Claude Desktop Umbra open SAR archive stack_stats
How to: Claude Desktop Umbra open SAR archive stack_stats
Add Umbra open SAR archive to Claude Desktop
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01
Open ~/Library/Application Support/Claude/claude_desktop_config.json and merge this in. Keep any servers already there.
{
"mcpServers": {
"umbra-mcp": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://api.umbra-py.space/mcp"
]
}
}
}-
02
Save the file and restart Claude Desktop.
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03
Ask for something stack_stats does. Claude Desktop lists the server's tools on connect and calls stack_stats itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that Umbra open SAR archive's identifier in your config matches the one above exactly.
Claude Desktop has no remote transport in its config file, so this bridges through mcp-remote. Restart the app after saving. Claude Desktop docs
Set these first
Umbra open SAR archive will not start until these are set, so stack_stats never becomes available.
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UMBRA_CANOPY_TOKEN -
UMBRA_INDEX_DB -
ANTHROPIC_API_KEY -
OPENAI_API_KEY
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 14 November 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.