Hmr: MCP server, setup and security

What Hmr does

According to its repository: “Docs for hot-module-reload and reactive programming for Python (`hmr` on PyPI)”

The Model Context Protocol (MCP) is a standard plug between an AI agent and an outside service: once the server is connected, its tools show up in the agent, which decides when to call them. Hmr is listed under Developer tools, a category of 475 servers in the directory, where it ranks #238 by stars.

Topics declared by the repository: hmr, hot-reload, reactive, uvicorn, reload, metaprogramming.

Installing and connecting Hmr

Distribution modes declared in the official MCP registry:

• remote server (streamable-http): you connect to it by URL, with nothing to install locally

It works with any MCP-compatible client (Claude Desktop, Claude Code, Cursor, VS Code, Codex and most recent agents). You add one entry to the client's MCP configuration: server name, start command or URL, environment variables. Project language: Python.

Security: what to check

Connecting an MCP server means installing software that talks straight to your agent: it runs with your rights and the model trusts its tool descriptions. The risk therefore depends on what it can touch and how far its code can be trusted.

Points found for Hmr:

• No licence: without a licence the code is not legally reusable, even if it is public. Avoid it in a company setting without the author's agreement.

Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.

Project activity and maintenance

Created on January 10, 2025, the promplate/hmr repository has 59 stars and 7 forks, with 11 open issues. It has more stars than 55% of the servers in the directory. It received changes this month. Version published in the registry: 1.0.2 (September 17, 2025).

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.