2 files changed, 29 insertions, 4 deletions
diff --git a/makima/src/daemon/task/manager.rs b/makima/src/daemon/task/manager.rs
index 1e05978..dd133a2 100644
--- a/makima/src/daemon/task/manager.rs
+++ b/makima/src/daemon/task/manager.rs
@@ -2021,7 +2021,7 @@ impl TaskManager {
                 tracing::info!(
                     task_id = %task_id,
                     title = %title,
-                    base_branch = %base_branch,
+                    base_branch = ?base_branch,
                     branch = %branch,
                     "Creating pull request"
                 );
@@ -3136,7 +3136,7 @@ impl TaskManager {
         task_id: Uuid,
         title: String,
         body: Option<String>,
-        base_branch: String,
+        base_branch: Option<String>,
         branch: String,
     ) -> Result<(), DaemonError> {
         // Get worktree path - this works even for completed tasks by scanning worktrees directory
@@ -3156,6 +3156,31 @@ impl TaskManager {
             }
         };
 
+        // Detect base branch if not provided
+        let base_branch = match base_branch {
+            Some(b) => b,
+            None => {
+                match self.worktree_manager.detect_default_branch(&worktree_path).await {
+                    Ok(detected) => {
+                        tracing::info!(task_id = %task_id, detected_branch = %detected, "Auto-detected base branch");
+                        detected
+                    }
+                    Err(e) => {
+                        tracing::error!(task_id = %task_id, error = %e, "Failed to detect default branch");
+                        let msg = DaemonMessage::PRCreated {
+                            task_id,
+                            success: false,
+                            message: format!("Failed to detect default branch: {}", e),
+                            pr_url: None,
+                            pr_number: None,
+                        };
+                        let _ = self.ws_tx.send(msg).await;
+                        return Ok(());
+                    }
+                }
+            }
+        };
+
         tracing::info!(
             task_id = %task_id,
             base_branch = %base_branch,
diff --git a/makima/src/daemon/ws/protocol.rs b/makima/src/daemon/ws/protocol.rs
index e971798..c396961 100644
--- a/makima/src/daemon/ws/protocol.rs
+++ b/makima/src/daemon/ws/protocol.rs
@@ -693,9 +693,9 @@ pub enum DaemonCommand {
         task_id: Uuid,
         title: String,
         body: Option<String>,
-        /// Base branch for the PR.
+        /// Base branch for the PR. If None, will be auto-detected from the repo.
         #[serde(rename = "baseBranch")]
-        base_branch: String,
+        base_branch: Option<String>,
         /// Source branch name to push and create PR from.
         branch: String,
     },