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MCP servers (called functions in Blaxel API) are lightweight programs that expose specific capabilities (accessing databases, APIs, local files, etc.) through the standardized Model Context Protocol (MCP). They are designed to equip agents with tools to interact with the world.

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Essentials

MCP Server Hosting is a serverless computing service that allows you to host remote MCP servers without having to manage infrastructure. It gives you full observability and tracing out of the box. You only provide the MCP server code, and Blaxel automates its hosting, execution and scaling - providing you with one single global endpoint to access the MCP server. The deployed server uses streamable HTTP as the transport layer. Blaxel SDK allows to retrieve the tools from an MCP server in your code. When both an agent and MCP server run on Blaxel, the tool call in the MCP server is execute separately from the agent logic. This ensures not only optimal resource utilization, but also better design practice for your agentic system.

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Requirements & limitations

  • Your MCP server must implement streamable HTTP as its transport layer.
  • Deployed MCP servers have a maximum runtime of 15 minutes.

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MCP hosting on Blaxel

Blaxel uses streamable HTTP as its MCP transport mechanism. MCP servers deployed on Blaxel are only hosted server-side and cannot be installed locally.
For developers interested in the technical details, our implementation is available open-source through Blaxel’s Supergateway and Blaxel’s SDK.
There are two routes you can take when hosting MCPs on Blaxel:

Adapt an existing MCP server

Convert a stdio MCP server to streamable HTTP and deploy it.

Develop a custom MCP server

Build a new MCP server from scratch with Blaxel SDK.

Deploy an MCP server

Host your MCP server on Blaxel as a serverless endpoint.

Connect to an MCP server

Run tool calls through your deployed MCP server.

Code mode

Turn any OpenAPI spec into a code mode MCP server.

Variables and secrets

Manage environment variables and secrets for MCP servers.
MCP servers integrate with other Blaxel products. Agents use MCP servers as tools, sandboxes include a built-in MCP server for agent-driven operations, and model APIs provide the LLM backbone for agent reasoning. See the SDK reference for programmatic access.
Last modified on March 26, 2026