vaultspec-rag 0.2.4

GPU-accelerated RAG module for vaultspec vault search

vaultspec-rag

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Semantic search for your vaultspec vault and project codebase

vaultspec-rag adds GPU-accelerated search to projects managed by vaultspec-core. It indexes your .vault/ documents -- research notes, architecture decisions, plans, execution logs -- alongside your source code. Query both with natural language so your AI tools find relevant context on their own.

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Getting started

Prerequisites

• Python 3.13 or later
• uv
• A CUDA GPU with at least 3 GB VRAM (mandatory -- no CPU fallback)
• vaultspec-core

Install

uv add vaultspec-rag
uv run vaultspec-rag install

The first command pulls in vaultspec-core and all GPU dependencies. The second seeds vaultspec-rag's bundled rule/MCP files into the workspace and patches your pyproject.toml with the cu130 torch index so uv resolves the CUDA torch wheel on Linux and Windows (macOS is left on PyPI torch). You'll be prompted before the pyproject.toml edit; pass --yes to skip the prompt (required in non-TTY contexts) or --no-torch-config to opt out. Add --sync to run uv sync --reinstall-package torch automatically after the patch.

Flag precedence: --no-torch-config always wins (the patch is not applied regardless of --force / --yes). --force is the user's blanket opt-in — it implies --yes for the torch-config prompt. On a non-TTY without --yes or --force, the patch is skipped with a warning and the command exits non-zero (code 2) so CI fails loudly. The default for the interactive prompt is no: hitting Enter without typing declines.

After install, run vaultspec-rag --version and then vaultspec-rag index as usual.

Manual cu130 configuration

If you'd rather configure the cu130 torch index by hand (air-gapped environments, custom resolvers), add the following to your pyproject.toml. These bytes are byte-equal to what vaultspec-rag install writes and what the CPU-only error message displays, so all three surfaces stay in lockstep:

[[tool.uv.index]]
name = "pytorch-cu130"
url = "https://download.pytorch.org/whl/cu130"
explicit = true

[tool.uv.sources]
torch = [{ index = "pytorch-cu130", marker = "sys_platform == 'linux' or sys_platform == 'win32'" }]

# uv ignores [tool.uv.sources] for purely-transitive deps.
# Add torch as a direct dep too, e.g. in [project].dependencies
# or [dependency-groups].dev:  "torch>=2.4"

The trailing comment is significant: uv silently ignores [tool.uv.sources] entries for purely-transitive packages, so the source pin only takes effect once torch appears in your own dependency lists. Add it to either [project].dependencies or [dependency-groups].dev:

[dependency-groups]
dev = [
    "torch>=2.4",
]

Then run uv lock --refresh-package torch && uv sync. The lockfile entry for torch should show source = { registry = "https://download.pytorch.org/whl/cu130" } (not pypi.org/simple); if it still resolves from PyPI, the direct-dep step was missed. [tool.uv.sources] declarations in a dependency's own pyproject.toml do not propagate to consumers, which is why this step is necessary.

Troubleshooting: "PyTorch was installed without CUDA support"

If vaultspec-rag index reports the CPU-only wheel on a machine with a GPU, uv resolved torch from PyPI (which only ships CPU wheels on Linux/Windows). There are three failure modes that all surface the same error; check them in order:

• Patch isn't applied. Run vaultspec-rag install (or paste the manual snippet above), then uv sync --reinstall-package torch.
• Patch is applied but torch is not a direct dep. uv ignores [tool.uv.sources] for purely-transitive packages, so the cu130 pin is a no-op until you add torch>=2.4 to [project].dependencies or [dependency-groups].dev (see the Manual section above). After adding it, run uv lock --refresh-package torch && uv sync.
• Patch is applied, torch is a direct dep, but resolution still picks the cpu wheel. Your uv.lock is stale. Run uv lock --refresh-package torch && uv sync to force a re-resolve. Inspect uv.lock afterwards: the torch entry should read source = { registry = "https://download.pytorch.org/whl/cu130" }.

The No CUDA GPU detected error is reserved for the genuinely GPU-less case (driver missing, headless VM without a device, etc.).

Verify

vaultspec-rag --version

Index and search

vaultspec-rag indexes two sources: vault (.vault/ documents) and code (project source files).

vaultspec-rag index                          # both
vaultspec-rag index --type vault             # vault only
vaultspec-rag index --type code              # code only

vaultspec-rag search "architecture decision"
vaultspec-rag search --type code "error handling"

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Using the MCP server

The Model Context Protocol (MCP) server gives AI assistants direct access to vault and codebase search. It runs in two transport modes with different project-resolution rules.

stdio mode -- one process per project. The MCP client launches vaultspec-search-mcp as a subprocess, scoped to a single workspace via VAULTSPEC_RAG_ROOT. Use this for Claude Desktop, Claude Code, and similar single-project AI tools.

{
  "mcpServers": {
    "vaultspec-rag": {
      "command": "vaultspec-search-mcp",
      "env": {
        "VAULTSPEC_RAG_ROOT": "/path/to/your/project"
      }
    }
  }
}

HTTP mode -- one daemon, many projects. Start vaultspec-rag server service start as a background daemon, then connect any MCP client to http://127.0.0.1:8766/mcp. The daemon has no default project; every tool call must include project_root. Use this to share one GPU-loaded service across workspaces.

See the MCP integration reference for the full tool list, both modes' contracts, and choosing between them.

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Further reading

Guide	What it covers
Usage modes	Ad-hoc vs. service operation
CLI commands	Command tree, flags, --port fast path
Configuration	Precedence, environment variables, .vaultragignore
Service management	Background daemon, health endpoint, model warmup
Python API	Facade functions for programmatic use
Architecture overview	Access layers, GPU lifecycle, multi-project support
Models	Embedding stack and model cards

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Getting help

Open an issue on GitHub.

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Contributing and license

Contributions welcome -- bug reports, feature ideas, or pull requests. vaultspec-rag uses the MIT License.