Orionbelt Semantic Layer MCP Server

OrionBelt Semantic Layer and 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 connecting database tools to Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-08-24 · ★ 74 · #25 OF 151 MAINTAINED DATABASE · VERIFIED 2026-08-25

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

v2.25.1 · 2026-08-21

[2.25.1] - 2026-08-21 · Fixed · A ClickHouse FixedString is read by value rather than by storage. ClickHouse pads a FixedString to its declared width with NUL bytes, and they count as content, so a FixedString(50)…

v2.25.0 · 2026-08-20

[2.25.0] - 2026-08-20 · Added · filterContext measures are computed against their own fact, through metrics, and filtered on. A filterContext says which of the query's WHERE filters apply to a measure, and a different…

v2.24.1 · 2026-08-05

[2.24.1] - 2026-08-05 · Added · CI fails a change to the converter that the release could not publish. The bug below is only worth fixing once. scripts/check_osi_version_bump.py runs on every pull request and, when the…

04 · Who maintains Orionbelt Semantic Layer

orionbelt-semantic-layer is maintained by ralfbecher. We track 2 MCP servers from ralfbecher - 2 actively maintained, 120 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 ★ 46

05 · Facts

repository: github.com/ralfbecher/orionbelt-semantic-layer
category: database - ranked #25 of 151 actively-maintained database servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-21)
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?

OrionBelt Semantic Layer and 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.

Is Orionbelt Semantic Layer still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-24 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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