diff --git a/startup.sh b/startup.sh
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+++ b/startup.sh
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+#!/bin/zsh
+
+# Scribby Developer Startup Script
+# Based on Option 3: Local Development Setup from README.md
+
+echo "Starting Scribby developer environments..."
+
+# Function to start backend
+start_backend() {
+    echo "Setting up backend..."
+    cd backend
+    uv venv --python 3.13
+    source .venv/bin/activate
+    uv pip install -r requirements.txt
+    echo "Starting backend on port 8000..."
+    python -m uvicorn api:app --host 0.0.0.0 --port 8000 &
+    BACKEND_PID=$!
+    cd ..
+}
+
+# Function to start backend-agent
+start_agent() {
+    echo "Setting up backend-agent..."
+    cd backend-agent
+    uv venv --python 3.13
+    source .venv/bin/activate
+    uv pip install -r requirements.txt
+    echo "Starting backend-agent on port 8001..."
+    python -m uvicorn agent:app --host 0.0.0.0 --port 8001 &
+    AGENT_PID=$!
+    cd ..
+}
+
+# Function to start frontend
+start_frontend() {
+    echo "Setting up agent-frontend..."
+    cd agent-frontend
+    npm install
+    echo "Starting frontend on port 3000..."
+    npm start &
+    FRONTEND_PID=$!
+    cd ..
+}
+
+# Start all services
+start_backend
+start_agent
+start_frontend
+
+echo "All services started!"
+echo "Frontend: http://localhost:3000"
+echo "Backend API: http://localhost:8000"
+echo "Agent API: http://localhost:8001"
+echo "Press Ctrl+C to stop all services"
+
+# Wait for all processes
+wait $BACKEND_PID $AGENT_PID $FRONTEND_PID</content>
+<parameter name="filePath">/Users/jocreed/jock-projects/scribby/startup.sh