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units-static

units-static

by plugin-federation
OverviewSchemaSourceRelated ServersDiscussionsAdmin
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

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Maintenance

ActivityStale
ResponsivenessNo issues

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