Module format 

Binary Rule Format (.drv - Driven Rule)

Zero-copy binary format for AI coding rules, achieving 75% size reduction and 50-150x faster parsing compared to text-based formats.

Format Structure

DrivenRule (.drv)
├── Header (16 bytes)
│   ├── Magic: "DRV\0" (4 bytes)
│   ├── Version: u16 (2 bytes)
│   ├── Flags: u16 (2 bytes)
│   ├── Section Count: u32 (4 bytes)
│   └── Checksum: u32 (4 bytes - Blake3 truncated)
│
├── String Table (variable)
│   ├── Count: u32
│   └── Strings: [length: u16, bytes: [u8; length]]...
│
├── Persona Section (optional)
├── Standards Section (optional)
├── Context Section (optional)
└── Workflow Section (optional)

Structs

ContextSection

Context section for project-specific settings

DrvDecoder

Decoder for reading .drv binary files

DrvEncoder

Encoder for creating .drv binary files

DrvHeader

Header for .drv files (16 bytes, aligned)

FormatVersion

Format version information

PersonaSection

Persona section defining AI agent behavior

RuleEntry

A single rule entry in the standards section

StandardsSection

Standards section containing coding rules

VersionMigrator

Version migration handler

WorkflowSection

Workflow section defining development processes

WorkflowStep

A single step in a workflow

Enums

RuleCategory

Rule category enumeration

SectionType

Section type identifiers

Constants

DRV_MAGIC

Magic bytes for .drv files

DRV_VERSION

Current format version