What is calendar-mcp copilot-instructions.md?

Project instructions for a C# and .NET server that gives AI assistants one way to use several Microsoft 365, Outlook.com, and Google Workspace email and calendar accounts. They cover the project structure, authentication, security, testing, and development rules.

Developing, configuring, testing, and maintaining the calendar server, including its account providers, routing, authentication, security, and telemetry.

Using multiple email and calendar providers can otherwise require separate integrations and inconsistent rules. These instructions collect the project context and expected safeguards in one place.

How MarimerLLC/calendar-mcp configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to MarimerLLC/calendar-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/MarimerLLC/calendar-mcp/main/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/MarimerLLC/calendar-mcp

Made for: GitHub Copilot.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/marimerllc/calendar-mcp/copilot-instructions/github.svg)](https://agentmods.dev/instructions/marimerllc/calendar-mcp/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/marimerllc/calendar-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/marimerllc/calendar-mcp/copilot-instructions/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/marimerllc/calendar-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/marimerllc/calendar-mcp/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,605 This file is loaded in full into every session.

When invoked 1,605 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01605	$0.01605
Opus 5.5	$0.00642	$0.00642
Sonnet 5.5	$0.00321	$0.00321
Haiku 4.5	$0.00161	$0.00161

Measured 2mo ago against content hash 2a49ecdc8083, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

calendar-mcp copilot-instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/copilot-instructions.md · 156 lines

How it starts

The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Instructions for Calendar-MCP

This repository contains a Model Context Protocol (MCP) server written in C# / .NET 10 that provides unified access to multiple email and calendar accounts across Microsoft 365, Outlook.com, and Google Workspace.

📖 Quick Context

Read these first when starting work:

Project Context & Architecture - High-level overview, problem statement, and architecture
.NET Development Guidelines - .NET best practices and coding standards
Common Code Patterns - Code patterns and examples for MCP tools, providers, and services
Build, Test & Environment Setup - How to build, test, and configure the project
Security Best Practices - Authentication, token management, and security guidelines
Repository Rules - Documentation and change management rules

Detailed documentation: See /docs folder for comprehensive technical specifications on authentication, providers, routing, security, telemetry, and more.

🎯 Project Overview

This MCP server enables AI assistants (Claude, ChatGPT, GitHub Copilot) to access multiple email and calendar accounts simultaneously. It solves the multi-tenant problem where professionals manage multiple Microsoft 365 tenants, Outlook.com, and Google Workspace accounts.

Key Architecture Points:

Provider ≠ Account: One provider service manages multiple accounts with isolated credentials
Per-Account Isolation: Every account has its own authentication context and encrypted token storage
Smart Routing: Configurable AI backend (Ollama local or cloud APIs) for intelligent account selection
Security First: Encrypted tokens, minimal privilege scopes, privacy-first telemetry

🏗️ Project Structure

/src                    # Main source code
  /CalendarMcp.Core     # Core business logic and services
  /CalendarMcp.StdioServer  # MCP stdio server implementation
/docs                   # Comprehensive technical documentation
/spikes                 # Spike/experimental projects
/.github/instructions   # Detailed Copilot instructions
/changelogs            # Change logs and summaries (use for documenting changes)

Read the full file on GitHub · 156 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 156 lines · 1,605 tokens per session scan A 2a49ecdc8083

Subscribe to this mod's changes

calendar-mcp copilot-instructions.md is an instructions file published in the GitHub repository MarimerLLC/calendar-mcp (25 stars, last pushed 16d ago), licensed MIT. It adds 1,605 tokens to every session, about $0.0064 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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calendar-mcp copilot-instructions.md next to 6 instructions from other repositories
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calendar-mcp: Instructions file for GitHub Copilot