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/memories/write/src/phase2.rs

@@ -17,9 +17,15 @@ use codex_config::Constrained;
 use codex_core::config::Config;
 use codex_features::Feature;
 use codex_protocol::ThreadId;
+use codex_protocol::models::PermissionProfile;
+use codex_protocol::permissions::FileSystemAccessMode;
+use codex_protocol::permissions::FileSystemPath;
+use codex_protocol::permissions::FileSystemSandboxEntry;
+use codex_protocol::permissions::FileSystemSandboxPolicy;
+use codex_protocol::permissions::FileSystemSpecialPath;
+use codex_protocol::permissions::NetworkSandboxPolicy;
 use codex_protocol::protocol::AgentStatus;
 use codex_protocol::protocol::AskForApproval;
-use codex_protocol::protocol::SandboxPolicy;
 use codex_protocol::protocol::TokenUsage;
 use codex_protocol::user_input::UserInput;
 use codex_state::Stage1Output;
@@ -315,18 +321,25 @@ mod agent {
             .features
             .disable(Feature::SkillMcpDependencyInstall);
 
-        // Sandbox policy
-        let writable_roots = vec![root];
         // The consolidation agent only needs local memory-root write access and no network.
-        let consolidation_sandbox_policy = SandboxPolicy::WorkspaceWrite {
-            writable_roots,
-            network_access: false,
-            exclude_tmpdir_env_var: true,
-            exclude_slash_tmp: true,
-        };
+        let file_system_policy = FileSystemSandboxPolicy::restricted(vec![
+            FileSystemSandboxEntry {
+                path: FileSystemPath::Special {
+                    value: FileSystemSpecialPath::Root,
+                },
+                access: FileSystemAccessMode::Read,
+            },
+            FileSystemSandboxEntry {
+                path: FileSystemPath::Path { path: root },
+                access: FileSystemAccessMode::Write,
+            },
+        ]);
         agent_config
             .permissions
-            .set_legacy_sandbox_policy(consolidation_sandbox_policy, agent_config.cwd.as_path())
+            .set_permission_profile(PermissionProfile::from_runtime_permissions(
+                &file_system_policy,
+                NetworkSandboxPolicy::Restricted,
+            ))
             .ok()?;
 
         agent_config.model = Some(