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# Memento OS > Persistent AI memory using reasoning artifacts. Works with Claude Code, Codex, Cursor, Windsurf, Cline, Gemini, Aider, and Continue. ## What This Is Memento OS gives AI coding agents persistent, validated memory. It stores pre-computed reasoning outputs (decisions, insights, errors, seeds) with invalidation triggers — so the agent knows what was decided, why, and when to re-evaluate. ## Core Concept: Reasoning Artifacts Four types of artifacts, each with an expiration condition: - [D] Decision — a choice between alternatives. Format: `[D] conclusion — invalidates if trigger [priority] [date]` - [I] Insight — a reusable conclusion from research/experience - [E] Error — a mistake with root cause analysis - [S] Seed — a forward-looking idea with activation trigger (surfaces when conditions are met) Priority matrix: confidence (high/medium/low) x impact (high/low) → critical/volatile/settled/noise ## Plugin Components Skills (5): memento:decide, memento:grill-me, memento:session-start, memento:session-complete, memento:vault-audit Commands (2): memento:init, memento:stats Hooks (2): Stop (auto-capture), PreCompact (save before compression) ## Install ``` /plugin install memento-os /memento:init ``` ## Multi-Tool Support - Claude Code: Full plugin (skills, hooks, commands) - Codex (OpenAI): Full skills via adapters/codex/ - Cursor, Windsurf, Cline, Gemini: Rules-based adapters - Aider, Continue: Manual integration via config ## Key Files - README.md — full documentation - skills/*/SKILL.md — skill implementations (Claude Code) - commands/memento/*.md — command implementations - hooks/hooks.json — hook definitions - adapters/*/README.md — per-tool install guides - evolution/*.md — case studies of problems solved ## Links - Repository: https://github.com/ayalnogovitsyn/memento-os - License: MIT