Resources

Engineering write-ups from building Chion's SQL pipeline

These write-ups came out of problems that showed up while building Chion: how the pipeline handles a prompt-injection attempt, and what to do when Claude Code rejects a SKILL.md for its frontmatter.

Generate SQL against your live schema

Each write-up documents one mechanism in Chion's pipeline and names the code path it lives in. They are written for the engineer who has to decide whether a control actually holds.

Engineering write-ups: read-only defenses and skill files

Fix “SKILL.md must start with YAML frontmatter” at byte 1

Fix the Claude Code error SKILL.md must start with YAML frontmatter (---): the valid shape plus five ways files fail it, with broken vs fixed examples.

July 6, 2026·claude-code · skill.md · yaml-frontmatter · agent-skills

Text-to-SQL prompt injection still has to pass the SQL gate

How Chion handles text-to-sql prompt injection (OWASP LLM01): a prompt escaper, two code validators, and a 1,000-row capped database role.

May 16, 2026·security · text-to-sql · prompt-injection · postgresql