# Vault Context

> **TL;DR.** Vault Context is the practice of feeding a local Markdown vault — its files, folder layout, frontmatter, tags, and retrieved chunks — to an LLM so the model answers grounded in your own notes instead of generic web knowledge.

- **Category:** AI / Developer Tools / Knowledge Management
- **Stage:** rising
- **Age:** 125 days
- **Origin date:** 2026-02-11
- **First detected:** 2026-04-20
- **Canonical URL:** https://earlyterms.com/term/vault-context
- **Sources:** 7 primary URLs

## Definition

Vault Context is the practice of feeding a local Markdown vault — its files, folder layout, frontmatter, tags, and retrieved chunks — to an LLM so the model answers grounded in your own notes instead of generic web knowledge. The "vault" is Obsidian-style: a plain directory of `.md` files on disk.

The phrase crystallized in Q1 2026: the Obsidian [Promptfire](https://forum.obsidian.md/t/new-plugin-promptfire-copy-your-vaults-context-to-any-llm-with-one-hotkey/111088) plugin (Feb 11), the mcpvault MCP server (1.1k stars) wiring vaults to Claude and ChatGPT, Logan Yang's Obsidian Copilot at 6.7k stars, and Apr 20's [CyberWriter](https://news.ycombinator.com/item?id=47833747) Show HN, all pivoting around Apple's macOS 26 Foundation Models and NLContextualEmbedding APIs — which finally made on-device vault RAG free per query.

## Example

CyberWriter indexes your Markdown folder with Apple's NLContextualEmbedding (512-dim, ~50s per 1,000 chunks on M1), then stuffs the top-5 retrieved chunks into a 3K-char budget for Foundation Models — so asking "what did I say about orbital mechanics?" pulls your own rocket-launch notes even when those exact words never appear in them.

## Analogy

Like giving the LLM the keys to your filing cabinet instead of reading the whole thing aloud every morning.

## Why it's emerging now

Three things collided in Q1 2026: Apple shipped Foundation Models + NLContextualEmbedding as free on-device APIs in macOS 26, MCP normalized how AI clients read local files, and Obsidian's plugin ecosystem decided the vault IS the context. The phrase stops being one editor's feature name and starts being a category.

## Related terms

- *parent:* context engineering
- *related:* model context protocol
- *related:* context window
- *related:* personal AI
- *related:* LLM wiki
- *related:* AI workspace
- *parent:* retrieval-augmented generation
- *competitor:* Obsidian Copilot
- *related:* second brain
- *related:* personal knowledge graph
- *related:* local-first AI

## Sources

1. [Promptfire — Copy your vault's context to any LLM (Obsidian Forum)](https://forum.obsidian.md/t/new-plugin-promptfire-copy-your-vaults-context-to-any-llm-with-one-hotkey/111088)
2. [Show HN: CyberWriter — .md editor on Apple on-device AI](https://news.ycombinator.com/item?id=47833747)
3. [Obsidian Copilot — THE Copilot in Obsidian](https://github.com/logancyang/obsidian-copilot)
4. [mcpvault — MCP server for Obsidian vault access](https://github.com/bitbonsai/mcpvault)
5. [ObsidianRAG — LangGraph + local LLM query over vault](https://github.com/Vasallo94/ObsidianRAG)
6. [Vault LLM Assistant plugin listing](https://www.obsidianstats.com/plugins/vault-llm-assistant)
7. [ChatGPT MD: The AI Assistant Your Obsidian Vault Needs](https://www.blog.brightcoding.dev/2026/03/25/chatgpt-md-the-ai-assistant-your-obsidian-vault-needs)

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_Generated by EarlyTerms · https://earlyterms.com/term/vault-context_