io.github.elberacasa/umbra

Umbra

Is the Umbra MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.

Trust score for AI-generated code: scan repos, guard agent file writes, get a 0-100 score.

alive probed 2026-11-14 · unchanged since 2026-10-27

3tools

635tokens in Claude Opus 5.5

0.3 %of Claude's 200k window

0.3×the median server

226 msto initialize

5 msto list tools

Run it: npx -y @elberacasa/umbra@1.2.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: umbra 1.2.0
Capabilities: tools
Instructions: 560 characters
Of a 1M window: <0.1 % of a 1M context window
Count: 635 tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 659. The o200k_base estimate is 371. Counted again when the tool definitions change. Method.
Repository: https://github.com/elberacasa/umbra
Registry: active, updated 2026-08-04 · registry entry
Changes: 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.71×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
guard_content	257	150	40 %
scan_repo	228	133	36 %
get_score	151	88	24 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention umbra.

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-27 06:55	alive	245 ms	3	635	371
2026-10-20 06:41	alive	226 ms	3		371

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.