Cursor Plugin Convex Rule Local Development Agent Mode

Agent Mode (For Cloud Coding Agents)

Agent Mode allows cloud-based coding agents to work with Convex without conflicting with your personal development environment.

What is Agent Mode?

Purpose: Prevents cloud coding agents from conflicting with your development work.

The Problem: When cloud agents (Jules, Devin, Cursor Cloud Agents) run npx convex dev, they would normally use your default dev deployment. This conflicts with your own changes!

The Solution: Agent mode creates an isolated anonymous development environment for the agent.

When to Use Agent Mode

✅ Use Agent Mode For:

• Cloud coding agents (Jules, Devin, Codex)
• Cursor Cloud Agents (remote agents)
• CI/CD environments where login isn't possible
• Any automated tool that can't log in

❌ Don't Need Agent Mode For:

• Local development (Cursor IDE, VS Code)
• Claude Code CLI (local agent)
• Your own terminal (just log in normally)
• Local coding assistants that use your login

Key: If the agent runs locally and you're logged in, it doesn't need agent mode!

Setup

Set the environment variable:

# .env.local
CONVEX_AGENT_MODE=anonymous

Or run directly:

CONVEX_AGENT_MODE=anonymous npx convex dev

How It Works

When a cloud agent runs with CONVEX_AGENT_MODE=anonymous:

1. Agent runs npx convex dev
2. Instead of using your dev deployment, it creates an isolated environment
3. Agent can develop without conflicting with your work
4. Changes are isolated to the agent's session

Example: Cursor Cloud Agent

# .env.local (for cloud agent)
CONVEX_AGENT_MODE=anonymous

# Agent runs this
npx convex dev

# Creates isolated environment, doesn't touch your dev deployment

Not Needed for Local Development

For local development (you at your computer):

# Just log in normally
npx convex dev

# This works fine! Uses your dev deployment.
# Local agents (Cursor, Claude Code) use this.

You don't need agent mode because:

• You're logged in locally
• Local agents use your credentials
• No conflict with yourself

CI/CD with Agent Mode

Perfect for automated environments:

# .github/workflows/test.yml
name: Test

on: [push]

jobs:
  test:
    runs-on: ubuntu-latest
    env:
      CONVEX_AGENT_MODE: anonymous
    steps:
      - uses: actions/checkout@v3
      - run: npm install
      - run: npx convex dev &
      - run: npm test

Beta Feature Notice

⚠️ Agent mode is currently in beta.

Future improvements may include:

• Agents provisioning their own short-lived cloud deployments
• Better isolation mechanisms
• Additional agent modes

Common Misconceptions

❌ "I need agent mode for local development"

No! Just log in normally:

npx convex dev  # This is fine for local work

❌ "Agent mode is for anonymous users in my app"

No! Agent mode is for coding agents, not app users.

For anonymous app users, use proper auth with guest/anonymous support.

❌ "Agent mode lets me skip authentication"

No! Agent mode is about deployment isolation for agents, not skipping auth in your app.

You still need auth in your functions!

Checklist

• Only use agent mode for cloud coding agents
• Set CONVEX_AGENT_MODE=anonymous in agent's environment
• Local development doesn't need agent mode
• CI/CD can use agent mode for isolation
• Still implement proper auth in your functions

Learn More

• Agent Mode Documentation
• Convex Discord - Provide feedback on agent mode
• Authentication Setup