Snippy · Intelligent Code-Snippet Service with MCP Tools

Snippy is an Azure Functions–based reference application that turns any function into an MCP (Model Context Protocol) tool consumable by GitHub Copilot Chat and other MCP‑aware clients. The sample implements a production‑style code‑snippet service with AI‑powered analysis:

• Save snippets – persists code, metadata and OpenAI embeddings in Cosmos DB DiskANN
• Semantic retrieve – vector search over embeddings
• AI Agents – generate a deep wiki or language‑specific code style guide from stored snippets
• Durable fan‑out/fan‑in with Blueprints – in experimental branch for large‑scale processing
• Microsoft Fabric integration – in gk/fabric branch demonstrating how to build Agents with Fabric Data Agents

The project ships with reproducible azd infrastructure, so azd up will stand up the entire stack – Functions, Cosmos DB, Azure OpenAI and Azure AI Agents – in a single command.

Important Security Notice This repository is intended for learning and demonstration purposes. Do not deploy it to production without a thorough security review. At a minimum you should:

• Swap connection strings for Managed Identity + Azure Key Vault
• Restrict network access to Azure services via Private Endpoints or service‑tags
• Enable GitHub secret‑scanning and CI security tools

Features • Architecture • Getting Started • Guidance

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Features

• Remote MCP trigger – expose Functions as real‑time SSE tools
• AI‑assisted documentation – "deep‑wiki" and "code‑style" agents create rich Markdown (Mermaid, diagrams, etc.)
• Vector search on Cosmos DB DiskANN – low‑latency semantic retrieval
• One‑click deploy – azd up provisions and deploys code & infra
• Codespaces & Dev Containers – fully configured dev environment in your browser or local VS Code

Tool Matrix

Tool Name	Purpose
save_snippet	Save code snippets with vector embeddings for semantic search
get_snippet	Retrieve previously saved code snippets by their unique name
code_style	Generate language-specific code style guides from saved snippets
deep_wiki	Create comprehensive wiki documentation by analyzing code snippets

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Architecture Diagram

flowchart LR
    %% ─── MCP Hosts & Clients (local) ──────────────────────────────
    subgraph mcphosts["MCP Hosts & Clients (Your Computer)"]
        Host["Host<br/>(VS Code / IDE)"]
        Client["Client<br/>(GitHub Copilot)"]
    end

    %% ─── Application on Azure (remote) ────────────────────────────
    subgraph app["Application (Azure)"]
        Snippy["MCP Server<br/>Snippy Triggers<br/>(Function App)"]:::dashed
        Foundry["Foundry Agent<br/>Deep Wiki · Code Style"]
        Cosmos["Cosmos DB<br/>Operational + Vector DB"]:::datasource
        AOAI["Azure OpenAI<br/>text‑embedding‑3‑small"]
        FabricDA["Fabric – Data Agent"]
        VectorTool["Tools – Vector Search"]
    end

    %% ─── Local interactions ───────────────────────────────────────
    Host <--> Client

    %% ─── MCP protocol to Azure ────────────────────────────────────
    Client <-- "MCP Protocol (SSE)" --> Snippy

    %% ─── Bindings & data flow inside Azure ────────────────────────
    Snippy -- Bindings --> AOAI
    Snippy --> Cosmos
    Snippy --> Foundry
    Foundry --> FabricDA
    Foundry --> VectorTool

    %% ─── Styling ──────────────────────────────────────────────────
    classDef datasource stroke-width:2,stroke-dasharray:5 5
    classDef dashed stroke-width:2,stroke-dasharray:5 5,fill:transparent
    class Cosmos datasource
    class Snippy dashed
    style mcphosts fill:transparent
    style app fill:transparent

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Getting Started

You can run Snippy in GitHub Codespaces, VS Code Dev Containers, or your local environment. The fastest path is Codespaces.

Snippy requires an Azure region that supports text‑embedding‑3‑small (or a compatible embeddings model) and Azure AI Agents. The azd workflow prompts you for a region; we recommend eastus for best availability.

GitHub Codespaces

1. Click Open in Codespaces above (first badge) – the container build may take a few minutes.

2. When the terminal appears, sign in:

   azd auth login --use-device-code

3. Launch the stack:

   azd up

4. Once deployment completes, copy the printed MCP URL and open GitHub Copilot Chat → Agent mode to try commands like “Save this snippet as hello‑world”.

VS Code Dev Containers

Prerequisites: Docker Desktop + the Dev Containers extension.

1. Click the Dev Containers badge (second badge) or run Remote‑Containers: Open Repository in Container from VS Code.

2. Sign in and launch as shown for Codespaces:

   azd auth login
   azd up

Local Environment

Prerequisites

• azd CLI
• Python 3.11 + uv
• Node 18+ (for Functions Core Tools)
• Azure Functions Core Tools v4 (npm i -g azure-functions-core-tools@4 --unsafe-perm)

Quickstart

# 1. Clone & init
azd init --template Azure-Samples/snippy

# 2. Sign in
azd auth login

# 3. Provision & deploy
azd up

The CLI prints the Function App URL, MCP endpoint and system key when finished. To remove all resources later:

azd down --purge

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Guidance

Region Availability

Azure OpenAI model support varies by region. Verify availability here and choose the same region for all Azure resources. eastus and swedencentral are good default choices.

Costs

Estimate monthly cost using the Azure Pricing Calculator. Major components:

• Azure Functions – Consumption / Flex tiers
• Cosmos DB – Serverless or provisioned throughput
• Azure OpenAI – pay‑as‑you‑go per 1K tokens
• Azure AI Agents – per‑execution billing (preview)

Security

Snippy uses User-Assigned Managed Identity for secure service-to-service authentication. The infrastructure is configured with:

• User-Assigned Managed Identity on the Function App with appropriate RBAC roles:
  • Cosmos DB Data Contributor
  • Storage Blob Data Owner and Queue Data Contributor
  • Application Insights Monitoring Metrics Publisher
  • Azure AI Project Developer

For production deployments, we recommend:

• Restrict inbound traffic with Private Endpoints + VNet integration
• Enable network security features like service endpoints and firewall rules

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Resources

• Blog – Build AI agent tools using Remote MCP with Azure Functions (https://aka.ms/snippy-blog)
• Model Context Protocol spec – https://aka.ms/mcp
• Azure Functions Remote MCP docs – https://aka.ms/azure-functions-mcp
• Develop Python apps for Azure AI – https://learn.microsoft.com/azure/developer/python/azure-ai-for-python-developers

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Contributing

Standard fork → branch → PR workflow. Use Conventional Commits (feat:, fix:) in commit messages.

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License

MIT © Microsoft Corporation