Fast, hybrid (BM25 + semantic) local code search for AI agents and humans, written in pure Rust.

Veles runs entirely on CPU — no GPU, no transformer forward pass at query time. Queries return in tens of milliseconds against a persistent on-disk index, with tree-sitter-aware symbol lookups, pipe-friendly output formats, and built-in MCP / gRPC servers for integration with Claude, Cursor, or anything else that speaks JSON-RPC. Static embeddings come from the potion family via model2vec-rs.

Originally inspired by Semble — Veles started as a Rust port of the same hybrid retrieval recipe and has grown to add persistent + incremental indexing, tree-sitter symbols / defs / refs, six pipe-friendly output formats, glob/language filters, gRPC, and shell completions.

_{veles tui — live hybrid search, ~10ms per keystroke.}

Interfaces

• CLI — veles search "query" ./my-repo
• MCP server — stdio JSON-RPC for AI agent integration (Claude, Cursor, etc.)
• gRPC — tonic-based service with Index, Search, FindRelated, GetStats RPCs

Features

• Persistent index under <repo>/.veles/ — searches reuse the cache and finish in tens of milliseconds. Incremental update keeps embeddings of unchanged files.
• Hybrid search with Reciprocal Rank Fusion (RRF) blending BM25 and semantic scores
• Tree-sitter symbol commands — symbols / defs / refs for Rust, Python, JavaScript, TypeScript, Go
• Identifier-aware tokenizer — splits camelCase, snake_case, and mixed-script names
• Query-type detection — symbol queries lean BM25, natural language leans semantic
• Definition boosting — promotes chunks that define the queried symbol
• Path penalties — demotes test files, compat dirs, re-export files
• File saturation — avoids stacking all results from one file
• Scope labels on every hit — search/related/refs results carry a tree-sitter-derived defines `Foo` or in `bar` suffix so the result header alone tells you what each chunk is
• Multilingual model option for Cyrillic, CJK, Arabic, etc.
• Pipe-friendly output — pretty, compact, ripgrep, paths, json, jsonl
• Filter flags — --lang, --path and --exclude glob patterns, --min-score
• Prebuilt binaries for macOS (Intel/ARM), Linux x86_64/ARM64 (musl), Windows x86_64

Install

# Linux / macOS — prebuilt binary (one-liner)
curl --proto '=https' --tlsv1.2 -LsSf \
  https://github.com/julymetodiev/Veles/releases/latest/download/veles-cli-installer.sh | sh

# Windows — PowerShell
irm https://github.com/julymetodiev/Veles/releases/latest/download/veles-cli-installer.ps1 | iex

# Homebrew (macOS / Linux)
brew install julymetodiev/tap/veles-cli

# From crates.io (compiles locally; no protoc / extra deps needed)
cargo install veles-cli

# Manual download
gh release download --repo julymetodiev/Veles --pattern '*linux-gnu*'   # or browse
#   https://github.com/julymetodiev/Veles/releases/latest

# Verify (optional)
veles --version    # → veles 0.4.3

See INSTALL.md for SHA-256 verification and other install paths.

Quickstart

veles index .                     # one-off, builds .veles/
veles search "parse config file"  # auto-loads the cache
veles update .                    # refresh after edits

The first search downloads the embedding model from Hugging Face (~64 MB, cached at ~/.cache/huggingface/hub/).

Most-used commands

Search

veles search "rate limiting"                          # hybrid (default)
veles search "rate limiting" -t 10 -f compact         # 10 results, 1 line each
veles search "rate limiting" -f rg                    # ripgrep-style path:line:content
veles search "rate limiting" -f json | jq '.results'  # structured for scripting
veles search "rate limiting" -f paths | xargs $EDITOR # open every matching file

veles search "TokenStream" -m bm25                    # exact identifier
veles search "auth flow"    -m semantic               # fuzzy concept
veles search "auth"  -l rust,python                   # language filter
veles search "X"     -g 'src/**/*.rs' -x 'src/legacy/**'   # glob include / exclude
veles search "BM25"  --min-score 0.4                  # drop weak hits

Symbols (tree-sitter)

veles symbols crates/veles-core/src/persist.rs        # outline a single file
veles defs Manifest                                   # every definition named "Manifest"
veles defs save -k function -l rust                   # filter by kind + language
veles refs save_index -t 30                           # defs + BM25 references

Related code

veles find-related src/main.rs 42                     # semantically similar chunks
veles find-related src/main.rs 42  -l rust            # restrict to one language
veles find-related src/main.rs 42  -g 'crates/foo/**' # restrict to a subtree

Index lifecycle

veles index .              # bootstrap
veles index . --force      # rebuild from scratch
veles update .             # incremental refresh
veles status .             # manifest + drift
veles clean .              # remove .veles/

Interactive TUI

veles tui                          # live hybrid search with preview pane
veles tui ./my-repo                # against another repo

Loads the persistent index once, then debounces queries so each keystroke re-runs in tens of milliseconds. ↑↓ navigate, Tab cycles hybrid/bm25/semantic, Ctrl-R finds related code, Ctrl-D / Ctrl-F show tree-sitter definitions / references for the typed identifier, Enter prints path:line to stdout ($EDITOR $(veles tui) works), Ctrl-O opens in $EDITOR, ? shows the full keybinding overlay.

Servers

veles serve-mcp                                # MCP over stdio (default if no args)
veles serve-grpc --addr "[::1]:50051"          # gRPC

Shell integration

mkdir -p ~/.zfunc ~/.local/share/man/man1
veles completions zsh > ~/.zfunc/_veles
veles man --out-dir ~/.local/share/man/man1

veles man --out-dir DIR writes one page per subcommand (veles.1, veles-search.1, veles-defs.1, …) so man veles-search works the same way as man git-commit.

Then once in ~/.zshrc:

fpath=(~/.zfunc $fpath)
autoload -Uz compinit && compinit
export MANPATH="$HOME/.local/share/man:$MANPATH"

Remote repos

veles search "BM25 inverted index" https://github.com/julymetodiev/Veles

See USAGE.md for the full reference, recipes (fzf, vim quickfix, jq), and troubleshooting.

MCP server

veles serve-mcp     # explicit
veles               # equivalent — bare `veles` starts MCP when stdin is piped

Exposed tools:

search, find_related, and refs accept a format argument:

• default (default) — scored, fenced code blocks tagged with the enclosing scope.
• paths — flat per-line list. search / find_related emit path:start-end; refs emits path:line per word-boundary occurrence of the symbol.
• unique_paths — collapsed to one path line per file. For agent shortlist workflows that just want "which files matter".

Build from source

cargo build --release

tonic-build ships a vendored protoc via protoc-bin-vendored, so no system-wide protobuf compiler is required.

Embedding in your own Rust project

The workspace publishes four crates on crates.io — pick the layer you need:

Full API docs are on docs.rs.

[dependencies]
veles-core = "0.2"

use std::path::Path;
use veles_core::{SearchMode, VelesIndex};

let index = VelesIndex::from_path(Path::new("."), None, None, false)?;
let results = index.search("parse config", 5, SearchMode::Hybrid, None, None, None);
for r in results {
    println!("{} [{:.3}]", r.chunk.location(), r.score);
}
# Ok::<(), anyhow::Error>(())

Architecture

Veles/
  crates/
    veles-core/    indexing, chunking, BM25, dense search, ranking, symbols
    veles-grpc/    gRPC service (tonic + prost)
      proto/
        veles.proto  gRPC schema
    veles-mcp/     MCP server over stdio
    veles-cli/     CLI binary

The persistent index lives under <repo>/.veles/:

.veles/
  manifest.json   # model, dim, per-file (size, mtime, chunk_count)
  chunks.bin      # bincode Vec<Chunk>
  bm25.bin        # bincode BM25 inverted index
  dense.bin       # bincode dense matrix
  symbols.bin     # bincode tree-sitter symbols

update reuses embeddings of files whose (size, mtime) fingerprint hasn't changed, so refreshing after a small edit is near-instant on large repos.

License

MIT