diff --git a/adapters/ai/copilot.sh b/adapters/ai/copilot.sh
new file mode 100644
index 0000000..16608af
--- /dev/null
+++ b/adapters/ai/copilot.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# GitHub Copilot CLI adapter
+
+# Check if GitHub Copilot CLI is available
+ai_can_start() {
+  command -v copilot >/dev/null 2>&1
+}
+
+# Start GitHub Copilot CLI in a directory
+# Usage: ai_start path [args...]
+ai_start() {
+  local path="$1"
+  shift
+
+  if ! ai_can_start; then
+    log_error "GitHub Copilot CLI not found."
+    log_info "Install with: npm install -g @github/copilot"
+    log_info "Or: brew install copilot-cli"
+    log_info "See https://github.com/github/copilot-cli for more information"
+    return 1
+  fi
+
+  if [ ! -d "$path" ]; then
+    log_error "Directory not found: $path"
+    return 1
+  fi
+
+  # Change to the directory and run copilot with any additional arguments
+  (cd "$path" && copilot "$@")
+}
diff --git a/bin/gtr b/bin/gtr
index ea28d08..a997da3 100755
--- a/bin/gtr
+++ b/bin/gtr
@@ -1119,7 +1119,7 @@ load_ai_adapter() {
 
   if ! command -v "$cmd_name" >/dev/null 2>&1; then
     log_error "AI tool '$ai_tool' not found"
-    log_info "Built-in adapters: aider, claude, codex, continue, cursor, gemini, opencode"
+    log_info "Built-in adapters: aider, claude, codex, continue, copilot, cursor, gemini, opencode"
     log_info "Or use any AI tool command available in your PATH (e.g., bunx, gpt)"
     exit 1
   fi
@@ -1293,7 +1293,7 @@ CONFIGURATION OPTIONS:
                            atom, none
   gtr.ai.default           Default AI tool
                            Options: aider, claude, codex, continue,
-                           cursor, gemini, opencode, none
+                           copilot, cursor, gemini, opencode, none
   gtr.copy.include         Files to copy (multi-valued)
   gtr.copy.exclude         Files to exclude (multi-valued)
   gtr.copy.includeDirs     Directories to copy (multi-valued)
diff --git a/completions/_git-gtr b/completions/_git-gtr
index 73df9f9..d56a35a 100644
--- a/completions/_git-gtr
+++ b/completions/_git-gtr
@@ -86,7 +86,7 @@ _git-gtr() {
         _arguments '--editor[Editor to use]:editor:(cursor vscode zed idea pycharm webstorm vim nvim emacs sublime nano atom none)'
         ;;
       ai)
-        _arguments '--ai[AI tool to use]:tool:(aider claude codex continue cursor gemini opencode none)'
+        _arguments '--ai[AI tool to use]:tool:(aider claude codex continue copilot cursor gemini opencode none)'
         ;;
       rm)
         _arguments \