diff --git a/.changeset/fix-tty.md b/.changeset/fix-tty.md
new file mode 100644
index 0000000..2a77229
--- /dev/null
+++ b/.changeset/fix-tty.md
@@ -0,0 +1,5 @@
+---
+"@spawn-dock/cli": patch
+---
+
+fix: force TTY allocation (-tt) during SSH so opencode is fully interactive without tmux
diff --git a/packages/app/src/docker-git/spawn.ts b/packages/app/src/docker-git/spawn.ts
index 16f5ef4..324389b 100644
--- a/packages/app/src/docker-git/spawn.ts
+++ b/packages/app/src/docker-git/spawn.ts
@@ -132,15 +132,18 @@ const spawnAttachDirect = (
         {
           cwd: process.cwd(),
           command: "ssh",
-          args: buildSshArgs(
-            template,
-            sshKey,
-            ipAddress,
-            `cd '${projectDir}' && spawn-dock agent`
-          ).filter((arg) =>
-            arg !== "-T" && arg !== "-o" && arg !== "BatchMode=yes" && arg !== "ConnectTimeout=2" &&
-            arg !== "ConnectionAttempts=1"
-          )
+          args: [
+            "-tt", // Force TTY allocation for interactive opencode session
+            ...buildSshArgs(
+              template,
+              sshKey,
+              ipAddress,
+              `cd '${projectDir}' && spawn-dock agent`
+            ).filter((arg) =>
+              arg !== "-T" && arg !== "-o" && arg !== "BatchMode=yes" && arg !== "ConnectTimeout=2" &&
+              arg !== "ConnectionAttempts=1"
+            )
+          ]
         },
         [0, 255], // SSH frequently exits with 255 on user disconnect, which is normal
         (exitCode) => new CommandFailedError({ command: "ssh agent", exitCode })