ragnarok

ragnarok

Local RAG search over Obsidian vaults for Claude Code.

ragnarok indexes the Markdown notes of one or more Obsidian vaults on your computer. A local MCP server gives Claude Code search tools over the index. No note leaves the computer: the embeddings come from a local Ollama model, and the index is one SQLite file.

Features

• Hybrid search. Each query runs a dense search (embeddings in sqlite-vec) and a keyword search (SQLite FTS5 with BM25). Reciprocal rank fusion joins the two lists. The unit of rank is the note, with its best section.
• Heading chunks. The splitter cuts each note at its headings and joins very short sections.
• Metadata from frontmatter or path. Each note gets a vault, a project, an area, a type, a status and ticket keys. The frontmatter gives these values first. For a note without them, path rules in the configuration give them.
• Project search. find_projects finds the earlier projects that a prompt continues or resembles, also when the prompt does not name the project. list_project gives all notes of a project.
• Always current. Each tool call first scans the vaults for changed notes (usually less than 100 ms) and embeds them. There is no watcher process.
• Private notes. Notes under the configured private paths are in the index, but the server does not return them. Only the user can open them, with allow_private = true in the configuration.
• Credential redaction. The indexer and open_note replace literal passwords, tokens and keys with [REDACTED]. The vault files do not change.
• Frontmatter backfill. ragnarok backfill propose writes a proposal of the missing frontmatter keys for a vault. ragnarok backfill export writes a JSON file with the title and the first lines of each public note that needs a description (credentials removed). Claude writes the descriptions into one or more JSON files, {path: {"description": "...", "type": "..."}}. ragnarok backfill merge ... puts them into the proposal, removes credentials, reports each description of more than 25 words and each row with no description, and replaces a default type with a valid type from Claude. You examine the proposal, then ragnarok backfill apply makes a backup archive of the vault and adds only the missing keys.
• Evaluation. ragnarok eval compares grep, keyword, dense and hybrid search on your own question sets. ragnarok eval agent compares a Claude Code agent with grep and an agent with the MCP tools.
• One-command setup. ragnarok init installs the model and the index, and registers the MCP server in Claude Code when the Claude Code plugin does not give it. ragnarok doctor checks the setup.

Requirements

• macOS with Homebrew. The setup uses brew services for Ollama.
• Ollama: brew install ollama.
• Claude Code.
• uv: brew install uv. uv installs Python 3.12. setup.sh installs uv if it is missing.

Setup

ragnarok is on PyPI as ragnarok-mcp and in the MCP Registry as io.github.freyr/ragnarok.

With the Claude Code plugin (no clone)

In Claude Code:

/plugin marketplace add freyr/ragnarok-claude-plugin

/plugin install ragnarok@ragnarok

Then in a terminal:

uvx ragnarok-mcp init

The plugin starts the server with uvx ragnarok-mcp serve and adds the search guidance to each session. The home folder is ~/.ragnarok. To use a different folder, set RAGNAROK_HOME in the env of ~/.claude/settings.json and in your shell.

From a checkout

git clone https://github.com/freyr/ragnarok.git

cd ragnarok ./setup.sh # installs uv if needed, then runs ragnarok init

The checkout is the home folder.

What init does

ragnarok init does six steps. It skips each step that is already done:

1. It writes config.toml from config.example.toml. It asks for the vault root, the folder that holds your vault folders, and adds each subfolder as a vault.
2. It checks that Ollama is installed.
3. It runs Ollama as a login service with brew services start ollama (it asks first). If Ollama runs outside brew services, for example ollama serve in a terminal, init stops it and starts the service.
4. It pulls the embedding model.
5. It builds the index. A vault with 1,500 notes takes approximately 12 minutes on an Apple Silicon Mac.
6. When the plugin ragnarok gives the MCP server, it removes a registration at the user scope (it asks first). Else it registers the MCP server ragnarok in Claude Code at the user scope (it asks before it replaces another registration).

Restart Claude Code after step 6. ragnarok doctor checks the same six parts and prints the fix for each failure.

Before step 5, examine config.toml: remove a folder that is not a vault, and add your private paths. A later change of the configuration applies at the next ragnarok index or MCP tool call, with no restart.

Use in Claude Code

The server gives six tools:

The plugin adds the guidance below to each session itself, with the plugin tool names mcp__plugin_ragnarok_ragnarok__*. Without the plugin, Claude Code loads MCP tools on demand. To make Claude use them before grep, add a short instruction to your ~/.claude/CLAUDE.md file, for example:

## Finding notes: ragnarok first

The ragnarok MCP server indexes my Obsidian vaults. Use it before Grep or Glob whenever you look for notes, earlier work or context:

• find_projects: the prompt continues or resembles earlier work and names no project. Then call list_project on the best match (look at the top 3).
• search: facts, decisions, how something was done. Filters: vault, project, area, type.
• open_note: read a note or one section, with its links and backlinks. A long note gives its outline first; open the section you need by heading.
• open_projects: which projects are in progress or paused.
• find_by_jira: a ticket key such as OPS-77.

The tools are deferred. Load them in one call before the first use: ToolSearch with select:mcp__ragnarok__search,mcp__ragnarok__find_projects,mcp__ragnarok__list_project,mcp__ragnarok__open_projects,mcp__ragnarok__open_note,mcp__ragnarok__find_by_jira.

If the tools are absent (for example on a computer without ragnarok), fall back to Grep and say so. Results can be unrelated: read the text before you rely on it, and cite note paths. Private notes are refused by design; do not work around the refusal with Read or Grep.

Adapting to your vaults

docs/vault-requirements.md tells how a vault must look to get the most from ragnarok: headings, project folders, SUMMARY.md, frontmatter and private folders.

The default path rules expect / / /note.md. If your vaults look different, the repo skill .claude/skills/adapt-vault/ guides Claude Code through the changes. Open Claude Code in the checkout and ask it to adapt ragnarok to your vaults. The skill:

1. runs ragnarok survey on each vault;
2. agrees the private folders with you, before any other change and before a new vault goes into vaults;
3. writes the path rules into config.toml, checked with ragnarok inspect;
4. runs the frontmatter backfill, if you agree, with your review before apply;
5. writes a small evaluation set from your notes and runs ragnarok eval mechanical;
6. adds the guidance above to your ~/.claude/CLAUDE.md, after it asks you.

It changes only config.toml and adds frontmatter keys. It never moves, renames or deletes a note or a folder.

Configuration

config.toml is in the home folder. A relative path in it is relative to the home folder. config.example.toml explains each key. The most important keys:

Note metadata

ragnarok reads these frontmatter keys. Each key is optional:

---

project: heating-upgrade # the project slug; default: from the path rules area: home # a wide subject; default: from the path rules type: plan # drivers, summary, research, spec, plan, brainstorm, review, decision,

guide, reference, meeting, log, template or note

status: active # active or archived; a note in an _archive folder, or in a project

whose SUMMARY.md has state: superseded or abandoned, is archived; state: done is current

description: One sentence about the note, which improves find_projects. jira: [ABC-123] # ticket keys, in addition to the keys in the text

Without frontmatter, the path rules give the metadata. The default rules work for a vault with the layout / / /note.md. For a different layout, add a [vault_rules. ] table. Use ragnarok inspect to see the metadata of a note.

Commands

| ragnarok survey [--json] | Prints the folders, frontmatter keys, marker files, name patterns and ticket prefixes of a vault folder. Run it before