Context

A Model Context Protocol (MCP) server that provides persistent context management for AI agents like Cursor, Claude Code, and Claude Desktop. Uses Upstash Vector DB for storage and Google AI for embeddings.

Features

• Add Context: Store text with metadata, automatically embedded and indexed
• Query Context: Semantic search to find relevant stored information
• Batch Operations: Efficiently add or delete multiple contexts
• Metadata Filtering: Filter queries by metadata attributes
• Statistics: Monitor your vector database usage

Prerequisites

1. Upstash Vector DB account - Sign up at Upstash

   • Create a new Vector Index with dimension 768 (for Google's text-embedding-004)
   • Get your REST URL and Token

2. Google AI API Key - Get from Google AI Studio

Installation

# Clone the repository
git clone <your-repo-url>
cd context-mcp

# Install dependencies
npm install

# Build the project
npm run build

Configuration

Create a .env file based on .env.example:

cp .env.example .env

Fill in your credentials:

UPSTASH_VECTOR_REST_URL=your_upstash_vector_url
UPSTASH_VECTOR_REST_TOKEN=your_upstash_vector_token
GOOGLE_AI_API_KEY=your_google_ai_api_key

Usage with AI Agents

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "context": {
      "command": "node",
      "args": ["path/to/context-mcp/dist/index.js"],
      "env": {
        "UPSTASH_VECTOR_REST_URL": "your_url",
        "UPSTASH_VECTOR_REST_TOKEN": "your_token",
        "GOOGLE_AI_API_KEY": "your_key"
      }
    }
  }
}

Cursor

Add to your Cursor MCP settings:

{
  "mcpServers": {
    "context": {
      "command": "node",
      "args": ["path/to/context-mcp/dist/index.js"],
      "env": {
        "UPSTASH_VECTOR_REST_URL": "your_url",
        "UPSTASH_VECTOR_REST_TOKEN": "your_token",
        "GOOGLE_AI_API_KEY": "your_key"
      }
    }
  }
}

Claude Code (Windsurf)

Add to your MCP configuration file.

Available Tools

add_context

Store a single piece of context.

Parameters:

• id (required): Unique identifier
• content (required): Text content to store
• metadata (optional): Key-value pairs for filtering

add_contexts_batch

Store multiple contexts efficiently.

Parameters:

• contexts (required): Array of {id, content, metadata} objects

query_context

Search for relevant contexts.

Parameters:

• query (required): Natural language search query
• topK (optional): Number of results (1-20, default: 5)
• filter (optional): Upstash filter expression

delete_context

Delete a single context by ID.

Parameters:

• id (required): ID of context to delete

delete_contexts_batch

Delete multiple contexts.

Parameters:

• ids (required): Array of IDs to delete

get_stats

Get database statistics (vector count, dimensions).

Example Usage

Once connected, you can ask your AI agent to:

"Add this project documentation to my context with id 'project-readme'"

"Search my context for information about authentication"

"Store these meeting notes with category 'meetings' and date '2024-01-15'"

"What relevant context do I have about the payment system?"

Upstash Filter Syntax

When querying, you can filter by metadata:

# Exact match
category = 'meetings'

# Numeric comparison  
priority > 5

# Multiple conditions
category = 'docs' AND priority >= 3

Development

# Run in development mode
npm run dev

# Build for production
npm run build

# Start production server
npm start

License

MIT