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## Why `PermissionProfile` is becoming the canonical permissions shape shared by core and app-server. After app-server responses expose the active profile, clients need to be able to send that same shape back when starting, resuming, forking, or overriding a turn instead of translating through the legacy `sandbox`/`sandboxPolicy` shorthands. This still needs to preserve the existing requirements/platform enforcement model. A profile-shaped request can be downgraded or rejected by constraints, but the server should keep the user's elevated-access intent for project trust decisions. Turn-level profile overrides also need to retain existing read protections, including deny-read entries and bounded glob-scan metadata, so a permission override cannot accidentally drop configured protections such as `**/*.env = deny`. ## What changed - Adds optional `permissionProfile` request fields to `thread/start`, `thread/resume`, `thread/fork`, and `turn/start`. - Rejects ambiguous requests that specify both `permissionProfile` and the legacy `sandbox`/`sandboxPolicy` fields, including running-thread resume requests. - Converts profile-shaped overrides into core runtime filesystem/network permissions while continuing to derive the constrained legacy sandbox projection used by existing execution paths. - Preserves project-trust intent for profile overrides that are equivalent to workspace-write or full-access sandbox requests. - Preserves existing deny-read entries and `globScanMaxDepth` when applying turn-level `permissionProfile` overrides. - Updates app-server docs plus generated JSON/TypeScript schema fixtures and regression coverage. ## Verification - `cargo test -p codex-app-server-protocol schema_fixtures` - `cargo test -p codex-core session_configuration_apply_permission_profile_preserves_existing_deny_read_entries` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/18279). * #18288 * #18287 * #18286 * #18285 * #18284 * #18283 * #18282 * #18281 * #18280 * __->__ #18279