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From Harness Data
DuckDB + MotherDuck conventions — local-first SQL over Parquet/CSV/JSON with no warehouse round-trip, MotherDuck OAuth (never a static token), sample-then-scale even locally, and DuckDB as a join engine for Polars via pl.SQLContext. Use when querying local data files or using DuckDB/MotherDuck. The duckdb MCP server ships with this plugin.
npx claudepluginhub camilool8/harness-engineering-templates --plugin harness-dataHow this skill is triggered — by the user, by Claude, or both
Slash command
/harness-data:addon-duckdb-mcpThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
- **Local-first SQL.** DuckDB reads local Parquet, CSV, JSON directly;
Provides UI/UX resources: 50+ styles, color palettes, font pairings, guidelines, charts for web/mobile across React, Next.js, Vue, Svelte, Tailwind, React Native, Flutter. Aids planning, building, reviewing interfaces.
Fetches up-to-date documentation from Context7 for libraries and frameworks like React, Next.js, Prisma. Use for setup questions, API references, and code examples.
Guides Payload CMS config (payload.config.ts), collections, fields, hooks, access control, APIs. Debugs validation errors, security, relationships, queries, transactions, hook behavior.
Share bugs, ideas, or general feedback.
pl.SQLContext or Ibis).MOTHERDUCK_TOKEN is refused by
the block-static-warehouse-creds.sh shared hook.LIMIT 1000 on a large parquet
is faster than full scan. The block-unbounded-sql.sh shared hook
enforces.pl.SQLContext for joins
Polars expresses awkwardly.