Orionbelt Semantic Layer MCP Server

OrionBelt Semantic and Context Layer, Rule Engine, and Semantic Sidecar Define your metrics once in YAML. Let agents and BI tools query them without ever touching your schema. It runs locally over stdio via the published package.

People who work with clickhouse, databricks and dremio and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-29 · ★ 98 · #24 OF 174 MAINTAINED DATABASE · VERIFIED 2026-09-30

NOASSERTION · Python servers · how we verify → /methodology

01 · Install Orionbelt Semantic Layer

before you install - you'll need

Set FLIGHT_ENABLED, PGWIRE_ENABLED, API_BASE_URL before connecting.

Claude Code

claude mcp add ralfbecher-orionbelt-semantic-layer -- uvx orionbelt-semantic-layer

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "ralfbecher-orionbelt-semantic-layer": {
      "command": "uvx",
      "args": [
        "orionbelt-semantic-layer"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

pypi package orionbelt-semantic-layer - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.ralfbecher is GitHub-verified and matches the repo owner

03 · What Orionbelt Semantic Layer can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v2.32.0 · 2026-09-26

[2.32.0] - 2026-09-26 · Added · Lineage of dimensions, measures, metrics, rules and queries. A lineage follows references down to the tables: columns (computed columns included), filter and grain columns, the measures…

v2.31.2 · 2026-09-25

[2.31.2] - 2026-09-25 · Fixed · The OBML reference documents pathName. GET /v1/reference/obml, the text MCP and LLM clients author models from, had no word on secondary joins or role dimensions, so an agent could not…

v2.31.1 · 2026-09-24

[2.31.1] - 2026-09-24 · Fixed · The PostgreSQL wire catalog connection is isolated and restricted. Statements that are not semantic queries (catalog probes, BI metadata browsing, Tableau's temp-table connect check) run…

04 · Who maintains Orionbelt Semantic Layer

orionbelt-semantic-layer is maintained by ralfbecher. We track 2 MCP servers from ralfbecher - 2 actively maintained, 146 combined GitHub stars, oldest repo from Feb 2026. Full record: all servers from ralfbecher.

orionbelt-analytics Ontology-based MCP server for database schema analysis and RDF/OWL ontology generation ★ 48

05 · Facts

repository: github.com/ralfbecher/orionbelt-semantic-layer
category: database - ranked #24 of 174 actively-maintained database servers as of 2026-09-30.
release cadence: 10+ releases in the last 90 days (latest 2026-09-26)
registry: io.github.ralfbecher/orionbelt-semantic-layer (active, first published 2026-02-19 · 2 versions)
packages: pypi:orionbelt-semantic-layer

06 · Orionbelt Semantic Layer FAQ

What is Orionbelt Semantic Layer?

Is Orionbelt Semantic Layer still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-29 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Orionbelt Semantic Layer?

Run `uvx orionbelt-semantic-layer`. The README documents 3 environment variables (FLIGHT_ENABLED, PGWIRE_ENABLED, API_BASE_URL) to set first. Set FLIGHT_ENABLED, PGWIRE_ENABLED, API_BASE_URL before connecting. You can also paste the ready-made client config above.

Does Orionbelt Semantic Layer run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Orionbelt Semantic Layer

Alternatives to Orionbelt Semantic Layer

Maintained database servers if Orionbelt Semantic Layer isn't the fit.

Pairs well with

Servers that cover what Orionbelt Semantic Layer doesn't - only shown when the pairing reason fits the companion.

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