diff --git a/Sources/AppDelegate.swift b/Sources/AppDelegate.swift
index 607fdb56..e0cabdaa 100644
--- a/Sources/AppDelegate.swift
+++ b/Sources/AppDelegate.swift
@@ -1176,6 +1176,33 @@ func shouldRouteTerminalFontZoomShortcutToGhostty(
     ) != nil
 }
 
+func shouldRouteTerminalCommandShortcutToGhostty(
+    flags: NSEvent.ModifierFlags,
+    chars: String,
+    keyCode: UInt16,
+    terminalHasSelection: Bool
+) -> Bool {
+    let normalizedFlags = flags
+        .intersection(.deviceIndependentFlagsMask)
+        .subtracting([.numericPad, .function, .capsLock])
+    guard normalizedFlags.contains(.command) else { return false }
+
+    let normalizedChars = chars.lowercased()
+    if normalizedFlags == [.command] {
+        // Keep Preferences (Cmd+,) menu-routed even when a terminal is focused.
+        if normalizedChars == "," || keyCode == 43 {
+            return false
+        }
+
+        // Preserve standard copy behavior when text is selected in the terminal.
+        if (normalizedChars == "c" || keyCode == 8), terminalHasSelection {
+            return false
+        }
+    }
+
+    return true
+}
+
 func cmuxOwningGhosttyView(for responder: NSResponder?) -> GhosttyNSView? {
     guard let responder else { return nil }
     if let ghosttyView = responder as? GhosttyNSView {
@@ -8428,6 +8455,23 @@ private extension NSWindow {
             return true
         }
 
+        // Support custom tmux prefixes (for example Cmd+C): when the terminal is focused
+        // and no app-level shortcut matched, prefer forwarding Command-key input to the
+        // terminal rather than consuming it as a menu key equivalent.
+        if let ghosttyView = firstResponderGhosttyView,
+           shouldRouteTerminalCommandShortcutToGhostty(
+               flags: event.modifierFlags,
+               chars: event.charactersIgnoringModifiers ?? "",
+               keyCode: event.keyCode,
+               terminalHasSelection: ghosttyView.terminalSurface?.hasSelection() ?? false
+           ) {
+            ghosttyView.keyDown(with: event)
+#if DEBUG
+            dlog("  → ghostty command passthrough")
+#endif
+            return true
+        }
+
         // When the terminal is focused, skip the full NSWindow.performKeyEquivalent
         // (which walks the SwiftUI content view hierarchy) and dispatch Command-key
         // events directly to the main menu. This avoids the broken SwiftUI focus path.
diff --git a/cmuxTests/CmuxWebViewKeyEquivalentTests.swift b/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
index 3e0d1c72..dc2ecb6f 100644
--- a/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
+++ b/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
@@ -2228,6 +2228,71 @@ final class BrowserZoomShortcutRoutingPolicyTests: XCTestCase {
     }
 }
 
+final class TerminalCommandShortcutRoutingPolicyTests: XCTestCase {
+    func testRoutesCommandCToTerminalWhenNoSelection() {
+        XCTAssertTrue(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.command],
+                chars: "c",
+                keyCode: 8, // kVK_ANSI_C
+                terminalHasSelection: false
+            )
+        )
+    }
+
+    func testKeepsCommandCCopyMenuRoutedWhenSelectionExists() {
+        XCTAssertFalse(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.command],
+                chars: "c",
+                keyCode: 8, // kVK_ANSI_C
+                terminalHasSelection: true
+            )
+        )
+    }
+
+    func testKeepsCommandCommaMenuRoutedForPreferences() {
+        XCTAssertFalse(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.command],
+                chars: ",",
+                keyCode: 43, // kVK_ANSI_Comma
+                terminalHasSelection: false
+            )
+        )
+    }
+
+    func testRequiresCommandModifier() {
+        XCTAssertFalse(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.control],
+                chars: "c",
+                keyCode: 8,
+                terminalHasSelection: false
+            )
+        )
+    }
+
+    func testRoutesOtherCommandShortcutsToTerminal() {
+        XCTAssertTrue(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.command, .option],
+                chars: "c",
+                keyCode: 8,
+                terminalHasSelection: false
+            )
+        )
+        XCTAssertTrue(
+            shouldRouteTerminalCommandShortcutToGhostty(
+                flags: [.command],
+                chars: "v",
+                keyCode: 9, // kVK_ANSI_V
+                terminalHasSelection: false
+            )
+        )
+    }
+}
+
 final class GhosttyResponderResolutionTests: XCTestCase {
     private final class FocusProbeView: NSView {
         override var acceptsFirstResponder: Bool { true }