diff --git a/examples/deps/demo.py b/examples/deps/demo.py
index 6a6fd6c..1e3851f 100644
--- a/examples/deps/demo.py
+++ b/examples/deps/demo.py
@@ -46,10 +46,10 @@ async def main() -> None:
 
         # Use the package immediately
         print("\n3. Using the installed package:")
-        result = await session.run('''
+        result = await session.run("""
 import art
 print(art.text2art("Hello!"))
-''')
+""")
         print(result.stdout)
 
         # Add another package with version specifier
diff --git a/src/py_code_mode/execution/container/config.py b/src/py_code_mode/execution/container/config.py
index f7df3c6..2e73fbf 100644
--- a/src/py_code_mode/execution/container/config.py
+++ b/src/py_code_mode/execution/container/config.py
@@ -255,10 +255,15 @@ def to_docker_config(
         }
 
         # Add port binding
+        bind_ip: str | None = None
+        if self.auth_disabled and not self.auth_token:
+            # Safer default: when auth is disabled, don't publish on all interfaces.
+            bind_ip = "127.0.0.1"
+
         if self.port > 0:
-            config["ports"] = {"8080/tcp": self.port}
+            config["ports"] = {"8080/tcp": (bind_ip, self.port) if bind_ip else self.port}
         else:
-            config["ports"] = {"8080/tcp": None}  # Auto-assign
+            config["ports"] = {"8080/tcp": (bind_ip, None) if bind_ip else None}  # Auto-assign
 
         # Add volumes from storage access
         volumes = {}
diff --git a/src/py_code_mode/execution/container/server.py b/src/py_code_mode/execution/container/server.py
index 753ffb5..0803fea 100644
--- a/src/py_code_mode/execution/container/server.py
+++ b/src/py_code_mode/execution/container/server.py
@@ -793,7 +793,7 @@ async def api_search_tools(query: str, limit: int = 10) -> list[dict[str, Any]]:
     async def api_list_workflows() -> list[dict[str, Any]]:
         """Return all workflows."""
         if _state.workflow_library is None:
-            return []
+            raise HTTPException(status_code=503, detail="Workflow library not initialized")
 
         workflows = _state.workflow_library.list()
         return [
@@ -809,7 +809,7 @@ async def api_list_workflows() -> list[dict[str, Any]]:
     async def api_search_workflows(query: str, limit: int = 5) -> list[dict[str, Any]]:
         """Search workflows."""
         if _state.workflow_library is None:
-            return []
+            raise HTTPException(status_code=503, detail="Workflow library not initialized")
 
         workflows = _state.workflow_library.search(query, limit=limit)
         return [
@@ -825,7 +825,7 @@ async def api_search_workflows(query: str, limit: int = 5) -> list[dict[str, Any
     async def api_get_workflow(name: str) -> dict[str, Any] | None:
         """Get workflow by name with full source."""
         if _state.workflow_library is None:
-            return None
+            raise HTTPException(status_code=503, detail="Workflow library not initialized")
 
         workflow = _state.workflow_library.get(name)
         if workflow is None:
diff --git a/src/py_code_mode/tools/adapters/http.py b/src/py_code_mode/tools/adapters/http.py
index 26eb322..35c7968 100644
--- a/src/py_code_mode/tools/adapters/http.py
+++ b/src/py_code_mode/tools/adapters/http.py
@@ -5,6 +5,7 @@
 import re
 from dataclasses import dataclass, field
 from typing import Any
+from urllib.parse import quote
 
 from py_code_mode.errors import ToolCallError, ToolNotFoundError
 from py_code_mode.tools.types import Tool, ToolCallable, ToolParameter
@@ -54,6 +55,7 @@ def __init__(
         self,
         base_url: str,
         headers: dict[str, str] | None = None,
+        timeout: float | None = 30.0,
     ) -> None:
         """Initialize adapter with base URL.
 
@@ -63,6 +65,7 @@ def __init__(
         """
         self.base_url = base_url.rstrip("/")
         self.headers = headers or {}
+        self.timeout = timeout
         self._endpoints: dict[str, Endpoint] = {}
 
     @property
@@ -148,13 +151,21 @@ async def call_tool(
             ) from e
 
         # Build URL with path parameters
-        url = self._build_url(endpoint.path, args)
+        try:
+            url = self._build_url(endpoint.path, args)
+        except Exception as e:
+            raise ToolCallError(name, tool_args=args, cause=e) from e
 
         # Separate path params from body params
         path_params = self._extract_path_params(endpoint.path)
         body_params = {k: v for k, v in args.items() if k not in path_params}
 
-        async with aiohttp.ClientSession(headers=self.headers) as session:
+        session_timeout = (
+            aiohttp.ClientTimeout(total=self.timeout)
+            if self.timeout is not None
+            else aiohttp.ClientTimeout(total=None)
+        )
+        async with aiohttp.ClientSession(headers=self.headers, timeout=session_timeout) as session:
             try:
                 if endpoint.method.upper() in ("POST", "PUT", "PATCH"):
                     response = await session.request(
@@ -179,7 +190,7 @@ async def call_tool(
 
                 return await response.json()
 
-            except aiohttp.ClientError as e:
+            except (aiohttp.ClientError, TimeoutError) as e:
                 raise ToolCallError(name, tool_args=args, cause=e) from e
 
     def _build_url(self, path: str, args: dict[str, Any]) -> str:
@@ -192,12 +203,12 @@ def _build_url(self, path: str, args: dict[str, Any]) -> str:
         Returns:
             Full URL with parameters substituted.
         """
-        # Substitute path parameters
         url = self.base_url + path
-        for param_name, param_value in args.items():
+        for param_name in self._extract_path_params(path):
+            if param_name not in args:
+                raise ValueError(f"Missing required path parameter: {param_name}")
             placeholder = "{" + param_name + "}"
-            if placeholder in url:
-                url = url.replace(placeholder, str(param_value))
+            url = url.replace(placeholder, quote(str(args[param_name]), safe=""))
         return url
 
     def _extract_path_params(self, path: str) -> set[str]:
diff --git a/src/py_code_mode/workflows/vector_stores/redis_store.py b/src/py_code_mode/workflows/vector_stores/redis_store.py
index 970ba45..701a90b 100644
--- a/src/py_code_mode/workflows/vector_stores/redis_store.py
+++ b/src/py_code_mode/workflows/vector_stores/redis_store.py
@@ -400,11 +400,9 @@ def _knn_search(
         try:
             results = self._redis.ft(self._index_name).search(q, query_params={"vec": query_bytes})
         except redis.exceptions.ResponseError as e:
-            logger.error(f"RediSearch query failed: {e}")
-            return {}
+            raise RuntimeError(f"RediSearch query failed: {e}") from e
         except redis.exceptions.ConnectionError as e:
-            logger.error(f"Redis connection failed during search: {e}")
-            return {}
+            raise RuntimeError(f"Redis connection failed during search: {e}") from e
 
         scores: dict[str, float] = {}
         for doc in results.docs:
diff --git a/src/py_code_mode/workflows/workflow.py b/src/py_code_mode/workflows/workflow.py
index 52f04fa..7fb3779 100644
--- a/src/py_code_mode/workflows/workflow.py
+++ b/src/py_code_mode/workflows/workflow.py
@@ -52,8 +52,22 @@ class WorkflowParameter:
     default: Any = None
 
 
-# Special parameters that are injected, not user-provided
-_INJECTED_PARAMS = {"tools", "workflows", "artifacts", "deps"}
+_NAMESPACE_GLOBALS = frozenset({"tools", "workflows", "artifacts", "deps"})
+
+
+def _validate_run_does_not_take_namespace_params(run_func: ast.AsyncFunctionDef) -> None:
+    """Workflows access namespaces via globals, not run() parameters."""
+    args = [
+        *run_func.args.posonlyargs,
+        *run_func.args.args,
+        *run_func.args.kwonlyargs,
+    ]
+    for arg in args:
+        if arg.arg in _NAMESPACE_GLOBALS:
+            raise ValueError(
+                f"Workflow run() must not declare parameter {arg.arg!r}; "
+                f"use the global {arg.arg} namespace instead."
+            )
 
 
 def _annotation_to_type_str(annotation: ast.expr | None) -> str:
@@ -133,9 +147,6 @@ def _extract_parameters_from_ast(run_func: ast.AsyncFunctionDef) -> list[Workflo
     parameters: list[WorkflowParameter] = []
 
     def _add_param(arg_node: ast.arg, default_node: ast.expr | None) -> None:
-        if arg_node.arg in _INJECTED_PARAMS:
-            return
-
         if default_node is not None:
             default_val = _default_expr_to_value(default_node)
             has_default = True
@@ -228,6 +239,8 @@ def from_source(
         if has_sync_run:
             raise ValueError("Workflow must define 'async def run()', not 'def run()'")
 
+        _validate_run_does_not_take_namespace_params(run_node)
+
         # Extract description from source if not provided
         if not description:
             # Try module docstring first
@@ -275,6 +288,8 @@ def from_file(cls, path: Path) -> PythonWorkflow:
         if has_sync_run:
             raise ValueError(f"Workflow {path} must define 'async def run()', not 'def run()'")
 
+        _validate_run_does_not_take_namespace_params(run_node)
+
         # Extract description from module or function docstring
         description = ast.get_docstring(tree) or ast.get_docstring(run_node) or ""
         description = description.strip().split("\n")[0]
diff --git a/tests/container/test_container_api.py b/tests/container/test_container_api.py
index 87d5433..05700ba 100644
--- a/tests/container/test_container_api.py
+++ b/tests/container/test_container_api.py
@@ -140,6 +140,36 @@ def test_search_workflows_requires_auth(self, auth_client) -> None:
         response = client.get("/api/workflows/search", params={"query": "fetch"})
         assert response.status_code == 401
 
+    def test_workflows_endpoints_return_503_if_library_not_initialized(self, tmp_path) -> None:
+        """Workflows endpoints should not silently return empty results if init failed."""
+        try:
+            from fastapi.testclient import TestClient
+        except ImportError:
+            pytest.skip("FastAPI not installed")
+
+        from py_code_mode.execution.container.config import SessionConfig
+        from py_code_mode.execution.container.server import create_app
+
+        # Force workflow library init failure: workflows_path exists as a FILE.
+        workflows_path = tmp_path / "workflows"
+        workflows_path.write_text("not a directory")
+
+        config = SessionConfig(
+            artifacts_path=tmp_path / "artifacts",
+            workflows_path=workflows_path,
+        )
+        config.auth_token = "test-token"
+
+        app = create_app(config)
+        with TestClient(app) as client:
+            headers = {"Authorization": "Bearer test-token"}
+
+            resp = client.get("/api/workflows", headers=headers)
+            assert resp.status_code == 503
+
+            resp = client.get("/api/workflows/search", params={"query": "x"}, headers=headers)
+            assert resp.status_code == 503
+
     def test_get_workflow_returns_none_when_not_found(self, auth_client) -> None:
         """GET /api/workflows/{name} returns null when workflow not found."""
         client, token = auth_client
diff --git a/tests/container/test_executor.py b/tests/container/test_executor.py
index e24b748..9b0781d 100644
--- a/tests/container/test_executor.py
+++ b/tests/container/test_executor.py
@@ -226,6 +226,28 @@ async def test_to_docker_config_with_volumes(self, tmp_path) -> None:
         )
 
 
+class TestContainerExecutorNetworking:
+    """Tests for networking configuration."""
+
+    def test_auth_disabled_binds_published_port_to_localhost(self) -> None:
+        """When auth is disabled, published ports should not bind 0.0.0.0."""
+        config = ContainerConfig(port=9000, auth_disabled=True)
+        docker_config = config.to_docker_config()
+        assert docker_config["ports"]["8080/tcp"] == ("127.0.0.1", 9000)
+
+    def test_auth_disabled_binds_auto_port_to_localhost(self) -> None:
+        """When auth is disabled and port=0, auto-assigned ports should bind localhost."""
+        config = ContainerConfig(port=0, auth_disabled=True)
+        docker_config = config.to_docker_config()
+        assert docker_config["ports"]["8080/tcp"] == ("127.0.0.1", None)
+
+    def test_auth_enabled_keeps_default_port_binding(self) -> None:
+        """With auth enabled, preserve existing port binding behavior."""
+        config = ContainerConfig(port=9000, auth_token="secret")
+        docker_config = config.to_docker_config()
+        assert docker_config["ports"]["8080/tcp"] == 9000
+
+
 class TestContainerExecutorEnvironment:
     """Tests for environment configuration."""
 
diff --git a/tests/test_http_adapter.py b/tests/test_http_adapter.py
index 17a26fd..64ea740 100644
--- a/tests/test_http_adapter.py
+++ b/tests/test_http_adapter.py
@@ -284,6 +284,40 @@ async def test_call_tool_handles_http_error(self, adapter) -> None:
             with pytest.raises(ToolCallError):
                 await adapter.call_tool("get_user", None, {"user_id": 42})
 
+    @pytest.mark.asyncio
+    async def test_call_tool_urlencodes_path_parameters(self, adapter) -> None:
+        """Path parameters are URL-encoded to avoid accidental path traversal."""
+        with patch("aiohttp.ClientSession") as mock_client_session:
+            mock_response = AsyncMock()
+            mock_response.status = 200
+            mock_response.json = AsyncMock(return_value={"ok": True})
+
+            mock_session = AsyncMock()
+            mock_session.request = AsyncMock(return_value=mock_response)
+            mock_session.__aenter__ = AsyncMock(return_value=mock_session)
+            mock_session.__aexit__ = AsyncMock(return_value=None)
+            mock_client_session.return_value = mock_session
+
+            await adapter.call_tool("get_user", None, {"user_id": "a/b"})
+
+            call_args = mock_session.request.call_args
+            assert "/users/a%2Fb" in call_args[0][1]
+
+    @pytest.mark.asyncio
+    async def test_call_tool_timeout_is_wrapped(self, adapter) -> None:
+        """Timeout errors are raised as ToolCallError (not left as bare TimeoutError)."""
+        from py_code_mode.errors import ToolCallError
+
+        with patch("aiohttp.ClientSession") as mock_client_session:
+            mock_session = AsyncMock()
+            mock_session.request = AsyncMock(side_effect=TimeoutError())
+            mock_session.__aenter__ = AsyncMock(return_value=mock_session)
+            mock_session.__aexit__ = AsyncMock(return_value=None)
+            mock_client_session.return_value = mock_session
+
+            with pytest.raises(ToolCallError):
+                await adapter.call_tool("get_user", None, {"user_id": 42})
+
 
 class TestHTTPAdapterWithRegistry:
     """Tests for HTTPAdapter integration with ToolRegistry."""
diff --git a/tests/test_skills.py b/tests/test_skills.py
index b21525e..11e58a6 100644
--- a/tests/test_skills.py
+++ b/tests/test_skills.py
@@ -132,24 +132,29 @@ def test_workflow_with_tools_access(self, tmp_path: Path) -> None:
             dedent('''
             """Scan a network target."""
 
-            async def run(target: str, tools) -> str:
-                """Run a scan using tools.
-
-                Args:
-                    target: Target to scan
-                    tools: Tools namespace (injected)
-                """
+            async def run(target: str) -> str:
+                """Run a scan using tools."""
                 # In real use, would call tools.call(...)
+                _ = tools  # namespace is available as a global
                 return f"Scanning {target}"
         ''').strip()
         )
 
         workflow = PythonWorkflow.from_file(workflow_path)
 
-        # tools parameter should be recognized as special, not a user param
-        user_params = [p for p in workflow.parameters if p.name != "tools"]
-        assert len(user_params) == 1
-        assert user_params[0].name == "target"
+        assert [p.name for p in workflow.parameters] == ["target"]
+
+
+class TestPythonWorkflowNamespaceParamValidation:
+    def test_from_source_rejects_namespace_params(self) -> None:
+        """run() must not accept tools/workflows/artifacts/deps as parameters."""
+        source = dedent("""
+            async def run(x: int, tools) -> int:
+                return x
+        """).strip()
+
+        with pytest.raises(ValueError, match=r"must not declare parameter 'tools'"):
+            PythonWorkflow.from_source(name="bad", source=source)
 
 
 class TestPythonWorkflowFromSource: