requires the window to be visible; for browser pages prefer browser_eval or browser_overview for accurate DOM text. action='raw' typed errors: code:'ScrollNotDelivered' on silent drop (overlay / non-scrollable / UIPI low-IL); already-at-boundary is success via pre/post-percent disambiguation. hints.verifyDelivery.{channel,reason} per ADR-018 §2.6 (Phase 1b: Tier 1 UIA dispatch for HWNDs exposing ScrollPattern; other apps use legacy SendInput). action='smart' typed errors: code:'OverflowHiddenAncestor' (retry with expandHidden:true), code:'VirtualScrollExhausted' (provide virtualIndex). Examples: scroll({action:'raw', direction:'down', amount:5, windowTitle:'Chrome'}) scroll({action:'to_element', name:'OK', windowTitle:'Dialog'}) scroll({action:'smart', target:'#create-release-btn'}) scroll({action:'capture', windowTitle:'Chrome', maxScrolls:10}) scroll({action:'read', windowTitle:'Acrobat', maxPages:15}) // OCR + dedupe long PDF

Input Schema

TableJSON Schema

Name	Required	Description	Default
`x`	No	X coordinate to scroll at (moves cursor there first)
`y`	No	Y coordinate to scroll at
`hint`	No	Scroll direction hint for binary-search (image path). Seeds lo/hi bounds to reduce attempts.
`hwnd`	No	Direct window handle ID (takes precedence over windowTitle).
`name`	No	Partial name/label of the element (UIA name match). Use for native app elements. At least one of name or selector must be provided.
`port`	No	CDP port for Chrome path (default 9222)
`block`	No	Vertical alignment after scroll — start/center/end/nearest (Chrome path only, default: center)	center
`speed`	No	Cursor movement speed in px/sec (0=teleport, omit=default)
`tabId`	No	Tab ID (Chrome path only). Omit for first page tab.
`action`	Yes	Action selector — one of: raw, to_element, smart, capture, read. Per-action required fields are enforced at call time (see the tool description); this flat schema lists every action's fields as optional.
`amount`	No	Number of scroll notches (default 3). UIA-capable apps (Notepad, Explorer, WPF — Tier 1): empirically ≈1 text line per notch; amount:3 (default) ≈ 3 lines (small nudge), amount:10 ≈ 10 lines (~½ visible area). Legacy apps (SendInput path): each amount unit sends 3 wheel ticks; at Windows default 3 lines/tick that is ≈9 text lines per unit — distance varies by app/OS wheel-speed settings.
`homing`	No	Apply window-movement homing correction to (x,y) before scrolling. Default true.
`inline`	No	Vertical alignment after scroll (CDP path). Default: center.	center
`target`	No	CSS selector (Chrome/Edge) or partial UIA name (native apps). For CDP path, must be a valid CSS selector (starts with #, ., tag, or [ ). For UIA path, a partial name match against element Name property.
`include`	No	Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).
`language`	No	OCR language code (e.g. 'ja', 'en', 'zh'). Omit to auto-detect from Windows system locale via Intl.DateTimeFormat().resolvedOptions().locale. Default: auto.
`maxDepth`	No	Max number of ancestor scroll containers to walk. Default 3.
`maxPages`	No	Maximum number of scroll steps / OCR pages (default 20, max 50).
`maxWidth`	No	Max size of the short edge of the final image (default 1280). For 'down': caps the image width; height is unconstrained. For 'right': caps the image height; width is unconstrained.
`selector`	No	CSS selector for the element (Chrome/Edge only). At least one of name or selector must be provided.
`strategy`	No	auto (default): try CDP → UIA → image in order. cdp: Chrome/Edge only. uia: native Windows UIA. image: image + Win32 binary-search.	auto
`direction`	No	Scroll direction
`scrollKey`	No	Key sent to scroll one page. PageDown (default): full-page scroll for most apps. Space: web/PDF readers. ArrowDown: line-by-line slow scroll.	PageDown
`maxScrolls`	No	Maximum scroll iterations before stopping (default 10, max 30)
`retryCount`	No	Max scroll attempts (image path binary-search). Default 3, cap 4.
`windowTitle`	No	Partial window title. When provided, the server focuses this window first.
`expandHidden`	No	Temporarily set overflow:hidden ancestors to overflow:auto to unlock scroll. Mutates live CSS.
`virtualIndex`	No	Target row index in a virtualised list (0-based). Enables direct TanStack/data-index seeking.
`virtualTotal`	No	Total row count in a virtualised list. Required when virtualIndex is set.
`scrollDelayMs`	No	Milliseconds to wait after each scroll for rendering to settle (default 400). Increase for slow/animated pages.
`verifyWithHash`	No	Verify scroll effectiveness via perceptual hash comparison. Automatically enabled for image path.
`stopWhenNoChange`	No	Stop automatically when two consecutive pages yield no new lines after deduplication (page-end detection). Default true.

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Addedv1.9.2May 25, 2026
Removedv1.8.0May 23, 2026
Addedv1.6.0May 16, 2026
Removedv1.5.1May 12, 2026
Addedv1.5.0May 12, 2026
Removedv1.4.3May 11, 2026
Addedv1.4.2May 10, 2026
Removedv1.4.0May 9, 2026

Changed1 schema field changedv1.2.1May 3, 2026

changedInput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "raw"
-      },
-      "amount": {
-        "default": 3,
-        "description": "Number of scroll steps (default 3)",
-        "type": "integer"
-      },
-      "direction": {
-        "description": "Scroll direction",
-        "enum": [
-          "up",
-          "down",
-          "left",
-          "right"
-        ],
-        "type": "string"
-      },
-      "homing": {
-        "default": true,
-        "description": "Apply window-movement homing correction to (x,y) before scrolling. Default true."
-      },
-      "hwnd": {
-        "description": "Direct window handle ID (takes precedence over windowTitle).",
-        "type": "string"
-      },
-      "speed": {
-        "description": "Cursor movement speed in px/sec (0=teleport, omit=default)",
-        "type": "number"
-      },
-      "windowTitle": {
-        "description": "Partial window title. When provided, the server focuses this window first.",
-        "type": "string"
-      },
-      "x": {
-        "description": "X coordinate to scroll at (moves cursor there first)",
-        "type": "number"
-      },
-      "y": {
-        "description": "Y coordinate to scroll at",
-        "type": "number"
-      }
-    },
-    "required": [
-      "action",
-      "direction"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "to_element"
-      },
-      "block": {
-        "default": "center",
-        "description": "Vertical alignment after scroll — start/center/end/nearest (Chrome path only, default: center)",
-        "enum": [
-          "start",
-          "center",
-          "end",
-          "nearest"
-        ],
-        "type": "string"
-      },
-      "name": {
-        "description": "Partial name/label of the element (UIA name match). Use for native app elements. At least one of name or selector must be provided.",
-        "type": "string"
-      },
-      "port": {
-        "default": 9222,
-        "description": "CDP port for Chrome path (default 9222)",
-        "maximum": 65535,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "selector": {
-        "description": "CSS selector for the element (Chrome/Edge only). At least one of name or selector must be provided.",
-        "type": "string"
-      },
-      "tabId": {
-        "description": "Tab ID (Chrome path only). Omit for first page tab.",
-        "type": "string"
-      },
-      "windowTitle": {
-        "description": "Partial window title (required for native path when name is used)",
-        "type": "string"
-      }
-    },
-    "required": [
-      "action"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "smart"
-      },
-      "direction": {
-        "default": "into-view",
-        "description": "Scroll direction. into-view: scroll until target element is visible (default). Other values scroll unconditionally.",
-        "enum": [
-          "into-view",
-          "up",
-          "down",
-          "left",
-          "right"
-        ],
-        "type": "string"
-      },
-      "expandHidden": {
-        "default": false,
-        "description": "Temporarily set overflow:hidden ancestors to overflow:auto to unlock scroll. Mutates live CSS.",
-        "type": "boolean"
-      },
-      "hint": {
-        "description": "Scroll direction hint for binary-search (image path). Seeds lo/hi bounds to reduce attempts.",
-        "enum": [
-          "above",
-          "below",
-          "left",
-          "right"
-        ],
-        "type": "string"
-      },
-      "inline": {
-        "default": "center",
-        "description": "Vertical alignment after scroll (CDP path). Default: center.",
-        "enum": [
-          "start",
-          "center",
-          "end",
-          "nearest"
-        ],
-        "type": "string"
-      },
-      "maxDepth": {
-        "default": 3,
-        "description": "Max number of ancestor scroll containers to walk. Default 3.",
-        "maximum": 10,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "port": {
-        "default": 9222,
-        "description": "CDP port (default 9222)",
-        "maximum": 65535,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "retryCount": {
-        "default": 3,
-        "description": "Max scroll attempts (image path binary-search). Default 3, cap 4.",
-        "maximum": 4,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "strategy": {
-        "default": "auto",
-        "description": "auto (default): try CDP → UIA → image in order. cdp: Chrome/Edge only. uia: native Windows UIA. image: image + Win32 binary-search.",
-        "enum": [
-          "auto",
-          "cdp",
-          "uia",
-          "image"
-        ],
-        "type": "string"
-      },
-      "tabId": {
-        "description": "CDP tab ID (Chrome path only). Omit for first page tab.",
-        "type": "string"
-      },
-      "target": {
-        "description": "CSS selector (Chrome/Edge) or partial UIA name (native apps). For CDP path, must be a valid CSS selector (starts with #, ., tag, or [ ). For UIA path, a partial name match against element Name property.",
-        "type": "string"
-      },
-      "verifyWithHash": {
-        "default": false,
-        "description": "Verify scroll effectiveness via perceptual hash comparison. Automatically enabled for image path.",
-        "type": "boolean"
-      },
-      "virtualIndex": {
-        "description": "Target row index in a virtualised list (0-based). Enables direct TanStack/data-index seeking.",
-        "minimum": 0,
-        "type": "integer"
-      },
-      "virtualTotal": {
-        "description": "Total row count in a virtualised list. Required when virtualIndex is set.",
-        "minimum": 1,
-        "type": "integer"
-      },
-      "windowTitle": {
-        "description": "Partial window title. Required for UIA and image paths. For CDP path, optional.",
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "target"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "capture"
-      },
-      "direction": {
-        "default": "down",
-        "description": "Scroll direction: 'down' (vertical, uses Page Down key) or 'right' (horizontal, uses mouse scroll). Default 'down'.",
-        "enum": [
-          "down",
-          "right"
-        ],
-        "type": "string"
-      },
-      "maxScrolls": {
-        "default": 10,
-        "description": "Maximum scroll iterations before stopping (default 10, max 30)",
-        "maximum": 30,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "maxWidth": {
-        "default": 1280,
-        "description": "Max size of the short edge of the final image (default 1280). For 'down': caps the image width; height is unconstrained. For 'right': caps the image height; width is unconstrained.",
-        "type": "integer"
-      },
-      "scrollDelayMs": {
-        "default": 400,
-        "description": "Milliseconds to wait after each scroll for rendering to settle (default 400). Increase for slow/animated pages.",
-        "maximum": 3000,
-        "minimum": 100,
-        "type": "integer"
-      },
-      "windowTitle": {
-        "description": "Partial title of the window to capture (case-insensitive match)",
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "windowTitle"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "read"
-      },
-      "language": {
-        "description": "OCR language code (e.g. 'ja', 'en', 'zh'). Omit to auto-detect from Windows system locale via Intl.DateTimeFormat().resolvedOptions().locale. Default: auto.",
-        "type": "string"
-      },
-      "maxPages": {
-        "default": 20,
-        "description": "Maximum number of scroll steps / OCR pages (default 20, max 50).",
-        "maximum": 50,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "scrollDelayMs": {
-        "default": 400,
-        "description": "Milliseconds to wait after each scroll for rendering to settle (default 400).",
-        "maximum": 3000,
-        "minimum": 100,
-        "type": "integer"
-      },
-      "scrollKey": {
-        "default": "PageDown",
-        "description": "Key sent to scroll one page. PageDown (default): full-page scroll for most apps. Space: web/PDF readers. ArrowDown: line-by-line slow scroll.",
-        "enum": [
-          "PageDown",
-          "Space",
-          "ArrowDown"
-        ],
-        "type": "string"
-      },
-      "stopWhenNoChange": {
-        "default": true,
-        "description": "Stop automatically when two consecutive pages yield no new lines after deduplication (page-end detection). Default true.",
-        "type": "boolean"
-      },
-      "windowTitle": {
-        "description": "Partial window title to focus and OCR (case-insensitive match).",
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "windowTitle"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "raw"
+      },
+      "amount": {
+        "default": 3,
+        "description": "Number of scroll steps (default 3)",
+        "type": "integer"
+      },
+      "direction": {
+        "description": "Scroll direction",
+        "enum": [
+          "up",
+          "down",
+          "left",
+          "right"
+        ],
+        "type": "string"
+      },
+      "homing": {
+        "default": true,
+        "description": "Apply window-movement homing correction to (x,y) before scrolling. Default true."
+      },
+      "hwnd": {
+        "description": "Direct window handle ID (takes precedence over windowTitle).",
+        "type": "string"
+      },
+      "include": {
+        "description": "Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "speed": {
+        "description": "Cursor movement speed in px/sec (0=teleport, omit=default)",
+        "type": "number"
+      },
+      "windowTitle": {
+        "description": "Partial window title. When provided, the server focuses this window first.",
+        "type": "string"
+      },
+      "x": {
+        "description": "X coordinate to scroll at (moves cursor there first)",
+        "type": "number"
+      },
+      "y": {
+        "description": "Y coordinate to scroll at",
+        "type": "number"
+      }
+    },
+    "required": [
+      "action",
+      "direction"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "to_element"
+      },
+      "block": {
+        "default": "center",
+        "description": "Vertical alignment after scroll — start/center/end/nearest (Chrome path only, default: center)",
+        "enum": [
+          "start",
+          "center",
+          "end",
+          "nearest"
+        ],
+        "type": "string"
+      },
+      "include": {
+        "description": "Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "name": {
+        "description": "Partial name/label of the element (UIA name match). Use for native app elements. At least one of name or selector must be provided.",
+        "type": "string"
+      },
+      "port": {
+        "default": 9222,
+        "description": "CDP port for Chrome path (default 9222)",
+        "maximum": 65535,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "selector": {
+        "description": "CSS selector for the element (Chrome/Edge only). At least one of name or selector must be provided.",
+        "type": "string"
+      },
+      "tabId": {
+        "description": "Tab ID (Chrome path only). Omit for first page tab.",
+        "type": "string"
+      },
+      "windowTitle": {
+        "description": "Partial window title (required for native path when name is used)",
+        "type": "string"
+      }
+    },
+    "required": [
+      "action"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "smart"
+      },
+      "direction": {
+        "default": "into-view",
+        "description": "Scroll direction. into-view: scroll until target element is visible (default). Other values scroll unconditionally.",
+        "enum": [
+          "into-view",
+          "up",
+          "down",
+          "left",
+          "right"
+        ],
+        "type": "string"
+      },
+      "expandHidden": {
+        "default": false,
+        "description": "Temporarily set overflow:hidden ancestors to overflow:auto to unlock scroll. Mutates live CSS.",
+        "type": "boolean"
+      },
+      "hint": {
+        "description": "Scroll direction hint for binary-search (image path). Seeds lo/hi bounds to reduce attempts.",
+        "enum": [
+          "above",
+          "below",
+          "left",
+          "right"
+        ],
+        "type": "string"
+      },
+      "include": {
+        "description": "Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "inline": {
+        "default": "center",
+        "description": "Vertical alignment after scroll (CDP path). Default: center.",
+        "enum": [
+          "start",
+          "center",
+          "end",
+          "nearest"
+        ],
+        "type": "string"
+      },
+      "maxDepth": {
+        "default": 3,
+        "description": "Max number of ancestor scroll containers to walk. Default 3.",
+        "maximum": 10,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "port": {
+        "default": 9222,
+        "description": "CDP port (default 9222)",
+        "maximum": 65535,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "retryCount": {
+        "default": 3,
+        "description": "Max scroll attempts (image path binary-search). Default 3, cap 4.",
+        "maximum": 4,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "strategy": {
+        "default": "auto",
+        "description": "auto (default): try CDP → UIA → image in order. cdp: Chrome/Edge only. uia: native Windows UIA. image: image + Win32 binary-search.",
+        "enum": [
+          "auto",
+          "cdp",
+          "uia",
+          "image"
+        ],
+        "type": "string"
+      },
+      "tabId": {
+        "description": "CDP tab ID (Chrome path only). Omit for first page tab.",
+        "type": "string"
+      },
+      "target": {
+        "description": "CSS selector (Chrome/Edge) or partial UIA name (native apps). For CDP path, must be a valid CSS selector (starts with #, ., tag, or [ ). For UIA path, a partial name match against element Name property.",
+        "type": "string"
+      },
+      "verifyWithHash": {
+        "default": false,
+        "description": "Verify scroll effectiveness via perceptual hash comparison. Automatically enabled for image path.",
+        "type": "boolean"
+      },
+      "virtualIndex": {
+        "description": "Target row index in a virtualised list (0-based). Enables direct TanStack/data-index seeking.",
+        "minimum": 0,
+        "type": "integer"
+      },
+      "virtualTotal": {
+        "description": "Total row count in a virtualised list. Required when virtualIndex is set.",
+        "minimum": 1,
+        "type": "integer"
+      },
+      "windowTitle": {
+        "description": "Partial window title. Required for UIA and image paths. For CDP path, optional.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "target"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "capture"
+      },
+      "direction": {
+        "default": "down",
+        "description": "Scroll direction: 'down' (vertical, uses Page Down key) or 'right' (horizontal, uses mouse scroll). Default 'down'.",
+        "enum": [
+          "down",
+          "right"
+        ],
+        "type": "string"
+      },
+      "include": {
+        "description": "Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "maxScrolls": {
+        "default": 10,
+        "description": "Maximum scroll iterations before stopping (default 10, max 30)",
+        "maximum": 30,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "maxWidth": {
+        "default": 1280,
+        "description": "Max size of the short edge of the final image (default 1280). For 'down': caps the image width; height is unconstrained. For 'right': caps the image height; width is unconstrained.",
+        "type": "integer"
+      },
+      "scrollDelayMs": {
+        "default": 400,
+        "description": "Milliseconds to wait after each scroll for rendering to settle (default 400). Increase for slow/animated pages.",
+        "maximum": 3000,
+        "minimum": 100,
+        "type": "integer"
+      },
+      "windowTitle": {
+        "description": "Partial title of the window to capture (case-insensitive match)",
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "windowTitle"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "read"
+      },
+      "include": {
+        "description": "Optional response-shape opt-in. `['envelope']` returns the self-documenting envelope (`_version` / `data` / `as_of` / `confidence`). `['raw']` forces raw shape (overrides DESKTOP_TOUCH_ENVELOPE=1 server default). Default behaviour is raw shape (compat with existing clients).",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "language": {
+        "description": "OCR language code (e.g. 'ja', 'en', 'zh'). Omit to auto-detect from Windows system locale via Intl.DateTimeFormat().resolvedOptions().locale. Default: auto.",
+        "type": "string"
+      },
+      "maxPages": {
+        "default": 20,
+        "description": "Maximum number of scroll steps / OCR pages (default 20, max 50).",
+        "maximum": 50,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "scrollDelayMs": {
+        "default": 400,
+        "description": "Milliseconds to wait after each scroll for rendering to settle (default 400).",
+        "maximum": 3000,
+        "minimum": 100,
+        "type": "integer"
+      },
+      "scrollKey": {
+        "default": "PageDown",
+        "description": "Key sent to scroll one page. PageDown (default): full-page scroll for most apps. Space: web/PDF readers. ArrowDown: line-by-line slow scroll.",
+        "enum": [
+          "PageDown",
+          "Space",
+          "ArrowDown"
+        ],
+        "type": "string"
+      },
+      "stopWhenNoChange": {
+        "default": true,
+        "description": "Stop automatically when two consecutive pages yield no new lines after deduplication (page-end detection). Default true.",
+        "type": "boolean"
+      },
+      "windowTitle": {
+        "description": "Partial window title to focus and OCR (case-insensitive match).",
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "windowTitle"
+    ],
+    "type": "object"
+  }
+]

Addedv1.1.1Apr 28, 2026
Removedv1.1.0Apr 27, 2026
Addedv1.0.3Apr 26, 2026
Removedv0.15.7Apr 20, 2026

Changed1 schema field changedv0.15.4Apr 19, 2026

addedInput schema / properties / hwnd

Added value: +{
+  "description": "Direct window handle ID (takes precedence over windowTitle). Obtain from get_windows response (hwnd field). String type to avoid 64-bit precision issues.",
+  "type": "string"
+}

Changed11 schema fields changedv0.10.0Apr 16, 2026

removedInput schema / $schema

Removed value: -"http://json-schema.org/draft-07/schema#"

addedInput schema / additionalProperties
```
Added value: +false
```

removedInput schema / properties / _stub

Removed value: -{
-  "description": "Stub tool — arguments ignored."
-}

addedInput schema / properties / amount

Added value: +{
+  "default": 3,
+  "description": "Number of scroll steps (default 3)",
+  "type": "integer"
+}

addedInput schema / properties / direction

Added value: +{
+  "description": "Scroll direction",
+  "enum": [
+    "up",
+    "down",
+    "left",
+    "right"
+  ],
+  "type": "string"
+}

addedInput schema / properties / homing

Added value: +{
+  "default": true,
+  "description": "Enable homing correction if the target window moved.",
+  "type": "boolean"
+}

addedInput schema / properties / speed

Added value: +{
+  "description": "Cursor movement speed in px/sec. 0 = instant.",
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / windowTitle

Added value: +{
+  "description": "Partial title of the target window.",
+  "type": "string"
+}

addedInput schema / properties / x

Added value: +{
+  "description": "X coordinate to scroll at (moves cursor there first)",
+  "type": "number"
+}

addedInput schema / properties / y

Added value: +{
+  "description": "Y coordinate to scroll at",
+  "type": "number"
+}

addedInput schema / required
```
Added value: +[
+  "direction"
+]
```

First observedv0.6.2Apr 14, 2026

TDQS

A4.8/5.0

Behavior5/5

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

With no annotations provided, the description fully discloses behavioral traits: scroll amount interpretation (UIA vs legacy), error types (ScrollNotDelivered, OverflowHiddenAncestor, VirtualScrollExhausted), OCR language auto-detection, sizeReduced implications for capture, and that action='read' uses OCR with imperfect accuracy. No contradictions.

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

Conciseness4/5

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

The description is long but well-structured with clear sections (Purpose, Details, Prefer, Caveats, Examples) and front-loaded with a summary. While every sentence adds value, the length may be slightly verbose for a concise reference. Still, it is appropriately sized given the tool's complexity.

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?

Given the tool's complexity (32 parameters, 5 actions) and no output schema, the description covers all necessary aspects: detailed action explanations, usage guidelines, caveats, error handling, and concrete examples. It leaves no significant gaps in understanding for the agent.

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% so baseline is 3. The description adds significant value beyond the schema, such as empirical scroll amounts for 'amount' parameter and clarifying per-action applicability of parameters. However, some schema descriptions are already detailed, so the added value is notable but not exceptional.

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 'Purpose: Scroll a window or page' and enumerates 5 distinct actions (raw, to_element, smart, capture, read) with specific use cases. It distinguishes itself from sibling tools by focusing exclusively on scrolling, mentioning alternatives like browser_eval or browser_overview for browser text extraction.

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

Usage Guidelines5/5

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

The description includes a 'Prefer' section that explicitly tells when to use each action, such as using action='to_element' or action='smart' for out-of-viewport recovery, and caveats like not using action='capture' for mouse_click due to coordinate mismatch. It also advises against scrolling when origin_window_not_visible, suggesting focus_window instead.

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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