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Tech Stack

Component Technology
Language Rust
Database CozoDB (embedded relational-graph, Datalog queries)
Parsing tree-sitter
CLI Clap
Web Server Axum

Project Structure

src/
  cli/         - CLI commands (Clap)
  config/      - Project configuration
  db/          - CozoDB persistence layer
  doc/         - Documentation generator
  graph/       - Graph query engine
  indexer/     - Code parser (tree-sitter)
  doc_indexer/ - Documentation indexer
  mcp/         - MCP protocol handler
  watcher/     - File change watcher
  web/         - Web server (Axum)

docs/
  planning/    - Planning documents
  requirement/ - Requirements documents (PRD)
  analysis/    - Analysis documents
  design/      - Design documents (HLD)
  business/    - Business logic documents

Supported Languages

LeanKG supports indexing and analysis for the following languages:

Language Extensions Support Level
Go .go Full - functions, structs, interfaces, imports, calls
TypeScript .ts, .tsx Full - functions, classes, imports, calls
JavaScript .js, .jsx Full - functions, classes, imports, calls
Python .py Full - functions, classes, imports, calls
Rust .rs Full - functions, structs, traits, imports, calls
Java .java Full - classes, interfaces, methods, constructors, enums, imports, calls
Kotlin .kt, .kts Full - classes, objects, companion objects, functions, constructors, imports, calls
Ruby .rb Full - classes, modules, methods, imports, calls
PHP .php Full - classes, interfaces, properties, methods, calls
Perl .pl, .pm Full - packages, subs, imports, calls
R .r, .R Full - functions, assignments, imports
Elixir .ex, .exs Full - modules, functions, macros, structs, calls
Terraform .tf Full - resources, variables, outputs, modules
YAML .yaml, .yml Full - CI/CD pipelines, configurations
Markdown .md Full - documentation sections, code references

Architecture

graph TB
    subgraph "AI Tools"
        Claude[Claude Code]
        Open[OpenCode]
        Cursor[Cursor]
        Antigravity[Google Antigravity]
    end

    subgraph "LeanKG"
        CLI[CLI Interface]
        MCP[MCP Server]
        Watcher[File Watcher]

        subgraph "Core"
            Indexer[tree-sitter Parser]
            Graph[Graph Engine]
            Cache[Query Cache]
        end

        subgraph "Storage"
            CozoDB[(CozoDB)]
        end
    end

    Claude --> MCP
    Open --> MCP
    Cursor --> MCP
    Antigravity --> MCP
    CLI --> Indexer
    CLI --> Graph
    Watcher --> Indexer
    Indexer --> CozoDB
    Graph --> CozoDB
    Graph --> Cache
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