Master the Plumb-Line Method: AI Skill for Codex & Claude

Master the Plumb-Line Method: AI Skill for Codex & Claude

The "Master the Plumb-Line Method" skill equips builders with the discipline of epistemic honesty through a structured educational guide. It instructs users in the plumb-line method, focusing on its thesis, nine portable principles, maturity vocabulary, and a straightforward one-line test. This AI skill is designed to impart pure knowledge without performing any automated actions.

What this skill does

• Reads the principles document from reference/portable-principles.md.
• Introduces the thesis and the spine to the builder.
• Guides users through the nine principles, prioritising relevance to current tasks.
• Concludes with the one-line test for an immediate gut-check on understanding.
• Presents the next steps to ensure users know how to start applying the method practically.
• Mentions the availability of the plumb-line-provenance library for enforcing two specific principles.

Who it is for

This skill is intended for developers and teams using AI coding agents like Codex, Claude Code, and Cursor. It particularly benefits those working in environments focused on enhancing epistemic integrity within AI projects.

Use cases

• A developer needing a refresher on the plumb-line method for maintaining transparency in AI processes.
• Teams integrating epistemic honesty into their software development lifecycle.
• Projects requiring a structured approach to ensure consistent understanding and application of the plumb-line principles.

Technical details

• Compatible with AI coding agents: Codex, Claude Code, and Cursor.
• Utilises ai-tooling and aiapplication for effective knowledge transfer.
• Integration with plumb-line-provenance, a zero-dependency JS and Python library, when teaching applicable principles.

Source & Licence

This package is built on open-source work published by slopstopper (slopstopper/plumb-line) and distributed under Apache-2.0. The original licence text and copyright notice are included in your download.

Personal and commercial use, modification and redistribution are permitted under the Apache License 2.0, which also includes an express patent grant. Attribution and any NOTICE file must be retained.

Your purchase covers curation, licence verification, packaging, documentation and instant delivery. It does not grant exclusive rights to the underlying open-source code, which remains available under its original licence.

Delivery & Support

• Delivery: instant — a secure download link is emailed to you as soon as payment is confirmed.
• Format: ZIP archive containing the skill files, documentation and the original licence.
• Support: support@mcpcart.com — we aim to reply within 2 business days.
• Updates: updates are included only where stated on this page.

Refunds

This is a digital product delivered immediately after purchase. By completing your order you request immediate delivery and acknowledge that, once the download has been accessed, the statutory right to cancel no longer applies to the extent permitted by law. Refund requests are handled in accordance with our published Refund Policy.

Claude, Codex, Gemini and Cursor are trademarks of their respective owners. MCP Cart is an independent marketplace and is not affiliated with, endorsed by, or sponsored by any of them. Compatibility references describe interoperability only.