Batho v1.4.1 Technical Whitepaper

Bidirectional AST Traversal & Hypergraph Orchestrator

Document Version: 1.4.1
Date: July 2026
Classification: Public — Enterprise Technical Reference
Author: Batho Core Team
Status: Production-Ready

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Executive Summary

Batho (Bidirectional AST Traversal & Hypergraph Orchestrator) is a deterministic, production-grade code intelligence engine that transforms raw codebases into queryable, time-aware structured hypergraphs. Version 1.4.1 delivers a unified configuration schema (batho.yaml), a high-performance Arrow IPC Bundle storage format, lossless bidirectional traversal support, a streamlined 8-command CLI interface, and an Arrow-backed columnar graph backend with auto-selection for memory-efficient large-codebase indexing. Batho is designed for polyglot enterprises managing millions of lines of code across hundreds of repositories.

Key Value Propositions

Metric	Value
Supported Languages	40+ via tree-sitter
Context Compression	Up to 10x for LLM injection
Incremental Patch Speed	10–100x faster than full re-index
Test Coverage	864 automated tests
Cache Hit Rate	>95% on typical PR-sized changes
Snapshot Retention	90 days default, configurable
Max Indexed Files	200,000 per repository

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System Architecture at a Glance

Figure 1: Batho v1.4.1 System Architecture Overview - High-level data flow from source inputs through the core engine to consumption interfaces.

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List of Figures

Figure	Title	Section
Figure 1	Batho v1.4.1 System Architecture Overview	Overview
Figure 2	High-Level System Architecture	Architecture Overview
Figure 3	Data Flow Pipeline	Architecture Overview
Figure 4	Subsystem Interactions	Core Subsystems
Figure 5	Graph Consistency Model	Code Graph Engine
Figure 6	Cross-File Resolution Process	Code Graph Engine
Figure 7	Token Budget Algorithm	BSG Compression
Figure 8	Incremental Patch Lifecycle	Time Machine
Figure 9	Security Architecture Overview	Security & Governance
Figure 10	Zero-Code-Execution Guarantee	Security & Governance
Figure 11	BSG Interceptor Pipeline	Security & Governance
Figure 12	Interceptor Sequence	Security & Governance
Figure 13	Audit Logging Pipeline	Security & Governance
Figure 14	Integrity Chain	Security & Governance
Figure 15	Chain of Custody Flow	Security & Governance
Figure 16	Threat Model	Security & Governance
Figure 17	Cache Strategy	Performance & Scalability
Figure 18	Deployment Architecture	Deployment & Operations
Figure 19	Configuration Loading Flow	Deployment & Operations
Figure 20	CI/CD Pipeline Flow	Deployment & Operations
Figure 21	Command Taxonomy	Deployment & Operations
Figure 22	Monitoring Stack	Deployment & Operations
Figure 23	Backup Flow	Deployment & Operations
Figure 24	Schema Dependency Graph	Appendix
Figure 25	Arrow Bundle Architecture	Storage & Persistence Layer
Figure 26	MVCC Generation Lifecycle	Storage & Persistence Layer
Figure 27	Arrow Store Compaction Pipeline	Storage & Persistence Layer
Figure 28	Unified Cache Architecture	Storage & Persistence Layer
Figure 29	Dependency Indexing Pipeline	Dependency Intelligence
Figure 30	Integrity Check & Repair Pipeline	Integrity & Repair System
Figure 31	Orchestrator → Module Delegation Flow	Infrastructure & Shared Services
Figure 32	Plugin Dependency Graph	BSG Compression

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Table of Contents

1. Architecture Overview
2. Core Subsystems
3. Storage & Persistence Layer
4. Deterministic Code Graph Engine
5. BSG Compression & LLM Injection
6. Dependency Intelligence
7. Time Machine & Incremental Patching
8. Integrity & Repair System
9. Security & Governance
10. Performance & Scalability
11. Infrastructure & Shared Services
12. Deployment & Operations
13. Appendix: Schema Reference

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Document Control

Version	Date	Author	Changes
1.4.1	2026-08-26	Batho Core Team	Review hardening, thread safety, path sanitization, atomic writes, and documentation updates
1.4.0	2026-08-04	Batho Core Team	Stdlib expansion to 27 languages, graph builder phases 4-5, BSG interceptors, and security/performance hardening
1.3.2	2026-07-27	Batho Core Team	H2 path traversal hardening, H5 Unicode identifier extraction support
1.3.1	2026-07-22	Batho Core Team	Entity ID UX gap fix, CLI root resolution bug fix, test isolation
1.3.0	2026-07-22	Batho Core Team	Arrow graph backend with auto-selection, build metrics accuracy, memory optimization, documentation cleanup
1.2.1	2026-07-20	Batho Core Team	Bug fixes (patch.py NameError, registry race, atomic cache writes), MCP tool improvements, docs version alignment
1.2.0	2026-07-05	Batho Core Team	Added MCP Server, multi-repo registry, community detection, prompts/resources, SKILL.md
1.1.1	2026-06-29	Batho Core Team	Added Storage, Dependency, Integrity, and Infrastructure sections; added BSG plugin catalog; renumbered sections
1.1.0	2026-06-10	Batho Core Team	Refactored to v1.1.0 (unified batho.yaml, 7 CLI commands, Arrow IPC format, removed legacy subsystems)
1.0.0	2026-05-17	Batho Core Team	Initial whitepaper for Batho v1

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For the latest documentation, visit:

• CLI Reference: batho --help