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Activate a UI target by snapshot ref, selector, or coordinates, then confirm state changes with settle or verify.

Instructions

Activate a UI target by snapshot ref, selector, or coordinates. Prefer a ref or selector after a snapshot; use coordinates only when semantic targeting is unavailable. This can change app state; use settle or verify to confirm the result without a follow-up snapshot. Times out after 90s; a caller-supplied budget extends it.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
rawNoUse raw snapshot data during selector resolution.
udidNoApple device or simulator UDID; the selector that pins one device when several share a name.
countNoNumber of press/click repetitions.
debugNoEnable debug diagnostics.
depthNoSnapshot traversal depth.
runIdNoLease run identifier.
scopeNoSnapshot scope selector used before resolution.
buttonNoPointer button for platforms that support mouse buttons.
deviceNoDevice name selector (a UDID belongs in udid, a serial in serial).
holdMsNoHold duration for each action.
serialNoAndroid, HarmonyOS, or Vega VVD serial selector.
settleNoAfter 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.
targetYesUI target. This is separate from deviceTarget, which selects the device form.
tenantNoRemote tenant identifier.
verifyNoCapture cheap post-action evidence (AX digest, node counts, changedFromBefore) instead of a follow-up snapshot.
leaseIdNoExisting lease identifier.
sessionNoAgent-device session name.
jitterPxNoRandomization radius in pixels.
noRecordNoDo not record this action.
platformNoPlatform selector used to resolve a device.
doubleTapNoRequest a double-tap action.
timeoutMsNoSettle: wait deadline in milliseconds (default 10000).
intervalMsNoDelay between repeated press/click actions.
includeCostNoInclude per-command agent-cost (cost.wallClockMs, …) in structuredContent. Defaults to off; the default response shape is unchanged.
deviceTargetNoDevice target form. Maps to the CLI --target flag.
responseLevelNoResponse verbosity: token-cheap digest / default (today) / full. Defaults to default; the default response shape is unchanged.
settleQuietMsNoSettle: quiet window in milliseconds (default 500).
mcpOutputFormatNoMCP text content format. Defaults to optimized agent-friendly text; use json for JSON text. Structured content is always returned separately.
androidDeviceAllowlistNoAndroid serial allowlist used for device resolution.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
xNoResolved interaction x coordinate when available.
yNoResolved interaction y coordinate when available.
refNoSnapshot ref without the @ prefix when the target was an @ref.
costNo
hintNo
countNoNumber of press/click repetitions.
buttonNo
holdMsNoHold duration for each action.
settleNo
messageNo
warningNo
evidenceNo
jitterPxNoRandomization radius in pixels.
refLabelNo
selectorNoSelector expression when the target was a selector.
doubleTapNoWhether the command requested a double-tap action.
intervalMsNoDelay between repeated press/click actions.
resolutionNoPre-action disclosure of how the acting path resolved its target. Absent when resolutionDisclosure is inapplicable for the path.
targetKindYesResolved interaction target kind.
selectorChainNo
referenceWidthNoReference frame width for visualizing the interaction point.
targetHittableNo
referenceHeightNoReference frame height for visualizing the interaction point.
maestroFallbackReasonNo
maestroNonHittableCoordinateFallbackUsedNoWhether the direct iOS Maestro coordinate fallback was actually used.
maestroNonHittableCoordinateFallbackAllowedNoWhether the direct iOS Maestro coordinate fallback was allowed for this selector.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changedv0.21.2
    • 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"
      +}
  2. Changed3 schema fields changedv0.21.0
    • 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."
  3. Changed8 schema fields changedv0.20.10
    • 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"
      -}
  4. Changed2 schema fields changedv0.20.9
    • 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"
      +  }
      +]
  5. Changed7 schema fields changedv0.20.2
    • 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"
      +}
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "properties": {
      +    "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"
      +    }
      +  },
      +  "required": [
      +    "targetKind"
      +  ],
      +  "type": "object"
      +}
  6. Changed4 schema fields changedv0.17.11
    • 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"
      +}
  7. Changed1 schema field changedv0.17.7
    • changedInput schema / properties / platform / enum
      Previous value: -[
      -  "ios",
      -  "macos",
      -  "android",
      -  "linux",
      -  "apple"
      -]New value: +[
      +  "ios",
      +  "macos",
      +  "android",
      +  "linux",
      +  "web",
      +  "apple"
      +]
  8. Changed5 schema fields changedv0.17.6
    • 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"
      +]
  9. First observedv0.16.9

TDQS

A4/5.0
Behavior4/5

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

With no annotations, the description carries the full burden, and it delivers: it explicitly warns 'This can change app state', recommends settle or verify to confirm results, and discloses the 90s timeout plus caller-budget extension. It omits some behavioral aspects such as the default action-recording implied by the noRecord parameter, but the core mutation warning and timeout are clearly stated.

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?

Four sentences with zero filler; the action and targeting modes are front-loaded, followed by the state-change warning and timeout. Every sentence contributes distinct information.

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 29-parameter tool with no annotations, the description covers the essential operational facts: what it acts on, how to choose a target, how to confirm the result, and the timeout. An output schema exists, so return values need no description, and the schema itself documents all parameters; the main residual gap is sibling differentiation.

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% and every parameter already has a rich description, so the baseline of 3 applies. The description adds only the preference ordering among target kinds (ref/selector before coordinates), which is useful but minor relative to 29 parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Activate a UI target') and enumerates three targeting mechanisms (snapshot ref, selector, coordinates), going well beyond the tautological tool name. However, it does not explicitly differentiate from similarly-scoped siblings like press, longpress, and gesture, so it falls just short of full sibling distinction.

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

Usage Guidelines4/5

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

Gives actionable when-to-use rules: prefer a ref or selector after a snapshot, and reserve coordinates for when semantic targeting is unavailable. It also prescribes settle/verify as the confirmation path instead of a follow-up snapshot. There is no explicit routing versus sibling input tools (press, gesture, longpress), but the targeting-mode guidance is genuinely operational.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.