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## Why This continues the permissions migration by making legacy config default resolution produce the canonical `PermissionProfile` first. The legacy `SandboxPolicy` projection should stay available at compatibility boundaries, but config loading should not create a legacy policy just to immediately convert it back into a profile. Specifically, when `default_permissions` is not specified in `config.toml`, instead of creating a `SandboxPolicy` in `codex-rs/core/src/config/mod.rs` and then trying to derive a `PermissionProfile` from it, we use `derive_permission_profile()` to create a more faithful `PermissionProfile` using the values of `ConfigToml` directly. This also keeps the existing behavior of `sandbox_workspace_write` and extra writable roots after #19841 replaced `:cwd` with `:project_roots`. Legacy workspace-write defaults are represented as symbolic `:project_roots` write access plus symbolic project-root metadata carveouts. Extra absolute writable roots are still added directly and continue to get concrete metadata protections for paths that exist under those roots. The platform sandboxes differ when a symbolic project-root subpath does not exist yet. * **Seatbelt** can encode literal/subpath exclusions directly, so macOS emits project-root metadata subpath policies even if `.git`, `.agents`, or `.codex` do not exist. * **bwrap** has to materialize bind-mount targets. Binding `/dev/null` to a missing `.git` can create a host-visible placeholder that changes Git repo discovery. Binding missing `.agents` would not affect Git discovery, but it would still create a host-visible project metadata placeholder from an automatic compatibility carveout. Linux therefore skips only missing automatic `.git` and `.agents` read-only metadata masks; missing `.codex` remains protected so first-time project config creation goes through the protected-path approval flow. User-authored `read` and `none` subpath rules keep normal bwrap behavior, and `none` can still mask the first missing component to prevent creation under writable roots. ## What Changed - Adds profile-native helpers for legacy workspace-write semantics, including `PermissionProfile::workspace_write_with()`, `FileSystemSandboxPolicy::workspace_write()`, and `FileSystemSandboxPolicy::with_additional_legacy_workspace_writable_roots()`. - Makes `FileSystemSandboxPolicy::workspace_write()` the single legacy workspace-write constructor so both `from_legacy_sandbox_policy()` and `From<&SandboxPolicy>` include the project-root metadata carveouts. - Removes the no-carveout `legacy_workspace_write_base_policy()` path and the `prune_read_entries_under_writable_roots()` cleanup that was only needed by that split construction. - Adds `ConfigToml::derive_permission_profile()` for legacy sandbox-mode fallback resolution; named `default_permissions` profiles continue through the permissions profile pipeline instead of being reconstructed from `sandbox_mode`. - Updates `Config::load()` to start from the derived profile, validate that it still has a legacy compatibility projection, and apply additional writable roots directly to managed workspace-write filesystem policies. - Updates Linux bwrap argument construction so missing automatic `.git`/`.agents` symbolic project-root read-only carveouts are skipped before emitting bind args; missing `.codex`, user-authored `read`/`none` subpath rules, and existing missing writable-root behavior are preserved. - Adds coverage that legacy workspace-write config produces symbolic project-root metadata carveouts, extra legacy workspace writable roots still protect existing metadata paths such as `.git`, and bwrap skips missing `.git`/`.agents` project-root carveouts while preserving missing `.codex` and user-authored missing subpath rules. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/19772). * #19776 * #19775 * #19774 * #19773 * __->__ #19772