Ship Claude Code skill for xql (closes #6)#7
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Adds skill/SKILL.md — an official Claude Code skill so agents told "use xql" reach for the right binary with the right SQL subset instead of hallucinating from training data or falling back to sqlite3/DuckDB. The skill covers backend dispatch, the SQL subset with explicit non-goals (no JOINs / subqueries — reach for DuckDB), write-safety mechanics, CSV type-inference gotchas, SharePoint OData translation rules, REPL commands, and four worked recipes. Users install with `cp -r skill ~/.claude/skills/xql`. Also fixes the flagship case-fold dedup example in README.md, GRAMMAR.md, and the new skill to use `HAVING COUNT(*) > 1` instead of `HAVING n > 1` — xql's HAVING resolves against source columns and aggregates, not SELECT-list aliases, so the alias form errors at eval. Alias-in-HAVING support is worth its own follow-up issue. Author: David Anderson, with AI assistance from Claude Code. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014xByMrUTST8C4aJHnZqwxg
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Summary
skill/SKILL.md— an official Claude Code skill so agents told "use xql" reach for the right binary with the right SQL subset instead of hallucinating from training data or falling back to sqlite3/DuckDB. Users install withcp -r skill ~/.claude/skills/xql.HAVING n > 1example in README, GRAMMAR, and the new skill toHAVING COUNT(*) > 1— the alias form errors at eval today (worth its own follow-up issue).Closes #6.
Skill scope
Backend dispatch, SQL subset with explicit non-goals (no JOINs/subqueries — reach for DuckDB), write-safety mechanics (preview +
Apply? [y/N],!shortcut,--commit,--confirm-destructive), CSV type-inference gotchas (leading zeros, NaN, Excel scientific notation), SharePoint OData translation (LIKE limits, IN chain, BETWEEN, IS NULL, internal-vs-display column names), REPL commands + one-shot flags +--describe, four worked recipes (dedup, bulk-close SP items, schema-first exploration, redirect large SELECT). Version guard tells the agent to runxql --versionand expect 1.6.0+.Test plan
python3 yaml.safe_loadparses frontmatter (name + description, 471 chars — well under the 1536 combined cap).cp -r skill ~/.claude/skills/xql-test— layout matches Claude Code skill convention.--describe) prints the expected schema.--output) writes CSV to disk correctly.--commit— verified source file untouched after preview.🤖 Generated with Claude Code
https://claude.ai/code/session_014xByMrUTST8C4aJHnZqwxg