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# autograph > autograph is a schema-as-code memory engine for Obsidian vaults that AI agents write to > (Claude Code, Codex, OpenClaw, Hermes, and more via skills.sh). One schema.json defines > card types, folders, statuses, and decay rates; the engine enforces placement, repairs > wiki-links, merges duplicate entities, updates cards in place instead of duplicating them, > applies Ebbinghaus-style memory decay, and scores vault health. Memory is plain Markdown > you own — no hosted database, no API, no vendor lock-in. Key facts: Python 3.11+ stdlib only (zero external dependencies), 280 self-contained tests, MIT license. Works on any existing vault with no hardcoded domains. Install with `npx skills add smixs/autograph` or the Claude Code plugin marketplace. Category: AI agent memory, knowledge graph, personal knowledge management (PKM), Obsidian, Claude Code skill, schema-as-code, Ebbinghaus memory decay, entity deduplication. Comparison anchors: mem0, Letta (MemGPT), basic-memory, Zep/Graphiti. ## Docs - [README](https://raw.githubusercontent.com/smixs/autograph/main/README.md): install, quickstart, use cases, comparison, FAQ - [SKILL.md](https://raw.githubusercontent.com/smixs/autograph/main/skills/autograph/SKILL.md): agent workflows — bootstrap, health, create/update (dedup-first, supersede), search, orchestrate, daily→cards - [bootstrap-workflow](https://raw.githubusercontent.com/smixs/autograph/main/skills/autograph/references/bootstrap-workflow.md): the 10-phase vault bootstrap - [update-in-place](https://raw.githubusercontent.com/smixs/autograph/main/skills/autograph/references/update-in-place.md): ADD / UPDATE / SUPERSEDE / NOOP contract, Compiled Truth + append-only History - [schema-reference](https://raw.githubusercontent.com/smixs/autograph/main/skills/autograph/references/schema-reference.md): every schema.json field ## Optional - [Russian README](https://raw.githubusercontent.com/smixs/autograph/main/README.ru.md) - [daily processor](https://raw.githubusercontent.com/smixs/autograph/main/skills/autograph/references/daily-processor.md): turn a day's notes into linked cards