v0.0.4

Hayvenhurst v0.0.4

The fastest way to keep an always-fresh, private structural index of your codebase — no model, no embeddings, no setup.

A pre-release (0.x): expect breaking changes in every 0.x until v1.0.

What Hayvenhurst is

Hayvenhurst builds and maintains a structural index of a codebase — entities, call/import edges, and runtime trace coverage — backed by SQLite, with zero embeddings, zero model, and zero external services. It runs anywhere a Rust binary and SQLite run, indexes in well under a second, and never sends your code anywhere. The advantage is speed + zero-config + determinism, not "smarter than grep."

The measured wedge (committed, reproducible harnesses)

Property	Hayvenhurst	Embedding-based indexer
Cold index (hono, 362 files)	0.65 s	35.6 s
Cold index (gin, Go)	0.23 s	—
Branch switch (re-parse only the diff)	~48 ms	re-syncs + re-embeds
Revisit a seen branch	1 ms (cached)	0.41 s
Dependencies	none	model + torch + vector store

Because the index is embedding-free, building it is a parse + a SQLite write — sub-second cold, instant on a cached branch, private by construction. We win on speed, freshness, and privacy — embeddings still beat us on fuzzy semantic recall.

Reproduce on any repo: bench/wedge-demo.sh <repo-url>.

What's new in 0.0.4

• Per-test runtime coverage + hayven affected-tests. A trace collector records, per test, the entities that test executed; affected-tests <symbol|--changed files> returns the tests for a change — useful as a fail-fast test ordering aid and as a precise "which tests actually exercise this symbol" query. The collector batches flushes, records coverage on every call (complete even at the default sample rate), and excludes nested helpers from being test contexts.
• Fail-fast test ordering (affected-tests --order, APFD-optimized) and fleet memory (hayven remember/recall, /api/memory) — durable, graph-keyed notes shared across agents and sessions.
• Branch-aware per-branch indexing matured — each branch caches its own index; a re-visit is a 1 ms read, never a re-embed.

Install

Build from source (bun install, cargo build --release), or install the Claude Code plugin and hayven init in any repo. Cross-platform tarballs are produced by the release workflow.

Reproduce the wedge in under a minute

export HAYVEN_NATIVE_BIN="$PWD/native/target/release/hayven-native"
git clone --depth 50 https://github.com/honojs/hono /tmp/hv-switch
bun bench/branch-switch-cost.ts /tmp/hv-switch 3

Full Changelog: https://github.com/Davidb3l/Hayvenhurst-dev/commits/v0.0.4