diff --git a/Sources/ClaudeCodeCore/Services/TerminalLauncher.swift b/Sources/ClaudeCodeCore/Services/TerminalLauncher.swift
index 010a3f5..cb7aec5 100644
--- a/Sources/ClaudeCodeCore/Services/TerminalLauncher.swift
+++ b/Sources/ClaudeCodeCore/Services/TerminalLauncher.swift
@@ -90,7 +90,8 @@ public struct TerminalLauncher {
       )
     }
   }
-  
+
+
   /// Finds the full path to the Claude executable
   /// - Parameters:
   ///   - command: The command name to search for (e.g., "claude")
@@ -152,4 +153,223 @@ public struct TerminalLauncher {
     
     return nil
   }
+
+  /// NEW: Launches Doctor by executing reproduction command (headless), capturing session, then resuming in Terminal
+  /// - Parameters:
+  ///   - reproductionCommand: The full command from terminalReproductionCommand
+  ///   - debugReport: The full debug report to send as context
+  ///   - systemPrompt: The doctor system prompt (instructions only)
+  /// - Returns: An error if launching fails, nil on success
+  public static func launchDoctorByExecutingCommand(
+    reproductionCommand: String,
+    debugReport: String,
+    systemPrompt: String
+  ) async -> Error? {
+    // Resolve the claude executable path and extract working directory
+    let (preparedCommand, workingDir, resolveError) = prepareCommandWithResolvedClaudePath(reproductionCommand)
+    if let err = resolveError {
+      return err
+    }
+
+    // Launch Terminal with a script that executes command, captures output, and auto-resumes with context
+    // This runs everything in Terminal (has TTY) - no headless execution needed
+    return launchTerminalWithCaptureAndResume(
+      command: preparedCommand,
+      workingDir: workingDir,
+      originalCommand: reproductionCommand,
+      debugReport: debugReport,
+      systemPrompt: systemPrompt
+    )
+  }
+
+  // MARK: - Private helpers for Doctor flow
+
+  /// Launches Terminal with a script that runs command, captures output, and auto-resumes with context
+  private static func launchTerminalWithCaptureAndResume(
+    command: String,
+    workingDir: String?,
+    originalCommand: String,
+    debugReport: String,
+    systemPrompt: String
+  ) -> Error? {
+    // Extract claude executable path from prepared command for use in resume
+    // The command may be like: echo "..." | "/path/to/claude" args...
+    let claudePath: String
+    if let match = command.range(of: #"\"([^\"]+/claude[^\"]*)\"|\s(/[^\s]+/claude)"#, options: .regularExpression) {
+      let matched = String(command[match])
+      claudePath = matched.replacingOccurrences(of: "\"", with: "").trimmingCharacters(in: .whitespaces)
+    } else {
+      // Fallback to finding claude executable
+      claudePath = findClaudeExecutable(command: "claude", additionalPaths: nil) ?? "claude"
+    }
+
+    // Write files to avoid quoting hell
+    let tempDir = NSTemporaryDirectory()
+    let promptPath = (tempDir as NSString).appendingPathComponent("doctor_prompt_\(UUID().uuidString).txt")
+    let originalCmdPath = (tempDir as NSString).appendingPathComponent("doctor_original_cmd_\(UUID().uuidString).txt")
+    let debugReportPath = (tempDir as NSString).appendingPathComponent("doctor_debug_report_\(UUID().uuidString).txt")
+
+    do {
+      try systemPrompt.write(toFile: promptPath, atomically: true, encoding: .utf8)
+      try originalCommand.write(toFile: originalCmdPath, atomically: true, encoding: .utf8)
+      try debugReport.write(toFile: debugReportPath, atomically: true, encoding: .utf8)
+    } catch {
+      return NSError(domain: "TerminalLauncher", code: 3, userInfo: [NSLocalizedDescriptionKey: "Failed to write temp files: \(error.localizedDescription)"])
+    }
+
+    // Escape paths for shell
+    let escapedPromptPath = promptPath.replacingOccurrences(of: "'", with: "'\\''")
+    let escapedOriginalCmdPath = originalCmdPath.replacingOccurrences(of: "'", with: "'\\''")
+    let escapedDebugReportPath = debugReportPath.replacingOccurrences(of: "'", with: "'\\''")
+    let escapedClaudePath = claudePath.replacingOccurrences(of: "'", with: "'\\''")
+
+    // Build cd prefix if needed
+    let cdPrefix: String
+    if let dir = workingDir, !dir.isEmpty {
+      let escapedDir = dir.replacingOccurrences(of: "'", with: "'\\''")
+      cdPrefix = "cd '\(escapedDir)'\n"
+    } else {
+      cdPrefix = ""
+    }
+
+    // Create Terminal script that captures command output and auto-resumes
+    let scriptPath = (tempDir as NSString).appendingPathComponent("doctor_\(UUID().uuidString).command")
+    let scriptContent = """
+    #!/bin/bash -l
+
+    echo "═══════════════════════════════════════"
+    echo "ClaudeCodeUI Doctor - Executing Command"
+    echo "═══════════════════════════════════════"
+    echo ""
+
+    \(cdPrefix)
+    # Execute reproduction command and capture all output
+    echo "Running: $(cat '\(escapedOriginalCmdPath)')"
+    echo ""
+    OUTPUT=$(\(command) 2>&1)
+    EXIT_CODE=$?
+
+    echo ""
+    echo "═══════════════════════════════════════"
+    echo "Command Completed (exit code: $EXIT_CODE)"
+    echo "═══════════════════════════════════════"
+    echo ""
+
+    # Extract session ID from output (first line should be JSON with session_id)
+    SESSION_ID=$(echo "$OUTPUT" | head -20 | grep -o '"session_id":"[^"]*"' | head -1 | cut -d'"' -f4)
+
+    if [ -z "$SESSION_ID" ]; then
+      echo "❌ ERROR: Could not extract session_id from command output"
+      echo ""
+      echo "Output preview:"
+      echo "$OUTPUT" | head -20
+      echo ""
+      echo "Press Enter to close..."
+      read
+      exit 1
+    fi
+
+    echo "✅ Captured session: $SESSION_ID"
+    echo ""
+    echo "═══════════════════════════════════════"
+    echo "Launching Doctor Session..."
+    echo "═══════════════════════════════════════"
+    echo ""
+
+    # Build context message with debug report + command output
+    CONTEXT_MSG="Debug Report:"$'\n'"$(cat '\(escapedDebugReportPath)')"$'\n\nCommand Output:\n'"$OUTPUT"
+
+    # Resume session with context as first message
+    '\(escapedClaudePath)' -r "$SESSION_ID" -p "$CONTEXT_MSG" --append-system-prompt "$(cat '\(escapedPromptPath)')" --permission-mode plan
+
+    # Cleanup
+    rm -f '\(escapedPromptPath)' '\(escapedOriginalCmdPath)' '\(escapedDebugReportPath)'
+    """
+
+    do {
+      try scriptContent.write(toFile: scriptPath, atomically: true, encoding: .utf8)
+      let attributes = [FileAttributeKey.posixPermissions: 0o755]
+      try FileManager.default.setAttributes(attributes, ofItemAtPath: scriptPath)
+
+      let url = URL(fileURLWithPath: scriptPath)
+      NSWorkspace.shared.open(url)
+
+      // Cleanup script after delay
+      DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
+        try? FileManager.default.removeItem(atPath: scriptPath)
+      }
+
+      return nil
+    } catch {
+      return NSError(domain: "TerminalLauncher", code: 2, userInfo: [NSLocalizedDescriptionKey: "Failed to launch Terminal: \(error.localizedDescription)"])
+    }
+  }
+
+  /// Returns a tuple of (preparedCommand, workingDir, error)
+  /// Replaces the first occurrence of the claude command with its resolved absolute path,
+  /// preserving all quoting and piping. Also extracts the working directory from an initial `cd` if present.
+  private static func prepareCommandWithResolvedClaudePath(_ reproductionCommand: String) -> (String, String?, Error?) {
+    // Extract working directory if the command starts with: cd "..." && ...
+    var workingDir: String?
+    var remaining = reproductionCommand
+
+    if reproductionCommand.hasPrefix("cd ") {
+      // Expect format: cd "<path>" && <rest>
+      // Find the first '&&' separator safely
+      if let rangeOfAnd = reproductionCommand.range(of: " && ") {
+        let cdPart = String(reproductionCommand[..<rangeOfAnd.lowerBound])
+        remaining = String(reproductionCommand[rangeOfAnd.upperBound...])
+
+        // cdPart should be: cd "<path>"
+        if let firstQuote = cdPart.firstIndex(of: "\"") {
+          let afterFirst = cdPart.index(after: firstQuote)
+          if let secondQuote = cdPart[afterFirst...].firstIndex(of: "\"") {
+            workingDir = String(cdPart[afterFirst..<secondQuote])
+          }
+        }
+      }
+    }
+
+    // At this point, `remaining` is either the original command or the part after the leading cd &&
+    // If the command is of the form: echo "..." | <cmd> ..., we must preserve the echo prefix for execution,
+    // but identify the CLI token from the part after the pipe.
+    var leadingPrefix = ""
+    var commandPortion = remaining
+    if commandPortion.hasPrefix("echo ") {
+      if let pipeRange = commandPortion.range(of: " | ") {
+        leadingPrefix = String(commandPortion[..<pipeRange.upperBound]) // includes the trailing pipe+space
+        commandPortion = String(commandPortion[pipeRange.upperBound...])
+      }
+    }
+
+    // Identify the command token (first whitespace-delimited token)
+    let trimmed = commandPortion.trimmingCharacters(in: .whitespacesAndNewlines)
+    guard let endOfCmd = trimmed.firstIndex(where: { $0.isWhitespace }) ?? trimmed.endIndex as String.Index?, !trimmed.isEmpty else {
+      return (reproductionCommand, workingDir, NSError(domain: "TerminalLauncher", code: 3, userInfo: [NSLocalizedDescriptionKey: "Unable to parse command token from reproduction command"]))
+    }
+    let cmdToken = String(trimmed[..<endOfCmd])
+
+    // Resolve the executable path
+    guard let resolvedPath = findClaudeExecutable(command: cmdToken, additionalPaths: nil) else {
+      return (reproductionCommand, workingDir, NSError(domain: "TerminalLauncher", code: 1, userInfo: [NSLocalizedDescriptionKey: "Could not find '\(cmdToken)' command. Please ensure Claude Code CLI is installed or configure its path in preferences. "]))
+    }
+
+    // Replace only the first occurrence of cmdToken in the commandPortion
+    guard let tokenRangeInPortion = commandPortion.range(of: cmdToken) else {
+      return (reproductionCommand, workingDir, NSError(domain: "TerminalLauncher", code: 3, userInfo: [NSLocalizedDescriptionKey: "Failed to locate command token in reproduction command"]))
+    }
+    var replacedPortion = commandPortion
+    replacedPortion.replaceSubrange(tokenRangeInPortion, with: "\"\(resolvedPath)\"")
+
+    // Rebuild the full command with any leading parts preserved
+    let prepared: String
+    if reproductionCommand.hasPrefix("cd "), let rangeOfAnd = reproductionCommand.range(of: " && ") {
+      let prefix = String(reproductionCommand[..<rangeOfAnd.lowerBound])
+      prepared = prefix + " && " + leadingPrefix + replacedPortion
+    } else {
+      prepared = leadingPrefix + replacedPortion
+    }
+
+    return (prepared, workingDir, nil)
+  }
 }
diff --git a/Sources/ClaudeCodeCore/UI/GlobalSettingsView.swift b/Sources/ClaudeCodeCore/UI/GlobalSettingsView.swift
index 7bcbbda..1451bf7 100644
--- a/Sources/ClaudeCodeCore/UI/GlobalSettingsView.swift
+++ b/Sources/ClaudeCodeCore/UI/GlobalSettingsView.swift
@@ -392,8 +392,22 @@ struct GlobalSettingsView: View {
                 .stroke(hasCommandInfo ? Color.secondary.opacity(0.2) : Color.secondary.opacity(0.15), lineWidth: 1)
             )
 
-            HStack {
+            HStack(spacing: 8) {
               Spacer()
+
+              Button(action: {
+                runDoctor()
+              }) {
+                HStack(spacing: 4) {
+                  Image(systemName: "stethoscope")
+                  Text("Run Doctor")
+                }
+              }
+              .buttonStyle(.bordered)
+              .disabled(!hasCommandInfo)
+              .help(hasCommandInfo ? "Launch debugging session in Terminal" : "Send a message first to generate debug info")
+              .padding(.top, 8)
+
               Button(action: {
                 copyFullReportToClipboard()
               }) {
@@ -762,6 +776,44 @@ struct GlobalSettingsView: View {
       reportCopied = false
     }
   }
+
+  private func runDoctor() {
+    guard let viewModel = chatViewModel,
+          let report = viewModel.fullDebugReport,
+          let reproCommand = viewModel.terminalReproductionCommand else { return }
+
+    // Create doctor system prompt (instructions only, no data)
+    let doctorPrompt = """
+    You are a ClaudeCodeUI Debug Doctor.
+
+    Your task:
+    1. Review the debug report and command execution output in the first message
+    2. Compare the command output with what's expected in the debug report
+    3. Look for discrepancies (PATH differences, executable location, errors, etc.)
+    4. If you find issues, create a plan to fix them in priority order
+    5. If everything works fine, explain that the app is working correctly
+
+    Work in plan mode - propose fixes before executing them.
+    """
+
+    // Launch Terminal with doctor session
+    Task {
+      if let error = await TerminalLauncher.launchDoctorByExecutingCommand(
+        reproductionCommand: reproCommand,
+        debugReport: report,
+        systemPrompt: doctorPrompt
+      ) {
+        await MainActor.run {
+          let alert = NSAlert()
+          alert.messageText = "Failed to Launch Doctor"
+          alert.informativeText = error.localizedDescription
+          alert.alertStyle = .warning
+          alert.addButton(withTitle: "OK")
+          alert.runModal()
+        }
+      }
+    }
+  }
 }