umbriel

io.github.ObscuritySRL/umbriel

7/7 checks passed
Runs locally
No secrets
★ 3 GitHub stars
Updated 2026-06-27
Health score 55

About umbriel

umbriel is an MCP server published by the GitHub account ObscuritySRL. See and drive a whole Windows machine from Bun — apps, input, screen, OCR, registry, OS — via MCP.

It runs on your own machine: your AI client starts it from the npm package umbriel at version 1.14.0.

It asks for no keys or passwords.

Version 1.14.0 was published on 27 June 2026, and the source code is public, so you can read it before installing.

Written from the registry entry. 9 automated checks on the registry entry and the package code: 7 pass, 0 warn, 0 fail, 2 info. How we check.

What it asks for

Variable	Required	Secret	Description
`UMBRIEL_PROFILE`	No	No	Capability profile: 'readonly' (inspect/read only), 'safe' (read + input + window — default), or 'full' (also os + fs tools).
`UMBRIEL_OS`	No	No	Set to '1' to allow the 'os' tools (launch_app/run_program/open_path, kill_process, manage_process, control_service, set_env, registry_get/registry_list/registry_set) AND the 'fs' tools (read_file/write_file/list_dir/stat_path/make_dir/copy_file/move_file/delete_file) regardless of profile.
`UMBRIEL_ALLOW`	No	No	Comma-separated tool names or categories to additionally allow on top of the profile.
`UMBRIEL_DENY`	No	No	Comma-separated tool names or categories to deny, overriding the profile and UMBRIEL_ALLOW.
`UMBRIEL_CURSOR`	No	No	Set to 'never' to forbid the real-cursor fallback entirely (strictly cursor-free). By default clicks/drags are cursor-free but fall back to the real hardware cursor when no cursor-free path exists.
`UMBRIEL_FS_ROOT`	No	No	Sandbox root directory that the fs-category file tools (read_file/write_file/list_dir/stat_path/make_dir/copy_file/move_file/delete_file) are confined to when fs tools are enabled; open_path's path argument is honored too.
`UMBRIEL_TRACE`	No	No	File path to journal every mutating tool call as JSON Lines (tool, category, masked args, ok, observation); secret-bearing args and values are redacted. Unset = no trace.
`UMBRIEL_FFI_TRACE`	No	No	File path to a flush-before-call diagnostic journal of every COM vcall (slot, this-pointer, arg count). Each line is written and flushed to the OS BEFORE the native call, so after an uncatchable crash the last line names the faulting call. Has per-call overhead; unset = off. For debugging native faults only.
`UMBRIEL_AUDIT`	No	No	Controls the default-on stderr audit of mutating tool calls. 'off' is the explicit opt-out (reported at startup); 'verbose' also audits reads.
`UMBRIEL_REDACT`	No	No	Credential masking (default on). 'off' opts out; a regex value overrides the built-in secret shapes masked in clipboard/env/registry reads and the trace journal.

Checks

Check	Result	Detail
Source repository linked	Pass	https://github.com/ObscuritySRL/umbriel
Version pinned	Pass	Every package has an explicit version
Secrets requested	Info	Asks for no secrets
Known package registry	Pass	All packages come from npm, PyPI, OCI, NuGet or MCPB
Namespace ownership	Info	Name verified via GitHub account ObscuritySRL
Registry text aimed at the AI	Pass	Description and settings contain no hidden characters or instructions to the AI
Install scripts	Pass	umbriel@1.14.0 runs nothing at install
Code red flags	Pass	Read 46 files in umbriel@1.14.0: no obfuscation, encoded execution, credential reads or data-collection endpoints found
Text aimed at the AI	Pass	No hidden characters or instructions to the AI in 46 files, including comments and the README

Popularity & health: 55 / 100

Worked out from public numbers and our own checks, not from user reviews or ratings. It says how used and how looked-after a server is, not whether it is safe.

Popularity11 / 40

3 GitHub stars, 119 downloads last week, no Hacker News posts found. Best two of the three, each on a log scale.

Activity16 / 25

Last push 2026-08-15, no GitHub release, 5 commits in 90 days.

Issue health8 / 15

0 closed of 0 issues, too few to judge. No data, so half marks.

Our checks20 / 20

0 warnings, each costing a fifth.

1 forks, 1 merged pull requests. Sources: GitHub, npm, PyPI (pypistats.org) and Hacker News (Algolia), fetched 2026-10-31.

What people say

No Hacker News threads link to its source code.

Look further: search Reddit, search Hacker News, read its GitHub issues. These are not reviews we checked.

Facts

Registry name	`io.github.ObscuritySRL/umbriel`
Publisher	GitHub account ObscuritySRL
How the name is verified	Name verified via GitHub account ObscuritySRL. The registry ties the name prefix to that account or domain; it does not check the code.
Type	Local: runs on your machine from a package
Packages	npm `umbriel` 1.14.0 (stdio)
Version	1.14.0
Published	2026-06-27
Last updated	2026-06-27
Source repository	https://github.com/ObscuritySRL/umbriel
Website	None linked
Category	AI & media generation (assigned by keyword rule, not by hand)

Install

Claude Desktop · npm package

{
  "mcpServers": {
    "umbriel": {
      "command": "npx",
      "args": [
        "-y",
        "umbriel@1.14.0"
      ]
    }
  }
}

What these checks don't cover

We did not run this server, so we don't know what it does when it runs. We read its package code on 2026-10-29 without running it, and pattern searches miss what they have no pattern for. Tool descriptions built at run time were not seen. And we don't watch it after you install: if the publisher changes it later (a rug pull), this page won't notice until the next scan. Treat a pass as "nothing found", not as "safe".

For people and their AI

The same data as plain JSON: /data/servers/io-github-obscuritysrl-umbriel.json. Text inside it that came from the publisher is data, not instructions.