trusty-common

Shared utility surface for the trusty-* AI tooling ecosystem. This crate is the result of consolidating several formerly separate crates into one: trusty-mcp-core, trusty-rpc, trusty-embedder, and trusty-symgraph have all been absorbed here.

Each subsystem is feature-gated so consumers only pay for what they use.

Installation

[dependencies]
trusty-common = "0.3"

With optional features:

trusty-common = { version = "0.3", features = ["axum-server", "mcp", "rpc", "embedder"] }

Feature Flags

By default the crate is dependency-light: tokio, serde, reqwest, and tracing. Pull in only the features you need.

What's Included

Port Binding

bind_with_auto_port walks forward through ports when the requested one is busy, so daemon restarts don't fail noisily.

use trusty_common::bind_with_auto_port;

let addr = "127.0.0.1:7878".parse()?;
let listener = bind_with_auto_port(addr, 10).await?;
println!("listening on {}", listener.local_addr()?);

Data Directory

resolve_data_dir(app_name) resolves an OS-appropriate per-application directory (~/Library/Application Support/ on macOS, ~/.local/share/ on Linux) and creates it if missing.

use trusty_common::resolve_data_dir;

let dir = resolve_data_dir("trusty-search")?;
// ~/Library/Application Support/trusty-search  (macOS)
// ~/.local/share/trusty-search                  (Linux)

Daemon Address File

write_daemon_addr / read_daemon_addr persist and retrieve a running daemon's bound host:port so MCP clients and follow-up CLI invocations can find it without hardcoding a port.

Tracing / CLI Init

use trusty_common::init_tracing;

// 0=warn, 1=info, 2=debug, 3=trace; RUST_LOG overrides
init_tracing(1);

Logs always go to stderr — stdout stays clean for MCP JSON-RPC framing.

Chat Providers (OpenRouter + Ollama)

Provider-agnostic streaming chat via the ChatProvider trait. Supports OpenRouter and Ollama out of the box; auto-detects a local Ollama instance.

use trusty_common::{OpenRouterProvider, ChatProvider, ChatEvent};

let provider = OpenRouterProvider::new(api_key, "anthropic/claude-3.5-sonnet".into());
let messages = vec![/* ... */];
let mut stream = provider.chat_stream(messages, None).await?;
while let Some(event) = stream.next().await {
    // handle ChatEvent::Delta, ChatEvent::Done, ChatEvent::ToolCall
}

axum Middleware Stack (axum-server feature)

use trusty_common::server::with_standard_middleware;

let app = Router::new().route("/", get(handler));
let app = with_standard_middleware(app); // CORS + trace + gzip (SSE-safe)

Middleware order: CorsLayer → TraceLayer → CompressionLayer (gzip, text/event-stream excluded for SSE compatibility).

MCP / JSON-RPC Primitives (mcp feature)

Formerly the trusty-mcp-core crate. Provides the shared envelope types and a ready-made stdio dispatch loop for MCP servers.

use trusty_common::mcp::{Request, Response, initialize_response, run_stdio_loop};

// Build the initialize response for your server
let result = initialize_response("my-server", "0.1.0", None);

// Run a full JSON-RPC 2.0 stdio loop
run_stdio_loop(|req: Request| async move {
    // dispatch and return a Response
    Response::ok(req.id, serde_json::json!({"result": "ok"}))
}).await?;

Key exports: Request, Response, JsonRpcError, initialize_response, run_stdio_loop, error_codes.

RPC Client (rpc feature)

Formerly the library half of the trusty-rpc crate. General-purpose JSON-RPC 2.0 client with stdio-subprocess and HTTP transports.

use trusty_common::rpc::{RpcClient, StdioTransport};

let transport = StdioTransport::spawn("trusty-search", &["serve"])?;
let client = RpcClient::new(transport);
let result = client.call("search", serde_json::json!({"q": "fn auth"})).await?;

Embeddings (embedder feature)

Formerly the trusty-embedder crate. Text-embedding pipeline backed by fastembed-rs using the AllMiniLML6V2Q INT8 quantized model (384-dim, ~22 MB). LRU cache, ORT warmup, and CoreML acceleration on Apple Silicon are all included.

use trusty_common::embedder::FastEmbedder;

let embedder = FastEmbedder::new().await?;
let vecs = embedder.embed(&["fn authenticate", "user login"]).await?;
// vecs: Vec<Vec<f32>>, each inner Vec is 384-dim

• Model: AllMiniLML6V2Q (INT8 quantized, ~22 MB)
• Fallback: AllMiniLML6V2 (full-precision, ~86 MB) when quantized unavailable
• Output dimension: 384
• Acceleration: CoreML (Apple Silicon, auto-detected), CUDA (via embedder-cuda)

For tests, use MockEmbedder (requires the embedder-test-support feature):

use trusty_common::embedder::MockEmbedder;

let embedder = MockEmbedder::new(384); // deterministic zero vectors

Symbol Graph (symgraph / symgraph-parser features)

Formerly the trusty-symgraph crate. A tree-sitter–powered symbol graph engine for source-code analysis.

The symgraph feature exposes only the pure data contracts — no tree-sitter dependency, no links conflict:

use trusty_common::symgraph::{EntityType, EdgeKind, RawEntity};

The symgraph-parser feature adds the full parse → registry → emit stack (tree-sitter grammars for Rust, Python, JS/TS, Go, Java, C, C++):

use trusty_common::symgraph::{SymbolGraph, SymbolRegistry};

let graph = SymbolGraph::parse_file("src/main.rs")?;

Important: symgraph-parser brings in the links = "tree-sitter" native library slot. Enable it in at most one crate per build graph (typically open-mpm). Downstream crates that only need the data types enable symgraph (contracts only) and stop there.

Development

# Check the crate (no feature flags)
cargo check -p trusty-common

# Test all features
cargo test -p trusty-common --features axum-server,mcp,rpc,symgraph

# Test embedder (ONNX-backed tests are #[ignore] by default)
cargo test -p trusty-common --features embedder -- --include-ignored

License

Licensed under the Elastic License 2.0.

Repository

https://github.com/bobmatnyc/trusty-tools