Plumbline MCP MCP server

Plumbline is an MCP server that acts as a trust layer for LLM answers by checking figures against SQL-computed facts from a dataset. It verifies data accuracy, labels outputs with provenance, and refuses to answer questions unsupported by the evidence, providing an audit trail for every response.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Lattice Systems

MCP endpoint (Streamable HTTP)

https://plumbline.lattice-sys.com/mcp/demo

Vendor documentation

What you can do with it

Verify LLM-generated figures against SQL-computed facts
Refuse unsupported questions with specific reasons
Analyze compensation outliers with per-figure provenance
Generate audit trails for answer verification

Tools advertised by the last live check:

ask_prepare
ask_result
ask_submit_draft
compare_departments
cross_check
describe_fact_capabilities
find_payroll_anomalies
get_ai_act_transparency
get_answer_queries
get_evidence_document
get_manager_chain
query_fact
run_code
run_sql
search_docs
search_employee
summarize_benefits
trust_finalize

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http plumbline-mcp https://plumbline.lattice-sys.com/mcp/demo

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add plumbline-mcp --url https://plumbline.lattice-sys.com/mcp/demo

Cursor

Merge this server into .cursor/mcp.json in your project, then enable plumbline-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "plumbline-mcp": {
      "url": "https://plumbline.lattice-sys.com/mcp/demo"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "plumbline-mcp": {
      "type": "streamableHttp",
      "url": "https://plumbline.lattice-sys.com/mcp/demo",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start plumbline-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "plumbline-mcp": {
      "type": "http",
      "url": "https://plumbline.lattice-sys.com/mcp/demo"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http plumbline-mcp https://plumbline.lattice-sys.com/mcp/demo

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "plumbline-mcp": {
      "url": "https://plumbline.lattice-sys.com/mcp/demo"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "plumbline-mcp": {
      "serverUrl": "https://plumbline.lattice-sys.com/mcp/demo"
    }
  }
}

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