## Summary SendUserTurn has not been correctly handling updates to policies. While the tui protocol handles this in `Op::OverrideTurnContext`, the SendUserTurn should be appending `EnvironmentContext` messages when the sandbox settings change. MCP client behavior should match the cli behavior, so we update `SendUserTurn` message to match. ## Testing - [x] Added prompt caching tests
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this
macOS
Expects /usr/bin/sandbox-exec to be present.
Linux
Expects the binary containing codex-core to run the equivalent of codex debug landlock when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
All Platforms
Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.