A privacy-centric personal agent that manages your calendar, tasks, and productivity through MCP tools — and coordinates with other agents via A2A protocol.
Coordinating with Sarah's agent. Common availability found: 2:00 PM – 5:00 PM. Awaiting Sarah's approval before confirming.
Proposed Slots
I've proposed these available time slots to @Sarah. Waiting for their selection...
Meeting Approval Request
@Sarah selected a meeting slot.
Approve or reject this meeting time.
Meeting Confirmed
Participants:
- @Tanmay Zade
- @Sarah
The Architecture
One Agent. Two Protocols. Infinite Capability.
CoAgent4U gives you a personal AI agent that accesses your tools via MCP and collaborates with other agents via A2A — all with you in control.
MCP — Tool Access Layer
32 tools across 3 MCP servers — Calendar (17), Tasks (8), and Productivity (7). Your agent accesses Google Calendar & Tasks through the standard Model Context Protocol.
A2A — Agent Collaboration
Agents negotiate scheduling across users using the Agent-to-Agent protocol. Your agent talks to others' agents to find common availability and coordinate meetings.
Privacy-First Design
Human-in-the-loop approvals for every action. Your agent proposes, you decide. Data stays yours — encrypted at rest, with PII detection and data minimization.
32 MCP Tools
Your agent, your tools, your rules
Your personal agent connects to 3 MCP servers with 32 tools for calendar, tasks, and productivity — all accessible through natural language.
Calendar via MCP
17 MCP tools for Google Calendar — list events, check availability, create/delete events, find free slots, all through the standard MCP protocol.
Tasks via MCP
8 MCP tools for Google Tasks — create task lists, add/update/complete/delete tasks. Your agent manages your to-do list through natural language.
LLM-Driven Planning
Groq-powered LLM planner decides which MCP tools to call based on your message. It plans multi-step tasks and summarizes results in natural language.
A2A Coordination
Your agent communicates with other users' agents via the Agent-to-Agent protocol to find common availability and schedule meetings across calendars.
Productivity Intelligence
7 MCP productivity tools — daily briefings, weekly summaries, focus time blocks, smart scheduling with preferences, and recurring routines.
Conflict Detection
Automatic conflict detection across all your commitments before creating events. Your agent checks availability and prevents double-bookings.
MCP + A2A Architecture
How MCP tools and A2A coordination work together
Your personal agent uses MCP to access your tools and A2A to collaborate with other agents — all orchestrated by an LLM planner.
User Message → LLM Planner → MCP Tool Calls → A2A Negotiation → Human Approval → Execution
User Message
User sends a natural language request via Slack or direct HTTP (e.g. "schedule a meeting with Sarah").
LLM Plans Tool Calls
Groq LLM receives 32 MCP tool schemas and decides which tools to call based on user intent.
MCP Tool Execution
Agent executes planned tools via MCP clients — reading calendar, checking availability, creating events.
Invitee Selection
Invitee's agent presents available slots via Slack. The invitee selects a preferred time.
A2A Slot Proposal
Agent A sends proposed slots to Agent B via A2A protocol. Both agents' availability is compared.
A2A Initiation
Agent initiates A2A session with invitee's agent to negotiate meeting times across both calendars.
Human Approval
Requester reviews the selected slot and explicitly approves or rejects the meeting via Slack.
MCP Calendar Create
Agent calls MCP calendar tools to create the event on both Google Calendars via OAuth.
Confirmed & Synced
Meeting confirmed. Both agents sync calendars via MCP. LLM summarizes outcome to both users.
Real Use Case Examples
See it in action
Simple commands, powerful coordination. Walk through complete flows to see how agents work.
show my schedule
Your upcoming schedule (next 7 days):
- • Team StandupMon, Mar 20, 09:00 am – 09:30 am
- • Design ReviewMon, Mar 20, 10:30 am – 11:30 am
- • Lunch with AlexMon, Mar 20, 01:00 pm – 02:00 pm
- • Sprint PlanningMon, Mar 20, 03:00 pm – 05:00 pm
- • Team LunchTue, Mar 21, 12:00 pm – 01:00 pm
Why MCP + A2A
Built on open protocols, not proprietary locks
CoAgent4U combines MCP for tool access and A2A for agent collaboration — giving you extensibility without vendor lock-in.
MCP-Based Extensibility
Adding a new tool is just adding another MCP server. No agent code changes. Calendar, Tasks, Drive, Gmail — any resource becomes an MCP tool.
Agent-to-Agent Collaboration
Your agent talks to others' agents via A2A. Cross-user scheduling happens automatically without manual back-and-forth communication.
LLM-Orchestrated Planning
The Groq-powered LLM planner sees all 32 MCP tool schemas and decides the optimal execution plan for each user message.
Hybrid Architecture
Java Spring Boot backend for A2A coordination + Python FastAPI agent for MCP tools and LLM planning. Best of both worlds.
Human-in-the-Loop Control
Every coordination action requires your explicit approval via Slack. Your agent proposes, you decide. Nothing happens without consent.
Agent Security Status
All systems secure
LLM Model: Groq Llama 3.3 70B · Agent Runtime: FastAPI + FastMCP
Security & Trust
Privacy-centric by design
Your personal agent handles sensitive data — calendar events, task lists, meeting details. Every layer is built with security first.
OAuth2 per Agent
Each agent's Google access is scoped via OAuth2. Tokens stored encrypted in PostgreSQL via the Java bridge, never in files.
MCP Tool Isolation
MCP servers run in-process with separate tool clients. Each tool call is scoped to the authenticated agent — no cross-agent data leaks.
AES-256 Encryption
All agent memory and OAuth tokens encrypted at rest using AES-256. Conversation context is encrypted before writing to the database.
Full Activity Logging
Every tool call, A2A interaction, and LLM plan is logged via the Java bridge. Full transparency into what your agent does and when.
Get Started Today
Your Personal Agent, Powered by MCP & A2A
Stop managing calendars manually. Let your personal agent access tools via MCP, coordinate with others via A2A, and keep you in control.