diff --git a/GramAddict/core/goap.py b/GramAddict/core/goap.py
index 3e3c745..8f7cae1 100644
--- a/GramAddict/core/goap.py
+++ b/GramAddict/core/goap.py
@@ -758,7 +758,14 @@ class GoalPlanner:
         selected_tab: Optional[str] = None,
         explored_nav_actions: set = None,
     ) -> Optional[str]:
-        """If we're on the wrong screen, figure out how to navigate."""
+        """If we're on the wrong screen, figure out how to navigate.
+
+        Strategy (priority order):
+        1. HD Map (ScreenTopology BFS) — deterministic, pre-computed routes
+        2. Learned Knowledge (Qdrant) — dynamic discovery from past sessions
+        3. Autonomous Discovery — linguistic matching + VLM intent
+        """
+        from GramAddict.core.screen_topology import ScreenTopology
 
         # 0. Aversive Filter: Remove known traps from available actions
         safe_available = []
@@ -769,10 +776,30 @@ class GoalPlanner:
                 logger.debug(f"🛡️ [Aversive Filter] Masking trapped action: '{action}'")
         available = safe_available
 
-        # 1. Get required screens for this goal from knowledge
+        # ── 1. HD Map Routing (Primary Strategy) ──
+        target_screen = ScreenTopology.goal_to_target_screen(goal)
+        if target_screen and target_screen != screen_type:
+            route = ScreenTopology.find_route(screen_type, target_screen)
+            if route:
+                next_action, next_screen = route[0]
+                # Verify action isn't explored/trapped
+                if next_action not in (explored_nav_actions or set()):
+                    if not self.knowledge.is_trap(screen_type, next_action):
+                        route_desc = " → ".join(s.name for _, s in route)
+                        logger.info(
+                            f"🗺️ [HD Map] Route: {screen_type.name} → {route_desc}. "
+                            f"Next action: '{next_action}'"
+                        )
+                        return next_action
+                    else:
+                        logger.warning(f"🛡️ [HD Map] Route action '{next_action}' is trapped. Falling back.")
+                else:
+                    logger.debug(f"🛡️ [HD Map] Route action '{next_action}' already explored. Falling back.")
+
+        # ── 2. Learned Knowledge (Qdrant) ──
         required_screens = self.knowledge.get_requirements(goal)
 
-        # 2. Blank Start Discovery (if knowledge is empty)
+        # ── 3. Autonomous Discovery (Blank Start fallback) ──
         if not required_screens:
             logger.info(f"🧠 [Nav Discovery] No known requirements for '{goal}'. Will attempt autonomous discovery.")
 
@@ -784,15 +811,12 @@ class GoalPlanner:
 
             for action in available:
                 if any(w in action.lower() for w in goal_words):
-                    # Ensure it doesn't lead to a completely contradictory known state (if we knew the target).
-                    # But since we are in a blank start, any linguistic match is a highly probable path!
                     logger.info(
                         f"🎯 [Nav Discovery] Linguistic match on available action! '{action}' aligns with '{goal}'"
                     )
                     return action
 
-            # We don't know the required screen or path. Let the TelepathicEngine figure out
-            # what button to press based on the pure goal text!
+            # Return raw intent for TelepathicEngine discovery
             if explored_nav_actions and goal in explored_nav_actions:
                 logger.info(
                     f"🛑 [Nav Discovery] Autonomous intent '{goal}' already tried and failed/trapped. Yielding to back-tracking."
@@ -801,37 +825,31 @@ class GoalPlanner:
             else:
                 return goal
 
-        # 3. If we're already on an acceptable screen, no navigation needed
+        # 4. If we're already on an acceptable screen, no navigation needed
         if screen_type in required_screens:
             return None
 
-        # 4. Find the action we need to take
+        # 5. Find the action we need to take (from learned knowledge)
         for target_screen in required_screens:
             known_action = self.knowledge.get_action_for_screen(target_screen)
 
             if not known_action:
                 logger.info(f"🧭 [Nav Discovery] Don't know action to reach {target_screen.name}. Asking VLM...")
 
-                # Check ALL available actions if one linguistically aligns with the target screen
-                # Or just let VLM figure it out by returning an intention.
                 screen_friendly_name = target_screen.name.replace("_", " ").lower()
-
-                # Semantic Heuristic Match on dynamically perceived actions
                 goal_words = [w.rstrip("s") for w in screen_friendly_name.split() if len(w) > 3]
 
                 for action in available:
                     if any(w in action.lower() for w in goal_words):
-                        # Verify we don't know this leads somewhere else
                         known_target = self.knowledge.get_screen_for_action(action)
                         if known_target and known_target != target_screen:
-                            continue  # Trap prevention
+                            continue
 
                         logger.info(
                             f"🎯 [Nav Discovery] Linguistic match on available action! '{action}' aligns with '{screen_friendly_name}'"
                         )
                         return action
 
-                # If no perceived action matches, return intent for TelepathicEngine
                 return f"navigate to {screen_friendly_name}"
             else:
                 if known_action in available:
@@ -840,7 +858,6 @@ class GoalPlanner:
 
         # If no targeted navigation works, try going back first
         if "press back" in available:
-            # Only press back if we aren't currently on the required screen (handled in step 3)
             return "press back"
 
         return None
diff --git a/GramAddict/core/q_nav_graph.py b/GramAddict/core/q_nav_graph.py
index 7cb96bf..bc680fe 100644
--- a/GramAddict/core/q_nav_graph.py
+++ b/GramAddict/core/q_nav_graph.py
@@ -9,6 +9,7 @@ from GramAddict.core.compiler_engine import VLMCompilerEngine
 from GramAddict.core.qdrant_memory import NavigationMemoryDB
 from GramAddict.core.situational_awareness import SituationalAwarenessEngine, SituationType
 from GramAddict.core.goap import GoalExecutor, ScreenType
+from GramAddict.core.screen_topology import ScreenTopology
 
 
 logger = logging.getLogger(__name__)
@@ -37,18 +38,34 @@ class QNavGraph:
 
 
     def _load_graph(self):
-        """Loads the topological map from Qdrant. Merges with core seeds to guarantee baseline navigation."""
+        """Loads the topological map from Qdrant. Merges with core seeds from ScreenTopology (SSOT)."""
         logger.debug("🌐 [NavGraph] Syncing topological map with Qdrant...")
         self.nodes = self.nav_memory.get_all_transitions()
-        
-        core_nodes = {
-            "HomeFeed": {"transitions": {"tap_explore_tab": "ExploreFeed", "tap_profile_tab": "OwnProfile", "tap_message_icon": "MessageInbox"}},
-            "ExploreFeed": {"transitions": {"tap_home_tab": "HomeFeed"}},
-            "OwnProfile": {"transitions": {"tap_home_tab": "HomeFeed", "tap_following_list": "FollowingList"}},
-            "MessageInbox": {"transitions": {"tap_back": "HomeFeed"}},
-            "FollowingList": {"transitions": {"tap_back": "OwnProfile"}},
-            "UNKNOWN": {"transitions": {"tap_home_tab": "HomeFeed"}}
-        }
+
+        # Generate core_nodes from ScreenTopology (single source of truth)
+        core_nodes = {}
+        for screen_type, transitions in ScreenTopology.TRANSITIONS.items():
+            # Map ScreenType enum names to QNavGraph string names
+            screen_name_map = {
+                ScreenType.HOME_FEED: "HomeFeed",
+                ScreenType.EXPLORE_GRID: "ExploreFeed",
+                ScreenType.REELS_FEED: "ReelsFeed",
+                ScreenType.OWN_PROFILE: "OwnProfile",
+                ScreenType.DM_INBOX: "MessageInbox",
+                ScreenType.FOLLOW_LIST: "FollowingList",
+                ScreenType.OTHER_PROFILE: "OtherProfile",
+                ScreenType.UNKNOWN: "UNKNOWN",
+            }
+            node_name = screen_name_map.get(screen_type)
+            if not node_name:
+                continue
+            node_transitions = {}
+            for action, target_screen in transitions.items():
+                # Convert action format: "tap profile tab" → "tap_profile_tab"
+                action_key = action.replace(" ", "_")
+                target_name = screen_name_map.get(target_screen, target_screen.name)
+                node_transitions[action_key] = target_name
+            core_nodes[node_name] = {"transitions": node_transitions}
 
         # Merge core nodes into loaded nodes
         for node, data in core_nodes.items():
@@ -135,25 +152,29 @@ class QNavGraph:
         return self.goap._execute_action(goal)
 
     def _find_path(self, start: str, end: str):
-        if start == end: return []
-        if start not in self.nodes: return None
-        
-        queue = [(start, [])]
-        visited = set()
-        
-        while queue:
-            current, path = queue.pop(0)
-            if current == end:
-                return path
-                
-            visited.add(current)
-            transitions = self.nodes.get(current, {}).get("transitions", {})
-            
-            for action, next_state in transitions.items():
-                if next_state not in visited:
-                    queue.append((next_state, path + [action]))
-                    
-        return None
+        """Delegates to ScreenTopology for BFS pathfinding (SSOT)."""
+        # Map string names to ScreenType for ScreenTopology
+        name_to_screen = {
+            "HomeFeed": ScreenType.HOME_FEED,
+            "ExploreFeed": ScreenType.EXPLORE_GRID,
+            "ReelsFeed": ScreenType.REELS_FEED,
+            "OwnProfile": ScreenType.OWN_PROFILE,
+            "MessageInbox": ScreenType.DM_INBOX,
+            "FollowingList": ScreenType.FOLLOW_LIST,
+            "OtherProfile": ScreenType.OTHER_PROFILE,
+            "UNKNOWN": ScreenType.UNKNOWN,
+        }
+        from_screen = name_to_screen.get(start)
+        to_screen = name_to_screen.get(end)
+        if not from_screen or not to_screen:
+            return None
+
+        route = ScreenTopology.find_route(from_screen, to_screen)
+        if route is None:
+            return None
+
+        # Convert back to QNavGraph action format: "tap profile tab" → "tap_profile_tab"
+        return [action.replace(" ", "_") for action, _ in route]
 
     def _clear_anomaly_obstacles(self, max_attempts=2, xml_dump: str = None) -> bool:
         """
diff --git a/GramAddict/core/screen_topology.py b/GramAddict/core/screen_topology.py
new file mode 100644
index 0000000..04debcd
--- /dev/null
+++ b/GramAddict/core/screen_topology.py
@@ -0,0 +1,135 @@
+"""
+ScreenTopology — The Instagram HD Map
+
+Pure-data BFS pathfinding between Instagram screen states.
+Zero dependencies on device, VLM, Qdrant, or any runtime state.
+
+This is the bot's GPS: it knows HOW to get from screen A to screen B
+before the bot starts moving. The GOAP planner consults this map
+as its primary routing strategy.
+"""
+from collections import deque
+from enum import Enum
+from typing import Dict, List, Optional, Tuple
+
+from GramAddict.core.goap import ScreenType
+
+
+class ScreenTopology:
+    """
+    Topological HD Map of Instagram's screen graph.
+
+    Provides BFS pathfinding between any two ScreenTypes.
+    All transitions use the same action string format as
+    the TelepathicEngine intent system — no translation needed.
+    """
+
+    # ── The Map: ScreenType → {action_string → ScreenType} ──
+    # These are structural facts about Instagram's UI, not learned behavior.
+    # They survive blank_start because they describe the app's architecture.
+    TRANSITIONS: Dict[ScreenType, Dict[str, ScreenType]] = {
+        ScreenType.HOME_FEED: {
+            "tap explore tab": ScreenType.EXPLORE_GRID,
+            "tap profile tab": ScreenType.OWN_PROFILE,
+            "tap reels tab": ScreenType.REELS_FEED,
+            "tap messages tab": ScreenType.DM_INBOX,
+        },
+        ScreenType.EXPLORE_GRID: {
+            "tap home tab": ScreenType.HOME_FEED,
+            "tap profile tab": ScreenType.OWN_PROFILE,
+            "tap reels tab": ScreenType.REELS_FEED,
+        },
+        ScreenType.REELS_FEED: {
+            "tap home tab": ScreenType.HOME_FEED,
+            "tap explore tab": ScreenType.EXPLORE_GRID,
+            "tap profile tab": ScreenType.OWN_PROFILE,
+        },
+        ScreenType.OWN_PROFILE: {
+            "tap home tab": ScreenType.HOME_FEED,
+            "tap explore tab": ScreenType.EXPLORE_GRID,
+            "tap reels tab": ScreenType.REELS_FEED,
+            "tap following list": ScreenType.FOLLOW_LIST,
+        },
+        ScreenType.DM_INBOX: {
+            "press back": ScreenType.HOME_FEED,
+        },
+        ScreenType.FOLLOW_LIST: {
+            "press back": ScreenType.OWN_PROFILE,
+        },
+        ScreenType.OTHER_PROFILE: {
+            "press back": ScreenType.HOME_FEED,
+            "tap home tab": ScreenType.HOME_FEED,
+        },
+        ScreenType.UNKNOWN: {
+            "tap home tab": ScreenType.HOME_FEED,
+        },
+    }
+
+    # ── Goal → ScreenType mapping ──
+    # Maps natural-language goals to their target screen.
+    _GOAL_MAP: Dict[str, ScreenType] = {
+        "open home feed": ScreenType.HOME_FEED,
+        "open home": ScreenType.HOME_FEED,
+        "open explore feed": ScreenType.EXPLORE_GRID,
+        "open explore": ScreenType.EXPLORE_GRID,
+        "open reels": ScreenType.REELS_FEED,
+        "open profile": ScreenType.OWN_PROFILE,
+        "learn own profile": ScreenType.OWN_PROFILE,
+        "open messages": ScreenType.DM_INBOX,
+        "open following list": ScreenType.FOLLOW_LIST,
+        "open followers list": ScreenType.FOLLOW_LIST,
+    }
+
+    @classmethod
+    def find_route(
+        cls, from_screen: ScreenType, to_screen: ScreenType
+    ) -> Optional[List[Tuple[str, ScreenType]]]:
+        """
+        BFS shortest path from from_screen to to_screen.
+
+        Returns:
+            [] if already there,
+            [(action, resulting_screen), ...] for a path,
+            None if unreachable.
+        """
+        if from_screen == to_screen:
+            return []
+
+        queue: deque = deque()
+        queue.append((from_screen, []))
+        visited = {from_screen}
+
+        while queue:
+            current, path = queue.popleft()
+            transitions = cls.TRANSITIONS.get(current, {})
+
+            for action, next_screen in transitions.items():
+                if next_screen == to_screen:
+                    return path + [(action, next_screen)]
+
+                if next_screen not in visited:
+                    visited.add(next_screen)
+                    queue.append((next_screen, path + [(action, next_screen)]))
+
+        return None  # Unreachable
+
+    @classmethod
+    def get_transitions(cls, screen: ScreenType) -> Dict[str, ScreenType]:
+        """Get all known transitions from a screen."""
+        return dict(cls.TRANSITIONS.get(screen, {}))
+
+    @classmethod
+    def goal_to_target_screen(cls, goal: str) -> Optional[ScreenType]:
+        """Map a goal string to its target ScreenType. Returns None for non-navigation goals."""
+        goal_lower = goal.lower().strip()
+
+        # Exact match first
+        if goal_lower in cls._GOAL_MAP:
+            return cls._GOAL_MAP[goal_lower]
+
+        # Substring match for flexibility
+        for key, screen in cls._GOAL_MAP.items():
+            if key in goal_lower:
+                return screen
+
+        return None
diff --git a/GramAddict/core/telepathic_engine.py b/GramAddict/core/telepathic_engine.py
index 4dfd90b..476472b 100644
--- a/GramAddict/core/telepathic_engine.py
+++ b/GramAddict/core/telepathic_engine.py
@@ -24,9 +24,17 @@ MAX_BUTTON_AREA = 150000  # Buttons/icons should be smaller than this (px²)
 MAX_CONTAINER_AREA = 500000  # Anything above this is a full-screen container
 
 # ── Nav Intent Keywords (SSOT — used by all structural guards) ──
-# Any intent containing these keywords is classified as "navigation",
-# allowing the structural guard to accept elements in the nav bar zone.
-NAV_INTENT_KEYWORDS = [
+#
+# TWO purpose-specific sets prevent the Guard Civil War:
+#
+# NAV_ZONE_BYPASS_KEYWORDS: Intents ALLOWED to target elements in the
+#   bottom nav bar zone. Broad — includes tabs, DMs, profile stats.
+#
+# NAV_TAB_KEYWORDS: Intents that REQUIRE their target to be at the bottom.
+#   Narrow — only actual navigation tabs. "following"/"follower" are profile
+#   stats at the TOP of the screen, not tabs.
+
+NAV_ZONE_BYPASS_KEYWORDS = [
     "tab",
     "navigation",
     "reels tab",
@@ -44,6 +52,14 @@ NAV_INTENT_KEYWORDS = [
     "followers",
 ]
 
+NAV_TAB_KEYWORDS = [
+    "reels tab",
+    "profile tab",
+    "home tab",
+    "explore tab",
+    "message tab",
+]
+
 # Cache files
 MEMORY_FILE = "telepathic_memory.json"
 BLACKLIST_FILE = "telepathic_blacklist.json"
@@ -410,7 +426,7 @@ class TelepathicEngine:
 
         # 3. Reject nodes in the Navigation Bar zone (bottom 6% - adjusted for accuracy)
         # UNLESS the intent is explicitly about navigation tabs, profile stats, OR popup modals
-        nav_keywords = NAV_INTENT_KEYWORDS
+        nav_keywords = NAV_ZONE_BYPASS_KEYWORDS
         modal_keywords = ["dismiss", "ok", "cancel", "accept", "allow", "deny", "action", "obstacle", "popup"]
 
         low_intent = intent_description.lower()
@@ -431,12 +447,11 @@ class TelepathicEngine:
         # STRICT NAVIGATION TAB ENFORCEMENT
         # Navigation tabs MUST be at the bottom (>= 0.92 of screen height).
         # We reject any navigation tab hallucinated in the middle of the screen.
-        if is_nav_intent and node.get("y", 0) < screen_height * 0.92:
-            # We must be careful: intent could be "navigate to profile" which means click username
-            # So ONLY block if the intent explicitly says "tab".
-            if "tab" in low_intent:
-                # Silently filter non-bottom elements for navigation intents to prevent log spam
-                return False
+        # STRICT TAB ENFORCEMENT: Only actual tab intents must be at the bottom.
+        is_tab_intent = any(k in low_intent for k in NAV_TAB_KEYWORDS)
+        if is_tab_intent and node.get("y", 0) < screen_height * 0.92:
+            # Silently filter non-bottom elements for tab intents to prevent log spam
+            return False
 
         # STRICT STORY TRAY ENFORCEMENT
         # Story rings MUST be at the top of the screen (y < 30% of screen height).
@@ -685,7 +700,7 @@ class TelepathicEngine:
             # - Navigation intents: Require 100% exact match to avoid feed-cross-talk
             # - Short intents (1-2 words): Require at least 50% hit (0.45)
             # - Longer intents: Require 75% to avoid false matches on noisy screens.
-            is_nav_intent = any(k in intent_lower for k in NAV_INTENT_KEYWORDS)
+            is_nav_intent = any(k in intent_lower for k in NAV_ZONE_BYPASS_KEYWORDS)
             if is_nav_intent:
                 threshold = 1.0
             else:
@@ -939,7 +954,7 @@ class TelepathicEngine:
         # If a bottom sheet or dialog is active, it likely obscures the main navigation tabs.
         # We rely strictly on the SAE (Situational Awareness Engine) for 100% autonomous detection
         # (via Qdrant cache or LLM reasoning) instead of hardcoded resource IDs.
-        is_nav_intent = any(k in intent_lower for k in NAV_INTENT_KEYWORDS)
+        is_nav_intent = any(k in intent_lower for k in NAV_ZONE_BYPASS_KEYWORDS)
         if is_nav_intent and device is not None:
             from GramAddict.core.situational_awareness import SituationalAwarenessEngine, SituationType
 
@@ -2080,15 +2095,14 @@ class TelepathicEngine:
                     )
                     return None
 
-                is_nav_intent = any(k in intent.lower() for k in NAV_INTENT_KEYWORDS)
+                is_nav_intent = any(k in intent.lower() for k in NAV_ZONE_BYPASS_KEYWORDS)
+                is_tab_intent = any(k in intent.lower() for k in NAV_TAB_KEYWORDS)
 
                 # NAVIGATION TAB ENFORCEMENT:
                 # Real navigation tabs (Home, Search, Reels, Store, Profile) are ALWAYS in the bottom zone.
-                # If the bot is looking for a tab, forbid results that are too high up (likely hallucinations on comments/feed).
-                # IMPORTANT: Only enforce for intents explicitly containing "tab".
-                # "following"/"follower" are profile stats at the TOP of the screen, not tabs.
-                # This aligns with _structural_sanity_check which has the same "tab" guard.
-                if is_nav_intent and "tab" in intent.lower():
+                # If the bot is looking for a tab, forbid results that are too high up.
+                # "following"/"follower" are profile stats at the TOP — not tabs.
+                if is_tab_intent:
                     if match.get("y", 0) < screen_height * 0.92:
                         logger.warning(
                             f"🛡️ [Structural Guard] VLM hallucinated a navigation tab '{intent}' "
diff --git a/tests/unit/test_goap_bootstrap.py b/tests/unit/test_goap_bootstrap.py
index 0871d03..e1fdfa9 100644
--- a/tests/unit/test_goap_bootstrap.py
+++ b/tests/unit/test_goap_bootstrap.py
@@ -3,10 +3,12 @@ from unittest.mock import MagicMock
 from GramAddict.core.goap import GoalPlanner, ScreenType
 
 
-def test_goal_planner_linguistic_match_blank_start():
+def test_goal_planner_uses_hd_map_over_linguistic_match():
     """
-    Tests that the GoalPlanner correctly matches a linguistic target
-    during Blank Start discovery without being blocked by a known target check.
+    Tests that the GoalPlanner uses the HD Map (ScreenTopology) as its
+    primary routing strategy, even during Blank Start discovery.
+    The HD Map returns canonical action intents that the TelepathicEngine
+    interprets — not just available_actions from the XML dump.
     """
     planner = GoalPlanner("test_user")
 
@@ -26,4 +28,8 @@ def test_goal_planner_linguistic_match_blank_start():
 
     result = planner.plan_next_step(goal, screen, explored_nav_actions=set())
 
-    assert result == "tap explore grid", "Failed to linguistically match explore during Blank Start"
+    # HD Map routes HOME_FEED → EXPLORE_GRID via "tap explore tab"
+    assert result == "tap explore tab", (
+        f"Expected HD Map to route via 'tap explore tab', got '{result}'. "
+        "The HD Map should override linguistic matching as the primary strategy."
+    )
diff --git a/tests/unit/test_goap_graph_routing.py b/tests/unit/test_goap_graph_routing.py
new file mode 100644
index 0000000..d73c534
--- /dev/null
+++ b/tests/unit/test_goap_graph_routing.py
@@ -0,0 +1,103 @@
+"""
+🔴 RED TDD: GOAP Graph-Aware Routing
+
+The GoalPlanner must use the ScreenTopology HD Map as its PRIMARY
+routing strategy. When asked to reach FollowingList from HomeFeed,
+it should return "tap profile tab" (first step of the BFS route),
+NOT "open following list" (impossible direct action).
+"""
+import pytest
+import sys
+import os
+from unittest.mock import MagicMock
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../")))
+
+from GramAddict.core.goap import GoalPlanner, ScreenType
+
+
+class TestGoapGraphRouting:
+    """GOAP planner must use the HD Map for multi-step navigation."""
+
+    @pytest.fixture
+    def planner(self):
+        p = GoalPlanner("testbot")
+        # Ensure blank start (no learned knowledge)
+        p.knowledge._goal_requirements = {}
+        p.knowledge._learned_screen_mappings = {}
+        p.knowledge._learned_traps = set()
+        return p
+
+    def test_planner_routes_to_profile_first_for_following_list(self, planner):
+        """
+        From HOME_FEED, goal 'open following list' should return
+        'tap profile tab' (navigate to OwnProfile first),
+        NOT 'open following list' as a raw intent.
+        """
+        screen = {
+            "screen_type": ScreenType.HOME_FEED,
+            "available_actions": [
+                "tap explore tab",
+                "tap home tab",
+                "tap messages tab",
+                "tap reels tab",
+                "press back",
+            ],
+            "context": {},
+            "selected_tab": "feed_tab",
+        }
+        action = planner.plan_next_step("open following list", screen)
+        assert action == "tap profile tab", (
+            f"Planner returned '{action}' instead of 'tap profile tab'. "
+            "It should use the HD Map to route HOME_FEED → OWN_PROFILE → FOLLOW_LIST."
+        )
+
+    def test_planner_returns_final_action_on_intermediate_screen(self, planner):
+        """
+        From OWN_PROFILE, goal 'open following list' should return
+        'tap following list' directly (we're already on the right screen).
+        """
+        screen = {
+            "screen_type": ScreenType.OWN_PROFILE,
+            "available_actions": [
+                "tap explore tab",
+                "tap home tab",
+                "tap reels tab",
+                "tap following list",
+                "press back",
+            ],
+            "context": {},
+            "selected_tab": "profile_tab",
+        }
+        action = planner.plan_next_step("open following list", screen)
+        assert action == "tap following list", (
+            f"Planner returned '{action}' instead of 'tap following list'. "
+            "On OWN_PROFILE, it should directly execute the final action."
+        )
+
+    def test_planner_detects_goal_already_achieved(self, planner):
+        """On FOLLOW_LIST, goal 'open following list' should return None (achieved)."""
+        screen = {
+            "screen_type": ScreenType.FOLLOW_LIST,
+            "available_actions": ["press back"],
+            "context": {},
+        }
+        action = planner.plan_next_step("open following list", screen)
+        assert action is None, "Goal is already achieved — planner should return None."
+
+    def test_planner_routes_explore_to_following_list(self, planner):
+        """From EXPLORE_GRID, route should be: Explore → Profile → FollowList."""
+        screen = {
+            "screen_type": ScreenType.EXPLORE_GRID,
+            "available_actions": [
+                "tap home tab",
+                "tap profile tab",
+                "tap reels tab",
+            ],
+            "context": {},
+            "selected_tab": "explore_tab",
+        }
+        action = planner.plan_next_step("open following list", screen)
+        assert action == "tap profile tab", (
+            f"From EXPLORE_GRID, planner should route via OWN_PROFILE, got '{action}'"
+        )
diff --git a/tests/unit/test_screen_topology.py b/tests/unit/test_screen_topology.py
new file mode 100644
index 0000000..0e401cb
--- /dev/null
+++ b/tests/unit/test_screen_topology.py
@@ -0,0 +1,98 @@
+"""
+🔴 RED TDD: ScreenTopology — The Instagram HD Map
+
+Tests for BFS pathfinding between Instagram screens.
+The killer test: HOME_FEED → OWN_PROFILE → FOLLOW_LIST must be a 2-step route.
+"""
+import pytest
+import sys
+import os
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../")))
+
+from GramAddict.core.goap import ScreenType
+from GramAddict.core.screen_topology import ScreenTopology
+
+
+class TestScreenTopologyRouting:
+    """BFS pathfinding must compute correct multi-step routes."""
+
+    def test_route_home_to_following_list(self):
+        """THE killer test: HomeFeed → OwnProfile → FollowList (2 hops)."""
+        route = ScreenTopology.find_route(ScreenType.HOME_FEED, ScreenType.FOLLOW_LIST)
+        assert route is not None, "Route from HOME_FEED to FOLLOW_LIST must exist"
+        assert len(route) == 2, f"Expected 2 hops, got {len(route)}: {route}"
+        assert route[0] == ("tap profile tab", ScreenType.OWN_PROFILE)
+        assert route[1] == ("tap following list", ScreenType.FOLLOW_LIST)
+
+    def test_route_already_there(self):
+        """Same screen = empty route (no steps needed)."""
+        route = ScreenTopology.find_route(ScreenType.HOME_FEED, ScreenType.HOME_FEED)
+        assert route == []
+
+    def test_route_single_hop(self):
+        """Direct neighbor = 1 step."""
+        route = ScreenTopology.find_route(ScreenType.HOME_FEED, ScreenType.EXPLORE_GRID)
+        assert route is not None
+        assert len(route) == 1
+        assert route[0] == ("tap explore tab", ScreenType.EXPLORE_GRID)
+
+    def test_route_reverse_direction(self):
+        """FollowList back to HomeFeed: FollowList → OwnProfile → HomeFeed (2 hops)."""
+        route = ScreenTopology.find_route(ScreenType.FOLLOW_LIST, ScreenType.HOME_FEED)
+        assert route is not None
+        assert len(route) == 2
+        assert route[0][1] == ScreenType.OWN_PROFILE
+        assert route[1][1] == ScreenType.HOME_FEED
+
+    def test_no_route_from_unreachable(self):
+        """FOREIGN_APP has no outbound transitions — route should be None."""
+        route = ScreenTopology.find_route(ScreenType.FOREIGN_APP, ScreenType.FOLLOW_LIST)
+        assert route is None
+
+
+class TestGoalToTargetScreen:
+    """Goal string → target ScreenType mapping."""
+
+    def test_following_list_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open following list") == ScreenType.FOLLOW_LIST
+
+    def test_followers_list_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open followers list") == ScreenType.FOLLOW_LIST
+
+    def test_profile_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open profile") == ScreenType.OWN_PROFILE
+
+    def test_home_feed_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open home feed") == ScreenType.HOME_FEED
+
+    def test_explore_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open explore feed") == ScreenType.EXPLORE_GRID
+
+    def test_messages_goal(self):
+        assert ScreenTopology.goal_to_target_screen("open messages") == ScreenType.DM_INBOX
+
+    def test_interaction_goal_returns_none(self):
+        """Non-navigation goals should return None."""
+        assert ScreenTopology.goal_to_target_screen("like this post") is None
+
+    def test_unknown_goal_returns_none(self):
+        assert ScreenTopology.goal_to_target_screen("do something random") is None
+
+
+class TestGetTransitions:
+    """Get available transitions from a screen."""
+
+    def test_home_feed_has_profile_tab(self):
+        transitions = ScreenTopology.get_transitions(ScreenType.HOME_FEED)
+        assert "tap profile tab" in transitions
+        assert transitions["tap profile tab"] == ScreenType.OWN_PROFILE
+
+    def test_own_profile_has_following_list(self):
+        transitions = ScreenTopology.get_transitions(ScreenType.OWN_PROFILE)
+        assert "tap following list" in transitions
+        assert transitions["tap following list"] == ScreenType.FOLLOW_LIST
+
+    def test_unknown_screen_returns_empty(self):
+        transitions = ScreenTopology.get_transitions(ScreenType.FOREIGN_APP)
+        assert transitions == {}