Project Cairn Skill for Claude

Project Cairn

Project Cairn gives AI-collaboration projects a durable way to keep and reuse what they learn while doing real work. The Skill supplies the method, AGENTS.md carries always-read project rules, and .cairn/config.yaml stores machine-readable configuration.

This Skill is documentation-first. It provides instructions, templates, references, and provider adapters. It has no CLI, MCP server, background hook, chat-end trigger, automatic provider write, or automatic history migration. Routine maintenance happens during normal work because AGENTS.md carries the rules. Provider writes require human confirmation.

Routing

Load exactly the reference you need:

• references/init.md — initialize, retrofit, bootstrap, or set up Project Cairn in a project.
• references/consume.md — pull, cite, reuse, or apply external knowledge from the configured knowledge base.
• references/maintenance.md — record progress, update LOG, update ROADMAP, maintain topic notes, or apply Cairn rules after work.
• references/audit.md — inspect, audit, validate, clean up, or find missing project knowledge records.
• references/upgrade.md — upgrade an initialized project instance to the current skill spec, or check how far it has drifted (instance drift after the skill itself evolved).
• references/graduation.md — graduate knowledge, move reusable experience to a knowledge base, or judge graduation-readiness; a provider write additionally reads only the selected references/graduation/<provider>.md.
• references/frontmatter.md — create or review Cairn topic notes or knowledge-base notes.
• references/branch-closure.md — review, close, abandon, or roll back an exploration branch and salvage its cairn/ knowledge before it disappears.
• references/zh-glossary.md — writing project docs in Chinese (or resolving what a Chinese term should be); fixed English↔Chinese terminology mapping for Project Cairn's own vocabulary.

The description frontmatter describes triggering situations, not the workflow in detail.

Templates

assets/templates/ holds templates used by init and by later triggered actions: AGENTS.md, CLAUDE.md, config.yaml, LOG.md, ROADMAP.md, topic.md, Cited.md. init only scaffolds the core set (AGENTS.md, CLAUDE.md, .cairn/config.yaml, cairn/LOG.md, and optionally cairn/ROADMAP.md); topic.md, Cited.md, and Reference/ are created on first trigger, not pre-stamped. Templates use {{PLACEHOLDER}} tokens; never hardcode a specific provider or knowledge path into a template.

Boundaries

• No background hook and no chat-end trigger are assumed.
• Day-to-day maintenance happens because AGENTS.md is read as project rules.
• Audit is the safety net for missed records.
• Graduation is candidate detection plus human confirmation.
• Historical migration is optional and separate from init.
• Provider adapter scripts under scripts/*.sh are bash — verified on macOS/Linux; Windows users need WSL or Git Bash. scripts/*.py scripts only need a Python 3 interpreter, no shell required.