A chat-based calendar assistant using the Flutter AI Toolkit and the Dartantic AI agentic framework. Talk with your Google Calendar to check your schedule, create events, and manage your time, with a choice of Gemini or OpenAI LLMs.

The screenshot above shows CalPal in action. The user asks for their schedule, and the AI assistant, powered by dartantic_ai, performs a multi-step tool-calling sequence

• it calls the get-current-date-time tool to understand the context of "today".
• it uses that date to call the google_calendar_find_event tool to fetch the schedule.

CalPal does this in a single request-response because Dartantic supports multi-turn tool calling aka "Agent Mode". The right-hand pane shows the tools the agent is working with and the messages passing through the agent during the process.

The second prompt is just for fun. I uploaded a screenshot of the schedule for my local pool and asked it to add a particular swimming session to my calendar. Which it did. And now I'm late for it as I write this. : )

The calendar manipulation functionality comes from the MCP server that Zapier let me create and attach to my Google Calendar. There is almost no calendar-specific functionality in this app (just a little bit in the system prompt). There is zero Zapier-specific functionality -- it's all about what MCP servers you configure and tools you pass in.

Before running this sample, you'll need to set up a MCP CLI Proxy MCP Server on Zapier.

You'll want the transport to be set to Streamable HTTP and grab the Server URL.

Set that URL to the ZAPIER_MCP_URL environment variable and make sure it's available in your app's environment.

Also you'll need GEMINI_API_KEY and/or OPENAI_API_KEY your environment, depending on whether you want to use the Gemini or OpenAI models.

Or you don't need anything in your environment. You can pass these values in manually via the McpClient and Agent classes if you'd rather. Environmental variables by convention are great for server-side uses, so I just built them in but they're not required.

And of course, the web doesn't support an environment and my plan is to target Flutter Web with Dartantic. Unfortunately that support is not there yet, since Dartantic depends on the mcp_dart package, which doesn't support the web yet, but web support is coming!

Huge shout-out to Jhin Lee and David Miguel Lozano who both turned around non-trivial changes very quickly so I could pull this sample together. Check out their stuff! They both do amazing work.