diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 9b4a4e32d4..ad19f6ccd6 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -640,6 +640,7 @@ dependencies = [
  "tokio",
  "tracing",
  "tracing-subscriber",
+ "uuid",
 ]
 
 [[package]]
diff --git a/codex-rs/cli/Cargo.toml b/codex-rs/cli/Cargo.toml
index 943788157b..3bed0b35da 100644
--- a/codex-rs/cli/Cargo.toml
+++ b/codex-rs/cli/Cargo.toml
@@ -36,3 +36,4 @@ tokio = { version = "1", features = [
 ] }
 tracing = "0.1.41"
 tracing-subscriber = "0.3.19"
+uuid = { version = "1", features = ["v4"] }
\ No newline at end of file
diff --git a/codex-rs/cli/src/concurrent/mod.rs b/codex-rs/cli/src/concurrent/mod.rs
new file mode 100644
index 0000000000..f378728a12
--- /dev/null
+++ b/codex-rs/cli/src/concurrent/mod.rs
@@ -0,0 +1,331 @@
+use std::fs::File;
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+
+use anyhow::Context;
+use codex_common::ApprovalModeCliArg;
+use codex_tui::Cli as TuiCli;
+
+/// Attempt to handle a concurrent background run. Returns Ok(true) if a background exec
+/// process was spawned (in which case the caller should NOT start the TUI), or Ok(false)
+/// to proceed with normal interactive execution.
+pub fn maybe_spawn_concurrent(
+    tui_cli: &mut TuiCli,
+    root_raw_overrides: &[String],
+    concurrent: bool,
+    concurrent_automerge: Option<bool>,
+    concurrent_branch_name: &Option<String>,
+) -> anyhow::Result<bool> {
+    if !concurrent { return Ok(false); }
+
+    // Enforce autonomous execution conditions when running interactive mode.
+    // Validate git repository presence (required for --concurrent) only if we're in interactive path.
+    {
+        let dir_to_check = tui_cli
+            .cwd
+            .clone()
+            .unwrap_or_else(|| std::env::current_dir().unwrap_or_else(|_| PathBuf::from(".")));
+        let status = Command::new("git")
+            .arg("-C")
+            .arg(&dir_to_check)
+            .arg("rev-parse")
+            .arg("--git-dir")
+            .stdout(Stdio::null())
+            .stderr(Stdio::null())
+            .status();
+        if status.as_ref().map(|s| !s.success()).unwrap_or(true) {
+            eprintln!(
+                "Error: --concurrent requires a git repository (directory {:?} is not managed by git).",
+                dir_to_check
+            );
+            std::process::exit(2);
+        }
+    }
+
+    let ap = tui_cli.approval_policy;
+    let approval_on_failure = matches!(ap, Some(ApprovalModeCliArg::OnFailure));
+    let autonomous = tui_cli.full_auto
+        || tui_cli.dangerously_bypass_approvals_and_sandbox
+        || approval_on_failure;
+    if !autonomous {
+        eprintln!(
+            "Error: --concurrent requires autonomous mode. Use one of: --full-auto, --ask-for-approval on-failure, or --dangerously-bypass-approvals-and-sandbox."
+        );
+        std::process::exit(2);
+    }
+    if tui_cli.prompt.is_none() {
+        eprintln!(
+            "Error: --concurrent requires a prompt argument so the agent does not wait for interactive input."
+        );
+        std::process::exit(2);
+    }
+
+    // Build exec args from interactive CLI for autonomous run without TUI (background).
+    let mut exec_args: Vec<String> = Vec::new();
+    if !tui_cli.images.is_empty() {
+        exec_args.push("--image".into());
+        exec_args.push(tui_cli.images.iter().map(|p| p.display().to_string()).collect::<Vec<_>>().join(","));
+    }
+    if let Some(model) = &tui_cli.model { exec_args.push("--model".into()); exec_args.push(model.clone()); }
+    if let Some(profile) = &tui_cli.config_profile { exec_args.push("--profile".into()); exec_args.push(profile.clone()); }
+    if let Some(sandbox) = &tui_cli.sandbox_mode { exec_args.push("--sandbox".into()); exec_args.push(format!("{sandbox:?}").to_lowercase().replace('_', "-")); }
+    if tui_cli.full_auto { exec_args.push("--full-auto".into()); }
+    if tui_cli.dangerously_bypass_approvals_and_sandbox { exec_args.push("--dangerously-bypass-approvals-and-sandbox".into()); }
+    if tui_cli.skip_git_repo_check { exec_args.push("--skip-git-repo-check".into()); }
+    for raw in root_raw_overrides { exec_args.push("-c".into()); exec_args.push(raw.clone()); }
+
+    // Derive a single slug (shared by worktree branch & log filename) from the prompt.
+    let raw_prompt = tui_cli.prompt.as_deref().unwrap_or("");
+    let snippet = raw_prompt.chars().take(32).collect::<String>();
+    let mut slug: String = snippet
+        .chars()
+        .map(|c| if c.is_ascii_alphanumeric() { c.to_ascii_lowercase() } else { '-' })
+        .collect();
+    while slug.contains("--") { slug = slug.replace("--", "-"); }
+    slug = slug.trim_matches('-').to_string();
+    if slug.is_empty() { slug = "prompt".into(); }
+
+    // Determine concurrent defaults from env (no config file), then apply CLI precedence.
+    let env_automerge = parse_env_bool("CONCURRENT_AUTOMERGE");
+    let env_branch_name = std::env::var("CONCURRENT_BRANCH_NAME").ok();
+    let effective_automerge = concurrent_automerge.or(env_automerge).unwrap_or(true);
+    let user_branch_name_opt = concurrent_branch_name.clone().or(env_branch_name);
+    let branch_name_effective = if let Some(bn_raw) = user_branch_name_opt.as_ref() {
+        let bn_trim = bn_raw.trim();
+        if bn_trim.is_empty() { format!("codex/{slug}") } else { bn_trim.to_string() }
+    } else {
+        format!("codex/{slug}")
+    };
+
+    // Unique job id for this concurrent run (used for log file naming instead of slug).
+    let job_id = uuid::Uuid::new_v4().to_string();
+
+    // If user did NOT specify an explicit cwd, create an isolated git worktree.
+    let mut created_worktree: Option<(PathBuf, String)> = None; // (path, branch)
+    let mut original_branch: Option<String> = None;
+    let mut original_commit: Option<String> = None;
+    if tui_cli.cwd.is_none() {
+        // Capture original branch & commit (best-effort).
+        original_branch = git_capture(["rev-parse", "--abbrev-ref", "HEAD"]).ok();
+        original_commit = git_capture(["rev-parse", "HEAD"]).ok();
+        // Use branch_name_effective for branch/worktree name.
+        match create_concurrent_worktree(&branch_name_effective) {
+            Ok(Some((worktree_path, branch_name))) => {
+                println!(
+                    "Created git worktree at {} (branch {}) for concurrent run",
+                    worktree_path.display(), branch_name
+                );
+                exec_args.push("--cd".into());
+                exec_args.push(worktree_path.display().to_string());
+                created_worktree = Some((worktree_path, branch_name));
+            }
+            Ok(None) => {
+                eprintln!("Warning: Not a git repository (skipping worktree creation); running in current directory.");
+            }
+            Err(e) => {
+                eprintln!("Error: failed to create git worktree for --concurrent: {e}");
+                eprintln!("Hint: remove or rename existing branch '{branch_name_effective}', or pass --concurrent-branch-name to choose a unique name.");
+                std::process::exit(3);
+            }
+        }
+    } else if let Some(explicit) = &tui_cli.cwd {
+        exec_args.push("--cd".into());
+        exec_args.push(explicit.display().to_string());
+    }
+
+    // Prompt (safe to unwrap due to earlier validation).
+    if let Some(prompt) = tui_cli.prompt.clone() { exec_args.push(prompt); }
+
+    // Prepare log file path using stable job id (UUID) rather than prompt slug.
+    let log_dir = match codex_base_dir() {
+        Ok(base) => {
+            let d = base.join("log");
+            let _ = std::fs::create_dir_all(&d);
+            d
+        }
+        Err(_) => PathBuf::from("/tmp"),
+    };
+    let log_path = log_dir.join(format!("codex-logs-{}.log", job_id));
+
+    match File::create(&log_path) {
+        Ok(file) => {
+            let file_err = file.try_clone().ok();
+            let mut cmd = Command::new(
+                std::env::current_exe().unwrap_or_else(|_| PathBuf::from("codex"))
+            );
+            cmd.arg("exec");
+            for a in &exec_args { cmd.arg(a); }
+            // Provide metadata for auto merge if we created a worktree.
+            if let Some((wt_path, branch)) = &created_worktree {
+                if effective_automerge { cmd.env("CODEX_CONCURRENT_AUTOMERGE", "1"); }
+                cmd.env("CODEX_CONCURRENT_BRANCH", branch);
+                cmd.env("CODEX_CONCURRENT_WORKTREE", wt_path);
+                if let Some(ob) = &original_branch { cmd.env("CODEX_ORIGINAL_BRANCH", ob); }
+                if let Some(oc) = &original_commit { cmd.env("CODEX_ORIGINAL_COMMIT", oc); }
+                if let Ok(orig_root) = std::env::current_dir() { cmd.env("CODEX_ORIGINAL_ROOT", orig_root); }
+            }
+            cmd.stdout(Stdio::from(file));
+            if let Some(f2) = file_err { cmd.stderr(Stdio::from(f2)); }
+            match cmd.spawn() {
+                Ok(child) => {
+                    if let Some((wt_path, wt_branch)) = &created_worktree {
+                        println!(
+                            "Background Codex exec started in worktree. PID={} job_id={} log={} worktree={} branch={} original_branch={} automerge={}",
+                            child.id(), job_id, log_path.display(), wt_path.display(), wt_branch,
+                            original_branch.as_deref().unwrap_or("?"), effective_automerge
+                        );
+                    } else {
+                        println!(
+                            "Background Codex exec started. PID={} job_id={} log={} automerge={}",
+                            child.id(), job_id, log_path.display(), effective_automerge
+                        );
+                    }
+
+                    // Record job metadata to CODEX_HOME/jobs.jsonl (JSON Lines file).
+                    let record_time = std::time::SystemTime::now()
+                        .duration_since(std::time::UNIX_EPOCH)
+                        .map(|d| d.as_secs())
+                        .unwrap_or(0);
+                    if let Ok(base) = codex_base_dir() {
+                        let jobs_path = base.join("jobs.jsonl");
+                        let record = serde_json::json!({
+                            "job_id": job_id,
+                            "pid": child.id(),
+                            "worktree": created_worktree.as_ref().map(|(p, _)| p.display().to_string()),
+                            "branch": created_worktree.as_ref().map(|(_, b)| b.clone()),
+                            "original_branch": original_branch,
+                            "original_commit": original_commit,
+                            "log_path": log_path.display().to_string(),
+                            "prompt": raw_prompt,
+                            "start_time": record_time,
+                            "automerge": effective_automerge,
+                            "explicit_branch_name": user_branch_name_opt,
+                        });
+                        if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(&jobs_path) {
+                            use std::io::Write;
+                            if let Err(e) = writeln!(f, "{}", record.to_string()) {
+                                eprintln!("Warning: failed writing job record to {}: {e}", jobs_path.display());
+                            }
+                        } else {
+                            eprintln!("Warning: could not open jobs log file at {}", jobs_path.display());
+                        }
+                    }
+                    return Ok(true); // background spawned
+                }
+                Err(e) => {
+                    eprintln!("Failed to start background exec: {e}. Falling back to interactive mode.");
+                }
+            }
+        }
+        Err(e) => {
+            eprintln!(
+                "Failed to create log file {}: {e}. Falling back to interactive mode.",
+                log_path.display()
+            );
+        }
+    }
+
+    Ok(false)
+}
+
+/// Return the base Codex directory under the user's home (~/.codex), creating it if necessary.
+fn codex_base_dir() -> anyhow::Result<PathBuf> {
+    if let Ok(val) = std::env::var("CODEX_HOME") {
+        if !val.is_empty() {
+            return Ok(PathBuf::from(val).canonicalize()?);
+        }
+    }
+    let home = std::env::var_os("HOME").ok_or_else(|| anyhow::anyhow!("Could not find home directory"))?;
+    let base = PathBuf::from(home).join(".codex");
+    std::fs::create_dir_all(&base)?;
+    Ok(base)
+}
+
+/// Attempt to create a git worktree for an isolated concurrent run.
+/// Returns Ok(Some((worktree_path, branch_name))) on success, Ok(None) if not a git repo, and Err on failure.
+fn create_concurrent_worktree(branch_name: &str) -> anyhow::Result<Option<(PathBuf, String)>> {
+    // Determine repository root.
+    let output = Command::new("git").arg("rev-parse").arg("--show-toplevel").output();
+    let repo_root = match output {
+        Ok(out) if out.status.success() => {
+            let s = String::from_utf8_lossy(&out.stdout).trim().to_string();
+            if s.is_empty() { return Ok(None); }
+            PathBuf::from(s)
+        }
+        _ => return Ok(None),
+    };
+
+    // Derive repo name from root directory.
+    let repo_name = repo_root
+        .file_name()
+        .and_then(|s| s.to_str())
+        .unwrap_or("repo");
+
+    // Fast-fail if branch already exists.
+    if Command::new("git")
+        .current_dir(&repo_root)
+        .arg("rev-parse")
+        .arg("--verify")
+        .arg(branch_name)
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status()
+        .map(|s| s.success())
+        .unwrap_or(false) {
+        anyhow::bail!("branch '{branch_name}' already exists");
+    }
+
+    // Construct worktree directory under ~/.codex/worktrees/<repo_name>/.
+    let base_dir = codex_base_dir()?.join("worktrees").join(repo_name);
+    std::fs::create_dir_all(&base_dir)?;
+    let mut worktree_path = base_dir.join(branch_name.replace('/', "-"));
+
+    // Ensure uniqueness if path already exists.
+    if worktree_path.exists() {
+        for i in 1..1000 { // arbitrary cap
+            let candidate = base_dir.join(format!("{}-{}", branch_name.replace('/', "-"), i));
+            if !candidate.exists() { worktree_path = candidate; break; }
+        }
+    }
+
+    // Run: git worktree add -b <branch_name> <path> HEAD
+    let status = Command::new("git")
+        .current_dir(&repo_root)
+        .arg("worktree")
+        .arg("add")
+        .arg("-b")
+        .arg(&branch_name)
+        .arg(&worktree_path)
+        .arg("HEAD")
+        .status()?;
+
+    if !status.success() {
+        anyhow::bail!("git worktree add failed with status {status}");
+    }
+
+    Ok(Some((worktree_path, branch_name.to_string())))
+}
+
+/// Helper: capture trimmed stdout of a git command.
+fn git_capture<I, S>(args: I) -> anyhow::Result<String>
+where
+    I: IntoIterator<Item = S>,
+    S: AsRef<str>,
+{
+    let mut cmd = Command::new("git");
+    for a in args { cmd.arg(a.as_ref()); }
+    let out = cmd.output().context("running git command")?;
+    if !out.status.success() { anyhow::bail!("git command failed"); }
+    Ok(String::from_utf8_lossy(&out.stdout).trim().to_string())
+}
+
+/// Parse common boolean environment variable representations.
+fn parse_env_bool(name: &str) -> Option<bool> {
+    let raw = std::env::var(name).ok()?;
+    let lower = raw.to_ascii_lowercase();
+    match lower.as_str() {
+        "1" | "true" | "yes" | "on" => Some(true),
+        "0" | "false" | "no" | "off" => Some(false),
+        _ => None,
+    }
+} 
\ No newline at end of file
diff --git a/codex-rs/cli/src/lib.rs b/codex-rs/cli/src/lib.rs
index c6d80c0adf..8498f50617 100644
--- a/codex-rs/cli/src/lib.rs
+++ b/codex-rs/cli/src/lib.rs
@@ -1,3 +1,4 @@
+pub mod concurrent;
 pub mod debug_sandbox;
 mod exit_status;
 pub mod login;
diff --git a/codex-rs/cli/src/main.rs b/codex-rs/cli/src/main.rs
index 7e23782d75..f7296732cd 100644
--- a/codex-rs/cli/src/main.rs
+++ b/codex-rs/cli/src/main.rs
@@ -4,6 +4,7 @@ use clap_complete::Shell;
 use clap_complete::generate;
 use codex_chatgpt::apply_command::ApplyCommand;
 use codex_chatgpt::apply_command::run_apply_command;
+use codex_cli::concurrent::maybe_spawn_concurrent;
 use codex_cli::LandlockCommand;
 use codex_cli::SeatbeltCommand;
 use codex_cli::login::run_login_with_chatgpt;
@@ -32,6 +33,21 @@ struct MultitoolCli {
     #[clap(flatten)]
     interactive: TuiCli,
 
+    /// Autonomous mode: run the command in the background & concurrently using a git worktree.
+    /// Requires the current directory (or --cd provided path) to be a git repository.
+    #[clap(long)]
+    concurrent: bool,
+
+    /// Control whether the concurrent run auto-merges the worktree branch back into the original branch.
+    /// Defaults to true (may also be set via CONCURRENT_AUTOMERGE env var).
+    #[clap(long = "concurrent-automerge", value_name = "BOOL")]
+    concurrent_automerge: Option<bool>,
+
+    /// Explicit branch name to use for the concurrent worktree instead of the default `codex/<slug>`.
+    /// May also be set via CONCURRENT_BRANCH_NAME env var.
+    #[clap(long = "concurrent-branch-name", value_name = "BRANCH")]
+    concurrent_branch_name: Option<String>,
+
     #[clap(subcommand)]
     subcommand: Option<Subcommand>,
 }
@@ -104,8 +120,21 @@ async fn cli_main(codex_linux_sandbox_exe: Option<PathBuf>) -> anyhow::Result<()
     match cli.subcommand {
         None => {
             let mut tui_cli = cli.interactive;
+            let root_raw_overrides = cli.config_overrides.raw_overrides.clone();
             prepend_config_flags(&mut tui_cli.config_overrides, cli.config_overrides);
-            codex_tui::run_main(tui_cli, codex_linux_sandbox_exe)?;
+            // Attempt concurrent background spawn; if it returns true we skip launching the TUI.
+            if let Ok(spawned) = maybe_spawn_concurrent(
+                &mut tui_cli,
+                &root_raw_overrides,
+                cli.concurrent,
+                cli.concurrent_automerge,
+                &cli.concurrent_branch_name,
+            ) {
+                if !spawned { codex_tui::run_main(tui_cli, codex_linux_sandbox_exe)?; }
+            } else {
+                // On error fallback to interactive.
+                codex_tui::run_main(tui_cli, codex_linux_sandbox_exe)?;
+            }
         }
         Some(Subcommand::Exec(mut exec_cli)) => {
             prepend_config_flags(&mut exec_cli.config_overrides, cli.config_overrides);
diff --git a/codex-rs/exec/src/lib.rs b/codex-rs/exec/src/lib.rs
index 620ab82327..f62313d0b1 100644
--- a/codex-rs/exec/src/lib.rs
+++ b/codex-rs/exec/src/lib.rs
@@ -237,6 +237,13 @@ pub async fn run_main(cli: Cli, codex_linux_sandbox_exe: Option<PathBuf>) -> any
         }
     }
 
+    // If running in concurrent auto-merge mode, attempt to commit and merge original branch.
+    if std::env::var("CODEX_CONCURRENT_AUTOMERGE").ok().as_deref() == Some("1") {
+        if let Err(e) = auto_commit_and_fast_forward_original_branch() {
+            eprintln!("[codex-concurrent] Auto-merge skipped: {e}");
+        }
+    }
+
     Ok(())
 }
 
@@ -261,3 +268,88 @@ fn handle_last_message(
     }
     Ok(())
 }
+
+/// Auto-commit changes in the concurrent worktree branch and integrate them back into the original branch.
+/// Strategy:
+/// 1. Commit any pending changes on the concurrent branch.
+/// 2. Checkout the original branch in the original root and perform a --no-ff merge.
+/// Safety: Only performs merge operations if repository state allows; on conflicts it aborts and reports.
+fn auto_commit_and_fast_forward_original_branch() -> anyhow::Result<()> {
+    use std::process::Command;
+    let concurrent_branch = std::env::var("CODEX_CONCURRENT_BRANCH").ok().ok_or_else(|| anyhow::anyhow!("missing concurrent branch env"))?;
+    let original_branch = std::env::var("CODEX_ORIGINAL_BRANCH").ok().ok_or_else(|| anyhow::anyhow!("missing original branch env"))?;
+    let original_commit = std::env::var("CODEX_ORIGINAL_COMMIT").ok().ok_or_else(|| anyhow::anyhow!("missing original commit env"))?;
+    let worktree_dir_env = std::env::var("CODEX_CONCURRENT_WORKTREE").ok();
+    let original_root_env = std::env::var("CODEX_ORIGINAL_ROOT").ok();
+
+    // Determine directory to run git commit for concurrent branch (worktree if provided, else repo root from rev-parse).
+    let worktree_dir = if let Some(wt) = worktree_dir_env.clone() {
+        std::path::PathBuf::from(wt)
+    } else {
+        let repo_root = Command::new("git").args(["rev-parse", "--show-toplevel"]).output()?;
+        if !repo_root.status.success() { anyhow::bail!("not a git repo"); }
+        std::path::PathBuf::from(String::from_utf8_lossy(&repo_root.stdout).trim().to_string())
+    };
+
+    // Commit pending changes (git add ., git commit -m ...).
+    let status_out = Command::new("git")
+        .current_dir(&worktree_dir)
+        .args(["status", "--porcelain"]).output()?;
+    if !status_out.status.success() { anyhow::bail!("git status failed"); }
+    if !status_out.stdout.is_empty() {
+        let add_status = Command::new("git")
+            .current_dir(&worktree_dir)
+            .args(["add", "."]).status()?;
+        if !add_status.success() { anyhow::bail!("git add failed"); }
+        let commit_msg = format!("Codex concurrent run auto-commit on branch {concurrent_branch}");
+        let commit_status = Command::new("git")
+            .current_dir(&worktree_dir)
+            .args(["commit", "-m", &commit_msg]).status()?;
+        if !commit_status.success() { anyhow::bail!("git commit failed"); }
+        eprintln!("[codex-concurrent] Created commit in {concurrent_branch}.");
+    } else {
+        eprintln!("[codex-concurrent] No changes to commit in {concurrent_branch}.");
+    }
+
+    // Capture head of concurrent branch (for potential future use / diagnostics).
+    let concurrent_head_out = Command::new("git")
+        .current_dir(&worktree_dir)
+        .args(["rev-parse", &concurrent_branch]).output()?;
+    if !concurrent_head_out.status.success() { anyhow::bail!("failed to rev-parse concurrent branch"); }
+
+    // Determine where to integrate (original root if known, else worktree).
+    let integration_dir = if let Some(root) = original_root_env.clone() { std::path::PathBuf::from(root) } else { worktree_dir.clone() };
+
+    // Checkout original branch.
+    let co_status = Command::new("git")
+        .current_dir(&integration_dir)
+        .args(["checkout", &original_branch])
+        .status()?;
+    if !co_status.success() { anyhow::bail!("git checkout {original_branch} failed in original root"); }
+
+    // Check if concurrent branch already merged (ancestor test).
+    let ancestor_status = Command::new("git")
+        .current_dir(&integration_dir)
+        .args(["merge-base", "--is-ancestor", &concurrent_branch, &original_branch])
+        .status();
+    if let Ok(code) = ancestor_status {
+        if code.success() {
+            eprintln!("[codex-concurrent] {concurrent_branch} already merged into {original_branch}; skipping.");
+            return Ok(());
+        }
+    }
+
+    // Perform a --no-ff merge.
+    let merge_msg = format!("Merge concurrent Codex branch {concurrent_branch} (base {original_commit})");
+    let merge_status = Command::new("git")
+        .current_dir(&integration_dir)
+        .args(["merge", "--no-ff", &concurrent_branch, "-m", &merge_msg])
+        .status()?;
+    if !merge_status.success() {
+        let _ = Command::new("git").current_dir(&integration_dir).args(["merge", "--abort"]).status();
+        anyhow::bail!("git merge --no-ff failed (conflicts?)");
+    }
+    eprintln!("[codex-concurrent] Merged {concurrent_branch} into {original_branch} in original root: {}", integration_dir.display());
+
+    Ok(())
+}