🍄 Mycelium v0.1.0 / v0.1.1 — first public release + crates.io

[aimasteracc]

🍄 Mycelium v0.1.0/v0.1.1 is now public + on crates.io.

I built Mycelium because every "AI + codebase" tool I tried was just ripgrep with extra ceremony. When my agent asked "what calls get_user?" it would do 6 round trips of glob → read → guess → regrep. Mycelium replaces that with an actual symbol graph the agent can query in one shot.

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What it is

A reactive code-intelligence graph for AI agents, written in Rust. Three layers:

• Trunk — Materialized Path Radix Trie for containment (~8 ns lookups)
• Synapse — per-EdgeKind adjacency lists (calls, imports, inherits, ...) — ~392 ns for 3-hop traversal
• Cortex — Salsa-3 incremental layer so re-queries after a file edit are memoized, not recomputed

On top sits Hyphae, a CSS-selector-style DSL. function:calls(get_user):in(auth/*) is one query, not six MCP calls. Measured at ≤ 30% of the equivalent raw-JSON MCP token count.

10 language packs ship out of the box: JS, TS, Python, Rust, Go, Java, C, C++, C#, Ruby. Adding a new language is a 3-file PR under packs/<lang>/. The core never changes.

Try it

cargo install mycelium-rcig-cli
mycelium index ./my-project
mycelium serve --mcp --root ./my-project

(The mycelium-rcig-* prefix on crates.io is because mycelium-core was squatted in 2019 and mycelium-cli belongs to an active bioinformatics project. The installed binary is still mycelium — rcig = reactive code intelligence graph.)

Engineering bar

• 835 tests passing, 96.27% line coverage
• All Charter §2 SLAs satisfied
• 100% pub items have rustdoc
• CI fast lane: fmt + clippy + unit < 5 min

What I'd love feedback on

• Hyphae DSL ergonomics — is the query shape intuitive when you're writing prompts for your agent? Is something missing? (RFC-0003)
• Pack quality for languages I don't use daily (Java / C# / Ruby especially). Bugs and missing edges welcome.
• What's the v0.2 thing you'd want most? Cross-repo graphs, persistent agent subscriptions, IDE plugins, or something else entirely?

Releases

• v0.1.0 — first public release
• v0.1.1 — crates.io publish

Issues and PRs are open. ⭐ if it helps you.