io.github.ObscuritySRL/umbriel

io.github.ObscuritySRL/umbrielv1.14.0Cloud Storage

See and drive a whole Windows machine from Bun — apps, input, screen, OCR, registry, OS — via MCP.

In-path gate · all MCP tools

Using io.github.ObscuritySRL/umbriel in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

REVIEWstatus: PARTIALfresh until 2026-08-20 09:02 UTC

screened 2026-07-21tier: scannedgranularity: description-levelsource: registry

Semantic screen flagged a possible manipulation pattern in the description; review before your agent calls this tool.

held for reviewThe semantic screen raised a flag, but it has not been human-reviewed. It is held - not a confirmed finding - until a reviewer confirms or clears it.

mcpindex.integrity.descriptionfailLOW

evidence“drives whole Windows machine without user request”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-08-04).

Contracts can change after screening, with no version bump. The gate pins io.github.ObscuritySRL/umbriel’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

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A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-obscuritysrl-umbriel)](https://mcpindex.ai/server/io-github-obscuritysrl-umbriel)

HTML

<a href="https://mcpindex.ai/server/io-github-obscuritysrl-umbriel"><img src="https://mcpindex.ai/api/v1/badge/io-github-obscuritysrl-umbriel" alt="mcpindex verdict" height="20" /></a>

Environment variables

UMBRIEL_PROFILE

Capability profile: 'readonly' (inspect/read only), 'safe' (read + input + window — default), or 'full' (also os + fs tools).

UMBRIEL_OS

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

Comma-separated tool names or categories to additionally allow on top of the profile.

UMBRIEL_DENY

Comma-separated tool names or categories to deny, overriding the profile and UMBRIEL_ALLOW.

UMBRIEL_CURSOR

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

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

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

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

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

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.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "umbriel": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "umbriel"
      ],
      "env": {
        "UMBRIEL_PROFILE": "safe",
        "UMBRIEL_OS": "<umbriel_os>",
        "UMBRIEL_ALLOW": "<umbriel_allow>",
        "UMBRIEL_DENY": "<umbriel_deny>",
        "UMBRIEL_CURSOR": "<umbriel_cursor>",
        "UMBRIEL_FS_ROOT": "<umbriel_fs_root>",
        "UMBRIEL_TRACE": "<umbriel_trace>",
        "UMBRIEL_FFI_TRACE": "<umbriel_ffi_trace>",
        "UMBRIEL_AUDIT": "<umbriel_audit>",
        "UMBRIEL_REDACT": "<umbriel_redact>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "umbriel": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "umbriel"
      ],
      "env": {
        "UMBRIEL_PROFILE": "safe",
        "UMBRIEL_OS": "<umbriel_os>",
        "UMBRIEL_ALLOW": "<umbriel_allow>",
        "UMBRIEL_DENY": "<umbriel_deny>",
        "UMBRIEL_CURSOR": "<umbriel_cursor>",
        "UMBRIEL_FS_ROOT": "<umbriel_fs_root>",
        "UMBRIEL_TRACE": "<umbriel_trace>",
        "UMBRIEL_FFI_TRACE": "<umbriel_ffi_trace>",
        "UMBRIEL_AUDIT": "<umbriel_audit>",
        "UMBRIEL_REDACT": "<umbriel_redact>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- umbriel

Claude Code (claude mcp add)

claude mcp add --scope user umbriel -- npx -y -- umbriel

Gemini CLI (gemini mcp add)

gemini mcp add -s user umbriel npx -y -- umbriel

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-obscuritysrl-umbriel

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v1.14.0
category: Cloud Storage
verdict expires: 2026-08-20
quality: 84 / 100
operator: ObscuritySRL

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Email us →

Provenance

Each verdict is bound to a hash of the exact description it judged, so a re-crawl that changes the text produces a new record rather than silently inheriting this one. Verdict history is hash-chained and anchored to Bitcoin via OpenTimestamps (latest confirmed at block 960,824). Verify it yourself.

Links

Repository →