Simplify adb_input with string coordinates to fix MCP validation

- Changed all coordinate parameters to string type with empty defaults
- Simplified parameter validation using string checks
- Updated documentation to show string coordinates
- Removed complex optional parameter combinations causing MCP issues

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/server.py

@@ -41,28 +41,6 @@ class ADBCommand(BaseModel):
     device_id: Optional[str] = None
 
 
-class InputAction(BaseModel):
-    """Input action parameters for simulating user interactions"""
-    action_type: str = Field(
-        description="Type of input action to perform",
-        json_schema_extra={
-            "enum": ["tap", "swipe", "key", "text"],
-            "examples": ["tap", "swipe", "key", "text"]
-        }
-    )
-    x: Optional[int] = Field(None, description="X coordinate for tap/swipe start (pixels)", ge=0)
-    y: Optional[int] = Field(None, description="Y coordinate for tap/swipe start (pixels)", ge=0)
-    x2: Optional[int] = Field(None, description="X coordinate for swipe end (pixels)", ge=0)
-    y2: Optional[int] = Field(None, description="Y coordinate for swipe end (pixels)", ge=0)
-    key_code: Optional[str] = Field(
-        None, 
-        description="Android key code (e.g., KEYCODE_BACK, KEYCODE_HOME, KEYCODE_CAMERA)",
-        json_schema_extra={
-            "examples": ["KEYCODE_BACK", "KEYCODE_HOME", "KEYCODE_CAMERA", "KEYCODE_VOLUME_DOWN"]
-        }
-    )
-    text: Optional[str] = Field(None, description="Text to type (for text action type)")
-
 
 # Initialize FastMCP server
 mcp = FastMCP("android-mcp-server")
@@ -172,48 +150,60 @@ async def adb_screenshot(
 
 @mcp.tool()
 async def adb_input(
-    action: InputAction = Field(description="Input action to perform on the device"),
-    device_id: Optional[str] = Field(None, description="Target device ID (if multiple devices connected)")
+    action_type: str,
+    x: str = "",
+    y: str = "",
+    x2: str = "",
+    y2: str = "",
+    key_code: str = "",
+    text: str = "",
+    device_id: Optional[str] = None
 ) -> Dict[str, Any]:
     """
     Send input events to Android device to simulate user interactions.
     
-    Supports various input types:
-    - tap: Single touch at coordinates (requires x, y)
-    - swipe: Drag gesture from one point to another (requires x, y, x2, y2)
-    - key: Hardware key press (requires key_code like KEYCODE_BACK)
-    - text: Type text input (requires text string)
+    Supports various input types with simple parameter interface:
+    - tap: adb_input(action_type="tap", x="400", y="600")
+    - swipe: adb_input(action_type="swipe", x="100", y="200", x2="300", y2="400")
+    - key: adb_input(action_type="key", key_code="KEYCODE_BACK")
+    - text: adb_input(action_type="text", text="Hello World")
     
     Args:
-        action: Input action configuration with type and parameters
+        action_type: Type of input action ("tap", "swipe", "key", "text")
+        x: X coordinate for tap/swipe start (required for tap/swipe)
+        y: Y coordinate for tap/swipe start (required for tap/swipe) 
+        x2: X coordinate for swipe end (required for swipe)
+        y2: Y coordinate for swipe end (required for swipe)
+        key_code: Android key code like KEYCODE_BACK (required for key)
+        text: Text to type (required for text)
         device_id: Specific device to target (optional if only one device)
         
     Returns:
         Command execution result with success status
     """
     
-    if action.action_type == "tap":
-        if action.x is None or action.y is None:
+    if action_type == "tap":
+        if not x or not y:
             raise ValueError("tap action requires x and y coordinates")
-        cmd = ["shell", "input", "tap", str(action.x), str(action.y)]
+        cmd = ["shell", "input", "tap", x, y]
     
-    elif action.action_type == "swipe":
-        if any(coord is None for coord in [action.x, action.y, action.x2, action.y2]):
+    elif action_type == "swipe":
+        if not x or not y or not x2 or not y2:
             raise ValueError("swipe action requires x, y, x2, y2 coordinates")
-        cmd = ["shell", "input", "swipe", str(action.x), str(action.y), str(action.x2), str(action.y2)]
+        cmd = ["shell", "input", "swipe", x, y, x2, y2]
     
-    elif action.action_type == "key":
-        if action.key_code is None:
+    elif action_type == "key":
+        if not key_code:
             raise ValueError("key action requires key_code")
-        cmd = ["shell", "input", "keyevent", action.key_code]
+        cmd = ["shell", "input", "keyevent", key_code]
     
-    elif action.action_type == "text":
-        if action.text is None:
+    elif action_type == "text":
+        if not text:
             raise ValueError("text action requires text")
-        cmd = ["shell", "input", "text", action.text]
+        cmd = ["shell", "input", "text", text]
     
     else:
-        raise ValueError(f"Unknown action type: {action.action_type}")
+        raise ValueError(f"Unknown action type: {action_type}. Must be one of: tap, swipe, key, text")
     
     result = await run_adb_command(cmd, device_id)
     return result