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Google Calendar MCP Server

by harshwadhawe

Project Management MCP Server

A Model Context Protocol (MCP) server that acts as a context-aware middleware for AI assistants. It intercepts user queries, analyzes intent, fetches context from multiple productivity systems (Google Calendar, GitHub, Slack, and JIRA), assembles a structured context package, and delivers it alongside the original prompt to the Gemini AI model for hyper-relevant responses.

This repository (together with a Devpost demo video) forms the submission for the Build-Your-Own-MCP Challenge.


Table of Contents

  1. High-Level Workflow

  2. Key Capabilities

  3. Architecture

  4. Integrations & Required Credentials

  5. Installation & Setup

  6. Running the Server & UI

  7. Available MCP Tools

  8. Submission Checklist

  9. Project Structure

  10. Troubleshooting

  11. License & Contact


High-Level Workflow

  1. Intercept user queries (via MCP client, CLI, or Streamlit dashboard).

  2. Analyze intent with an NLP-powered QueryAnalyzer (intent detection, entity extraction, domain classification, temporal parsing).

  3. Fetch supplemental context from the relevant data sources.

  4. Assemble a ranked & summarized context package using caching, ranking, summarization, and correlation engines.

  5. Deliver the context bundle and original prompt to Gemini for the final response.


Key Capabilities

Intelligent Query Understanding

  • Detects calendar, GitHub, Slack, and JIRA domains (or multi-domain queries).

  • Extracts entities such as repositories, PR/issue counts, calendar dates, backlog keywords, etc.

  • Supports relative and absolute time references via a time-aware analyzer.

Multi-Source Context Gathering

  • Google Calendar: Events, availability, conflicts, and multi-calendar aggregation.

  • GitHub: Repositories, issues, PRs, commits, deployments, README summaries.

  • Slack: Channels, mentions, unread messages, recent activity.

  • JIRA: Boards, assigned issues, backlog items, sprint insights.

Context Packaging

  • ContextCache: TTL-based cache to minimize redundant API calls.

  • ContextRanker: Prioritizes the most relevant events/issues per query.

  • ContextSummarizer: Compresses context to stay within token budgets.

  • ContextCorrelator: Cross-links signals across services (e.g., meetings vs. deployments vs. Slack alerts).

Delivery via Gemini

  • Aggregated context + user prompt → Gemini (primarily gemini-2.5-flash) to craft a tailored response.


Architecture

┌──────────────────────────┐ │ User Request │ └────────────┬─────────────┘ │ ▼ ┌──────────────────────────┐ │ Query Analyzer │ ← intent detection, entities, time range └────────────┬─────────────┘ │ ┌──────────┼───────────┐ │ │ │ ▼ ▼ ▼ Calendar GitHub Slack JIRA Client Client Client Client (fetch) (fetch) (fetch) (fetch) │ │ │ │ └──────────┴───────────┴─────────┘ │ ▼ ┌──────────────────────────┐ │ Cache / Rank / Summarize │ └────────────┬─────────────┘ │ ▼ ┌──────────────────────────┐ │ Gemini Client (Chat) │ → context + prompt → AI answer └──────────────────────────┘

Integrations & Required Credentials

Service

Credentials / Env Vars

Notes

Google Calendar

config/credentials.json

,

config/token.json

(generated)

OAuth desktop credentials with Calendar scopes

GitHub

.env

GITHUB_TOKEN

Personal Access Token with repo scope

Slack

.env

SLACK_USER_TOKEN

User token with

channels:read

,

channels:history

,

groups:*

,

im:*

,

search:read

,

users:read

JIRA

.env

JIRA_BASE_URL

,

JIRA_EMAIL

,

JIRA_API_TOKEN

Jira Cloud site, email, and API token

Gemini

.env

GEMINI_API_KEY

Google AI Studio API key

Optional environment variables (with defaults in code):

  • GOOGLE_CREDENTIALS_PATH (default config/credentials.json)

  • GOOGLE_TOKEN_PATH (default config/token.json)

  • CALENDAR_TIMEZONE (used for time parsing defaults)

Make sure sensitive files (credentials and tokens) stay out of version control. .gitignore already excludes them.


Installation & Setup

  1. Clone the repository

    git clone <repo-url> cd MCP\ server
  2. Create & activate a Python environment

    python3 -m venv .venv source .venv/bin/activate # Windows: .venv\Scripts\activate
  3. Install dependencies

    pip install -r requirements.txt
  4. Provide credentials

    • Place Google OAuth desktop credentials at config/credentials.json.

    • Create a .env file (copy .env.example) and populate the tokens/keys listed above.

  5. Authenticate Google Calendar (first run) Running the server for the first time will launch a browser window for Google OAuth and produce config/token.json.


Running the Server & UI

1. MCP Server (JSON-RPC over stdio)

python main.py

This registers tools such as chat, get_calendar_context, get_github_repositories, get_slack_mentions, get_jira_backlog, etc.

2. Streamlit Dashboard (optional UI)

streamlit run streamlit_app.py

Features predefined queries, quick actions, and a custom prompt box for Calendar/GitHub/Slack/JIRA.

3. CLI Test Scripts (optional)

  • interactive_client.py for command-line chat testing.

  • slack_test.py, jira_test.py for quick credential and API verification.


Available MCP Tools

Tool

Description

chat

Main conversational endpoint; auto-fetches relevant context across all services.

Calendar

get_calendar_context

Analyze a query and return formatted calendar context.

check_availability

Check availability for a specific timeslot.

get_upcoming_events

List upcoming events.

detect_conflicts

Identify conflicts on a date.

GitHub

get_github_repositories

List repositories (with metadata).

get_github_issues

Fetch open issues.

get_github_pull_requests

Fetch PRs.

get_github_deployments

Retrieve deployments + status.

Slack

get_slack_channels

List channels.

get_slack_unread

Channels with unread messages.

get_slack_mentions

Recent mentions.

JIRA

get_jira_boards

List boards.

get_jira_issues

General issue retrieval (board/JQL).

get_my_jira_issues

Issues assigned to the authenticated user (with fallbacks).

get_jira_backlog

Backlog items (Agile API + JQL fallback).

Each tool returns a formatted string suitable for direct inclusion in a context package.


Submission Checklist

GitHub Repository – contains the full MCP server implementation, connectors, UI, and test scripts.

Context-Aware Workflow – intercept → analyze → fetch → assemble → deliver implemented across four services.

⚠️ Devpost Video Demo – still needed. Please record a short walkthrough showing:

  • How a query flows through the system (e.g., via Streamlit UI).

  • The resulting context assembly (logs/UI snippets).

  • The Gemini-powered responses.

  • Any unique 2.0 features (caching, correlation, summarization). Upload the video to Devpost along with the repo link.


Project Structure

MCP server/ ├── main.py # Entry point for MCP server ├── streamlit_app.py # Optional Streamlit UI ├── interactive_client.py # Simple CLI client ├── slack_test.py / jira_test.py# Quick integration smoke tests ├── src/ │ ├── server.py # MCP tools & orchestration layer │ ├── query_analyzer.py # NLP intent/time/entity detection │ ├── context_cache.py # TTL cache for API responses │ ├── context_ranker.py # Relevance scoring │ ├── context_summarizer.py # Compression + summarization utilities │ ├── context_correlator.py # Multi-source correlation engine │ ├── context_formatter.py # Human-friendly context formatting │ ├── gemini_client.py # Gemini chat integration │ ├── calendar_client.py # Google Calendar wrapper │ ├── github_client.py # GitHub REST wrapper │ ├── slack_client.py # Slack WebClient wrapper │ ├── jira_client.py # Jira REST (Agile + Core) wrapper │ └── connectors/ # Connector facades per service ├── config/ │ ├── credentials.json # Google OAuth client (excluded from git) │ └── token.json # Google OAuth token (excluded from git) ├── requirements.txt ├── .env.example └── README.md (this file)

Troubleshooting

Issue

Resolution

Google Calendar auth loop

Delete

config/token.json

and rerun to reauthenticate. Ensure OAuth consent screen has you as a test user.

GitHub 401

Regenerate

GITHUB_TOKEN

(classic PAT) with

repo

scope.

Slack

missing_scope

Add required scopes under

User Token Scopes

and reinstall the app.

JIRA 410 errors

Confirm you have access to the Jira Cloud site and use valid API tokens. The client already falls back to board-based queries when search fails.

Gemini errors

Verify

GEMINI_API_KEY

is correct and the selected model is available in your region/account.

Logging is configured to stderr to avoid interfering with MCP stdio responses.


License & Contact

Created for the Build-Your-Own-MCP Challenge.

For questions, open an issue or reach out via the Devpost discussion board when submitting your demo.

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security - not tested
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license - not found
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quality - not tested

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