package: include zsh fork in Codex package

Summary:
- add a checked-in codex-zsh DotSlash manifest for supported Unix targets
- fetch the matching zsh fork artifact during package builds and install it at codex-resources/zsh/bin/zsh when available
- expose the bundled zsh fork through install-context and use it as the runtime zsh path for packaged installs
- remove the user/profile zsh_path config override now that the fork is package-managed
- update app-server zsh-fork integration tests to spawn from a temporary package layout instead of configuring zsh_path directly
- use copyfile for package executable staging so local package smoke tests do not preserve platform-specific source metadata

Test Plan:
- just fmt
- just write-config-schema
- just fix -p codex-config -p codex-core -p codex-exec
- just fix -p codex-app-server
- python3 -m py_compile scripts/codex_package/cli.py scripts/codex_package/layout.py scripts/codex_package/zsh.py
- python3 -m unittest discover scripts/codex_package
- cargo test -p codex-core default_zsh_path_sets_runtime_zsh_path
- cargo test -p codex-core session_new_fails_when_zsh_fork_enabled_without_packaged_zsh
- cargo test -p codex-core restricted_read_implicitly_allows_helper_executables
- cargo test -p codex-config
- cargo test -p codex-app-server turn_start_shell_zsh_fork_executes_command_v2
- cargo test -p codex-app-server turn_start_shell_zsh_fork

codex-rs/Cargo.lock

@@ -1905,6 +1905,7 @@ dependencies = [
  "codex-git-utils",
  "codex-guardian",
  "codex-hooks",
+ "codex-install-context",
  "codex-login",
  "codex-mcp",
  "codex-memories-extension",
@@ -2711,6 +2712,7 @@ dependencies = [
  "codex-core",
  "codex-feedback",
  "codex-git-utils",
+ "codex-install-context",
  "codex-login",
  "codex-model-provider-info",
  "codex-otel",
@@ -3143,6 +3145,7 @@ dependencies = [
  "codex-core",
  "codex-exec-server",
  "codex-extension-api",
+ "codex-install-context",
  "codex-login",
  "codex-protocol",
  "codex-shell-command",

codex-rs/app-server/Cargo.toml

@@ -45,6 +45,7 @@ codex-guardian = { workspace = true }
 codex-git-utils = { workspace = true }
 codex-file-watcher = { workspace = true }
 codex-hooks = { workspace = true }
+codex-install-context = { workspace = true }
 codex-otel = { workspace = true }
 codex-plugin = { workspace = true }
 codex-shell-command = { workspace = true }

codex-rs/app-server/src/config_manager.rs

@@ -9,6 +9,7 @@ use codex_core::config::Config;
 use codex_core::config::ConfigOverrides;
 use codex_exec_server::LOCAL_FS;
 use codex_features::feature_for_key;
+use codex_install_context::InstallContext;
 use codex_login::AuthManager;
 use codex_login::default_client::set_default_client_residency_requirement;
 use codex_utils_absolute_path::AbsolutePathBuf;
@@ -159,6 +160,7 @@ impl ConfigManager {
             .await?;
         self.apply_runtime_feature_enablement(&mut config);
         self.apply_arg0_paths(&mut config);
+        apply_default_zsh_path(&mut config);
         Ok(config)
     }
 
@@ -180,6 +182,7 @@ impl ConfigManager {
         }
         self.apply_runtime_feature_enablement(&mut config);
         self.apply_arg0_paths(&mut config);
+        apply_default_zsh_path(&mut config);
         Ok(config)
     }
 
@@ -219,6 +222,11 @@ impl ConfigManager {
         typesafe_overrides: ConfigOverrides,
         fallback_cwd: Option<PathBuf>,
     ) -> std::io::Result<Config> {
+        let mut typesafe_overrides = typesafe_overrides;
+        if typesafe_overrides.default_zsh_path.is_none() {
+            typesafe_overrides.default_zsh_path = default_zsh_path();
+        }
+
         let merged_cli_overrides = cli_overrides
             .iter()
             .cloned()
@@ -319,6 +327,18 @@ impl ConfigManager {
     }
 }
 
+fn apply_default_zsh_path(config: &mut Config) {
+    if config.zsh_path.is_none() {
+        config.zsh_path = default_zsh_path();
+    }
+}
+
+fn default_zsh_path() -> Option<PathBuf> {
+    InstallContext::current()
+        .bundled_zsh_path()
+        .map(AbsolutePathBuf::into_path_buf)
+}
+
 pub(crate) fn protected_feature_keys(config_layer_stack: &ConfigLayerStack) -> BTreeSet<String> {
     let mut protected_features = config_layer_stack
         .effective_config()

codex-rs/app-server/tests/common/mcp_process.rs

@@ -173,6 +173,20 @@ impl McpProcess {
         .await
     }
 
+    pub async fn new_with_program_and_env(
+        codex_home: &Path,
+        program: &Path,
+        env_overrides: &[(&str, Option<&str>)],
+    ) -> anyhow::Result<Self> {
+        Self::new_with_program_env_and_args(
+            codex_home,
+            program,
+            env_overrides,
+            &[DISABLE_PLUGIN_STARTUP_TASKS_ARG],
+        )
+        .await
+    }
+
     async fn new_with_env_and_args(
         codex_home: &Path,
         env_overrides: &[(&str, Option<&str>)],
@@ -180,6 +194,15 @@ impl McpProcess {
     ) -> anyhow::Result<Self> {
         let program = codex_utils_cargo_bin::cargo_bin("codex-app-server")
             .context("should find binary for codex-app-server")?;
+        Self::new_with_program_env_and_args(codex_home, &program, env_overrides, args).await
+    }
+
+    async fn new_with_program_env_and_args(
+        codex_home: &Path,
+        program: &Path,
+        env_overrides: &[(&str, Option<&str>)],
+        args: &[&str],
+    ) -> anyhow::Result<Self> {
         let mut cmd = Command::new(program);
 
         cmd.stdin(Stdio::piped());

codex-rs/app-server/tests/suite/v2/turn_start_zsh_fork.rs

@@ -37,6 +37,7 @@ use core_test_support::skip_if_no_network;
 use pretty_assertions::assert_eq;
 use std::collections::BTreeMap;
 use std::path::Path;
+use std::path::PathBuf;
 use tempfile::TempDir;
 use tokio::time::timeout;
 
@@ -94,10 +95,9 @@ async fn turn_start_shell_zsh_fork_executes_command_v2() -> Result<()> {
             (Feature::UnifiedExec, false),
             (Feature::ShellSnapshot, false),
         ]),
-        &zsh_path,
     )?;
 
-    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace).await?;
+    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace, &zsh_path).await?;
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
 
     let start_id = mcp
@@ -162,7 +162,7 @@ async fn turn_start_shell_zsh_fork_executes_command_v2() -> Result<()> {
     };
     assert_eq!(id, "call-zsh-fork");
     assert_eq!(status, CommandExecutionStatus::InProgress);
-    assert!(command.starts_with(&zsh_path.display().to_string()));
+    assert!(command.starts_with(&packaged_zsh_path(&codex_home).display().to_string()));
     assert!(command.contains("/bin/sh -c"));
     assert!(command.contains("sleep 0.01"));
     assert!(command.contains(&release_marker.display().to_string()));
@@ -213,10 +213,9 @@ async fn turn_start_shell_zsh_fork_exec_approval_decline_v2() -> Result<()> {
             (Feature::UnifiedExec, false),
             (Feature::ShellSnapshot, false),
         ]),
-        &zsh_path,
     )?;
 
-    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace).await?;
+    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace, &zsh_path).await?;
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
 
     let start_id = mcp
@@ -346,10 +345,9 @@ async fn turn_start_shell_zsh_fork_exec_approval_cancel_v2() -> Result<()> {
             (Feature::UnifiedExec, false),
             (Feature::ShellSnapshot, false),
         ]),
-        &zsh_path,
     )?;
 
-    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace).await?;
+    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace, &zsh_path).await?;
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
 
     let start_id = mcp
@@ -505,10 +503,9 @@ async fn turn_start_shell_zsh_fork_subcommand_decline_marks_parent_declined_v2()
             (Feature::UnifiedExec, false),
             (Feature::ShellSnapshot, false),
         ]),
-        &zsh_path,
     )?;
 
-    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace).await?;
+    let mut mcp = create_zsh_test_mcp_process(&codex_home, &workspace, &zsh_path).await?;
     timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
 
     let start_id = mcp
@@ -603,7 +600,8 @@ async fn turn_start_shell_zsh_fork_subcommand_decline_marks_parent_declined_v2()
             );
             approved_subcommand_strings.push(approval_command.to_string());
         }
-        let is_parent_approval = approval_command.contains(&zsh_path.display().to_string())
+        let is_parent_approval = approval_command
+            .contains(&packaged_zsh_path(&codex_home).display().to_string())
             && (approval_command.contains(&shell_command)
                 || (has_first_file && has_second_file)
                 || approval_command.contains(&parent_shell_hint));
@@ -738,9 +736,53 @@ async fn turn_start_shell_zsh_fork_subcommand_decline_marks_parent_declined_v2()
     Ok(())
 }
 
-async fn create_zsh_test_mcp_process(codex_home: &Path, zdotdir: &Path) -> Result<McpProcess> {
+async fn create_zsh_test_mcp_process(
+    codex_home: &Path,
+    zdotdir: &Path,
+    zsh_path: &Path,
+) -> Result<McpProcess> {
+    let app_server = create_test_package_app_server(codex_home, zsh_path)?;
     let zdotdir = zdotdir.to_string_lossy().into_owned();
-    McpProcess::new_with_env(codex_home, &[("ZDOTDIR", Some(zdotdir.as_str()))]).await
+    McpProcess::new_with_program_and_env(
+        codex_home,
+        &app_server,
+        &[("ZDOTDIR", Some(zdotdir.as_str()))],
+    )
+    .await
+}
+
+fn create_test_package_app_server(codex_home: &Path, zsh_path: &Path) -> Result<PathBuf> {
+    let package_dir = codex_home.join("test-package");
+    let bin_dir = package_dir.join("bin");
+    let package_zsh_path = packaged_zsh_path(codex_home);
+    let Some(zsh_bin_dir) = package_zsh_path.parent() else {
+        anyhow::bail!("packaged zsh path should have parent");
+    };
+    std::fs::create_dir_all(&bin_dir)?;
+    std::fs::create_dir_all(zsh_bin_dir)?;
+    std::fs::write(package_dir.join("codex-package.json"), "{}")?;
+
+    let app_server = bin_dir.join("codex-app-server");
+    copy_with_permissions(
+        &codex_utils_cargo_bin::cargo_bin("codex-app-server")?,
+        &app_server,
+    )?;
+    copy_with_permissions(zsh_path, &package_zsh_path)?;
+    Ok(app_server)
+}
+
+fn packaged_zsh_path(codex_home: &Path) -> PathBuf {
+    codex_home
+        .join("test-package")
+        .join("codex-resources")
+        .join("zsh")
+        .join("bin")
+        .join("zsh")
+}
+
+fn copy_with_permissions(source: &Path, destination: &Path) -> std::io::Result<()> {
+    std::fs::copy(source, destination)?;
+    std::fs::set_permissions(destination, std::fs::metadata(source)?.permissions())
 }
 
 fn create_config_toml(
@@ -748,7 +790,6 @@ fn create_config_toml(
     server_uri: &str,
     approval_policy: &str,
     feature_flags: &BTreeMap<Feature, bool>,
-    zsh_path: &Path,
 ) -> std::io::Result<()> {
     let mut features = BTreeMap::from([(Feature::RemoteModels, false)]);
     for (feature, enabled) in feature_flags {
@@ -774,7 +815,6 @@ fn create_config_toml(
 model = "mock-model"
 approval_policy = "{approval_policy}"
 sandbox_mode = "read-only"
-zsh_path = "{zsh_path}"
 
 model_provider = "mock_provider"
 
@@ -787,9 +827,7 @@ base_url = "{server_uri}/v1"
 wire_api = "responses"
 request_max_retries = 0
 stream_max_retries = 0
-"#,
-            approval_policy = approval_policy,
-            zsh_path = zsh_path.display()
+"#
         ),
     )
 }

codex-rs/cli/src/doctor.rs

@@ -506,6 +506,7 @@ fn config_overrides_from_interactive(
         codex_self_exe: arg0_paths.codex_self_exe.clone(),
         codex_linux_sandbox_exe: arg0_paths.codex_linux_sandbox_exe.clone(),
         main_execve_wrapper_exe: arg0_paths.main_execve_wrapper_exe.clone(),
+        default_zsh_path: crate::default_zsh_path(),
         show_raw_agent_reasoning: interactive.oss.then_some(true),
         additional_writable_roots: interactive.add_dir.clone(),
         ..Default::default()

codex-rs/cli/src/main.rs

@@ -71,6 +71,7 @@ use codex_core::config::resolve_profile_v2_config_path;
 use codex_features::FEATURES;
 use codex_features::Stage;
 use codex_features::is_known_feature_key;
+use codex_install_context::InstallContext;
 use codex_login::AuthManager;
 use codex_login::CodexAuth;
 use codex_login::read_codex_access_token_from_env;
@@ -1557,6 +1558,12 @@ async fn load_exec_server_config(
         .await?)
 }
 
+pub(crate) fn default_zsh_path() -> Option<PathBuf> {
+    InstallContext::current()
+        .bundled_zsh_path()
+        .map(AbsolutePathBuf::into_path_buf)
+}
+
 async fn load_exec_server_remote_auth(
     config: &codex_core::config::Config,
     missing_auth_error: &'static str,
@@ -1681,6 +1688,7 @@ async fn run_debug_prompt_input_command(
         codex_self_exe: arg0_paths.codex_self_exe,
         codex_linux_sandbox_exe: arg0_paths.codex_linux_sandbox_exe,
         main_execve_wrapper_exe: arg0_paths.main_execve_wrapper_exe,
+        default_zsh_path: default_zsh_path(),
         show_raw_agent_reasoning: shared.oss.then_some(true),
         ephemeral: Some(true),
         bypass_hook_trust: shared.bypass_hook_trust.then_some(true),

codex-rs/config/src/config_toml.rs

@@ -291,9 +291,6 @@ pub struct ConfigToml {
     #[schemars(skip)]
     pub js_repl_node_module_dirs: Option<Vec<AbsolutePathBuf>>,
 
-    /// Optional absolute path to patched zsh used by zsh-exec-bridge-backed shell execution.
-    pub zsh_path: Option<AbsolutePathBuf>,
-
     /// Profile to use from the `profiles` map.
     pub profile: Option<String>,
 

codex-rs/config/src/profile_toml.rs

@@ -48,8 +48,6 @@ pub struct ConfigProfile {
     /// Deprecated: ignored.
     #[schemars(skip)]
     pub js_repl_node_module_dirs: Option<Vec<AbsolutePathBuf>>,
-    /// Optional absolute path to patched zsh used by zsh-exec-bridge-backed shell execution.
-    pub zsh_path: Option<AbsolutePathBuf>,
     pub experimental_compact_prompt_file: Option<AbsolutePathBuf>,
     pub include_permissions_instructions: Option<bool>,
     pub include_apps_instructions: Option<bool>,

codex-rs/core/config.schema.json

@@ -711,14 +711,6 @@
             }
           ],
           "default": null
-        },
-        "zsh_path": {
-          "allOf": [
-            {
-              "$ref": "#/definitions/AbsolutePathBuf"
-            }
-          ],
-          "description": "Optional absolute path to patched zsh used by zsh-exec-bridge-backed shell execution."
         }
       },
       "type": "object"
@@ -4986,14 +4978,6 @@
       ],
       "default": null,
       "description": "Windows-specific configuration."
-    },
-    "zsh_path": {
-      "allOf": [
-        {
-          "$ref": "#/definitions/AbsolutePathBuf"
-        }
-      ],
-      "description": "Optional absolute path to patched zsh used by zsh-exec-bridge-backed shell execution."
     }
   },
   "title": "ConfigToml",

codex-rs/core/src/config/config_tests.rs

@@ -4470,6 +4470,25 @@ async fn add_dir_override_extends_workspace_writable_roots() -> std::io::Result<
     Ok(())
 }
 
+#[tokio::test]
+async fn default_zsh_path_sets_runtime_zsh_path() -> std::io::Result<()> {
+    let codex_home = TempDir::new()?;
+    let default_zsh_path = codex_home.path().join("packaged-zsh");
+
+    let config = Config::load_from_base_config_with_overrides(
+        ConfigToml::default(),
+        ConfigOverrides {
+            default_zsh_path: Some(default_zsh_path.clone()),
+            ..Default::default()
+        },
+        codex_home.abs(),
+    )
+    .await?;
+    assert_eq!(config.zsh_path, Some(default_zsh_path));
+
+    Ok(())
+}
+
 #[tokio::test]
 async fn sqlite_home_defaults_to_codex_home_for_workspace_write() -> std::io::Result<()> {
     let codex_home = TempDir::new()?;

codex-rs/core/src/config/mod.rs

@@ -1397,6 +1397,7 @@ impl Config {
             cfg,
             ConfigOverrides {
                 cwd: Some(self.cwd.to_path_buf()),
+                default_zsh_path: refreshed_config.zsh_path.clone(),
                 ..Default::default()
             },
             refreshed_config.codex_home.clone(),
@@ -2128,7 +2129,7 @@ pub struct ConfigOverrides {
     pub codex_self_exe: Option<PathBuf>,
     pub codex_linux_sandbox_exe: Option<PathBuf>,
     pub main_execve_wrapper_exe: Option<PathBuf>,
-    pub zsh_path: Option<PathBuf>,
+    pub default_zsh_path: Option<PathBuf>,
     pub base_instructions: Option<String>,
     pub developer_instructions: Option<String>,
     pub personality: Option<Personality>,
@@ -2480,7 +2481,7 @@ impl Config {
             codex_self_exe,
             codex_linux_sandbox_exe,
             main_execve_wrapper_exe,
-            zsh_path: zsh_path_override,
+            default_zsh_path,
             base_instructions,
             developer_instructions,
             personality,
@@ -3199,7 +3200,7 @@ impl Config {
         )
         .await?;
         let compact_prompt = compact_prompt.or(file_compact_prompt);
-        let zsh_path = zsh_path_override.or(cfg.zsh_path.map(Into::into));
+        let zsh_path = default_zsh_path;
 
         let review_model = override_review_model.or(cfg.review_model);
 

codex-rs/core/src/config/permissions_tests.rs

@@ -82,7 +82,7 @@ async fn restricted_read_implicitly_allows_helper_executables() -> std::io::Resu
         },
         ConfigOverrides {
             cwd: Some(cwd.clone()),
-            zsh_path: Some(zsh_path.clone()),
+            default_zsh_path: Some(zsh_path.clone()),
             main_execve_wrapper_exe: Some(execve_wrapper),
             ..Default::default()
         },

codex-rs/core/src/session/session.rs

@@ -826,13 +826,13 @@ impl Session {
             } else if use_zsh_fork_shell {
                 let zsh_path = config.zsh_path.as_ref().ok_or_else(|| {
                     anyhow::anyhow!(
-                        "zsh fork feature enabled, but `zsh_path` is not configured; set `zsh_path` in config.toml"
+                        "zsh fork feature enabled, but no packaged zsh fork is available for this install"
                     )
                 })?;
                 let zsh_path = zsh_path.to_path_buf();
                 shell::get_shell(shell::ShellType::Zsh, Some(&zsh_path)).ok_or_else(|| {
                     anyhow::anyhow!(
-                        "zsh fork feature enabled, but zsh_path `{}` is not usable; set `zsh_path` to a valid zsh executable",
+                        "zsh fork feature enabled, but packaged zsh fork `{}` is not usable",
                         zsh_path.display()
                     )
                 })?

codex-rs/core/src/session/tests.rs

@@ -4319,7 +4319,7 @@ async fn absolute_cwd_update_with_turn_environment_is_allowed() {
 }
 
 #[tokio::test]
-async fn session_new_fails_when_zsh_fork_enabled_without_zsh_path() {
+async fn session_new_fails_when_zsh_fork_enabled_without_packaged_zsh() {
     let codex_home = tempfile::tempdir().expect("create temp dir");
     let mut config = build_test_config(codex_home.path()).await;
     config
@@ -4420,7 +4420,7 @@ async fn session_new_fails_when_zsh_fork_enabled_without_zsh_path() {
         Err(err) => err,
     };
     let msg = format!("{err:#}");
-    assert!(msg.contains("zsh fork feature enabled, but `zsh_path` is not configured"));
+    assert!(msg.contains("zsh fork feature enabled, but no packaged zsh fork is available"));
 }
 
 // todo: use online model info

codex-rs/exec/Cargo.toml

@@ -32,6 +32,7 @@ codex-config = { workspace = true }
 codex-core = { workspace = true }
 codex-feedback = { workspace = true }
 codex-git-utils = { workspace = true }
+codex-install-context = { workspace = true }
 codex-login = { workspace = true }
 codex-model-provider-info = { workspace = true }
 codex-otel = { workspace = true }

codex-rs/exec/src/lib.rs

@@ -70,6 +70,7 @@ use codex_core::format_exec_policy_error_with_source;
 use codex_core::path_utils;
 use codex_feedback::CodexFeedback;
 use codex_git_utils::get_git_repo_root;
+use codex_install_context::InstallContext;
 use codex_login::AuthConfig;
 use codex_login::default_client::set_default_client_residency_requirement;
 use codex_login::default_client::set_default_originator;
@@ -416,7 +417,9 @@ pub async fn run_main(cli: Cli, arg0_paths: Arg0DispatchPaths) -> anyhow::Result
         codex_self_exe: arg0_paths.codex_self_exe.clone(),
         codex_linux_sandbox_exe: arg0_paths.codex_linux_sandbox_exe.clone(),
         main_execve_wrapper_exe: arg0_paths.main_execve_wrapper_exe.clone(),
-        zsh_path: None,
+        default_zsh_path: InstallContext::current()
+            .bundled_zsh_path()
+            .map(AbsolutePathBuf::into_path_buf),
         base_instructions: None,
         developer_instructions: None,
         personality: None,

codex-rs/install-context/src/lib.rs

@@ -11,6 +11,7 @@ const PATH_DIRNAME: &str = "codex-path";
 const RELEASES_DIRNAME: &str = "releases";
 const RESOURCES_DIRNAME: &str = "codex-resources";
 const STANDALONE_PACKAGES_DIRNAME: &str = "standalone";
+const ZSH_DIRNAME: &str = "zsh";
 static INSTALL_CONTEXT: OnceLock<InstallContext> = OnceLock::new();
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -166,6 +167,18 @@ impl InstallContext {
 
         None
     }
+
+    pub fn bundled_zsh_path(&self) -> Option<AbsolutePathBuf> {
+        if cfg!(windows) {
+            None
+        } else {
+            self.bundled_resource(zsh_resource_path())
+        }
+    }
+
+    pub fn bundled_zsh_bin_dir(&self) -> Option<AbsolutePathBuf> {
+        self.bundled_zsh_path()?.parent()
+    }
 }
 
 impl CodexPackageLayout {
@@ -260,6 +273,10 @@ fn default_rg_command() -> PathBuf {
     }
 }
 
+fn zsh_resource_path() -> PathBuf {
+    PathBuf::from(ZSH_DIRNAME).join(BIN_DIRNAME).join("zsh")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -345,6 +362,11 @@ mod tests {
         fs::write(&exe_path, "")?;
         fs::write(resources_dir.join(TEST_RESOURCE_NAME), "")?;
         fs::write(path_dir.join(default_rg_command()), "")?;
+        if !cfg!(windows) {
+            let zsh_path = resources_dir.join(zsh_resource_path());
+            fs::create_dir_all(zsh_path.parent().expect("zsh path should have parent"))?;
+            fs::write(&zsh_path, "")?;
+        }
         let canonical_package_dir =
             AbsolutePathBuf::from_absolute_path(package_dir.path().canonicalize()?)?;
         let canonical_bin_dir = AbsolutePathBuf::from_absolute_path(bin_dir.canonicalize()?)?;
@@ -382,6 +404,19 @@ mod tests {
             context.bundled_resource(TEST_RESOURCE_NAME),
             Some(canonical_resources_dir.join(TEST_RESOURCE_NAME))
         );
+        if cfg!(windows) {
+            assert_eq!(context.bundled_zsh_path(), None);
+            assert_eq!(context.bundled_zsh_bin_dir(), None);
+        } else {
+            assert_eq!(
+                context.bundled_zsh_path(),
+                Some(canonical_resources_dir.join(zsh_resource_path()))
+            );
+            assert_eq!(
+                context.bundled_zsh_bin_dir(),
+                Some(canonical_resources_dir.join(ZSH_DIRNAME).join(BIN_DIRNAME))
+            );
+        }
         Ok(())
     }
 

codex-rs/mcp-server/Cargo.toml

@@ -23,8 +23,10 @@ codex-config = { workspace = true }
 codex-core = { workspace = true }
 codex-exec-server = { workspace = true }
 codex-extension-api = { workspace = true }
+codex-install-context = { workspace = true }
 codex-login = { workspace = true }
 codex-protocol = { workspace = true }
+codex-utils-absolute-path = { workspace = true }
 codex-utils-cli = { workspace = true }
 codex-utils-json-to-toml = { workspace = true }
 rmcp = { workspace = true }
@@ -43,7 +45,6 @@ tracing = { workspace = true, features = ["log"] }
 tracing-subscriber = { workspace = true, features = ["env-filter", "fmt"] }
 
 [dev-dependencies]
-codex-utils-absolute-path = { workspace = true }
 codex-shell-command = { workspace = true }
 core_test_support = { workspace = true }
 mcp_test_support = { workspace = true }

codex-rs/mcp-server/src/codex_tool_config.rs

@@ -4,6 +4,7 @@ use codex_arg0::Arg0DispatchPaths;
 use codex_core::config::Config;
 use codex_core::config::ConfigBuilder;
 use codex_core::config::ConfigOverrides;
+use codex_install_context::InstallContext;
 use codex_protocol::ThreadId;
 use codex_protocol::config_types::SandboxMode;
 use codex_protocol::protocol::AskForApproval;
@@ -175,6 +176,9 @@ impl CodexToolCallParam {
             codex_self_exe: arg0_paths.codex_self_exe.clone(),
             codex_linux_sandbox_exe: arg0_paths.codex_linux_sandbox_exe.clone(),
             main_execve_wrapper_exe: arg0_paths.main_execve_wrapper_exe.clone(),
+            default_zsh_path: InstallContext::current()
+                .bundled_zsh_path()
+                .map(codex_utils_absolute_path::AbsolutePathBuf::into_path_buf),
             base_instructions,
             developer_instructions,
             compact_prompt,

codex-rs/tui/src/lib.rs

@@ -1851,6 +1851,13 @@ async fn load_config_or_exit_with_fallback_cwd(
     strict_config: bool,
     fallback_cwd: Option<PathBuf>,
 ) -> Config {
+    let mut overrides = overrides;
+    if overrides.default_zsh_path.is_none() {
+        overrides.default_zsh_path = codex_install_context::InstallContext::current()
+            .bundled_zsh_path()
+            .map(AbsolutePathBuf::into_path_buf);
+    }
+
     #[allow(clippy::print_stderr)]
     match ConfigBuilder::default()
         .cli_overrides(cli_kv_overrides)

scripts/codex_package/README.md

@@ -13,6 +13,7 @@ The builder creates a canonical Codex package directory:
 │   └── <entrypoint>[.exe]
 ├── codex-resources
 │   ├── bwrap                             # Linux only
+│   ├── zsh/bin/zsh                       # supported Unix targets only
 │   ├── codex-command-runner.exe          # Windows only
 │   └── codex-windows-sandbox-setup.exe   # Windows only
 └── codex-path
@@ -67,3 +68,9 @@ DotSlash manifest at `scripts/codex_package/rg`. Downloaded archives are cached
 under `$TMPDIR/codex-package/<target>-rg` and are reused only after the recorded
 size and SHA-256 digest have been verified. Pass `--rg-bin` to use a local
 ripgrep executable instead.
+
+The patched zsh fork used by `shell_zsh_fork` is fetched from the DotSlash
+manifest at `scripts/codex_package/codex-zsh` when the selected target has a
+matching prebuilt artifact. Downloaded archives are cached under
+`$TMPDIR/codex-package/<target>-zsh` and installed at
+`codex-resources/zsh/bin/zsh`.

scripts/codex_package/cli.py

@@ -15,6 +15,7 @@ from .targets import TARGET_SPECS
 from .targets import PackageInputs
 from .targets import default_target
 from .targets import resolve_input_path
+from .zsh import resolve_zsh_bin
 from .version import read_workspace_version
 
 
@@ -161,13 +162,14 @@ def main() -> int:
     inputs = PackageInputs(
         entrypoint_bin=source_outputs.entrypoint_bin,
         rg_bin=resolve_rg_bin(spec, args.rg_bin),
+        zsh_bin=resolve_zsh_bin(spec),
         bwrap_bin=source_outputs.bwrap_bin,
         codex_command_runner_bin=source_outputs.codex_command_runner_bin,
         codex_windows_sandbox_setup_bin=source_outputs.codex_windows_sandbox_setup_bin,
     )
     prepare_package_dir(package_dir, force=args.force)
     build_package_dir(package_dir, version, variant, spec, inputs)
-    validate_package_dir(package_dir, variant, spec)
+    validate_package_dir(package_dir, variant, spec, include_zsh=inputs.zsh_bin is not None)
 
     for archive_output in args.archive_output:
         archive_path = archive_output.resolve()

scripts/codex_package/codex-zsh

@@ -0,0 +1,43 @@
+#!/usr/bin/env dotslash
+
+{
+  "name": "codex-zsh",
+  "platforms": {
+    "macos-aarch64": {
+      "size": 358776,
+      "hash": "sha256",
+      "digest": "c6dbb063a0135b947ab1cacc655b2b750874699472f412ec7daba97543a90c3c",
+      "format": "tar.gz",
+      "path": "codex-zsh/bin/zsh",
+      "providers": [
+        {
+          "url": "https://github.com/openai/codex/releases/download/rust-v0.132.0/codex-zsh-aarch64-apple-darwin.tar.gz"
+        }
+      ]
+    },
+    "linux-x86_64": {
+      "size": 433413,
+      "hash": "sha256",
+      "digest": "5f42d9fc8e9c8c399a727512002906006ae9de966ea7b3d87ca36b47efc59938",
+      "format": "tar.gz",
+      "path": "codex-zsh/bin/zsh",
+      "providers": [
+        {
+          "url": "https://github.com/openai/codex/releases/download/rust-v0.132.0/codex-zsh-x86_64-unknown-linux-musl.tar.gz"
+        }
+      ]
+    },
+    "linux-aarch64": {
+      "size": 411653,
+      "hash": "sha256",
+      "digest": "6c6e32c297425db02b4dbffb10925895875d14647fc3eb2f18767be97dc6a945",
+      "format": "tar.gz",
+      "path": "codex-zsh/bin/zsh",
+      "providers": [
+        {
+          "url": "https://github.com/openai/codex/releases/download/rust-v0.132.0/codex-zsh-aarch64-unknown-linux-musl.tar.gz"
+        }
+      ]
+    }
+  }
+}

scripts/codex_package/layout.py

@@ -8,6 +8,7 @@ from pathlib import Path
 from .targets import PackageInputs
 from .targets import PackageVariant
 from .targets import TargetSpec
+from .zsh import ZSH_RESOURCE_PATH
 
 
 LAYOUT_VERSION = 1
@@ -50,6 +51,13 @@ def build_package_dir(
     )
     copy_executable(inputs.rg_bin, path_dir / spec.rg_name, is_windows=spec.is_windows)
 
+    if inputs.zsh_bin is not None:
+        copy_executable(
+            inputs.zsh_bin,
+            resources_dir / ZSH_RESOURCE_PATH,
+            is_windows=False,
+        )
+
     if inputs.bwrap_bin is not None:
         copy_executable(inputs.bwrap_bin, resources_dir / "bwrap", is_windows=False)
 
@@ -83,6 +91,8 @@ def validate_package_dir(
     package_dir: Path,
     variant: PackageVariant,
     spec: TargetSpec,
+    *,
+    include_zsh: bool,
 ) -> None:
     required_dirs = [
         Path("bin"),
@@ -122,6 +132,11 @@ def validate_package_dir(
     ]
     executable_files = list(required_files)
 
+    if include_zsh:
+        zsh_path = Path("codex-resources") / ZSH_RESOURCE_PATH
+        required_files.append(zsh_path)
+        executable_files.append(zsh_path)
+
     if spec.is_linux:
         required_files.append(Path("codex-resources") / "bwrap")
         executable_files.append(Path("codex-resources") / "bwrap")
@@ -148,7 +163,7 @@ def validate_package_dir(
 
 def copy_executable(src: Path, dest: Path, *, is_windows: bool) -> None:
     dest.parent.mkdir(parents=True, exist_ok=True)
-    shutil.copy2(src, dest)
+    shutil.copyfile(src, dest)
     if not is_windows:
         mode = dest.stat().st_mode
         dest.chmod(mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)

scripts/codex_package/targets.py

@@ -40,6 +40,7 @@ class PackageVariant:
 class PackageInputs:
     entrypoint_bin: Path
     rg_bin: Path
+    zsh_bin: Path | None
     bwrap_bin: Path | None
     codex_command_runner_bin: Path | None
     codex_windows_sandbox_setup_bin: Path | None

scripts/codex_package/zsh.py

@@ -0,0 +1,22 @@
+"""Fetch the patched zsh fork used by shell_zsh_fork."""
+
+from pathlib import Path
+
+from .dotslash import fetch_dotslash_executable
+from .targets import REPO_ROOT
+from .targets import TargetSpec
+
+
+ZSH_MANIFEST = REPO_ROOT / "scripts" / "codex_package" / "codex-zsh"
+ZSH_RESOURCE_PATH = Path("zsh") / "bin" / "zsh"
+
+
+def resolve_zsh_bin(spec: TargetSpec) -> Path | None:
+    return fetch_dotslash_executable(
+        spec,
+        manifest_path=ZSH_MANIFEST,
+        artifact_label="codex-zsh",
+        cache_key=f"{spec.target}-zsh",
+        dest_name="zsh",
+        missing_ok=True,
+    )