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plugin-federation

units-static

by plugin-federation
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Python
Hybrid

units-static

High-quality unit conversion MCP server with fixed conversion tables (no network I/O). Companion dogfood to meteo-static: this repo is the good MCP baseline — tools are designed so schema-clarity judges should score well (clear names, deep descriptions, strict enums, typed output schemas).

Tools

Tool

Description

list_units

List supported unit ids (optionally filter by dimension)

convert_length

Convert length between SI / imperial units

convert_mass

Convert mass / weight

convert_temperature

Convert °C / °F / K (rejects below absolute zero)

convert_volume

Convert liquid volume (US + imperial + SI)

compare_quantities

Compare two quantities in the same dimension

Related MCP server: gnomon-mcp

Design goals (judge-friendly)

  • Names: lowercase, descriptive, verb-led (convert_*, list_*, compare_*)

  • Descriptions: when to call the tool, what it does, what not to use it for

  • Inputs: closed enums / constrained fields with per-parameter descriptions

  • Outputs: Pydantic models → MCP outputSchema objects (no bare arrays)

  • Deterministic: static factor tables; safe for CI evals

Running

STDIO (default)

pip install -r requirements.txt
python src/server.py

Streamable HTTP

pip install -r requirements.txt
python src/server.py --transport http --port 8000

Export tools/list (local)

pip install -r requirements.txt
python scripts/export_tools_list.py --output ci/tools-list.json

GitHub Actions

Shared Actions from plugin-federation/actions:

Job

Purpose

tools-list-validate

Export tools/list + structural validation

nexus-catalog

OIDC → catalog, schema verify, selection-surface embeddings, LLM-as-judge (fail-on-judge-fail)

evals

Functional evals (evals/evaluations.xml, 100% threshold)

Nexus pipeline setup

Variable / secret

Purpose

NEXUS_URL

e.g. https://api.nonprod.plugin-federation.com

NEXUS_OIDC_AUDIENCE

Must match Nexus GitHub audience

TENANT_ID

Target tenant UUID

MCP_SOURCE_ID

New stable tool source UUID for this server

XAI_API_KEY

Judge model + functional evals

OPENAI_API_KEY

Embeddings (text-embedding-3-small)

Embeddings use name + description + input schema (tool-embedding-report/v1). Embed failures do not fail judges. Similarity reports are derived by Nexus from a registered semantic-analysis profile whose profileVersion and model match text-embedding-3-small (1536 dimensions unless shortened). CI cannot create that profile.

Also register this repository in the tenant OIDC trust policy (same pattern as meteo-static) and create a dedicated tool source for units-static.

Status

  • Working — stdio + streamable HTTP

  • Tools — six conversion tools with structured I/O

  • CI — Plugin Federation Actions with hard fail gates

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivitySlowing
ResponsivenessNo issues

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