# Umbra open SAR archive (io.github.reesehammer/umbra-mcp@0.1.1) > Source: > Published: 2026-08-21 22:11:22+00:00 [← Index](/leaderboard) # Umbra open SAR archive 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](/stats) 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 ``` [method](/methodology) 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](/methodology). Own this server? [Screen its description →](/screen) ## 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 →](/guides/install-the-gate-first-hold) Related: [how to trust an MCP server](/guides/how-to-trust-an-mcp-server) · [screen before install](/guides/screen-mcp-server-before-install) · [silent contract drift](/guides/mcp-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. [methodology](/methodology) [YTDL RMCPai.dinglebear/rytdl](/server/ai-dinglebear-rytdl) yt-dlp search, download, metadata, delivery, and Plex workflows over MCP and CLI. [Fodda Topic & Trend Researchai.fodda/topic-research](/server/ai-fodda-topic-research) Trend, stats & insight search across PSFK expert graphs with citable sources. [io.github.ref-tools/ref-tools-mcpio.github.ref-tools/ref-tools-mcp](/server/io-github-ref-tools-ref-tools-mcp) Token efficient search for coding agents over public and private documentation.