Move workspace roots onto thread/session state and stop using active permission profile modifications as an overlay for writable roots. Existing app-server threads now preserve their persisted PermissionProfile value across resume, fork, and turn updates; permissions requests on existing threads only update the active named profile after validating it exists. Workspace roots can be updated independently, and SandboxPolicy::WorkspaceWrite no longer stores its own writable_roots.

codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json

@@ -18,14 +18,6 @@
         "id": {
           "description": "Identifier from `default_permissions` or the implicit built-in default, such as `:workspace` or a user-defined `[permissions.<id>]` profile.",
           "type": "string"
-        },
-        "modifications": {
-          "default": [],
-          "description": "Bounded user-requested modifications applied on top of the named profile, if any.",
-          "items": {
-            "$ref": "#/definitions/ActivePermissionProfileModification"
-          },
-          "type": "array"
         }
       },
       "required": [
@@ -33,31 +25,6 @@
       ],
       "type": "object"
     },
-    "ActivePermissionProfileModification": {
-      "oneOf": [
-        {
-          "description": "Additional concrete directory that should be writable.",
-          "properties": {
-            "path": {
-              "$ref": "#/definitions/AbsolutePathBuf"
-            },
-            "type": {
-              "enum": [
-                "additionalWritableRoot"
-              ],
-              "title": "AdditionalWritableRootActivePermissionProfileModificationType",
-              "type": "string"
-            }
-          },
-          "required": [
-            "path",
-            "type"
-          ],
-          "title": "AdditionalWritableRootActivePermissionProfileModification",
-          "type": "object"
-        }
-      ]
-    },
     "AgentPath": {
       "type": "string"
     },
@@ -1160,13 +1127,6 @@
               ],
               "title": "WorkspaceWriteSandboxPolicyType",
               "type": "string"
-            },
-            "writableRoots": {
-              "default": [],
-              "items": {
-                "$ref": "#/definitions/AbsolutePathBuf"
-              },
-              "type": "array"
             }
           },
           "required": [