S3 Vectors MCP Server

[!NOTE] This README was generated with Amazon Q Developer.

A Model Context Protocol (MCP) server that provides tools for interacting with AWS S3 Vectors service. This server enables AI assistants to embed text using Amazon Bedrock models and store/query vector embeddings in S3 Vectors indexes.

Features

• Vector Embedding: Convert text to vector embeddings using Amazon Bedrock models
• Vector Storage: Store embeddings in AWS S3 Vectors indexes with optional metadata
• Similarity Search: Query for similar vectors with advanced filtering capabilities
• Multiple Transports: Support for stdio, Server-Sent Events (SSE), and StreamableHTTP
• Flexible Configuration: Environment variable and parameter-based configuration

Prerequisites

• Python 3.11 or higher
• AWS credentials configured (via AWS CLI, environment variables, or IAM roles)
• Access to Amazon Bedrock embedding models
• An existing S3 Vectors bucket and index

AWS Permissions

Your AWS credentials need permissions for:

• Amazon Bedrock: bedrock:InvokeModel for embedding models
• S3 Vectors: s3:GetObject, s3:PutObject for vector operations

Installation

Quick Install

pip install git+https://github.com/moritalous/s3-vectors-mcp.git

Development Install

# Clone the repository
git clone https://github.com/moritalous/s3-vectors-mcp.git
cd s3-vectors-mcp

# Install with uv (recommended)
uv sync

# Or install with pip
pip install -e .

Configuration

The server uses environment variables for configuration:

Variable	Required	Description	Example
S3VECTORS_BUCKET_NAME	Yes	S3 bucket name for vector storage	my-vectors-bucket
S3VECTORS_INDEX_NAME	Yes	Vector index name	my-index
S3VECTORS_MODEL_ID	Yes	Bedrock embedding model ID	amazon.titan-embed-text-v2:0
S3VECTORS_DIMENSIONS	No	Embedding dimensions	1024
S3VECTORS_REGION	No	AWS region	us-east-1
S3VECTORS_PROFILE	No	AWS profile name	default

Example Configuration

export S3VECTORS_BUCKET_NAME="my-vectors-bucket"
export S3VECTORS_INDEX_NAME="my-index"
export S3VECTORS_MODEL_ID="amazon.titan-embed-text-v2:0"
export S3VECTORS_DIMENSIONS="1024"
export S3VECTORS_REGION="us-east-1"

Usage

Running the Server

The server supports three transport modes:

# Using stdio transport (default, for MCP clients)
uv run s3-vectors-mcp stdio

# Using Server-Sent Events
uv run s3-vectors-mcp sse

# Using StreamableHTTP
uv run s3-vectors-mcp streamable-http

Development Mode

# With uv (using Python module)
uv run python -m s3_vectors_mcp stdio

# With uv (using script entry point)
uv run s3-vectors-mcp stdio

# With pip (if installed globally)
s3-vectors-mcp stdio

MCP Client Integration

Amazon Q Developer

For Amazon Q Developer, create or update your MCP configuration file (.amazonq/mcp.json):

{
  "mcpServers": {
    "s3vector": {
      "command": "uv",
      "args": [
        "run",
        "s3-vectors-mcp"
      ],
      "env": {
        "S3VECTORS_BUCKET_NAME": "your-vectors-bucket",
        "S3VECTORS_INDEX_NAME": "your-index",
        "S3VECTORS_MODEL_ID": "amazon.titan-embed-text-v2:0",
        "S3VECTORS_DIMENSIONS": "1024",
        "S3VECTORS_REGION": "us-east-1"
      },
      "timeout": 120000,
      "disabled": false
    }
  }
}

Claude Desktop

For Claude Desktop, add to your MCP client configuration:

{
  "mcpServers": {
    "s3-vectors": {
      "command": "uv",
      "args": [
        "run",
        "s3-vectors-mcp"
      ],
      "env": {
        "S3VECTORS_BUCKET_NAME": "your-vectors-bucket",
        "S3VECTORS_INDEX_NAME": "your-index",
        "S3VECTORS_MODEL_ID": "amazon.titan-embed-text-v2:0",
        "S3VECTORS_DIMENSIONS": "1024",
        "S3VECTORS_REGION": "us-east-1"
      }
    }
  }
}

Configuration Notes

• Replace your-vectors-bucket and your-index with your actual S3 bucket and index names
• The timeout setting (120000ms = 2 minutes) allows for longer embedding operations
• Set disabled: false to enable the server
• The uv run command assumes you have the project installed in development mode

Available Tools

s3vectors_put

Embed text and store as vector in S3 Vectors.

Parameters:

• text (string, required): Text to embed and store
• vector_id (string, optional): Custom vector ID (auto-generated if not provided)
• metadata (object, optional): Additional metadata to store with the vector

Example:

{
  "text": "This is a sample document about machine learning.",
  "vector_id": "doc-001",
  "metadata": {
    "category": "documentation",
    "version": "1.0",
    "author": "John Doe"
  }
}

s3vectors_query

Query for similar vectors in S3 Vectors.

Parameters:

• query_text (string, required): Text to query for similar vectors
• top_k (integer, optional): Number of similar vectors to return (default: 10)
• filter_expr (object, optional): Metadata filter expression
• return_metadata (boolean, optional): Include metadata in results (default: true)
• return_distance (boolean, optional): Include similarity distance (default: false)

Example:

{
  "query_text": "machine learning algorithms",
  "top_k": 5,
  "filter_expr": {
    "$and": [
      {"category": {"$eq": "documentation"}},
      {"version": {"$gte": "1.0"}}
    ]
  },
  "return_metadata": true,
  "return_distance": true
}

Filter Expressions

The s3vectors_query tool supports advanced filtering using AWS S3 Vectors API operators:

Comparison Operators

• $eq: Equal to
• $ne: Not equal to
• $gt: Greater than
• $gte: Greater than or equal to
• $lt: Less than
• $lte: Less than or equal to
• $in: Value in array
• $nin: Value not in array

Logical Operators

• $and: Logical AND (all conditions must be true)
• $or: Logical OR (at least one condition must be true)
• $not: Logical NOT (condition must be false)

Filter Examples

Simple equality:

{"category": {"$eq": "documentation"}}

Multiple conditions:

{
  "$and": [
    {"category": "tech"},
    {"version": {"$gte": "2.0"}},
    {"status": {"$ne": "archived"}}
  ]
}

Complex nested conditions:

{
  "$or": [
    {
      "$and": [
        {"category": "docs"},
        {"version": "1.0"}
      ]
    },
    {
      "$and": [
        {"category": "guides"},
        {"version": "2.0"}
      ]
    }
  ]
}

Supported Embedding Models

This server works with Amazon Bedrock embedding models, including:

• amazon.titan-embed-text-v1
• amazon.titan-embed-text-v2:0
• amazon.titan-embed-image-v1
• cohere.embed-english-v3
• cohere.embed-multilingual-v3

Refer to the Amazon Bedrock documentation for the complete list of available models.

Dependencies

This project is built on top of:

• MCP Python SDK: Provides the Model Context Protocol implementation
• S3 Vectors Embed CLI: Core library for S3 Vectors operations and Bedrock integration

Development

Project Structure

s3-vectors-mcp/
├── src/
│   └── s3_vectors_mcp/
│       ├── __init__.py
│       ├── __main__.py
│       └── server.py
├── pyproject.toml
├── README.md
└── LICENSE

Running Tests

# Install development dependencies
uv sync --dev

# Run linting
uv run ruff check
uv run ruff format --check

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Run linting and tests
6. Submit a pull request

Troubleshooting

Common Issues

ModuleNotFoundError: Ensure the package is properly installed and you're using the correct Python environment.

AWS Credentials: Verify your AWS credentials are configured correctly:

aws sts get-caller-identity

Bedrock Access: Ensure you have access to the specified Bedrock model:

aws bedrock list-foundation-models --region us-east-1

S3 Vectors Setup: Verify your S3 bucket and vector index exist and are properly configured.

Debug Mode

Enable debug logging by setting the log level:

export PYTHONPATH=.
python -c "import logging; logging.basicConfig(level=logging.DEBUG)"
s3-vectors-mcp stdio

License

This project is licensed under the MIT License. See the LICENSE file for details.

Related Projects

• Model Context Protocol - The protocol specification
• MCP Python SDK - Python implementation of MCP
• S3 Vectors Embed CLI - Command-line tool for S3 Vectors
• Amazon S3 Vectors - AWS documentation

Support

For issues and questions:

• Check the troubleshooting section
• Review the AWS S3 Vectors documentation
• Open an issue in this repository