ahmadshady747-create/LOCUS

Sovereign Ambient HUD & Invariant-Verified Microkernel IDE in Pure Rust - ahmadshady747-create/LOCUS

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README

locus-engine 🦀⚡

Deterministic AST Safety Guard, Polyglot Semantic Symbol Graph, Surgical Byte-Span Patching, and Zero-Dependency Model Context Protocol (MCP) Server in Pure Rust.

⚡ Overview & Vision Modern AI code generation agents (Claude Code, Cursor, Copilot, Devin) and automated developer pipelines face two systemic engineering bottlenecks:

Probabilistic Syntax & Concurrency Regressions: AI agents frequently hallucinate unclosed delimiters, panic-inducing .unwrap() traps, async-mutex thread deadlocks, catastrophic polynomial regular expressions (ReDoS), and unbounded array indexing. Context Window Inflation: Repeatedly feeding entire source code files into LLM context windows wastes up to 80% of token budgets on repetitive function bodies rather than high-level interface contracts.

locus-engine solves both challenges as a standalone, zero-bloat, high-performance systems engine written in 100% safe Rust. It enforces deterministic, non-negotiable safety invariants in microsecond time (9.04 µs), extracts cross-file symbol graphs with minimal context footprints, and communicates natively with modern AI IDEs via the Model Context Protocol (MCP).

📺 Live Terminal Verification Demo $ locus check src/async_task.rs

+-------------------------------------------------------------+ | LOCUS AST GUARD VERIFICATION | +-------------------------------------------------------------+ Target File: src/async_task.rs Verified Latency: 0.0194 ms Status: [FAIL] Invariant Violation Detected Violation Kind: ASYNC_MUTEX_DEADLOCK Violation Detail: std::sync::Mutex used in async context with .await — use tokio::sync::Mutex instead. +-------------------------------------------------------------+

$ locus graph src/

+-------------------------------------------------------------+ | LOCUS SYMBOL GRAPH INDEX | +-------------------------------------------------------------+ Indexed Root: src/ Total Indexed Files: 8 Extracted AST Symbols: 28 Token Savings via AST Skeleton: 74.8% Indexing Latency: 4.82 ms +-------------------------------------------------------------+

📊 Empirical Benchmarks & Performance Metrics Benchmarked under optimized release profile (opt-level = 3, lto = thin, codegen-units = 1):

Subsystem / Operation Benchmark Cycles Total Elapsed Average Latency Status

🛡️ AstGuard 6-Pass Verification 1,000 iterations 9.036 ms 9.04 µs (0.009 ms / check) 100% PASS

⚡ AstContextCache (FIPS 180-4 SHA-256) 1,000 inserts/lookups 18.675 ms 18.68 µs / digest + LRU 100% PASS

🔌 MCP Stdio JSON-RPC Dispatch 1,000 round-trips 42.316 ms 42.32 µs / dispatch 100% PASS

✂️ AstDiffEngine (Patch & Skeleton) 500 cycles 28.063 ms 56.13 µs / operation 100% PASS

🧠 SymbolGraph Polyglot Indexer 600 files (1,600 symbols) 16.294 ms 27.15 µs / file 100% PASS

🔍 Industry Comparison Matrix

Capability locus-engine Traditional Linters (ESLint, Clippy) Cloud AI Guardrails

Verification Latency 9 µs – 0.05 ms (Nanosecond-scale) 250 – 1,500 ms (Process Spawns) 500 – 2,500 ms (Network Round-Trip)

Execution Architecture In-Memory Pure Rust Kernel Node.js / Python Runtime Remote HTTP Cloud API

Context Token Savings

50% - 80% (AST Skeleton)

MCP Protocol Support Built-In JSON-RPC 2.0 over Stdio Requires Custom Wrappers Proprietary APIs

Memory Safety 100% Safe Rust (0 Unsafe Blocks) Varies (C/C++/Node) Undefined

External Dependencies Zero Crypto/Runtime Bloat Heavy node_modules / Python env Cloud Connection & API Keys

Deterministic Guarantee 100% Formal Invariant Rejection Heuristic Warnings Probabilistic LLM Re-evaluation

🏛️ System Architecture & Workflow Pipeline

flowchart TD subgraph Input ["Incoming Code / AI Agent Patch"] RawCode["Raw Code Snippet / File"] end

subgraph AstGuardPipeline ["🛡️ AstGuard: 6-Pass Deterministic Firewall (<0.05ms)"] P0["Pass 0: Delimiter Balance (Dijkstra)"] P1["Pass 1: Async Mutex Across Await"] P2["Pass 2: Division-by-Zero Guard"] P3["Pass 3: Array Bounds Overflow"] P4["Pass 4: Unsafe Unwrap / Expect Trap"] P5["Pass 5: ReDoS Catastrophic Backtracking"] P6["Pass 6: TS/JS Deep Null Dereference"] end

subgraph Resolution ["Resolution & Verification Verdict"] VerdictSafe{"All Passes Passed?"} Reject["❌ Immediate Rejection & Counterexample"] Approve["✅ Verified Safe AST"] end

subgraph ContextEngine ["✂️ AstDiffEngine & 🧠 SymbolGraph"] Cache["⚡ AstContextCache (FIPS 180-4 SHA-256)"] Skeleton["Context Compression (>50-80% Token Savings)"] Patch["Surgical Byte-Span Node Replacement"] end

subgraph Interfaces ["Exposed Runtime Interfaces"] CLI["💻 CLI Binary: locus check / graph / patch"] MCP["🔌 Model Context Protocol Server: locus mcp"] LIB["📦 Rust Library Crate: locus_engine"] end

RawCode --> P0 --> P1 --> P2 --> P3 --> P4 --> P5 --> P6 --> VerdictSafe VerdictSafe -->|No| Reject VerdictSafe -->|Yes| Approve Approve --> Cache --> Skeleton --> Patch Patch --> Interfaces

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🛡️ The 6 Deterministic Safety Invariants

graph LR A[AstGuard Invariant Passes] --> B[1. Delimiter Balance: Dijkstra stack scan] A --> C[2. Concurrency: std::sync::Mutex across .await points] A --> D[3. Arithmetic: Unguarded division by variable] A --> E[4. Bounds: Array index without length checks] A --> F[5. Panics: Unguarded .unwrap() and .expect()] A --> G[6. ReDoS: Exponential nested regex quantifiers]

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Delimiter Balance (Dijkstra Algorithm): Performs a linear single-pass stack scan validating matching closure for {} [] () across raw byte streams while safely ignoring string literals and escapes.

Async Mutex Concurrency Trap: Prevents blocking std::sync::Mutex locks across asynchronous .await suspension points to eliminate thread pool exhaustion and deadlocks.

Division-by-Zero Protection: Proves the denominator is non-zero ($y \neq 0$) before permitting arithmetic evaluation.

Array Bounds Protection: Ensures array and slice indexing (arr[i]) is preceded by length assertions or safe accessors (.get()).

Unsafe Unwrap Guard: Eliminates panic-inducing direct .unwrap() or .expect() calls lacking prior safety checks (is_some(), is_ok(), or if let).

ReDoS Catastrophic Backtracking Guard: Identifies polynomial and exponential nested quantifiers (such as (a+)+$) that freeze CPU execution threads.

🔌 Model Context Protocol (MCP) Integration locus-engine ships with a built-in, zero-dependency MCP server running over stdio (JSON-RPC 2.0). It connects directly to Claude Code, Claude Desktop, Cursor, Windsurf, and VS Code. ⚙️ Claude Desktop / Cursor Configuration Add locus to your claude_desktop_config.json or Cursor MCP settings: { "mcpServers": { "locus": { "command": "locus", "args": ["mcp"] } } } 🛠️ Exposed MCP Tools:

MCP Tool Name Arguments Capabilities & Output

check_safety {"code": "string", "path": "string"} Executes 6-pass AST verification; returns passed/failed report with exact violation byte span.

skeletonize {"code": "string", "language": "rust|typescript|python"} Strips implementation bodies while preserving all signatures, saving >50-80% LLM context tokens.

patch_symbol {"source": "string", "symbol": "string", "new_code": "string", "language": "string"} Performs surgical byte-offset node replacement of a target function/struct without rewriting unchanged code.

index_graph {"path": "string"} Recursively indexes project directory, extracts definitions, and maps cross-file dependency edges.

🚀 Quick Install & CLI Usage Instant One-Line Installation 🐧 Linux & 🍏 macOS: curl -fsSL https://raw.githubusercontent.com/ahmadshady747-create/LOCUS/main/scripts/install.sh | bash 🪟 Windows (PowerShell): irm https://raw.githubusercontent.com/ahmadshady747-create/LOCUS/main/scripts/install.ps1 | iex 📦 Via Cargo (crates.io): cargo install locus-engine

Command Line Reference

1. Deterministic Safety Verification (<0.05ms)

2. Index Workspace Symbol Graph & Measure Token Savings

3. Surgical Symbol Patching

4. Start Model Context Protocol (MCP) stdio Server

🛠️ Rust Library Integration Add locus-engine to your Cargo.toml: [dependencies] locus-engine = "0.1.0" use locus_engine::{AstGuard, AstDiffEngine, SymbolGraph, AstContextCache, Language};

fn main() { let code = "pub fn safe_calc(a: f64, b: f64) -> f64 { if b != 0.0 { a / b } else { 0.0 } }";

// 1. Instant Invariant Safety Verification (9µs) let report = AstGuard::verify(code); assert!(report.passed);

// 2. Surgical Context Compression (>70% Token Savings) let skeleton = AstDiffEngine::skeletonize(code, Language::Rust); println!("Compressed Skeleton:\n{}", skeleton);

// 3. Fast In-Memory FIPS 180-4 SHA-256 LRU Cache let cache = AstContextCache::new(1024); let hash = cache.insert(code, skeleton, 1); assert_eq!(hash.len(), 64); }

📂 Repository Anatomy d:\LOCUS\ ├── Cargo.toml # Single-crate package manifest (locus bin + locus_engine lib) ├── LICENSE # Business Source License 1.1 with explicit As-Is disclaimer ├── README.md # Comprehensive technical documentation & benchmarks ├── SPEC.md # Detailed formal specification of core algorithms ├── .gitattributes # GitHub Linguist classification (100% Rust project) ├── scripts/ │ ├── install.sh # One-line curl installer for Linux & macOS │ └── install.ps1 # One-line PowerShell installer for Windows ├── tests/ │ └── benchmarks.rs # High-precision benchmark & stress test suite └── src/ ├── lib.rs # Public library exports ├── main.rs # CLI entrypoint (check, graph, patch, mcp commands) ├── types.rs # Core models (SymbolNode, SymbolEdge, VerificationReport) ├── guard.rs # 6-pass deterministic AST safety invariants engine ├── cache.rs # Pure FIPS 180-4 SHA-256 LRU cache with monotonic indexing ├── graph.rs # Polyglot symbol graph & dependency resolver (Rust, TS, Python) ├── diff.rs # Surgical byte-span AST patching and skeletonizer └── mcp.rs # Zero-dependency stdio Model Context Protocol (MCP) server

📄 Licensing & Commercial Tiers locus-engine is published under the Business Source License 1.1 (BSL 1.1):

License Tier Target Audience / Scope Pricing

Free Tier Individuals, students, open-source projects, and teams with < 5 developers. $0 (Free)

Internal Commercial Seat Internal usage & CI/CD within organizations with 5+ developers (Internal use only; no re-selling/SaaS). $150 USD / seat / year

Commercial SaaS & Cloud OEM Embedding, hosting, or offering locus-engine as a commercial SaaS, cloud API, or OEM product. $10,000 USD / year

Warranty & Support Disclaimer (As-Is / Self-Service): The software is provided "AS IS" on a self-service basis without warranties of any kind. Dedicated technical support, custom SLA guarantees, and enterprise integration assistance are not included unless negotiated under a separate custom agreement.

For license activation and commercial contracts: Contact the author below or email licensing@locus.dev.

👤 Author & Direct Connect Architected & built independently by Ahmed Shadi (Libya 🇱🇾).

📘 Facebook: Ahmed Shadi Profile 🐙 GitHub: @ahmadshady747-create 📧 Direct Inquiries: Via GitHub Issues & Discussions

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