Claude Code Vault

claude-code-vault

A markdown knowledge base that Claude Code can search, read, and write — via MCP.

[](https://www.npmjs.com/package/claude-code-vault) [](https://github.com/bernabranco/claude-code-vault/actions/workflows/ci.yml) [](LICENSE) [](https://modelcontextprotocol.io)

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Claude Code is good at writing code but starts every session cold — no memory of decisions made, bugs already investigated, or patterns that matter in your repo. claude-code-vault gives it a persistent, searchable memory.

You write notes in plain markdown. The vault exposes them to Claude as 8 MCP tools — keyword search, semantic search, graph-aware context, and write-back. Claude finds relevant notes automatically rather than grepping files or asking you to repeat yourself.

> ⚠️ Status: early, active development. MIT-licensed, source you can read.

The self-docs vault as a graph — every wiki-link is an edge, every note a node.

Bootstrap in any repo

npx claude-code-vault init [project-name]

This creates:

• vault// — folder structure (adrs/, features/, gotchas/, research/) with a stub VAULT_SUMMARY.md
• .mcp.json — wires Claude Code to the vault's MCP server
• .gitignore entry for .vault-cache/ (local embeddings DB)

Restart Claude Code in the directory and the vault tools are available. Idempotent — safe to re-run.

What Claude can do with the vault

| Tool | What it does | |---|---| | vault_search | Keyword search across titles, tags, and body | | vault_semantic_search | Meaning-based search — finds relevant notes even with different wording | | vault_search_chunks | Returns the specific paragraph that answers the query, not the whole file | | vault_read | Full note content by ID | | vault_read_with_context | Note + ranked wiki-link neighbors in one round-trip | | vault_search_chunks_with_context | Chunk search + graph neighbors of the matched notes | | vault_list | List notes, optionally filtered by tag | | vault_related | 1-hop graph neighbors (backlinks + forward links) |

Search tools return a { results, truncated } envelope with a maxChars budget (default 8000 chars). The top result is always returned even if it alone exceeds the budget.

Embeddings run locally via @huggingface/transformers + sqlite-vec — no API key, no cloud. First startup downloads ~22 MB of model weights; subsequent runs only re-embed changed notes.

Write-back

Claude can add and update notes directly:

| Tool | What it does | |---|---| | vault_create_note | Create a new note with schema validation | | vault_write | Overwrite a note | | vault_append_section | Add content under a heading | | vault_replace_section | Replace content under a heading | | vault_lint | Run the linter and return findings |

Vault structure

vault/
└── /
    ├── VAULT_SUMMARY.md    ← Claude reads this first as the index
    ├── overview.md
    ├── adrs/               ← Architecture Decision Records
    ├── features/           ← feature specs
    ├── gotchas/            ← non-obvious traps
    └── research/           ← open questions, exploration

Notes use YAML frontmatter (title, tags, description, date, status, type). Wiki-links ([[other-note]]) form a graph that the *_with_context tools traverse. Notes with status: deprecated are excluded from retrieval; status: stale are downranked.

Hooks (optional)

Three Claude Code hooks ship with the package to reinforce vault use:

Vault-first reminder — on the first Grep or Glob per session, emits a one-time nudge to try vault_semantic_search first. Never blocks.

Subagent gate — blocks subagent spawns if no vault_* tool was called in the last 20 tool uses. Subagents start cold; vault context should come before them.

End-of-session gap report — if the session edited ≥ 3 files but called zero vault tools, prints a reminder to vault_create_note on the way out. Visible to you, not injected into the model.

Wire them in .claude/settings.json:

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Grep|Glob",
        "hooks": [{ "type": "command", "command": "node ${CLAUDE_PROJECT_DIR}/node_modules/claude-code-vault/hooks/vault-first-reminder.mjs" }]
      },
      {
        "matcher": "Agent|Task",
        "hooks": [{ "type": "command", "command": "node ${CLAUDE_PROJECT_DIR}/node_modules/claude-code-vault/hooks/vault-first-subagent.mjs" }]
      }
    ],
    "SessionEnd": [{ "hooks": [{ "type": "command", "command": "node ${CLAUDE_PROJECT_DIR}/node_modules/claude-code-vault/hooks/vault-gap-report.mjs" }] }]
  }
}

Disable all hooks with CLAUDE_VAULT_HOOK_DISABLE=1.

Web UI (optional)

Browse the vault in a browser — force-directed graph + note reader + lint panel.

npm install
node lib/server.js          # http://localhost:4001
cd web && npm run dev       # http://localhost:5173

Reader view — folder tree, rendered markdown, frontmatter on the right.

CLI

node index.js semantic-search "why SQLite over cloud DB" --limit 3
node index.js search-chunks "tab throttling" --limit 5
node index.js lint              # exits 1 on errors
node index.js index             # re-index vault

Roadmap

• [x] MCP server with 8 vault tools
• [x] Semantic search + chunk-level retrieval (local embeddings, no API key)
• [x] Graph-aware context (*_with_context tools)
• [x] claude-code-vault init bootstrap
• [x] Write-back tools (vault_write, vault_create_note, section edit)
• [x] Vault linter (vault_lint + CLI)
• [x] Hooks (vault-first reminder, subagent gate, gap report)
• [x] HyDE query expansion, status-aware retrieval, char budgets
• [x] Retrieval eval harness with CI gate
• [ ] Hybrid search (keyword + semantic via RRF)
• [ ] Reranker (cross-encoder pass over top-K)
• [ ] Federated search across multiple projects

Full tracker: #33.

Contributing

PRs welcome. See [CONTRIBUTING.md](CONTRIBUTING.md) for dev setup and workflow. All contributors agree to the [Code of Conduct](CODEOFCONDUCT.md).

License

[MIT](LICENSE)

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: bernabranco
• Source: bernabranco/claude-code-vault
• License: MIT

Install and usage instructions live in the source repository linked above.