🔧 Building TaskBuddy — My Mastra A2A Agent for Task Management

🔧 Building TaskBuddy — My Mastra A2A Agent for Task Management

By Harbeahorlar Berry • nov 2025 •

Introduction

In today’s world of workflow automation and intelligent assistants, agents that can communicate and work together — AKA Agent-to-Agent (A2A) — are the next frontier. I built TaskBuddy, a task-management agent using Mastra, and deployed it with a public A2A endpoint. This post shows how I integrated Mastra’s A2A protocol, created tools for tasks, and exposed a JSON-RPC endpoint ready for Telex-style workflows.

What Is Mastra A2A?

Mastra’s A2A implementation standardizes how agents interact:

Uses JSON-RPC 2.0 format

Agents expose endpoints (e.g., /a2a/agent/:agentId)

Supports messages, tool results, artifacts and history

Architecture Overview
[ External Agent or App ] → POST /a2a/agent/taskBuddy

↑

Mastra Agent

↑

Tools: create-task | list-tasks

Key components:

Mastra agent: TaskBuddy

Tools: Create Task & List Tasks

Endpoint: https://abundant-rhythmic-fall-f46cbeb7-10e3-48d6-a489-c34c7301e91b.mastra.cloud/a2a/agent/taskBuddy

Core Tools
✅ create-task

Creates a new task:
Input: { title: string, due?: string }
Output: { message: string, taskId: string }

✅ list-tasks

Lists all tasks:
Output: { tasks: [...], message: string }

Demo — Try It Now
1️⃣ Create a task

POST to /a2a/agent/taskBuddy

{
"jsonrpc": "2.0",
"id": "req-1",
"method": "generate",
"params": {
"message": {
"role": "user",
"parts": [
{ "kind": "text", "text": "Add task: Write blog post due Monday" }
]
}
}
}

2️⃣ List tasks

Same endpoint with message: “Show my tasks” → returns tasks array and message.

Implementation Notes

Built with Node.js + Mastra

Uses Google Gemini (“gemini-2.0-flash”) as backend

Schema validation via Zod

Stores tasks in memory (easily extended to DB)

Follows clean JSON-RPC A2A spec

GitHub & Endpoint

➡ GitHub repo: https://github.com/HarbeahorlarBerry/Abiola_Olatunji_stage3

➡ A2A Agent URL: https://abundant-rhythmic-fall-f46cbeb7-10e3-48d6-a489-c34c7301e91b.mastra.cloud/a2a/agent/taskBuddy

What’s Next

Persist tasks to database

Add delete/update tools

Chain multiple agents together for workflows

Build UI for agent monitoring

Conclusion

TaskBuddy is a simple but powerful demonstration of multi-agent workflows: tools, A2A endpoint, cloud-deployed, ready to integrate. If you’re building intelligent workflows or agent orchestration, this pattern is a strong foundation. Let’s build the future of interoperable AI together.