agent-device

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press

Short-press or click a UI target on real iOS, Android, desktop, or TV apps using a snapshot ref, selector, or coordinates; use longpress when a hold gesture is required.

Instructions

Short-press a UI target by snapshot ref, selector, or coordinates. Use longpress instead when the target requires a context-menu or hold gesture. Times out after 90s; a caller-supplied budget extends it.

Input Schema

TableJSON Schema

Name	Required	Description
`raw`	No	Use raw snapshot data during selector resolution.
`udid`	No	Apple device or simulator UDID; the selector that pins one device when several share a name.
`count`	No	Number of press/click repetitions.
`debug`	No	Enable debug diagnostics.
`depth`	No	Snapshot traversal depth.
`runId`	No	Lease run identifier.
`scope`	No	Snapshot scope selector used before resolution.
`device`	No	Device name selector (a UDID belongs in udid, a serial in serial).
`holdMs`	No	Hold duration for each action.
`serial`	No	Android, HarmonyOS, or Vega VVD serial selector.
`settle`	No	After the action, wait for the UI to go quiet and return the settled diff vs the pre-action tree in the same response. Best-effort; never fails the action.
`target`	Yes	UI target. This is separate from deviceTarget, which selects the device form.
`tenant`	No	Remote tenant identifier.
`verify`	No	Capture cheap post-action evidence (AX digest, node counts, changedFromBefore) instead of a follow-up snapshot.
`leaseId`	No	Existing lease identifier.
`session`	No	Agent-device session name.
`jitterPx`	No	Randomization radius in pixels.
`noRecord`	No	Do not record this action.
`platform`	No	Platform selector used to resolve a device.
`doubleTap`	No	Request a double-tap action.
`timeoutMs`	No	Settle: wait deadline in milliseconds (default 10000).
`intervalMs`	No	Delay between repeated press/click actions.
`includeCost`	No	Include per-command agent-cost (cost.wallClockMs, …) in structuredContent. Defaults to off; the default response shape is unchanged.
`deviceTarget`	No	Device target form. Maps to the CLI --target flag.
`responseLevel`	No	Response verbosity: token-cheap digest / default (today) / full. Defaults to default; the default response shape is unchanged.
`settleQuietMs`	No	Settle: quiet window in milliseconds (default 500).
`mcpOutputFormat`	No	MCP text content format. Defaults to optimized agent-friendly text; use json for JSON text. Structured content is always returned separately.
`androidDeviceAllowlist`	No	Android serial allowlist used for device resolution.

Output Schema

TableJSON Schema

Name	Required	Description
`x`	No	Resolved interaction x coordinate when available.
`y`	No	Resolved interaction y coordinate when available.
`ref`	No	Snapshot ref without the @ prefix when the target was an @ref.
`cost`	No
`hint`	No
`count`	No	Number of press/click repetitions.
`button`	No
`holdMs`	No	Hold duration for each action.
`settle`	No
`message`	No
`warning`	No
`evidence`	No
`jitterPx`	No	Randomization radius in pixels.
`refLabel`	No
`selector`	No	Selector expression when the target was a selector.
`doubleTap`	No	Whether the command requested a double-tap action.
`intervalMs`	No	Delay between repeated press/click actions.
`resolution`	No	Pre-action disclosure of how the acting path resolved its target. Absent when resolutionDisclosure is inapplicable for the path.
`targetKind`	Yes	Resolved interaction target kind.
`selectorChain`	No
`referenceWidth`	No	Reference frame width for visualizing the interaction point.
`targetHittable`	No
`referenceHeight`	No	Reference frame height for visualizing the interaction point.
`maestroFallbackReason`	No
`maestroNonHittableCoordinateFallbackUsed`	No	Whether the direct iOS Maestro coordinate fallback was actually used.
`maestroNonHittableCoordinateFallbackAllowed`	No	Whether the direct iOS Maestro coordinate fallback was allowed for this selector.

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedv0.21.2Sep 16, 2026

changedOutput schema / properties / evidence / properties / changedFromBefore / description

Previous value: -"Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure."New value: +"Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure. With surfaceChange present, no digest comparison is made: it reports that surface transition."

addedOutput schema / properties / evidence / properties / surfaceChange

Added value: +{
+  "description": "Present when an in-place system surface (web sign-in or Apple Pay sheet) was presented over the app, or left it.",
+  "properties": {
+    "disclosure": {
+      "description": "Agent-facing sentence explaining the surface transition.",
+      "type": "string"
+    },
+    "from": {
+      "description": "Surface the pre-action baseline described: a host bundle id, or app.",
+      "type": "string"
+    },
+    "to": {
+      "description": "Surface the post-action capture describes: a host bundle id, or app.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "from",
+    "to",
+    "disclosure"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / settle / properties / surfaceChange

Added value: +{
+  "description": "Present when an in-place system surface (web sign-in or Apple Pay sheet) was presented over the app, or left it.",
+  "properties": {
+    "disclosure": {
+      "description": "Agent-facing sentence explaining the surface transition.",
+      "type": "string"
+    },
+    "from": {
+      "description": "Surface the pre-action baseline described: a host bundle id, or app.",
+      "type": "string"
+    },
+    "to": {
+      "description": "Surface the post-action capture describes: a host bundle id, or app.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "from",
+    "to",
+    "disclosure"
+  ],
+  "type": "object"
+}

Changed3 schema fields changedv0.21.0Sep 9, 2026

changedInput schema / properties / device / description

Previous value: -"Device name selector."New value: +"Device name selector (a UDID belongs in udid, a serial in serial)."

changedInput schema / properties / serial / description

Previous value: -"Android device or Vega VVD serial selector."New value: +"Android, HarmonyOS, or Vega VVD serial selector."

changedInput schema / properties / udid / description

Previous value: -"iOS device UDID selector."New value: +"Apple device or simulator UDID; the selector that pins one device when several share a name."

Changed8 schema fields changedv0.20.10Aug 26, 2026

removedInput schema / properties / cwd

Removed value: -{
-  "description": "Working directory for command execution.",
-  "type": "string"
-}

removedInput schema / properties / daemonAuthToken

Removed value: -{
-  "description": "Remote daemon auth token.",
-  "type": "string"
-}

removedInput schema / properties / daemonBaseUrl

Removed value: -{
-  "description": "Remote daemon base URL.",
-  "type": "string"
-}

removedInput schema / properties / iosSimulatorDeviceSet

Removed value: -{
-  "description": "iOS simulator device-set path used for device resolution.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestDerivedDataPath

Removed value: -{
-  "description": "Derived data path for external iOS XCTest runner execution.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestEnvDir

Removed value: -{
-  "description": "Writable directory for iOS XCTest runner env overlays.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestrunFile

Removed value: -{
-  "description": "Externally built iOS XCTest runner .xctestrun artifact path.",
-  "type": "string"
-}

removedInput schema / properties / stateDir

Removed value: -{
-  "description": "Agent-device state directory.",
-  "type": "string"
-}

Changed2 schema fields changedv0.20.9Aug 19, 2026

changedInput schema / properties / platform / enum

Previous value: -[
-  "apple",
-  "android",
-  "vega",
-  "linux",
-  "web",
-  "ios",
-  "macos"
-]New value: +[
+  "apple",
+  "android",
+  "harmonyos",
+  "vega",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

changedOutput schema / properties / resolution / oneOf

Previous value: -[
-  {
-    "properties": {
-      "kind": {
-        "const": "unique",
-        "type": "string"
-      },
-      "phase": {
-        "const": "pre-action",
-        "type": "string"
-      },
-      "source": {
-        "const": "runtime",
-        "type": "string"
-      }
-    },
-    "required": [
-      "source",
-      "phase",
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "alternatives": {
-        "description": "At most 5 losing candidates, document order. Present at default/full response levels and omitted in digest. The winner is never included.",
-        "items": {
-          "properties": {
-            "diagnosticRef": {
-              "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
-              "type": "string"
-            },
-            "label": {
-              "description": "UTF-8 truncated to 256 bytes.",
-              "type": "string"
-            },
-            "role": {
-              "description": "UTF-8 truncated to 256 bytes.",
-              "type": "string"
-            }
-          },
-          "required": [
-            "diagnosticRef"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "kind": {
-        "const": "disambiguated",
-        "type": "string"
-      },
-      "matchCount": {
-        "description": "Total matches resolveSelectorChain found before disambiguation.",
-        "type": "number"
-      },
-      "phase": {
-        "const": "pre-action",
-        "type": "string"
-      },
-      "source": {
-        "const": "runtime",
-        "type": "string"
-      },
-      "tiebreak": {
-        "description": "The comparison that decided the winner.",
-        "enum": [
-          "visible",
-          "deepest",
-          "smallest-area"
-        ],
-        "type": "string"
-      },
-      "winnerDiagnostic": {
-        "properties": {
-          "diagnosticRef": {
-            "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
-            "type": "string"
-          },
-          "label": {
-            "description": "UTF-8 truncated to 256 bytes.",
-            "type": "string"
-          },
-          "role": {
-            "description": "UTF-8 truncated to 256 bytes.",
-            "type": "string"
-          }
-        },
-        "required": [
-          "diagnosticRef"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "source",
-      "phase",
-      "kind",
-      "matchCount",
-      "winnerDiagnostic",
-      "tiebreak"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "exact",
-        "type": "string"
-      },
-      "phase": {
-        "const": "pre-action",
-        "type": "string"
-      },
-      "source": {
-        "const": "ref",
-        "type": "string"
-      }
-    },
-    "required": [
-      "source",
-      "phase",
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "label-fallback",
-        "type": "string"
-      },
-      "phase": {
-        "const": "pre-action",
-        "type": "string"
-      },
-      "source": {
-        "const": "ref",
-        "type": "string"
-      }
-    },
-    "required": [
-      "source",
-      "phase",
-      "kind"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "not-observed",
-        "type": "string"
-      },
-      "source": {
-        "const": "direct-ios",
-        "type": "string"
-      }
-    },
-    "required": [
-      "source",
-      "kind"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "unique",
+        "type": "string"
+      },
+      "phase": {
+        "const": "pre-action",
+        "type": "string"
+      },
+      "source": {
+        "const": "runtime",
+        "type": "string"
+      }
+    },
+    "required": [
+      "source",
+      "phase",
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "alternatives": {
+        "description": "At most 5 losing candidates, document order. Present at default/full response levels and omitted in digest. The winner is never included.",
+        "items": {
+          "properties": {
+            "diagnosticRef": {
+              "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
+              "type": "string"
+            },
+            "label": {
+              "description": "UTF-8 truncated to 256 bytes.",
+              "type": "string"
+            },
+            "role": {
+              "description": "UTF-8 truncated to 256 bytes.",
+              "type": "string"
+            }
+          },
+          "required": [
+            "diagnosticRef"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "kind": {
+        "const": "disambiguated",
+        "type": "string"
+      },
+      "matchCount": {
+        "description": "Total matches resolveSelectorChain found before disambiguation.",
+        "type": "number"
+      },
+      "phase": {
+        "const": "pre-action",
+        "type": "string"
+      },
+      "source": {
+        "const": "runtime",
+        "type": "string"
+      },
+      "tiebreak": {
+        "description": "The comparison that decided the winner.",
+        "enum": [
+          "visible",
+          "deepest",
+          "smallest-area",
+          "structural-equivalence"
+        ],
+        "type": "string"
+      },
+      "winnerDiagnostic": {
+        "properties": {
+          "diagnosticRef": {
+            "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
+            "type": "string"
+          },
+          "label": {
+            "description": "UTF-8 truncated to 256 bytes.",
+            "type": "string"
+          },
+          "role": {
+            "description": "UTF-8 truncated to 256 bytes.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "diagnosticRef"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "source",
+      "phase",
+      "kind",
+      "matchCount",
+      "winnerDiagnostic",
+      "tiebreak"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "exact",
+        "type": "string"
+      },
+      "phase": {
+        "const": "pre-action",
+        "type": "string"
+      },
+      "source": {
+        "const": "ref",
+        "type": "string"
+      }
+    },
+    "required": [
+      "source",
+      "phase",
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "label-fallback",
+        "type": "string"
+      },
+      "phase": {
+        "const": "pre-action",
+        "type": "string"
+      },
+      "source": {
+        "const": "ref",
+        "type": "string"
+      }
+    },
+    "required": [
+      "source",
+      "phase",
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "not-observed",
+        "type": "string"
+      },
+      "source": {
+        "const": "direct-ios",
+        "type": "string"
+      }
+    },
+    "required": [
+      "source",
+      "kind"
+    ],
+    "type": "object"
+  }
+]

Changed9 schema fields changedv0.20.2Jul 30, 2026

addedInput schema / properties / noRecord

Added value: +{
+  "description": "Do not record this action.",
+  "type": "boolean"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "apple",
-  "android",
-  "linux",
-  "web",
-  "ios",
-  "macos"
-]New value: +[
+  "apple",
+  "android",
+  "vega",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

changedInput schema / properties / serial / description

Previous value: -"Android serial selector."New value: +"Android device or Vega VVD serial selector."

addedInput schema / properties / settle

Added value: +{
+  "description": "After the action, wait for the UI to go quiet and return the settled diff vs the pre-action tree in the same response. Best-effort; never fails the action.",
+  "type": "boolean"
+}

addedInput schema / properties / settleQuietMs

Added value: +{
+  "description": "Settle: quiet window in milliseconds (default 500).",
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / timeoutMs

Added value: +{
+  "description": "Settle: wait deadline in milliseconds (default 10000).",
+  "minimum": 1,
+  "type": "integer"
+}

removedOutput schema / oneOf

Removed value: -[
-  {
-    "properties": {
-      "backendResult": {
-        "additionalProperties": true,
-        "description": "Raw backend result passthrough.",
-        "type": "object"
-      },
-      "evidence": {
-        "properties": {
-          "changedFromBefore": {
-            "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
-            "type": "boolean"
-          },
-          "digest": {
-            "description": "Order-independent digest of the post-action node multiset.",
-            "type": "string"
-          },
-          "foregroundApp": {
-            "description": "Foreground app bundle id or name, when the capture carries it.",
-            "type": "string"
-          },
-          "interactiveNodeCount": {
-            "description": "Subset of nodeCount the platform reports as hittable.",
-            "type": "number"
-          },
-          "nodeCount": {
-            "description": "Node count in the post-action interactive-only capture.",
-            "type": "number"
-          }
-        },
-        "required": [
-          "nodeCount",
-          "interactiveNodeCount",
-          "digest",
-          "changedFromBefore"
-        ],
-        "type": "object"
-      },
-      "kind": {
-        "const": "point",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "point": {
-        "properties": {
-          "x": {
-            "type": "number"
-          },
-          "y": {
-            "type": "number"
-          }
-        },
-        "required": [
-          "x",
-          "y"
-        ],
-        "type": "object"
-      },
-      "warning": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "point"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "backendResult": {
-        "additionalProperties": true,
-        "description": "Raw backend result passthrough.",
-        "type": "object"
-      },
-      "evidence": {
-        "properties": {
-          "changedFromBefore": {
-            "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
-            "type": "boolean"
-          },
-          "digest": {
-            "description": "Order-independent digest of the post-action node multiset.",
-            "type": "string"
-          },
-          "foregroundApp": {
-            "description": "Foreground app bundle id or name, when the capture carries it.",
-            "type": "string"
-          },
-          "interactiveNodeCount": {
-            "description": "Subset of nodeCount the platform reports as hittable.",
-            "type": "number"
-          },
-          "nodeCount": {
-            "description": "Node count in the post-action interactive-only capture.",
-            "type": "number"
-          }
-        },
-        "required": [
-          "nodeCount",
-          "interactiveNodeCount",
-          "digest",
-          "changedFromBefore"
-        ],
-        "type": "object"
-      },
-      "hint": {
-        "type": "string"
-      },
-      "kind": {
-        "const": "ref",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "node": {
-        "description": "Resolved snapshot node for the matched element.",
-        "properties": {
-          "appName": {
-            "type": "string"
-          },
-          "bundleId": {
-            "type": "string"
-          },
-          "depth": {
-            "type": "number"
-          },
-          "enabled": {
-            "type": "boolean"
-          },
-          "focused": {
-            "type": "boolean"
-          },
-          "hiddenContentAbove": {
-            "type": "boolean"
-          },
-          "hiddenContentBelow": {
-            "type": "boolean"
-          },
-          "hittable": {
-            "type": "boolean"
-          },
-          "identifier": {
-            "type": "string"
-          },
-          "index": {
-            "type": "number"
-          },
-          "interactionBlocked": {
-            "enum": [
-              "covered"
-            ],
-            "type": "string"
-          },
-          "label": {
-            "type": "string"
-          },
-          "parentIndex": {
-            "type": "number"
-          },
-          "pid": {
-            "type": "number"
-          },
-          "presentationHints": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          },
-          "rect": {
-            "properties": {
-              "height": {
-                "type": "number"
-              },
-              "width": {
-                "type": "number"
-              },
-              "x": {
-                "type": "number"
-              },
-              "y": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "x",
-              "y",
-              "width",
-              "height"
-            ],
-            "type": "object"
-          },
-          "ref": {
-            "description": "Stable snapshot ref such as e12.",
-            "type": "string"
-          },
-          "role": {
-            "type": "string"
-          },
-          "selected": {
-            "type": "boolean"
-          },
-          "subrole": {
-            "type": "string"
-          },
-          "surface": {
-            "type": "string"
-          },
-          "type": {
-            "type": "string"
-          },
-          "value": {
-            "type": "string"
-          },
-          "visibleToUser": {
-            "type": "boolean"
-          },
-          "windowTitle": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "index",
-          "ref"
-        ],
-        "type": "object"
-      },
-      "point": {
-        "properties": {
-          "x": {
-            "type": "number"
-          },
-          "y": {
-            "type": "number"
-          }
-        },
-        "required": [
-          "x",
-          "y"
-        ],
-        "type": "object"
-      },
-      "refLabel": {
-        "type": "string"
-      },
-      "selectorChain": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "target": {
-        "properties": {
-          "kind": {
-            "const": "ref",
-            "type": "string"
-          },
-          "ref": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "ref"
-        ],
-        "type": "object"
-      },
-      "targetHittable": {
-        "type": "boolean"
-      },
-      "warning": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "target"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "backendResult": {
-        "additionalProperties": true,
-        "description": "Raw backend result passthrough.",
-        "type": "object"
-      },
-      "evidence": {
-        "properties": {
-          "changedFromBefore": {
-            "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
-            "type": "boolean"
-          },
-          "digest": {
-            "description": "Order-independent digest of the post-action node multiset.",
-            "type": "string"
-          },
-          "foregroundApp": {
-            "description": "Foreground app bundle id or name, when the capture carries it.",
-            "type": "string"
-          },
-          "interactiveNodeCount": {
-            "description": "Subset of nodeCount the platform reports as hittable.",
-            "type": "number"
-          },
-          "nodeCount": {
-            "description": "Node count in the post-action interactive-only capture.",
-            "type": "number"
-          }
-        },
-        "required": [
-          "nodeCount",
-          "interactiveNodeCount",
-          "digest",
-          "changedFromBefore"
-        ],
-        "type": "object"
-      },
-      "hint": {
-        "type": "string"
-      },
-      "kind": {
-        "const": "selector",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "node": {
-        "description": "Resolved snapshot node for the matched element.",
-        "properties": {
-          "appName": {
-            "type": "string"
-          },
-          "bundleId": {
-            "type": "string"
-          },
-          "depth": {
-            "type": "number"
-          },
-          "enabled": {
-            "type": "boolean"
-          },
-          "focused": {
-            "type": "boolean"
-          },
-          "hiddenContentAbove": {
-            "type": "boolean"
-          },
-          "hiddenContentBelow": {
-            "type": "boolean"
-          },
-          "hittable": {
-            "type": "boolean"
-          },
-          "identifier": {
-            "type": "string"
-          },
-          "index": {
-            "type": "number"
-          },
-          "interactionBlocked": {
-            "enum": [
-              "covered"
-            ],
-            "type": "string"
-          },
-          "label": {
-            "type": "string"
-          },
-          "parentIndex": {
-            "type": "number"
-          },
-          "pid": {
-            "type": "number"
-          },
-          "presentationHints": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          },
-          "rect": {
-            "properties": {
-              "height": {
-                "type": "number"
-              },
-              "width": {
-                "type": "number"
-              },
-              "x": {
-                "type": "number"
-              },
-              "y": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "x",
-              "y",
-              "width",
-              "height"
-            ],
-            "type": "object"
-          },
-          "ref": {
-            "description": "Stable snapshot ref such as e12.",
-            "type": "string"
-          },
-          "role": {
-            "type": "string"
-          },
-          "selected": {
-            "type": "boolean"
-          },
-          "subrole": {
-            "type": "string"
-          },
-          "surface": {
-            "type": "string"
-          },
-          "type": {
-            "type": "string"
-          },
-          "value": {
-            "type": "string"
-          },
-          "visibleToUser": {
-            "type": "boolean"
-          },
-          "windowTitle": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "index",
-          "ref"
-        ],
-        "type": "object"
-      },
-      "point": {
-        "properties": {
-          "x": {
-            "type": "number"
-          },
-          "y": {
-            "type": "number"
-          }
-        },
-        "required": [
-          "x",
-          "y"
-        ],
-        "type": "object"
-      },
-      "refLabel": {
-        "type": "string"
-      },
-      "selectorChain": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "target": {
-        "properties": {
-          "kind": {
-            "const": "selector",
-            "type": "string"
-          },
-          "selector": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "selector"
-        ],
-        "type": "object"
-      },
-      "targetHittable": {
-        "type": "boolean"
-      },
-      "warning": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "point",
-      "target",
-      "node",
-      "selectorChain"
-    ],
-    "type": "object"
-  }
-]

addedOutput schema / properties

Added value: +{
+  "button": {
+    "enum": [
+      "secondary",
+      "middle"
+    ],
+    "type": "string"
+  },
+  "cost": {
+    "properties": {
+      "nodeCount": {
+        "description": "Number of nodes in the original node tree when the response carries one.",
+        "type": "number"
+      },
+      "runnerRoundTrips": {
+        "description": "Number of real runner round-trips made while serving the request.",
+        "type": "number"
+      },
+      "wallClockMs": {
+        "description": "Total wall-clock time for the request in milliseconds.",
+        "type": "number"
+      }
+    },
+    "required": [
+      "wallClockMs",
+      "runnerRoundTrips"
+    ],
+    "type": "object"
+  },
+  "count": {
+    "description": "Number of press/click repetitions.",
+    "type": "number"
+  },
+  "doubleTap": {
+    "description": "Whether the command requested a double-tap action.",
+    "type": "boolean"
+  },
+  "evidence": {
+    "properties": {
+      "changedFromBefore": {
+        "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
+        "type": "boolean"
+      },
+      "digest": {
+        "description": "Order-independent digest of the post-action node multiset.",
+        "type": "string"
+      },
+      "foregroundApp": {
+        "description": "Foreground app bundle id or name, when the capture carries it.",
+        "type": "string"
+      },
+      "interactiveNodeCount": {
+        "description": "Subset of nodeCount the platform reports as hittable.",
+        "type": "number"
+      },
+      "nodeCount": {
+        "description": "Node count in the post-action interactive-only capture.",
+        "type": "number"
+      }
+    },
+    "required": [
+      "nodeCount",
+      "interactiveNodeCount",
+      "digest",
+      "changedFromBefore"
+    ],
+    "type": "object"
+  },
+  "hint": {
+    "type": "string"
+  },
+  "holdMs": {
+    "description": "Hold duration for each action.",
+    "type": "number"
+  },
+  "intervalMs": {
+    "description": "Delay between repeated press/click actions.",
+    "type": "number"
+  },
+  "jitterPx": {
+    "description": "Randomization radius in pixels.",
+    "type": "number"
+  },
+  "maestroFallbackReason": {
+    "const": "non-hittable-coordinate",
+    "type": "string"
+  },
+  "maestroNonHittableCoordinateFallbackAllowed": {
+    "description": "Whether the direct iOS Maestro coordinate fallback was allowed for this selector.",
+    "type": "boolean"
+  },
+  "maestroNonHittableCoordinateFallbackUsed": {
+    "description": "Whether the direct iOS Maestro coordinate fallback was actually used.",
+    "type": "boolean"
+  },
+  "message": {
+    "type": "string"
+  },
+  "ref": {
+    "description": "Snapshot ref without the @ prefix when the target was an @ref.",
+    "type": "string"
+  },
+  "refLabel": {
+    "type": "string"
+  },
+  "referenceHeight": {
+    "description": "Reference frame height for visualizing the interaction point.",
+    "type": "number"
+  },
+  "referenceWidth": {
+    "description": "Reference frame width for visualizing the interaction point.",
+    "type": "number"
+  },
+  "resolution": {
+    "description": "Pre-action disclosure of how the acting path resolved its target. Absent when resolutionDisclosure is inapplicable for the path.",
+    "oneOf": [
+      {
+        "properties": {
+          "kind": {
+            "const": "unique",
+            "type": "string"
+          },
+          "phase": {
+            "const": "pre-action",
+            "type": "string"
+          },
+          "source": {
+            "const": "runtime",
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "phase",
+          "kind"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "alternatives": {
+            "description": "At most 5 losing candidates, document order. Present at default/full response levels and omitted in digest. The winner is never included.",
+            "items": {
+              "properties": {
+                "diagnosticRef": {
+                  "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
+                  "type": "string"
+                },
+                "label": {
+                  "description": "UTF-8 truncated to 256 bytes.",
+                  "type": "string"
+                },
+                "role": {
+                  "description": "UTF-8 truncated to 256 bytes.",
+                  "type": "string"
+                }
+              },
+              "required": [
+                "diagnosticRef"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "kind": {
+            "const": "disambiguated",
+            "type": "string"
+          },
+          "matchCount": {
+            "description": "Total matches resolveSelectorChain found before disambiguation.",
+            "type": "number"
+          },
+          "phase": {
+            "const": "pre-action",
+            "type": "string"
+          },
+          "source": {
+            "const": "runtime",
+            "type": "string"
+          },
+          "tiebreak": {
+            "description": "The comparison that decided the winner.",
+            "enum": [
+              "visible",
+              "deepest",
+              "smallest-area"
+            ],
+            "type": "string"
+          },
+          "winnerDiagnostic": {
+            "properties": {
+              "diagnosticRef": {
+                "description": "Opaque non-@ diagnostic token. Never a snapshot ref: not issued via refsGeneration and cannot be pinned or reused as an @ref target. UTF-8 truncated to 256 bytes.",
+                "type": "string"
+              },
+              "label": {
+                "description": "UTF-8 truncated to 256 bytes.",
+                "type": "string"
+              },
+              "role": {
+                "description": "UTF-8 truncated to 256 bytes.",
+                "type": "string"
+              }
+            },
+            "required": [
+              "diagnosticRef"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "source",
+          "phase",
+          "kind",
+          "matchCount",
+          "winnerDiagnostic",
+          "tiebreak"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "kind": {
+            "const": "exact",
+            "type": "string"
+          },
+          "phase": {
+            "const": "pre-action",
+            "type": "string"
+          },
+          "source": {
+            "const": "ref",
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "phase",
+          "kind"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "kind": {
+            "const": "label-fallback",
+            "type": "string"
+          },
+          "phase": {
+            "const": "pre-action",
+            "type": "string"
+          },
+          "source": {
+            "const": "ref",
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "phase",
+          "kind"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "kind": {
+            "const": "not-observed",
+            "type": "string"
+          },
+          "source": {
+            "const": "direct-ios",
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "kind"
+        ],
+        "type": "object"
+      }
+    ],
+    "type": "object"
+  },
+  "selector": {
+    "description": "Selector expression when the target was a selector.",
+    "type": "string"
+  },
+  "selectorChain": {
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  },
+  "settle": {
+    "properties": {
+      "captures": {
+        "type": "number"
+      },
+      "diff": {
+        "description": "Settled diff vs the pre-action tree (changed lines only).",
+        "properties": {
+          "lines": {
+            "items": {
+              "properties": {
+                "kind": {
+                  "enum": [
+                    "added",
+                    "removed"
+                  ],
+                  "type": "string"
+                },
+                "ref": {
+                  "description": "Plain ref body (e12) for added lines.",
+                  "type": "string"
+                },
+                "text": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "kind",
+                "text"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "summary": {
+            "properties": {
+              "additions": {
+                "type": "number"
+              },
+              "removals": {
+                "type": "number"
+              },
+              "unchanged": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "additions",
+              "removals",
+              "unchanged"
+            ],
+            "type": "object"
+          },
+          "truncated": {
+            "description": "Lines were capped to the response bound.",
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "summary",
+          "lines"
+        ],
+        "type": "object"
+      },
+      "hint": {
+        "type": "string"
+      },
+      "quietMs": {
+        "type": "number"
+      },
+      "refs": {
+        "items": {
+          "properties": {
+            "ref": {
+              "description": "Plain ref body (e12) minted from the stored settled tree.",
+              "type": "string"
+            }
+          },
+          "required": [
+            "ref"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "refsGeneration": {
+        "description": "Snapshot generation of the stored settled tree; refs on added diff lines were minted from it.",
+        "type": "number"
+      },
+      "settled": {
+        "description": "Whether the UI held the quiet window before the deadline. false is advisory, not failure.",
+        "type": "boolean"
+      },
+      "tail": {
+        "description": "Unchanged interactive refs tail: still-present, actionable elements from the settled tree, attached only when diff carries zero added-line refs (a modal-dismiss/toast-only diff).",
+        "items": {
+          "properties": {
+            "label": {
+              "type": "string"
+            },
+            "ref": {
+              "description": "Plain ref body (e12) minted from the stored settled tree.",
+              "type": "string"
+            },
+            "role": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "ref",
+            "role"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "tailTruncated": {
+        "description": "Present (true) when tail candidates exceeded the response cap.",
+        "type": "boolean"
+      },
+      "timeoutMs": {
+        "type": "number"
+      },
+      "waitedMs": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "settled",
+      "waitedMs",
+      "captures",
+      "quietMs",
+      "timeoutMs"
+    ],
+    "type": "object"
+  },
+  "targetHittable": {
+    "type": "boolean"
+  },
+  "targetKind": {
+    "description": "Resolved interaction target kind.",
+    "enum": [
+      "point",
+      "ref",
+      "selector"
+    ],
+    "type": "string"
+  },
+  "warning": {
+    "type": "string"
+  },
+  "x": {
+    "description": "Resolved interaction x coordinate when available.",
+    "type": "number"
+  },
+  "y": {
+    "description": "Resolved interaction y coordinate when available.",
+    "type": "number"
+  }
+}

addedOutput schema / required
```
Added value: +[
+  "targetKind"
+]
```

Changed5 schema fields changedv0.17.11Jul 6, 2026

addedInput schema / properties / includeCost

Added value: +{
+  "description": "Include per-command agent-cost (cost.wallClockMs, …) in structuredContent. Defaults to off; the default response shape is unchanged.",
+  "type": "boolean"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "macos",
-  "android",
-  "linux",
-  "web",
-  "apple"
-]New value: +[
+  "apple",
+  "android",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

addedInput schema / properties / responseLevel

Added value: +{
+  "description": "Response verbosity: token-cheap digest / default (today) / full. Defaults to default; the default response shape is unchanged.",
+  "enum": [
+    "digest",
+    "default",
+    "full"
+  ],
+  "type": "string"
+}

addedInput schema / properties / verify

Added value: +{
+  "description": "Capture cheap post-action evidence (AX digest, node counts, changedFromBefore) instead of a follow-up snapshot.",
+  "type": "boolean"
+}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "oneOf": [
+    {
+      "properties": {
+        "backendResult": {
+          "additionalProperties": true,
+          "description": "Raw backend result passthrough.",
+          "type": "object"
+        },
+        "evidence": {
+          "properties": {
+            "changedFromBefore": {
+              "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
+              "type": "boolean"
+            },
+            "digest": {
+              "description": "Order-independent digest of the post-action node multiset.",
+              "type": "string"
+            },
+            "foregroundApp": {
+              "description": "Foreground app bundle id or name, when the capture carries it.",
+              "type": "string"
+            },
+            "interactiveNodeCount": {
+              "description": "Subset of nodeCount the platform reports as hittable.",
+              "type": "number"
+            },
+            "nodeCount": {
+              "description": "Node count in the post-action interactive-only capture.",
+              "type": "number"
+            }
+          },
+          "required": [
+            "nodeCount",
+            "interactiveNodeCount",
+            "digest",
+            "changedFromBefore"
+          ],
+          "type": "object"
+        },
+        "kind": {
+          "const": "point",
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "point": {
+          "properties": {
+            "x": {
+              "type": "number"
+            },
+            "y": {
+              "type": "number"
+            }
+          },
+          "required": [
+            "x",
+            "y"
+          ],
+          "type": "object"
+        },
+        "warning": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "point"
+      ],
+      "type": "object"
+    },
+    {
+      "properties": {
+        "backendResult": {
+          "additionalProperties": true,
+          "description": "Raw backend result passthrough.",
+          "type": "object"
+        },
+        "evidence": {
+          "properties": {
+            "changedFromBefore": {
+              "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
+              "type": "boolean"
+            },
+            "digest": {
+              "description": "Order-independent digest of the post-action node multiset.",
+              "type": "string"
+            },
+            "foregroundApp": {
+              "description": "Foreground app bundle id or name, when the capture carries it.",
+              "type": "string"
+            },
+            "interactiveNodeCount": {
+              "description": "Subset of nodeCount the platform reports as hittable.",
+              "type": "number"
+            },
+            "nodeCount": {
+              "description": "Node count in the post-action interactive-only capture.",
+              "type": "number"
+            }
+          },
+          "required": [
+            "nodeCount",
+            "interactiveNodeCount",
+            "digest",
+            "changedFromBefore"
+          ],
+          "type": "object"
+        },
+        "hint": {
+          "type": "string"
+        },
+        "kind": {
+          "const": "ref",
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "node": {
+          "description": "Resolved snapshot node for the matched element.",
+          "properties": {
+            "appName": {
+              "type": "string"
+            },
+            "bundleId": {
+              "type": "string"
+            },
+            "depth": {
+              "type": "number"
+            },
+            "enabled": {
+              "type": "boolean"
+            },
+            "focused": {
+              "type": "boolean"
+            },
+            "hiddenContentAbove": {
+              "type": "boolean"
+            },
+            "hiddenContentBelow": {
+              "type": "boolean"
+            },
+            "hittable": {
+              "type": "boolean"
+            },
+            "identifier": {
+              "type": "string"
+            },
+            "index": {
+              "type": "number"
+            },
+            "interactionBlocked": {
+              "enum": [
+                "covered"
+              ],
+              "type": "string"
+            },
+            "label": {
+              "type": "string"
+            },
+            "parentIndex": {
+              "type": "number"
+            },
+            "pid": {
+              "type": "number"
+            },
+            "presentationHints": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "rect": {
+              "properties": {
+                "height": {
+                  "type": "number"
+                },
+                "width": {
+                  "type": "number"
+                },
+                "x": {
+                  "type": "number"
+                },
+                "y": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "x",
+                "y",
+                "width",
+                "height"
+              ],
+              "type": "object"
+            },
+            "ref": {
+              "description": "Stable snapshot ref such as e12.",
+              "type": "string"
+            },
+            "role": {
+              "type": "string"
+            },
+            "selected": {
+              "type": "boolean"
+            },
+            "subrole": {
+              "type": "string"
+            },
+            "surface": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string"
+            },
+            "value": {
+              "type": "string"
+            },
+            "visibleToUser": {
+              "type": "boolean"
+            },
+            "windowTitle": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "index",
+            "ref"
+          ],
+          "type": "object"
+        },
+        "point": {
+          "properties": {
+            "x": {
+              "type": "number"
+            },
+            "y": {
+              "type": "number"
+            }
+          },
+          "required": [
+            "x",
+            "y"
+          ],
+          "type": "object"
+        },
+        "refLabel": {
+          "type": "string"
+        },
+        "selectorChain": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "target": {
+          "properties": {
+            "kind": {
+              "const": "ref",
+              "type": "string"
+            },
+            "ref": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "kind",
+            "ref"
+          ],
+          "type": "object"
+        },
+        "targetHittable": {
+          "type": "boolean"
+        },
+        "warning": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "target"
+      ],
+      "type": "object"
+    },
+    {
+      "properties": {
+        "backendResult": {
+          "additionalProperties": true,
+          "description": "Raw backend result passthrough.",
+          "type": "object"
+        },
+        "evidence": {
+          "properties": {
+            "changedFromBefore": {
+              "description": "Whether the post-action digest differs from the pre-action capture digest. false is evidence, not failure.",
+              "type": "boolean"
+            },
+            "digest": {
+              "description": "Order-independent digest of the post-action node multiset.",
+              "type": "string"
+            },
+            "foregroundApp": {
+              "description": "Foreground app bundle id or name, when the capture carries it.",
+              "type": "string"
+            },
+            "interactiveNodeCount": {
+              "description": "Subset of nodeCount the platform reports as hittable.",
+              "type": "number"
+            },
+            "nodeCount": {
+              "description": "Node count in the post-action interactive-only capture.",
+              "type": "number"
+            }
+          },
+          "required": [
+            "nodeCount",
+            "interactiveNodeCount",
+            "digest",
+            "changedFromBefore"
+          ],
+          "type": "object"
+        },
+        "hint": {
+          "type": "string"
+        },
+        "kind": {
+          "const": "selector",
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "node": {
+          "description": "Resolved snapshot node for the matched element.",
+          "properties": {
+            "appName": {
+              "type": "string"
+            },
+            "bundleId": {
+              "type": "string"
+            },
+            "depth": {
+              "type": "number"
+            },
+            "enabled": {
+              "type": "boolean"
+            },
+            "focused": {
+              "type": "boolean"
+            },
+            "hiddenContentAbove": {
+              "type": "boolean"
+            },
+            "hiddenContentBelow": {
+              "type": "boolean"
+            },
+            "hittable": {
+              "type": "boolean"
+            },
+            "identifier": {
+              "type": "string"
+            },
+            "index": {
+              "type": "number"
+            },
+            "interactionBlocked": {
+              "enum": [
+                "covered"
+              ],
+              "type": "string"
+            },
+            "label": {
+              "type": "string"
+            },
+            "parentIndex": {
+              "type": "number"
+            },
+            "pid": {
+              "type": "number"
+            },
+            "presentationHints": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "rect": {
+              "properties": {
+                "height": {
+                  "type": "number"
+                },
+                "width": {
+                  "type": "number"
+                },
+                "x": {
+                  "type": "number"
+                },
+                "y": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "x",
+                "y",
+                "width",
+                "height"
+              ],
+              "type": "object"
+            },
+            "ref": {
+              "description": "Stable snapshot ref such as e12.",
+              "type": "string"
+            },
+            "role": {
+              "type": "string"
+            },
+            "selected": {
+              "type": "boolean"
+            },
+            "subrole": {
+              "type": "string"
+            },
+            "surface": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string"
+            },
+            "value": {
+              "type": "string"
+            },
+            "visibleToUser": {
+              "type": "boolean"
+            },
+            "windowTitle": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "index",
+            "ref"
+          ],
+          "type": "object"
+        },
+        "point": {
+          "properties": {
+            "x": {
+              "type": "number"
+            },
+            "y": {
+              "type": "number"
+            }
+          },
+          "required": [
+            "x",
+            "y"
+          ],
+          "type": "object"
+        },
+        "refLabel": {
+          "type": "string"
+        },
+        "selectorChain": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "target": {
+          "properties": {
+            "kind": {
+              "const": "selector",
+              "type": "string"
+            },
+            "selector": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "kind",
+            "selector"
+          ],
+          "type": "object"
+        },
+        "targetHittable": {
+          "type": "boolean"
+        },
+        "warning": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "kind",
+        "point",
+        "target",
+        "node",
+        "selectorChain"
+      ],
+      "type": "object"
+    }
+  ],
+  "type": "object"
+}

Changed1 schema field changedv0.17.7Jun 23, 2026

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "macos",
-  "android",
-  "linux",
-  "apple"
-]New value: +[
+  "ios",
+  "macos",
+  "android",
+  "linux",
+  "web",
+  "apple"
+]

Changed5 schema fields changedv0.17.6Jun 18, 2026

addedInput schema / properties / iosXctestDerivedDataPath

Added value: +{
+  "description": "Derived data path for external iOS XCTest runner execution.",
+  "type": "string"
+}

addedInput schema / properties / iosXctestEnvDir

Added value: +{
+  "description": "Writable directory for iOS XCTest runner env overlays.",
+  "type": "string"
+}

addedInput schema / properties / iosXctestrunFile

Added value: +{
+  "description": "Externally built iOS XCTest runner .xctestrun artifact path.",
+  "type": "string"
+}

addedInput schema / properties / mcpOutputFormat

Added value: +{
+  "description": "MCP text content format. Defaults to optimized agent-friendly text; use json for JSON text. Structured content is always returned separately.",
+  "enum": [
+    "optimized",
+    "json"
+  ],
+  "type": "string"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "android",
-  "macos",
-  "linux",
-  "apple"
-]New value: +[
+  "ios",
+  "macos",
+  "android",
+  "linux",
+  "apple"
+]

First observedv0.16.9Jun 3, 2026

TDQS

A4.4/5.0

Behavior4/5

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

With no annotations, the description carries the burden of behavioral disclosure. It does that by revealing the interaction (short-press), the supported target forms, and a concrete timeout behavior: 90s default, extendable by a caller-supplied budget. It does not discuss side effects on UI state or device prerequisites, but the core runtime behavior is disclosed.

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 tight sentences: action and target forms first, alternative routing second, timeout/budget last. Every clause earns its place and there is no repetition of schema details.

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 28-parameter tool with no annotations, the description does not try to enumerate parameters but gives the essentials needed for selection and safe invocation: what it acts on, the main alternative, and the time limit. It slightly undersells the breadth of the action, but the rich schema and output schema cover most invocation details.

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 schema already documents every parameter. The description's mention of ref/selector/coordinates maps to the target oneOf but adds little beyond it; no new meaning is added for count, settle, verify, or the many optional fields. Baseline 3 is appropriate.

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 opens with a specific verb and resource, 'Short-press a UI target,' and explicitly names the three target forms: snapshot ref, selector, or coordinates. It also distinguishes the tool from longpress, so an agent can tell it apart from its closest sibling without opening the schema.

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?

It explicitly states when not to use this tool and names the alternative: 'Use longpress instead when the target requires a context-menu or hold gesture.' The timeout/budget sentence also gives operational guidance about how long the call may take.

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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