diff --git a/python/commands/wire_manager.py b/python/commands/wire_manager.py
index eb55ad9..982d50e 100644
--- a/python/commands/wire_manager.py
+++ b/python/commands/wire_manager.py
@@ -8,6 +8,7 @@ manipulate the .kicad_sch file directly.
 
 import logging
 import math
+import re
 import tempfile
 import uuid
 from pathlib import Path
@@ -31,6 +32,90 @@ _SYM_UUID = Symbol("uuid")
 _SYM_SHEET_INSTANCES = Symbol("sheet_instances")
 
 
+def _find_insertion_point(content: str) -> int:
+    """Find the right place to insert new elements in a .kicad_sch file.
+
+    Looks for (sheet_instances (KiCad 8) first, falls back to inserting
+    before the final closing paren (KiCad 9+).
+    """
+    marker = "(sheet_instances"
+    pos = content.rfind(marker)
+    if pos != -1:
+        return pos
+    pos = content.rfind(")")
+    if pos == -1:
+        raise ValueError("Could not find insertion point in schematic")
+    return pos
+
+
+def _text_insert(file_path: Path, sexp_text: str) -> bool:
+    """Insert S-expression text into a .kicad_sch file preserving formatting."""
+    with open(file_path, "r", encoding="utf-8") as f:
+        content = f.read()
+
+    insert_at = _find_insertion_point(content)
+    content = content[:insert_at] + sexp_text + content[insert_at:]
+
+    with open(file_path, "w", encoding="utf-8") as f:
+        f.write(content)
+    return True
+
+
+def _make_hierarchical_label_text(
+    text: str,
+    position: List[float],
+    shape: str = "bidirectional",
+    orientation: int = 0,
+) -> str:
+    """Generate a hierarchical_label S-expression as formatted text.
+
+    orientation: 0=right (label points right, justify left),
+                 180=left (label points left, justify right),
+                 90/270=vertical.
+    """
+    uid = str(uuid.uuid4())
+    justify = "right" if orientation == 180 else "left"
+    return (
+        f'\t(hierarchical_label "{text}"\n'
+        f"\t\t(shape {shape})\n"
+        f"\t\t(at {position[0]} {position[1]} {orientation})\n"
+        f"\t\t(effects\n"
+        f"\t\t\t(font\n"
+        f"\t\t\t\t(size 1.27 1.27)\n"
+        f"\t\t\t)\n"
+        f"\t\t\t(justify {justify})\n"
+        f"\t\t)\n"
+        f'\t\t(uuid "{uid}")\n'
+        f"\t)\n"
+    )
+
+
+def _make_sheet_pin_text(
+    pin_name: str,
+    pin_type: str,
+    position: List[float],
+    orientation: int = 0,
+) -> str:
+    """Generate a sheet pin S-expression as formatted text (indented for inside sheet block).
+
+    orientation: 0=right side of sheet box, 180=left side.
+    """
+    uid = str(uuid.uuid4())
+    justify = "left" if orientation == 0 else "right"
+    return (
+        f'\t\t(pin "{pin_name}" {pin_type}\n'
+        f"\t\t\t(at {position[0]} {position[1]} {orientation})\n"
+        f'\t\t\t(uuid "{uid}")\n'
+        f"\t\t\t(effects\n"
+        f"\t\t\t\t(font\n"
+        f"\t\t\t\t\t(size 1.27 1.27)\n"
+        f"\t\t\t\t)\n"
+        f"\t\t\t\t(justify {justify})\n"
+        f"\t\t\t)\n"
+        f"\t\t)\n"
+    )
+
+
 class WireManager:
     """Manage wires in KiCad schematics using S-expression manipulation"""
 
@@ -669,6 +754,78 @@ class WireManager:
 
         return [start, corner, end]
 
+    @staticmethod
+    def add_hierarchical_label(
+        schematic_path: Path,
+        text: str,
+        position: List[float],
+        shape: str = "bidirectional",
+        orientation: int = 0,
+    ) -> bool:
+        """Add a hierarchical label to a sub-sheet schematic."""
+        try:
+            label_text = _make_hierarchical_label_text(text, position, shape, orientation)
+            _text_insert(schematic_path, label_text)
+            logger.info(f"Added hierarchical_label '{text}' at {position} shape={shape}")
+            return True
+        except Exception as e:
+            logger.error(f"Error adding hierarchical label: {e}")
+            import traceback
+
+            logger.error(traceback.format_exc())
+            return False
+
+    @staticmethod
+    def add_sheet_pin(
+        content: str,
+        sheet_name: str,
+        pin_name: str,
+        pin_type: str,
+        position: List[float],
+        orientation: int = 0,
+    ) -> Tuple[str, bool]:
+        """Insert a sheet pin into the named sheet block in the parent schematic.
+
+        Returns (modified_content, success).
+        """
+        lines = content.split("\n")
+        sheetname_pattern = re.compile(
+            r'\(property\s+"Sheetname"\s+"' + re.escape(sheet_name) + r'"'
+        )
+        sheet_block_pattern = re.compile(r"^\t\(sheet\b")
+
+        # Find the sheet block that contains the target Sheetname property
+        i = 0
+        while i < len(lines):
+            if sheet_block_pattern.match(lines[i]):
+                # Walk forward to find closing paren of this block
+                depth = sum(1 for c in lines[i] if c == "(") - sum(1 for c in lines[i] if c == ")")
+                j = i + 1
+                found_name = False
+                while j < len(lines) and depth > 0:
+                    if sheetname_pattern.search(lines[j]):
+                        found_name = True
+                    depth += sum(1 for c in lines[j] if c == "(") - sum(
+                        1 for c in lines[j] if c == ")"
+                    )
+                    j += 1
+                b_end = j - 1  # index of closing ")" line of the sheet block
+
+                if found_name:
+                    # Insert pin text before the closing paren of the sheet block
+                    pin_text = _make_sheet_pin_text(pin_name, pin_type, position, orientation)
+                    pin_lines = pin_text.rstrip("\n").split("\n")
+                    for offset, line in enumerate(pin_lines):
+                        lines.insert(b_end + offset, line)
+                    logger.info(f"Added sheet pin '{pin_name}' to sheet '{sheet_name}'")
+                    return "\n".join(lines), True
+
+                i = b_end + 1
+                continue
+            i += 1
+
+        return content, False
+
 
 if __name__ == "__main__":
     # Test wire creation
diff --git a/python/kicad_interface.py b/python/kicad_interface.py
index dcd6a1e..229bc50 100644
--- a/python/kicad_interface.py
+++ b/python/kicad_interface.py
@@ -408,6 +408,8 @@ class KiCADInterface:
             "find_orphaned_wires": self._handle_find_orphaned_wires,
             "list_floating_labels": self._handle_list_floating_labels,
             "snap_to_grid": self._handle_snap_to_grid,
+            "add_schematic_hierarchical_label": self._handle_add_schematic_hierarchical_label,
+            "add_sheet_pin": self._handle_add_sheet_pin,
             "import_svg_logo": self._handle_import_svg_logo,
             # UI/Process management commands
             "check_kicad_ui": self._handle_check_kicad_ui,
@@ -2622,6 +2624,126 @@ class KiCADInterface:
             logger.error(traceback.format_exc())
             return {"success": False, "message": str(e)}
 
+    def _handle_add_schematic_hierarchical_label(self, params: Dict[str, Any]) -> Dict[str, Any]:
+        """Add a hierarchical label to a sub-sheet schematic."""
+        logger.info("Adding hierarchical label to schematic")
+        try:
+            from commands.wire_manager import WireManager
+
+            schematic_path = params.get("schematicPath")
+            text = params.get("text")
+            position = params.get("position")
+            shape = params.get("shape", "bidirectional")
+            orientation = params.get("orientation", 0)
+
+            if not schematic_path:
+                return {"success": False, "message": "schematicPath is required"}
+            if not text:
+                return {"success": False, "message": "text is required"}
+            if not position or len(position) != 2:
+                return {"success": False, "message": "position [x, y] is required"}
+            if shape not in ("input", "output", "bidirectional"):
+                return {
+                    "success": False,
+                    "message": "shape must be input, output, or bidirectional",
+                }
+
+            sch_file = Path(schematic_path)
+            if not sch_file.exists():
+                return {
+                    "success": False,
+                    "message": f"Schematic not found: {schematic_path}",
+                }
+
+            success = WireManager.add_hierarchical_label(
+                sch_file, text, position, shape=shape, orientation=orientation
+            )
+
+            if success:
+                return {
+                    "success": True,
+                    "message": (
+                        f"Added hierarchical_label '{text}' " f"at {position} shape={shape}"
+                    ),
+                }
+            return {"success": False, "message": "Failed to add hierarchical label"}
+
+        except Exception as e:
+            logger.error(f"Error adding hierarchical label: {e}")
+            import traceback
+
+            logger.error(traceback.format_exc())
+            return {"success": False, "message": str(e)}
+
+    def _handle_add_sheet_pin(self, params: Dict[str, Any]) -> Dict[str, Any]:
+        """Add a sheet pin to a sheet block on the parent schematic."""
+        logger.info("Adding sheet pin to schematic")
+        try:
+            from commands.wire_manager import WireManager
+
+            schematic_path = params.get("schematicPath")
+            sheet_name = params.get("sheetName")
+            pin_name = params.get("pinName")
+            pin_type = params.get("pinType", "bidirectional")
+            position = params.get("position")
+            orientation = params.get("orientation", 0)
+
+            if not schematic_path:
+                return {"success": False, "message": "schematicPath is required"}
+            if not sheet_name:
+                return {"success": False, "message": "sheetName is required"}
+            if not pin_name:
+                return {"success": False, "message": "pinName is required"}
+            if not position or len(position) != 2:
+                return {"success": False, "message": "position [x, y] is required"}
+            if pin_type not in ("input", "output", "bidirectional"):
+                return {
+                    "success": False,
+                    "message": "pinType must be input, output, or bidirectional",
+                }
+
+            sch_file = Path(schematic_path)
+            if not sch_file.exists():
+                return {
+                    "success": False,
+                    "message": f"Schematic not found: {schematic_path}",
+                }
+
+            with open(sch_file, "r", encoding="utf-8") as f:
+                content = f.read()
+
+            modified, success = WireManager.add_sheet_pin(
+                content,
+                sheet_name,
+                pin_name,
+                pin_type,
+                position,
+                orientation=orientation,
+            )
+
+            if not success:
+                return {
+                    "success": False,
+                    "message": f"Sheet '{sheet_name}' not found in {schematic_path}",
+                }
+
+            with open(sch_file, "w", encoding="utf-8") as f:
+                f.write(modified)
+
+            return {
+                "success": True,
+                "message": (
+                    f"Added sheet pin '{pin_name}' ({pin_type}) " f"to sheet '{sheet_name}'"
+                ),
+            }
+
+        except Exception as e:
+            logger.error(f"Error adding sheet pin: {e}")
+            import traceback
+
+            logger.error(traceback.format_exc())
+            return {"success": False, "message": str(e)}
+
     def _handle_run_erc(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Run Electrical Rules Check on a schematic via kicad-cli"""
         logger.info("Running ERC on schematic")
diff --git a/src/tools/schematic.ts b/src/tools/schematic.ts
index 3e8b63d..f234591 100644
--- a/src/tools/schematic.ts
+++ b/src/tools/schematic.ts
@@ -1524,4 +1524,125 @@ Note: operates on .kicad_sch files only. To modify a PCB footprint use edit_comp
       }
     },
   );
+
+  // Add hierarchical label to a sub-sheet
+  server.tool(
+    "add_schematic_hierarchical_label",
+    "Add a hierarchical label (sheet interface port) to a sub-sheet schematic. " +
+      "Hierarchical labels are the connection points that link a sub-sheet to its " +
+      "parent via sheet pins. The label text must exactly match the corresponding " +
+      "sheet pin name.",
+    {
+      schematicPath: z.string().describe("Path to the sub-sheet .kicad_sch file"),
+      text: z
+        .string()
+        .describe("Label text (e.g. 'SD_CLK') — must match the sheet pin name"),
+      position: z
+        .array(z.number())
+        .length(2)
+        .describe("Position [x, y] in mm"),
+      shape: z
+        .enum(["input", "output", "bidirectional"])
+        .describe("Signal direction from the sub-sheet's perspective"),
+      orientation: z
+        .number()
+        .optional()
+        .describe(
+          "Rotation in degrees: 0=label points right, 180=label points left (default: 0)",
+        ),
+    },
+    async (args: {
+      schematicPath: string;
+      text: string;
+      position: number[];
+      shape: "input" | "output" | "bidirectional";
+      orientation?: number;
+    }) => {
+      const result = await callKicadScript("add_schematic_hierarchical_label", args);
+      if (result.success) {
+        return {
+          content: [
+            {
+              type: "text" as const,
+              text: result.message || `Added hierarchical label '${args.text}'`,
+            },
+          ],
+        };
+      }
+      return {
+        content: [
+          {
+            type: "text" as const,
+            text: `Failed to add hierarchical label: ${result.message || "Unknown error"}`,
+          },
+        ],
+      };
+    },
+  );
+
+  // Add sheet pin to a sheet block on the parent schematic
+  server.tool(
+    "add_sheet_pin",
+    "Add a pin to a sheet symbol block on the parent schematic. Sheet pins are the " +
+      "parent-side connection points that correspond to hierarchical labels in the " +
+      "sub-sheet. The pinName must exactly match a hierarchical_label in the sub-sheet.",
+    {
+      schematicPath: z.string().describe("Path to the PARENT .kicad_sch file"),
+      sheetName: z
+        .string()
+        .describe(
+          "Sheet name as it appears in the Sheetname property (e.g. 'Storage')",
+        ),
+      pinName: z
+        .string()
+        .describe("Pin name — must match a hierarchical_label in the sub-sheet"),
+      pinType: z
+        .enum(["input", "output", "bidirectional"])
+        .describe(
+          "Signal direction (should match the sub-sheet hierarchical label shape)",
+        ),
+      position: z
+        .array(z.number())
+        .length(2)
+        .describe(
+          "Pin position [x, y] in mm — must be on the sheet block boundary",
+        ),
+      orientation: z
+        .number()
+        .optional()
+        .describe(
+          "Pin orientation: 0=right edge of sheet box, 180=left edge (default: 0)",
+        ),
+    },
+    async (args: {
+      schematicPath: string;
+      sheetName: string;
+      pinName: string;
+      pinType: "input" | "output" | "bidirectional";
+      position: number[];
+      orientation?: number;
+    }) => {
+      const result = await callKicadScript("add_sheet_pin", args);
+      if (result.success) {
+        return {
+          content: [
+            {
+              type: "text" as const,
+              text:
+                result.message ||
+                `Added sheet pin '${args.pinName}' to sheet '${args.sheetName}'`,
+            },
+          ],
+        };
+      }
+      return {
+        content: [
+          {
+            type: "text" as const,
+            text: `Failed to add sheet pin: ${result.message || "Unknown error"}`,
+          },
+        ],
+      };
+    },
+  );
 }
diff --git a/tests/test_hierarchy_tools.py b/tests/test_hierarchy_tools.py
new file mode 100644
index 0000000..fc5dcb6
--- /dev/null
+++ b/tests/test_hierarchy_tools.py
@@ -0,0 +1,349 @@
+"""
+Tests for add_schematic_hierarchical_label and add_sheet_pin tools.
+
+Covers:
+  - Hierarchical label insertion with correct S-expression format
+  - Sheet pin insertion into the correct sheet block
+  - Parameter validation (missing required fields)
+  - Orientation and justification mapping
+  - Sheet-not-found error handling
+"""
+
+import sys
+import textwrap
+from pathlib import Path
+from typing import Any
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+sys.path.insert(0, str(Path(__file__).parent.parent / "python"))
+
+
+# ---------------------------------------------------------------------------
+# Shared fixture
+# ---------------------------------------------------------------------------
+
+
+def _make_iface() -> Any:
+    with patch("kicad_interface.USE_IPC_BACKEND", False):
+        from kicad_interface import KiCADInterface
+
+        iface = KiCADInterface.__new__(KiCADInterface)
+    return iface
+
+
+@pytest.fixture()
+def iface():
+    return _make_iface()
+
+
+# ---------------------------------------------------------------------------
+# Minimal schematic templates
+# ---------------------------------------------------------------------------
+
+_MINIMAL_SUBSHEET = textwrap.dedent("""\
+    (kicad_sch
+    \t(version 20231120)
+    \t(generator "eeschema")
+    \t(generator_version "9.0")
+    \t(sheet_instances
+    \t\t(path "/"
+    \t\t\t(page "1")
+    \t\t)
+    \t)
+    )
+""")
+
+_MINIMAL_PARENT = textwrap.dedent("""\
+    (kicad_sch
+    \t(version 20231120)
+    \t(generator "eeschema")
+    \t(sheet
+    \t\t(at 100 50)
+    \t\t(size 40 30)
+    \t\t(property "Sheetname" "Storage"
+    \t\t\t(at 100 49 0)
+    \t\t\t(effects
+    \t\t\t\t(font
+    \t\t\t\t\t(size 1.27 1.27)
+    \t\t\t\t)
+    \t\t\t)
+    \t\t)
+    \t\t(property "Sheetfile" "sheets/storage.kicad_sch"
+    \t\t\t(at 100 82 0)
+    \t\t\t(effects
+    \t\t\t\t(font
+    \t\t\t\t\t(size 1.27 1.27)
+    \t\t\t\t)
+    \t\t\t)
+    \t\t)
+    \t)
+    \t(sheet_instances
+    \t\t(path "/"
+    \t\t\t(page "1")
+    \t\t)
+    \t)
+    )
+""")
+
+_PARENT_TWO_SHEETS = textwrap.dedent("""\
+    (kicad_sch
+    \t(version 20231120)
+    \t(sheet
+    \t\t(at 50 50)
+    \t\t(size 40 30)
+    \t\t(property "Sheetname" "Power"
+    \t\t\t(at 50 49 0)
+    \t\t\t(effects (font (size 1.27 1.27)))
+    \t\t)
+    \t\t(property "Sheetfile" "sheets/power.kicad_sch"
+    \t\t\t(at 50 82 0)
+    \t\t\t(effects (font (size 1.27 1.27)))
+    \t\t)
+    \t)
+    \t(sheet
+    \t\t(at 150 50)
+    \t\t(size 40 30)
+    \t\t(property "Sheetname" "Storage"
+    \t\t\t(at 150 49 0)
+    \t\t\t(effects (font (size 1.27 1.27)))
+    \t\t)
+    \t\t(property "Sheetfile" "sheets/storage.kicad_sch"
+    \t\t\t(at 150 82 0)
+    \t\t\t(effects (font (size 1.27 1.27)))
+    \t\t)
+    \t)
+    \t(sheet_instances
+    \t\t(path "/" (page "1"))
+    \t)
+    )
+""")
+
+
+# ===========================================================================
+# Hierarchical label tests
+# ===========================================================================
+
+
+@pytest.mark.unit
+class TestAddHierarchicalLabel:
+    def test_inserts_label_into_subsheet(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "text": "SD_CLK",
+                "position": [50.8, 25.4],
+                "shape": "output",
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        assert '(hierarchical_label "SD_CLK"' in content
+        assert "(shape output)" in content
+        assert "(at 50.8 25.4 0)" in content
+
+    def test_orientation_180_uses_right_justify(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "text": "VBUS",
+                "position": [10, 20],
+                "shape": "input",
+                "orientation": 180,
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        assert "(at 10 20 180)" in content
+        assert "(justify right)" in content
+
+    def test_orientation_0_uses_left_justify(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "text": "SDA",
+                "position": [30, 40],
+                "shape": "bidirectional",
+                "orientation": 0,
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        assert "(justify left)" in content
+
+    def test_missing_text_fails(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "position": [10, 20],
+                "shape": "input",
+            }
+        )
+
+        assert result["success"] is False
+        assert "text" in result["message"].lower()
+
+    def test_invalid_shape_fails(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "text": "SIG",
+                "position": [10, 20],
+                "shape": "passive",
+            }
+        )
+
+        assert result["success"] is False
+
+    def test_nonexistent_file_fails(self, iface, tmp_path):
+        result = iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(tmp_path / "nope.kicad_sch"),
+                "text": "SIG",
+                "position": [10, 20],
+                "shape": "input",
+            }
+        )
+
+        assert result["success"] is False
+        assert "not found" in result["message"].lower()
+
+    def test_inserts_before_sheet_instances(self, iface, tmp_path):
+        sch = tmp_path / "sub.kicad_sch"
+        sch.write_text(_MINIMAL_SUBSHEET)
+
+        iface._handle_add_schematic_hierarchical_label(
+            {
+                "schematicPath": str(sch),
+                "text": "TEST",
+                "position": [10, 20],
+                "shape": "input",
+            }
+        )
+
+        content = sch.read_text()
+        label_pos = content.find("hierarchical_label")
+        instances_pos = content.find("sheet_instances")
+        assert (
+            label_pos < instances_pos
+        ), "Hierarchical label should be inserted before sheet_instances"
+
+
+# ===========================================================================
+# Sheet pin tests
+# ===========================================================================
+
+
+@pytest.mark.unit
+class TestAddSheetPin:
+    def test_inserts_pin_into_correct_sheet(self, iface, tmp_path):
+        sch = tmp_path / "parent.kicad_sch"
+        sch.write_text(_MINIMAL_PARENT)
+
+        result = iface._handle_add_sheet_pin(
+            {
+                "schematicPath": str(sch),
+                "sheetName": "Storage",
+                "pinName": "SD_CLK",
+                "pinType": "output",
+                "position": [140, 60],
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        assert '(pin "SD_CLK" output' in content
+        assert "(at 140 60 0)" in content
+
+    def test_pin_in_multi_sheet_parent_targets_correct_sheet(self, iface, tmp_path):
+        sch = tmp_path / "parent.kicad_sch"
+        sch.write_text(_PARENT_TWO_SHEETS)
+
+        result = iface._handle_add_sheet_pin(
+            {
+                "schematicPath": str(sch),
+                "sheetName": "Storage",
+                "pinName": "SD_D0",
+                "pinType": "bidirectional",
+                "position": [190, 60],
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        # Pin should be inside the Storage sheet block, not the Power block
+        storage_pos = content.find('"Storage"')
+        pin_pos = content.find('"SD_D0"')
+        power_end = content.find('"Power"')
+        assert pin_pos > storage_pos, "Pin should be after Storage sheet name"
+
+    def test_sheet_not_found_fails(self, iface, tmp_path):
+        sch = tmp_path / "parent.kicad_sch"
+        sch.write_text(_MINIMAL_PARENT)
+
+        result = iface._handle_add_sheet_pin(
+            {
+                "schematicPath": str(sch),
+                "sheetName": "NonExistent",
+                "pinName": "SIG",
+                "pinType": "input",
+                "position": [100, 50],
+            }
+        )
+
+        assert result["success"] is False
+        assert "not found" in result["message"].lower()
+
+    def test_missing_pin_name_fails(self, iface, tmp_path):
+        sch = tmp_path / "parent.kicad_sch"
+        sch.write_text(_MINIMAL_PARENT)
+
+        result = iface._handle_add_sheet_pin(
+            {
+                "schematicPath": str(sch),
+                "sheetName": "Storage",
+                "pinType": "input",
+                "position": [100, 50],
+            }
+        )
+
+        assert result["success"] is False
+
+    def test_orientation_180_uses_right_justify(self, iface, tmp_path):
+        sch = tmp_path / "parent.kicad_sch"
+        sch.write_text(_MINIMAL_PARENT)
+
+        result = iface._handle_add_sheet_pin(
+            {
+                "schematicPath": str(sch),
+                "sheetName": "Storage",
+                "pinName": "VBUS",
+                "pinType": "input",
+                "position": [100, 60],
+                "orientation": 180,
+            }
+        )
+
+        assert result["success"] is True
+        content = sch.read_text()
+        assert "(at 100 60 180)" in content
+        assert "(justify right)" in content