three.ws Provenance
Append-only, signed, on-chain-verifiable agent action log — record and audit what agents did.
Using three.ws Provenance 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-wireSemantic screen found no manipulation pattern in the description. Conformance probe not yet run.
mcpindex.integrity.descriptionpassINFOevidence“No secret file access or data exfiltration mentioned”via static_description
- - 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 2026-08-08).
Contracts can change after screening, with no version bump. The gate pins three.ws Provenance’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
A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.
[](https://mcpindex.ai/server/io-github-nirholas-provenance-mcp)<a href="https://mcpindex.ai/server/io-github-nirholas-provenance-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-nirholas-provenance-mcp" alt="mcpindex verdict" height="20" /></a>THREE_WS_BASEBase URL of the three.ws API that serves the agent-actions ledger. Override only when self-hosting or targeting a preview deployment.
THREE_WS_TIMEOUT_MSPer-request timeout in milliseconds for the ledger reads/appends.
THREE_WS_TOKENBearer token authenticating every call — a three.ws API key (sk_live_…) or an OAuth access token. The ledger is owner-scoped: you can read and append actions only for agents your token owns. Required for all three tools. Treat like a password.
THREE_WS_SIGNER_KEYOptional 0x-prefixed EVM private key. When set, append_agent_action ERC-191-signs each action so anyone can ecrecover the signer and verify authorship on-chain. A per-call `signer_key` arg overrides it. Omit to append unsigned. Treat like cash.
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