Search, quicklook and measure Umbra's open SAR archive from any MCP client.
The current version, v0.1.1, was published to the official MCP registry on 2026-08-21. It is distributed as umbra-py on PyPI, filed under Search by this index, and declares 4 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.
Using Umbra open SAR archive 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).
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
Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.
Own this server? Screen its description →
That verdict was true at screening time (snapshot 2026-08-21). #
Contracts can change after screening, with no version bump. The gate pins Umbra open SAR archive’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 →
Related: how to trust an MCP server · screen before install · silent contract drift
UMBRA_CANOPY_TOKEN
Canopy API token. Set it and the same search tools query Umbra's authenticated commercial archive instead of the open bucket; leave it unset for the open data, which needs no credentials.
UMBRA_INDEX_DB
Path to a local catalog index (built with 'umbra index build' or fetched with 'umbra index fetch'). Without one the server walks the public bucket per search, which is correct but slow.
ANTHROPIC_API_KEY
Enables the two opt-in model tools, describe_scene and narrate_change. Every other tool is deterministic and calls no model.
OPENAI_API_KEY
Alternative provider for the same two model tools, and the encoder behind find_similar_text.
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