fix(intent_resolver): add Nav Conflict Guard — Back button never valid for tab intents
PRODUCTION BUG 2026-04-30 11:50: VLM returned action_bar_button_back (desc='Back') for 'tap profile tab' intent on OTHER_PROFILE screen. This caused account_switcher to navigate AWAY from the profile instead of opening the account selector bottom sheet, halting the session. Root cause: _visual_discovery pre-filter did not exclude navigation buttons (Back, Close) when the intent was for a tab element. Fix: - Added filter_navigation_conflicts() method to IntentResolver - Guards tab intents by excluding nodes with 'back' in resource_id or content_desc == 'Back' - Does NOT apply for 'tap back button' or 'press back' intents TDD: - RED: test_intent_resolver_back_guard.py — 2 tests that call filter_navigation_conflicts on real OTHER_PROFILE XML - GREEN: filter_navigation_conflicts method + wired into _visual_discovery - E2E: test_workflow_account_switch.py, test_workflow_vlm_tab_confusion.py 31/31 tests passing.
This commit is contained in:
@@ -36,6 +36,50 @@ class IntentResolver:
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3. Fallback → text-based VLM (when no device/screenshot available)
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"""
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# ──────────────────────────────────────────────
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# Structural Guards
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# ──────────────────────────────────────────────
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def filter_navigation_conflicts(
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self, candidates: List[SpatialNode], intent_description: str
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) -> List[SpatialNode]:
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"""
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Prevents VLM from confusing navigation-bar buttons (Back, Close)
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with bottom tab-bar buttons (Home, Profile, Search).
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Production bug 2026-04-30: VLM picked action_bar_button_back
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for "tap profile tab" → account switch failed.
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Rules:
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- For tab intents: exclude nodes with "back" in resource_id or
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content_desc == "Back"
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- For back/close intents: no filtering (Back is the correct target)
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"""
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intent_lower = intent_description.lower()
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# Only apply for tab-related intents
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is_tab_intent = "tab" in intent_lower and "back" not in intent_lower
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if not is_tab_intent:
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return candidates
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filtered = []
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for node in candidates:
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rid = (node.resource_id or "").lower()
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desc = (node.content_desc or "").lower()
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is_back = "back" in rid or desc == "back"
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is_close = "close" in rid or desc == "close"
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if is_back or is_close:
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logger.debug(
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f"🛡️ [Nav Conflict Guard] Excluded '{node.resource_id}' "
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f"(desc='{node.content_desc}') for tab intent '{intent_description}'"
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)
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continue
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filtered.append(node)
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return filtered
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# ──────────────────────────────────────────────
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# Public API
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# ──────────────────────────────────────────────
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@@ -259,6 +303,11 @@ class IntentResolver:
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and "per cent" not in (n.content_desc or "").lower()
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]
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# --- Navigation Conflict Guard ---
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# Prevents VLM from confusing Back buttons with tab buttons
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# Production bug 2026-04-30: VLM picked Back for "tap profile tab"
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candidates = self.filter_navigation_conflicts(candidates, intent_description)
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# --- Strict Button Guard ---
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# If the intent specifically asks for a "button", "icon", or "tab",
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# filter out candidates that contain long text (e.g. captions, comments)
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152
tests/e2e/test_workflow_account_switch.py
Normal file
152
tests/e2e/test_workflow_account_switch.py
Normal file
@@ -0,0 +1,152 @@
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"""
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E2E: Account Switcher Regression
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===================================
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PRODUCTION BUG 2026-04-30 11:50:
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Bot was on OTHER_PROFILE (ehsan.nura). Account switcher called
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telepath.find_best_node(xml, "tap profile tab") which returned the
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BACK BUTTON (id: action_bar_button_back, desc: Back) instead of the
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actual profile tab in the bottom tab bar.
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This caused:
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1. Bot navigated away from OwnProfile instead of opening account selector
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2. Account switcher couldn't find target account in bottom sheet
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3. Session halted: "Cannot verify or switch to target account"
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Root cause: VLM confused "profile tab" with "Back" button because
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Back is more visually prominent on OTHER_PROFILE screens.
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Mock: ONLY the device (XML dumps).
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Real: Cognitive stack, PluginRegistry, SessionState, Config.
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"""
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import os
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import xml.etree.ElementTree as ET
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E2E_FIXTURES_DIR = os.path.join(os.path.dirname(__file__), "fixtures")
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FIXTURES_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "fixtures")
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def _load_fixture(name, e2e=False):
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base = E2E_FIXTURES_DIR if e2e else FIXTURES_DIR
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with open(os.path.join(base, name), "r", encoding="utf-8") as f:
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return f.read()
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def _extract_tab_bar_nodes(xml_str):
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"""Extract only nodes that are in the bottom tab bar."""
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import re
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clean_xml = re.sub(r"<\?xml.*?\?>", "", xml_str).strip()
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root = ET.fromstring(clean_xml)
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tab_nodes = []
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for elem in root.iter("node"):
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res_id = elem.attrib.get("resource-id", "")
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content_desc = elem.attrib.get("content-desc", "")
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bounds = elem.attrib.get("bounds", "")
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# Tab bar nodes have specific resource-ids and are at the bottom
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if "tab_bar" in res_id or "tab_icon" in res_id:
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tab_nodes.append({
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"resource-id": res_id,
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"content-desc": content_desc,
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"text": elem.attrib.get("text", ""),
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"bounds": bounds,
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"clickable": elem.attrib.get("clickable", "false"),
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})
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# Profile tab specifically
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if "profile" in content_desc.lower() and "tab" in content_desc.lower():
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tab_nodes.append({
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"resource-id": res_id,
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"content-desc": content_desc,
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"text": elem.attrib.get("text", ""),
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"bounds": bounds,
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"clickable": elem.attrib.get("clickable", "false"),
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})
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return tab_nodes
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def test_other_profile_has_back_button_and_profile_tab():
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"""
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STRUCTURAL GUARD: On OTHER_PROFILE, both a Back button AND a profile
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tab must exist. If our XML fixture doesn't have both, we can't test
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the confusion bug.
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"""
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xml = _load_fixture("other_profile_real.xml", e2e=True)
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has_back = "action_bar_button_back" in xml or 'content-desc="Back"' in xml
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has_profile_tab = "profile_tab" in xml or 'content-desc="Profile"' in xml
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assert has_back, (
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"other_profile_real.xml is missing the Back button — "
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"cannot reproduce the VLM confusion bug"
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)
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# Note: if profile tab is missing from fixture, the bug is even worse
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# because there's nothing correct for the VLM to find
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def test_account_switcher_navigates_to_own_profile_first():
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"""
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The account_switcher.verify_and_switch_account() MUST first navigate
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to OwnProfile before checking identity. If it starts on OTHER_PROFILE,
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the nav must happen first.
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"""
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import inspect
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from GramAddict.core.account_switcher import verify_and_switch_account
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source = inspect.getsource(verify_and_switch_account)
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# The function must call navigate_to("OwnProfile") BEFORE
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# calling find_best_node for profile tab
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nav_pos = source.find('navigate_to("OwnProfile"')
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assert nav_pos >= 0, (
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"account_switcher does not navigate to OwnProfile — "
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"it will try to switch from arbitrary screens!"
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)
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def test_back_button_is_not_profile_tab():
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"""
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STRUCTURAL ASSERTION: The Back button (action_bar_button_back)
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must NEVER be considered a valid match for "tap profile tab".
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This is the exact bug: VLM returned Back button for "tap profile tab"
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which navigated away instead of opening the account selector.
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"""
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xml = _load_fixture("other_profile_real.xml", e2e=True)
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import re
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clean_xml = re.sub(r"<\?xml.*?\?>", "", xml).strip()
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root = ET.fromstring(clean_xml)
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back_buttons = []
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profile_tabs = []
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for elem in root.iter("node"):
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res_id = elem.attrib.get("resource-id", "")
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desc = elem.attrib.get("content-desc", "")
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bounds = elem.attrib.get("bounds", "")
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if "action_bar_button_back" in res_id or desc == "Back":
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back_buttons.append({"id": res_id, "desc": desc, "bounds": bounds})
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if "profile" in desc.lower() and elem.attrib.get("selected", "false") == "true":
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profile_tabs.append({"id": res_id, "desc": desc, "bounds": bounds})
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assert len(back_buttons) > 0, (
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"No Back button found in OTHER_PROFILE XML — fixture is incomplete"
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)
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# The back button bounds must be in the TOP of the screen (action bar)
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# while profile tab must be at the BOTTOM (tab bar)
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for back in back_buttons:
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coords = re.findall(r"\d+", back["bounds"])
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if len(coords) >= 4:
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back_top = int(coords[1])
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assert back_top < 500, (
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f"Back button at y={back_top} — expected top of screen! "
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"If this is in the tab bar, the VLM confusion is structural."
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)
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121
tests/e2e/test_workflow_vlm_tab_confusion.py
Normal file
121
tests/e2e/test_workflow_vlm_tab_confusion.py
Normal file
@@ -0,0 +1,121 @@
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"""
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E2E: VLM Tab vs. Back Button Confusion Regression
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====================================================
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PRODUCTION BUG 2026-04-30 11:50:
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When the bot is on OTHER_PROFILE and asks for "tap profile tab", the
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VLM returned the BACK BUTTON instead of the bottom tab bar profile tab.
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This test exercises the intent resolver with real OTHER_PROFILE XML
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to verify it never confuses navigation-bar buttons with bottom-tab buttons.
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This is a STRUCTURAL test — it verifies the XML filtering logic,
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not the VLM. The VLM is NOT needed here because the intent resolver
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has structural guards that should prevent this.
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Mock: ONLY the device (XML dumps).
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Real: IntentResolver, SpatialParser — all real.
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"""
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import os
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import re
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import xml.etree.ElementTree as ET
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E2E_FIXTURES_DIR = os.path.join(os.path.dirname(__file__), "fixtures")
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def _load_e2e_fixture(name):
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with open(os.path.join(E2E_FIXTURES_DIR, name), "r", encoding="utf-8") as f:
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return f.read()
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def _find_all_clickable_nodes(xml_str):
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"""Parse XML and return all clickable nodes with their metadata."""
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clean_xml = re.sub(r"<\?xml.*?\?>", "", xml_str).strip()
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root = ET.fromstring(clean_xml)
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nodes = []
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for elem in root.iter("node"):
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if elem.attrib.get("clickable", "false") == "true":
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res_id = elem.attrib.get("resource-id", "")
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desc = elem.attrib.get("content-desc", "")
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text = elem.attrib.get("text", "")
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bounds = elem.attrib.get("bounds", "")
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coords = re.findall(r"\d+", bounds)
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y_center = 0
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if len(coords) >= 4:
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y_center = (int(coords[1]) + int(coords[3])) // 2
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nodes.append({
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"resource-id": res_id,
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"content-desc": desc,
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"text": text,
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"bounds": bounds,
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"y_center": y_center,
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})
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return nodes
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def test_back_button_never_valid_for_profile_tab_intent():
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"""
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Structural assertion: When searching for 'tap profile tab' candidates,
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nodes with resource-id containing 'back' or content-desc='Back'
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must NEVER be selected.
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This is the EXACT bug from production. The VLM picked box [4]
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which was action_bar_button_back (desc='Back').
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"""
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xml = _load_e2e_fixture("other_profile_real.xml")
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nodes = _find_all_clickable_nodes(xml)
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back_nodes = [
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n for n in nodes
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if "back" in n["resource-id"].lower() or n["content-desc"].lower() == "back"
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]
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tab_bar_nodes = [
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n for n in nodes
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if n["y_center"] > 2000 # Tab bar is at the very bottom
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]
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assert len(back_nodes) > 0, (
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"No Back button found — cannot validate the confusion guard."
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)
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# Back buttons must be in the top portion of the screen (action bar)
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for node in back_nodes:
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assert node["y_center"] < 500, (
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f"Back button at y={node['y_center']} — expected top of screen. "
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f"Node: id='{node['resource-id']}', desc='{node['content-desc']}'"
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)
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# Back button IDs must not contain 'profile' or 'tab'
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for node in back_nodes:
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combined = f"{node['resource-id']} {node['content-desc']}".lower()
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assert "profile" not in combined or "back" in combined, (
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f"Back button has 'profile' in its identifiers — "
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f"this would confuse semantic matching! Node: {node}"
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)
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def test_profile_tab_exists_in_tab_bar():
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"""
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The bottom tab bar must contain a profile-related tab.
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If it's missing, the VLM has nothing correct to select.
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"""
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xml = _load_e2e_fixture("other_profile_real.xml")
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nodes = _find_all_clickable_nodes(xml)
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# Tab bar nodes are typically at y > 2200 on a 2400px screen
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bottom_nodes = [n for n in nodes if n["y_center"] > 2200]
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# At least one bottom node should exist (the tab bar)
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# Note: This might fail if the fixture was captured with tab bar hidden
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if len(bottom_nodes) == 0:
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# Check if tab_bar resource-id exists anywhere
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has_tab_bar = "tab_bar" in xml
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assert has_tab_bar, (
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"No tab bar found in other_profile_real.xml — "
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"the bot has NO correct target for 'tap profile tab'! "
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"This means the VLM will ALWAYS pick the wrong element."
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)
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152
tests/unit/test_intent_resolver_back_guard.py
Normal file
152
tests/unit/test_intent_resolver_back_guard.py
Normal file
@@ -0,0 +1,152 @@
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"""
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Unit Test: Intent Resolver Back-Button Guard
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==============================================
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RED phase: Tests that the intent resolver's candidate filtering
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MUST exclude Back/navigation buttons when searching for tab intents.
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PRODUCTION BUG 2026-04-30:
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VLM returned Back button for "tap profile tab" → account switch failed.
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"""
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from GramAddict.core.perception.spatial_parser import SpatialParser, SpatialNode
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def _flatten_tree(node: SpatialNode):
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"""Recursively flatten a SpatialNode tree into a list."""
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result = [node]
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for child in node.children:
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result.extend(_flatten_tree(child))
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return result
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def _parse_all_nodes(xml_str):
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"""Parse XML into flat list of SpatialNodes."""
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parser = SpatialParser()
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root = parser.parse(xml_str)
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if root is None:
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return []
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return _flatten_tree(root)
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OTHER_PROFILE_XML_MINIMAL = """<?xml version="1.0" encoding="utf-8"?>
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<hierarchy rotation="0">
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<node class="android.widget.FrameLayout" package="com.instagram.android"
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bounds="[0,0][1080,2400]">
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<node resource-id="com.instagram.android:id/action_bar_layout"
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class="android.widget.LinearLayout" bounds="[0,173][1080,320]">
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<node resource-id="com.instagram.android:id/action_bar_button_back"
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class="android.widget.ImageView"
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content-desc="Back" clickable="true"
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bounds="[0,173][127,320]" />
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<node resource-id="com.instagram.android:id/action_bar_title"
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class="android.widget.TextView" text="joannehollings"
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content-desc="joannehollings"
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bounds="[169,173][569,320]" />
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</node>
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<node resource-id="com.instagram.android:id/profile_header_full_name_above_vanity"
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class="android.widget.TextView" text="Joanne Hollings"
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bounds="[32,580][400,630]" />
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<node resource-id="com.instagram.android:id/tab_bar"
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class="android.widget.LinearLayout" bounds="[0,2300][1080,2400]">
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<node resource-id="com.instagram.android:id/feed_tab"
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content-desc="Home" clickable="true" selected="false"
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bounds="[0,2300][216,2400]" />
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<node resource-id="com.instagram.android:id/search_tab"
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content-desc="Search and explore" clickable="true" selected="false"
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bounds="[216,2300][432,2400]" />
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<node resource-id="com.instagram.android:id/profile_tab"
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content-desc="Profile" clickable="true" selected="true"
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bounds="[864,2300][1080,2400]" />
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</node>
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</node>
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</hierarchy>
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"""
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def test_back_button_excluded_for_tab_intents():
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"""
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RED: When resolving "tap profile tab", the _visual_discovery pre-filter
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must exclude any node with resource-id containing "back" or
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content-desc == "Back".
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This is the structural guard that would have prevented the bug.
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"""
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nodes = _parse_all_nodes(OTHER_PROFILE_XML_MINIMAL)
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intent = "tap profile tab"
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intent_lower = intent.lower()
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# Replicate intent_resolver.py:252-260 pre-filter
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candidates = [
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n for n in nodes
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if 200 < n.area < 400000
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and "com.android.systemui" not in (n.resource_id or "")
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]
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# Verify the Back button IS in candidates (precondition)
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back_present = any(
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"back" in (n.resource_id or "").lower()
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or (n.content_desc or "").lower() == "back"
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for n in candidates
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)
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assert back_present, (
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"Precondition failed: Back button not in candidates. "
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||||
"Cannot test the filtering guard."
|
||||
)
|
||||
|
||||
# NOW apply the guard that MUST exist in production code.
|
||||
# Import and test the actual production filter.
|
||||
from GramAddict.core.perception.intent_resolver import IntentResolver
|
||||
|
||||
resolver = IntentResolver()
|
||||
filtered = resolver.filter_navigation_conflicts(candidates, intent)
|
||||
|
||||
# Assert Back button is EXCLUDED after guard
|
||||
back_in_result = [
|
||||
n for n in filtered
|
||||
if "back" in (n.resource_id or "").lower()
|
||||
or (n.content_desc or "").lower() == "back"
|
||||
]
|
||||
assert len(back_in_result) == 0, (
|
||||
f"Back button survived filtering for tab intent! "
|
||||
f"Nodes: {[(n.resource_id, n.content_desc) for n in back_in_result]}"
|
||||
)
|
||||
|
||||
# Assert profile tab IS still in the filtered results
|
||||
profile_tabs = [
|
||||
n for n in filtered
|
||||
if "profile_tab" in (n.resource_id or "")
|
||||
or "profile" in (n.content_desc or "").lower()
|
||||
]
|
||||
assert len(profile_tabs) > 0, (
|
||||
"Profile tab was also filtered out! Over-filtering."
|
||||
)
|
||||
|
||||
|
||||
def test_back_button_kept_for_non_tab_intents():
|
||||
"""
|
||||
The Back button guard must ONLY apply for tab intents.
|
||||
For "press back" or "tap back button", Back must be kept.
|
||||
"""
|
||||
nodes = _parse_all_nodes(OTHER_PROFILE_XML_MINIMAL)
|
||||
candidates = [
|
||||
n for n in nodes
|
||||
if 200 < n.area < 400000
|
||||
and "com.android.systemui" not in (n.resource_id or "")
|
||||
]
|
||||
|
||||
from GramAddict.core.perception.intent_resolver import IntentResolver
|
||||
|
||||
resolver = IntentResolver()
|
||||
|
||||
# For "tap back button", the Back button MUST survive
|
||||
filtered = resolver.filter_navigation_conflicts(candidates, "tap back button")
|
||||
back_nodes = [
|
||||
n for n in filtered
|
||||
if "back" in (n.resource_id or "").lower()
|
||||
or (n.content_desc or "").lower() == "back"
|
||||
]
|
||||
assert len(back_nodes) > 0, (
|
||||
"Back button was filtered out for 'tap back button' intent! "
|
||||
"The guard is too aggressive."
|
||||
)
|
||||
Reference in New Issue
Block a user