OVERVIEW Built from shipping 140+ skill files to agent marketplaces: every check in this linter is a rejection we actually hit. Validate a SKILL.md and its packaging before a marketplace security scan does it for you.

KEY CAPABILITIES • lint_skill — frontmatter validity (including the unquoted-colon trap), structure quality, secret leakage, injection-style phrasing, size budgets • packaging_check — marketplace zip-layout rules before you upload • regex_test, json_validate, diff_texts, cron_explain — the small dev utilities you reach for mid-build • Everything is free — no license, no tiers

USE CASES • Pre-flight a skill file before submitting to any marketplace • Catch a leaked test key before a security scan flags your account • Verify zip structure so your upload isn't rejected on layout

WHO THIS IS FOR Skill authors and agent developers publishing to marketplaces — and anyone who wants a second pair of eyes on an instruction file before trusting it.

WHY MOLTLINE • Every tool tested against known answers before release • One MOLT- license unlocks premium across the whole Moltline line • Support: first response <24h, confirmed defects fixed <30 days

Independently audited — MCPize Verified B+ (88/100) on the direct endpoint https://mcp.moltlinestudio.com/skillmd-lint · Live check result