mcp-local-rag

What it does

Easy-to-setup local RAG server with minimal configuration

Description as published by the publisher in the official MCP Registry, read 10 Oct 2026. Not written or verified by Few Servers.

Facts

Install

• npm package, as published: mcp-local-rag · version 0.21.3 · transport stdio

  npx -y mcp-local-rag

  Standard run command for npm packages. The registry publishes the package name, not a command; check the repository for required arguments.

Install details read from the registry record on 12 Oct 2026. We have not run this server.

Keys and settings

The registry record declares settings, none marked secret. Declared by the publisher:

• BASE_DIR (environment variable, not marked required): Base directory for document storage (defaults to current working directory). Ignored when BASE_DIRS is set.
• BASE_DIRS (environment variable, not marked required): JSON array of base directories (e.g. '["/a","/b"]'). Takes precedence over BASE_DIR.
• DB_PATH (environment variable, not marked required): Path to LanceDB database directory (defaults to ./lancedb/)
• CACHE_DIR (environment variable, not marked required): Directory where Transformers.js models are cached (defaults to ./models/)
• HF_ENDPOINT (environment variable, not marked required): Hugging Face model download endpoint. Set this to a mirror URL when direct downloads are blocked (defaults to https://huggingface.co).
• MODEL_NAME (environment variable, not marked required): Embedding model name (defaults to Xenova/all-MiniLM-L6-v2)
• MAX_FILE_SIZE (environment variable, not marked required): Maximum file size in bytes (defaults to 104857600 / 100MB)
• RAG_MAX_DISTANCE (environment variable, not marked required): Maximum distance threshold for filtering search results. Results with distance greater than this value will be excluded. Lower values mean stricter filtering (e
• RAG_GROUPING (environment variable, not marked required): Grouping mode for quality filtering. 'similar' returns only the most similar group (stops at first distance jump). 'related' includes related groups (stops at s
• RAG_MAX_FILES (environment variable, not marked required): Maximum number of files to keep in search results. Results are filtered to include only chunks from the top N best-scoring files. For example, 1 returns only th
• CHUNK_MIN_LENGTH (environment variable, not marked required): Minimum chunk length in characters (1-10000, defaults to 50). Chunks shorter than this threshold are filtered out during ingestion.
• STORE_IMAGES (environment variable, not marked required): Store supported PDF and DOCX images during ingestion and return them with matched chunks (defaults to false).
• EMBED_TITLE_PREFIX (environment variable, not marked required): Embed each chunk together with its document title, which can help when passages don't restate the topic the title names (defaults to false). After changing it,
• EMBED_HEADING_PREFIX (environment variable, not marked required): Add section headings to chunk embeddings when they fit (defaults to false). Independent of EMBED_TITLE_PREFIX. Re-ingest documents after changing it.
• RAG_DEVICE (environment variable, not marked required): Execution device for the embedder (defaults to cpu). Passed straight to ONNX Runtime; see the Transformers.js device source for the supported backend names. If
• RAG_DTYPE (environment variable, not marked required): Embedding quantization dtype for the embedder (defaults to fp32). Opt-in and pass-through; accepts any dtype the chosen model provides (fp32, fp16, q8, int8, ..
• RAG_HYBRID_WEIGHT (environment variable, not marked required): Keyword boost factor for hybrid search (0.0-1.0, defaults to 0.6). 0 means semantic similarity only; higher values increase the keyword-match contribution to th
• RAG_RERANK_CMD (environment variable, not marked required): External reranker command template. Use {query} and {top} for query text and result count; unset disables reranking.
• RAG_RERANK_TIMEOUT_MS (environment variable, not marked required): Time budget per rerank call in milliseconds (100-600000, defaults to 10000). On timeout the spawned command is killed and the pre-rerank ordering is returned.

Links

RepositoryRegistry record (JSON)npm package

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