diff --git a/Cargo.toml b/Cargo.toml
index 2230bb4..8c9d262 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,8 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+rand = "0.9.1"
 serde = { version = "1.0.217", features = ["derive"] }
+tempfile = "3.20.0"
 thiserror = "2.0.11"
 toml = "0.8.19"
diff --git a/src/git.rs b/src/git.rs
new file mode 100644
index 0000000..2b03b5a
--- /dev/null
+++ b/src/git.rs
@@ -0,0 +1,200 @@
+use std::io::Write;
+
+#[derive(Debug, thiserror::Error)]
+pub enum GitError {
+    #[error(transparent)]
+    StdIoError(#[from] std::io::Error),
+    #[error("Oops, something went wrong")]
+    Oops,
+}
+
+#[derive(Debug)]
+/// `Worktree` is a struct that manages a temporary directory containing
+/// a checkout of a specific branch.  The worktree is removed and pruned
+/// when the `Worktree` struct is dropped.
+pub struct Worktree {
+    path: tempfile::TempDir,
+}
+
+impl Drop for Worktree {
+    fn drop(&mut self) {
+        let _result = std::process::Command::new("git")
+            .args(["worktree", "remove", &self.path.path().to_string_lossy()])
+            .output();
+    }
+}
+
+impl Worktree {
+    pub fn new(branch: &str) -> Result<Worktree, GitError> {
+        let path = tempfile::tempdir()?;
+        let result = std::process::Command::new("git")
+            .args(["worktree", "add", &path.path().to_string_lossy(), branch])
+            .output()?;
+        if !result.status.success() {
+            println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+            println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+            return Err(GitError::Oops);
+        }
+        Ok(Self { path })
+    }
+
+    pub fn path(&self) -> &std::path::Path {
+        self.path.as_ref()
+    }
+}
+
+pub fn checkout_branch_in_worktree(
+    branch: &str,
+    worktree_dir: &std::path::Path,
+) -> Result<(), GitError> {
+    let result = std::process::Command::new("git")
+        .args(["worktree", "add", &worktree_dir.to_string_lossy(), branch])
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+    Ok(())
+}
+
+pub fn git_worktree_prune() -> Result<(), GitError> {
+    let result = std::process::Command::new("git")
+        .args(["worktree", "prune"])
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+    Ok(())
+}
+
+pub fn git_remove_branch(branch: &str) -> Result<(), GitError> {
+    let result = std::process::Command::new("git")
+        .args(["branch", "-D", branch])
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+    Ok(())
+}
+
+pub fn git_branch_exists(branch: &str) -> Result<bool, GitError> {
+    let result = std::process::Command::new("git")
+        .args(["show-ref", "--quiet", branch])
+        .output()?;
+    return Ok(result.status.success());
+}
+
+pub fn create_orphan_branch(branch: &str) -> Result<(), GitError> {
+    {
+        let tmp_worktree = tempfile::tempdir().unwrap();
+        create_orphan_branch_at_path(branch, tmp_worktree.path())?;
+    }
+    // The temp dir is now removed / cleaned up.
+
+    let result = std::process::Command::new("git")
+        .args(["worktree", "prune"])
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+
+    Ok(())
+}
+
+fn create_orphan_branch_at_path(
+    branch: &str,
+    worktree_path: &std::path::Path,
+) -> Result<(), GitError> {
+    let worktree_dir = worktree_path.to_string_lossy();
+    let result = std::process::Command::new("git")
+        .args(["worktree", "add", "--orphan", "-b", branch, &worktree_dir])
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+
+    let mut readme_filename = std::path::PathBuf::from(worktree_path);
+    readme_filename.push("README.md");
+    let mut readme = std::fs::File::create(readme_filename)?;
+    write!(
+        readme,
+        "This branch is used by entomologist to track issues."
+    )?;
+
+    let result = std::process::Command::new("git")
+        .args(["add", "README.md"])
+        .current_dir(worktree_path)
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+
+    let result = std::process::Command::new("git")
+        .args(["commit", "-m", "create entomologist issue branch"])
+        .current_dir(worktree_path)
+        .output()?;
+    if !result.status.success() {
+        println!("stdout: {}", std::str::from_utf8(&result.stdout).unwrap());
+        println!("stderr: {}", std::str::from_utf8(&result.stderr).unwrap());
+        return Err(GitError::Oops);
+    }
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_worktree() {
+        let mut p = std::path::PathBuf::new();
+        {
+            let worktree = Worktree::new("origin/main").unwrap();
+
+            p.push(worktree.path());
+            assert!(p.exists());
+
+            let mut p2 = p.clone();
+            p2.push("README.md");
+            assert!(p2.exists());
+        }
+        // The temporary worktree directory is removed when the Temp variable is dropped.
+        assert!(!p.exists());
+    }
+
+    #[test]
+    fn test_create_orphan_branch() {
+        let rnd: u128 = rand::random();
+        let mut branch = std::string::String::from("entomologist-test-branch-");
+        branch.push_str(&format!("{:0x}", rnd));
+        create_orphan_branch(&branch).unwrap();
+        git_remove_branch(&branch).unwrap();
+    }
+
+    #[test]
+    fn test_branch_exists_0() {
+        let r = git_branch_exists("main").unwrap();
+        assert_eq!(r, true);
+    }
+
+    #[test]
+    fn test_branch_exists_1() {
+        let rnd: u128 = rand::random();
+        let mut branch = std::string::String::from("entomologist-missing-branch-");
+        branch.push_str(&format!("{:0x}", rnd));
+        let r = git_branch_exists(&branch).unwrap();
+        assert_eq!(r, false);
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 713acd1..cca1c90 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,3 @@
+pub mod git;
 pub mod issue;
 pub mod issues;