What You Need Before You Start

You need a Arcade developer account, an API key, and an agent or LLM application that supports function calling. Basic familiarity with REST APIs and JSON is enough. Decide which external systems you want your agent to reach, such as email, calendars, or internal databases, because that list defines the tools you will register.

Step 1: Create a Project and Get Credentials

Sign in to Arcade and create a project for your agent. Generate an API key and store it in your environment. Keeping credentials out of your source code is essential, especially because agent tools can act on behalf of your users. Note the tool definitions endpoint, since you will use it to discover and invoke tools.

Step 2: Register Your Tools

Define the tools your agent may use by giving each one a name, a description, and a typed input schema. The description is what the model reads when deciding whether to call the tool, so write it as clearly as you would write documentation for a new teammate. Arcade provides a growing library of prebuilt tools so you rarely start from scratch.

Step 3: Connect Authentication

Connect each tool to the account it should act on. Arcade handles the OAuth dance so your agent can access a user mailbox or calendar without you storing raw passwords. Map each end user to the correct authorized account so that tools always act within the right permissions. This is the layer that makes agent actions safe and auditable.

Step 4: Wire Tools into Your Agent

Point your LLM application at Arcade and pass the available tools as callable functions. When the model chooses a tool, your app forwards the call to Arcade, which executes it against the authorized service and returns a structured result. Handle errors gracefully, because external services fail, and always validate the arguments the model proposes before executing a sensitive action.

Step 5: Test and Add Guardrails

Test with realistic prompts and confirm the agent selects the right tools. Add guardrails such as requiring confirmation for destructive operations, rate limiting per user, and logging every tool call. Arcade gives you a central place to see what agents are doing, which is far easier to audit than scattered integration code.

Step 6: Deploy and Monitor

Ship your integration behind a stable API and monitor tool usage, latency, and error rates. Watch for agents that loop or call tools excessively, and tune descriptions or schemas to correct behavior. As you add capabilities, register new tools rather than hard coding new branches, and your agent will scale more cleanly over time.

Conclusion

Arcade gives agents the ability to do real work without you rebuilding authentication and integration plumbing for every service. Create a project, register well-described tools, connect authentication, wire the tools into your agent, add guardrails, and monitor usage. That path turns a chat assistant into a useful, secure digital worker.

Tool page: Arcade