feat(browser): prove pristine Agent Task profile admission

CHANGELOG.md

@@ -25,6 +25,7 @@ All notable changes to OriginWeave are documented in this file. The format follo
 - Rust 1.97.1 build contract, strict Clippy and rustdoc gates, and exact production function, line, region, and branch coverage enforcement.
 - Pinned Chrome-for-Testing Agent Task evidence now captures a bounded sampled Chromium root-plus-descendant process count and RSS total from one `/proc` status sweep, with bounded failure-type diagnostics while preserving the root-only metric and making no trusted per-task attribution claim.
 - Pinned Chrome-for-Testing Agent Task evidence now locates the controlled result by exact browser-computed `status`/`Task result` semantics and records only a bounded canonical SHA-256 digest plus stable field identity for the extracted synthetic value, without emitting the raw value.
+- Controlled pinned-Chromium Agent Task acceptance now fails closed unless the temporary profile is pristine before launch, browser-observed cookies and Web Storage are empty, saved-credential services are disabled, extensions are disabled by launch policy, and the profile is removed afterward; bounded per-trial evidence does not claim OS- or browser-attested absence of every credential mechanism.
 - Hourly bounded OpenCode product-development workflow using `NVIDIA_NIM_API_KEY`, an unprivileged disposable workspace, loopback-only model broker, independently verified patches, and publication through a dedicated `OPENCODE_PR_TOKEN` that cannot review or merge.
 - Architecture, agent, security, contribution, research, database naming, roadmap, quality-gate, and TLS service-identity ADR documentation.
 - Authoritative product documentation graph spanning PRD, TRD, ADR lifecycle/index, product-wide UML, conceptual ERD, requirement/decision traceability, threat modeling, product-wide test strategy, operability, API/protocol, release/rollback, and current primary-source standards doctoring, with machine-checkable repository contracts that keep conversation-derived future work distinct from protected-main implementation claims.

scripts/ci/run_mv3_compatibility.py

@@ -283,6 +283,52 @@ def _measure_agent_task_semantic_observation_bytes(observation: dict[str, Any])
     return len(encoded)
 
 
+def _require_pristine_agent_task_profile(profile_dir: str) -> None:
+    """Fail closed unless the controlled Agent Task profile directory is empty."""
+
+    profile_path = pathlib.Path(profile_dir)
+    if not profile_path.is_dir() or any(profile_path.iterdir()):
+        raise RuntimeError("Agent Task profile is not pristine before launch")
+
+
+def _probe_agent_task_ambient_state(driver_port: int, session_id: str) -> dict[str, bool]:
+    """Require no browser-visible cookies or Web Storage before the controlled action."""
+
+    cookies = _json_request(
+        driver_port,
+        "GET",
+        _webdriver_path(session_id, "/cookie"),
+    ).get("value")
+    if not isinstance(cookies, list):
+        raise RuntimeError("Agent Task cookie inspection returned malformed evidence")
+    if cookies:
+        raise RuntimeError("Agent Task profile exposed ambient cookies")
+
+    storage = _execute(
+        driver_port,
+        session_id,
+        """
+return {
+  localStorageLength: window.localStorage.length,
+  sessionStorageLength: window.sessionStorage.length
+};
+""",
+    )
+    if not isinstance(storage, dict):
+        raise RuntimeError("Agent Task Web Storage inspection returned malformed evidence")
+    local_storage_length = storage.get("localStorageLength")
+    session_storage_length = storage.get("sessionStorageLength")
+    for value in (local_storage_length, session_storage_length):
+        if isinstance(value, bool) or not isinstance(value, int) or value < 0:
+            raise RuntimeError("Agent Task Web Storage inspection returned malformed evidence")
+    if local_storage_length or session_storage_length:
+        raise RuntimeError("Agent Task profile exposed ambient Web Storage")
+    return {
+        "ambient_cookies_absent": True,
+        "ambient_web_storage_absent": True,
+    }
+
+
 def _parse_linux_proc_status_rss_bytes(status_text: str) -> int:
     """Parse exactly one positive Linux ``VmRSS`` kB field into bounded bytes."""
 
@@ -743,6 +789,8 @@ def _run_agent_task_browser_pass(
 ) -> dict[str, Any]:
     """Execute one synthetic Agent Task and measure bounded real-browser evidence."""
 
+    _require_pristine_agent_task_profile(profile_dir)
+    profile_pristine_before_launch = True
     started = time.monotonic()
     driver_port = _free_loopback_port()
     session_id: str | None = None
@@ -764,6 +812,10 @@ def _run_agent_task_browser_pass(
                         "browserName": "chrome",
                         "goog:chromeOptions": {
                             "binary": str(chrome_bin),
+                            "prefs": {
+                                "credentials_enable_service": False,
+                                "profile.password_manager_enabled": False,
+                            },
                             "args": [
                                 "--headless=new",
                                 "--no-first-run",
@@ -816,6 +868,7 @@ def _run_agent_task_browser_pass(
         ).get("value")
         if initial_url != fixture_url:
             raise RuntimeError("Agent Task did not load the requested fixture URL")
+        ambient_state = _probe_agent_task_ambient_state(driver_port, session_id)
 
         input_element = _find_element_by_accessible_role_name(
             driver_port,
@@ -937,6 +990,10 @@ def _run_agent_task_browser_pass(
             "structured_value_field": "task_result",
             "structured_value_sha256": structured_value_sha256,
             "extensions_disabled": True,
+            "profile_pristine_before_launch": profile_pristine_before_launch,
+            "ambient_cookies_absent": ambient_state["ambient_cookies_absent"],
+            "ambient_web_storage_absent": ambient_state["ambient_web_storage_absent"],
+            "saved_credential_services_disabled": True,
             "browser_process_rss_bytes": browser_process_rss_bytes,
             "chromium_process_count": chromium_process_count,
             "chromium_process_set_rss_bytes": chromium_process_set_rss_bytes,
@@ -999,6 +1056,12 @@ def _run_agent_task_trial(
         "structured_value_field": result["structured_value_field"],
         "structured_value_sha256": result["structured_value_sha256"],
         "extensions_disabled": result["extensions_disabled"],
+        "profile_pristine_before_launch": result["profile_pristine_before_launch"],
+        "ambient_cookies_absent": result["ambient_cookies_absent"],
+        "ambient_web_storage_absent": result["ambient_web_storage_absent"],
+        "saved_credential_services_disabled": result[
+            "saved_credential_services_disabled"
+        ],
         "browser_process_rss_bytes": result["browser_process_rss_bytes"],
         "chromium_process_count": result["chromium_process_count"],
         "chromium_process_set_rss_bytes": result["chromium_process_set_rss_bytes"],
@@ -1380,6 +1443,16 @@ def main() -> int:
         agent_task_trial_pass_rate = (
             agent_task_successful_trials / AGENT_TASK_REPEATABILITY_TRIALS
         )
+        agent_task_isolation_complete = all(
+            trial.get("profile_pristine_before_launch") is True
+            and trial.get("ambient_cookies_absent") is True
+            and trial.get("ambient_web_storage_absent") is True
+            and trial.get("saved_credential_services_disabled") is True
+            and trial.get("extensions_disabled") is True
+            and trial.get("profile_cleaned") is True
+            for trial in agent_task_trials
+            if trial.get("passed") is True
+        )
         agent_task_surfaces_complete = all(
             trial.get("post_condition") is True
             and trial.get("input_echo_verified") is True
@@ -1438,6 +1511,7 @@ def main() -> int:
                 "repeatability_trials": AGENT_TASK_REPEATABILITY_TRIALS,
                 "successful_trials": agent_task_successful_trials,
                 "trial_pass_rate": agent_task_trial_pass_rate,
+                "isolation_complete": agent_task_isolation_complete,
                 "trial_results": agent_task_trials,
                 "forced_close": {
                     "repeatability_trials": AGENT_TASK_REPEATABILITY_TRIALS,
@@ -1461,6 +1535,8 @@ def main() -> int:
                 f"{agent_task_successful_trials}/{AGENT_TASK_REPEATABILITY_TRIALS} "
                 "trials passed"
             )
+        if not agent_task_isolation_complete:
+            raise RuntimeError("Agent Task isolation gate failed")
         if not agent_task_surfaces_complete:
             raise RuntimeError("Agent Task repeatability surfaces were incomplete")
         if (

tests/test_agent_task_pristine_profile_contract.py

@@ -0,0 +1,110 @@
+"""Contract for pristine, credential-free Agent Task browser profile admission."""
+
+from __future__ import annotations
+
+import pathlib
+import runpy
+import tempfile
+import unittest
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+RUNNER = ROOT / "scripts" / "ci" / "run_mv3_compatibility.py"
+
+
+class AgentTaskPristineProfileContractTests(unittest.TestCase):
+    """Require explicit isolation proof before the pinned browser task can pass."""
+
+    def _namespace(self, name: str) -> dict[str, object]:
+        return runpy.run_path(str(RUNNER), run_name=name)
+
+    def test_runner_exposes_pristine_profile_and_ambient_state_boundaries(self) -> None:
+        """Profile admission and ambient-state inspection must be explicit boundaries."""
+
+        namespace = self._namespace("agent_task_pristine_profile_contract")
+        self.assertIn("_require_pristine_agent_task_profile", namespace)
+        self.assertIn("_probe_agent_task_ambient_state", namespace)
+
+    def test_profile_admission_rejects_preexisting_state(self) -> None:
+        """Any pre-existing profile entry must fail closed before Chromium starts."""
+
+        namespace = self._namespace("agent_task_pristine_profile_behavior")
+        require_pristine = namespace["_require_pristine_agent_task_profile"]
+        with tempfile.TemporaryDirectory(prefix="originweave-pristine-profile-") as profile_dir:
+            require_pristine(profile_dir)
+            pathlib.Path(profile_dir, "Cookies").write_text("preexisting", encoding="utf-8")
+            with self.assertRaisesRegex(RuntimeError, "not pristine"):
+                require_pristine(profile_dir)
+
+    def test_ambient_state_probe_rejects_cookies_or_web_storage(self) -> None:
+        """Browser-visible cookie or Web Storage state must not be normalized as isolated."""
+
+        namespace = self._namespace("agent_task_ambient_state_behavior")
+        probe = namespace["_probe_agent_task_ambient_state"]
+
+        def no_cookies_request(
+            _driver_port: int,
+            method: str,
+            path: str,
+            _payload: object | None = None,
+            **_kwargs: object,
+        ) -> dict[str, object]:
+            self.assertEqual(method, "GET")
+            self.assertTrue(path.endswith("/cookie"))
+            return {"value": []}
+
+        probe.__globals__["_json_request"] = no_cookies_request
+        probe.__globals__["_execute"] = lambda *_args, **_kwargs: {
+            "localStorageLength": 0,
+            "sessionStorageLength": 0,
+        }
+        self.assertEqual(
+            probe(4444, "session-a"),
+            {
+                "ambient_cookies_absent": True,
+                "ambient_web_storage_absent": True,
+            },
+        )
+
+        def ambient_cookie_request(
+            _driver_port: int,
+            _method: str,
+            _path: str,
+            _payload: object | None = None,
+            **_kwargs: object,
+        ) -> dict[str, object]:
+            return {"value": [{"name": "ambient", "value": "redacted-test"}]}
+
+        probe.__globals__["_json_request"] = ambient_cookie_request
+        with self.assertRaisesRegex(RuntimeError, "ambient cookies"):
+            probe(4444, "session-a")
+
+        probe = self._namespace("agent_task_ambient_storage_behavior")[
+            "_probe_agent_task_ambient_state"
+        ]
+        probe.__globals__["_json_request"] = no_cookies_request
+        probe.__globals__["_execute"] = lambda *_args, **_kwargs: {
+            "localStorageLength": 1,
+            "sessionStorageLength": 0,
+        }
+        with self.assertRaisesRegex(RuntimeError, "ambient Web Storage"):
+            probe(4444, "session-a")
+
+    def test_agent_task_disables_saved_credential_services_and_gates_evidence(self) -> None:
+        """The acceptance runner must configure and require credential-free isolation evidence."""
+
+        runner = RUNNER.read_text(encoding="utf-8")
+        for expected in (
+            '"credentials_enable_service": False',
+            '"profile.password_manager_enabled": False',
+            '"profile_pristine_before_launch"',
+            '"ambient_cookies_absent"',
+            '"ambient_web_storage_absent"',
+            '"saved_credential_services_disabled"',
+            "Agent Task isolation gate failed",
+        ):
+            with self.subTest(expected=expected):
+                self.assertIn(expected, runner)
+
+
+if __name__ == "__main__":
+    unittest.main()