litvc 1.2.1

Lit - The agentic-first distributed version control system. A complete Git replacement designed for AI agents first and humans second.
Documentation

Lit — The Agentic-First Distributed Version Control System

The world's first universal version control system designed for AI agents first and humans second.

Lit is a complete Git replacement written in Rust — 67 commands, 30 MCP tools, post-quantum cryptographic security, sandboxed execution, and structured machine-readable output. Every interface is designed for autonomous agent workflows, with human-friendly output available via a single flag.

Unlike Git, Lit is not limited to source code. Its pluggable content type system versions CAD models, EDA schematics, manuscripts, databases, scientific datasets, media assets, geospatial data, and any other domain content — with domain-appropriate diff, merge, and storage strategies. Arbitrary agent profiles let CAD designers, EDA engineers, technical writers, DBAs, and data scientists work alongside software agents in a unified versioned workspace. Datacenter deployment features enable cluster sharding, replication, health monitoring, and Prometheus-style metrics for production-scale operation.

Why Lit?

Git was designed in 2005 for human developers using terminals. Every interface — output formatting, error messages, interactive prompts, conflict markers — assumes a human is reading and responding. AI agents must parse Git's freeform text output with fragile regex, work around interactive prompts, and translate <<<<<<< conflict markers into something actionable.

Lit inverts this. Every command emits structured JSON by default. Errors include machine-actionable codes and remediation hints. Merge conflicts are structured objects, not text markers. Batch operations accept JSONL on stdin. Nothing ever prompts for input. Humans get the same power through a --human flag.

Git Lit
Designed for Human developers AI agents (humans supported)
Default output Freeform text Structured JSON
Error handling Freeform strings Typed error codes + remediation
Batch operations Shell scripting Native JSONL batch mode
API access Third-party wrappers Built-in REST + MCP + lit:// + stdio
Merge conflicts <<<<<<< markers Structured conflict objects
Agent metadata Commit message conventions First-class metadata field
Agent coordination None Swarm registration, file leasing
Agent workflow Branch → PR → merge Intent → Commit → Converge
Identity None DID-based identity, UCAN delegation
Trust scoring None Reputation tracking per agent
Issues & PRs None built-in Local-first, stored as git refs
Federation Centralized (GitHub/GitLab) Content-addressed peer-to-peer
Sandboxing None Process isolation with env/fs/net fences
Content types Source code only CAD, EDA, CAM, simulation, AI models, manuscripts, DBs, media, etc.
Agent types N/A SWE, CAD, EDA, writer, DBA, reviewer, CI
Datacenter N/A Sharding, replication, metrics, health
Cryptography SHA-1 / SHA-256 SHA3-512 + BLAKE3 (quantum-resistant)
Signatures GPG / SSH ML-DSA-87 (NIST FIPS 204)
Encryption None built-in AES-256-GCM at rest, TLS 1.3 in transit
Compliance None FIPS 140-3, auto self-test at startup
Interactive prompts Frequent Never (zero-prompt design)

Features

  • 67 CLI commands — full Git-equivalent workflow plus agent-native extensions
  • 30 MCP tools — LLM agents interact via Model Context Protocol tool calls
  • Decentralized identity -- DID-based identity with Ed25519 and ML-DSA-87 post-quantum keys
  • UCAN capability delegation -- fine-grained, cryptographically signed permission tokens
  • Agent trust scoring -- reputation tracking with event-driven trust levels
  • Local-first issues & PRs -- issue tracker and pull requests stored as git refs
  • Event subscriptions -- subscribe to repository events (commits, branches, merges)
  • Agent task delegation -- structured protocol for delegating work between agents
  • Content-addressed federation -- peer-to-peer repository sync with want-list negotiation
  • 4 transport protocols — HTTPS, SSH, lit:// (custom TCP), stdio pipe
  • Sandboxed execution — run untrusted code in isolated environments with filesystem, environment, and network fences
  • Intent → Commit → Converge — agentic workflow replacing branch/PR with scoped intents, commit attachment, and trust-gated convergence
  • Universal content types — 100 built-in types making Lit a one-stop VCS for modern engineering: CAD & 3D modeling (STEP, IGES, STL, 3MF, DWG/DXF, SolidWorks, CATIA, Inventor, Fusion 360, Creo, Siemens NX, Solid Edge, Rhino, Parasolid, ACIS, JT, OBJ, FBX, glTF/GLB, USD, COLLADA, PLY, Blender, Alembic), EDA (KiCad, Gerber, Excellon, Altium, EAGLE, OrCAD, Verilog/SystemVerilog, VHDL, GDSII, OASIS, IPC-2581, Touchstone, LEF/DEF, SPICE), CAM (G-code, STEP-NC, APT, Mastercam), simulation/FEA/CFD (Nastran, Abaqus, ANSYS, LS-DYNA, OpenFOAM, COMSOL, Gmsh, VTK, CGNS, Exodus, Modelica, Simulink, FMU), AI/ML models (ONNX, SafeTensors, PyTorch, TensorFlow, Keras, GGUF/GGML, TensorRT, Core ML, TFLite, NumPy, checkpoints), plus manuscripts, databases, scientific data, media, geospatial, legal, and financial formats — each with domain-appropriate diff, merge, and storage strategies
  • Datacenter deployment — cluster node management, consistent-hash sharding, configurable replication (sync/async/semi-sync), health monitoring, Prometheus-style metrics, connection pooling, and chunked large-object transfer
  • Generic agent profiles — 10 built-in profiles (SWE, CAD designer, EDA engineer, writer, DBA, reviewer, CI bot, security auditor, data scientist, orchestrator) with capabilities, trust levels, content type affinity, resource limits, and path-based access control
  • Swarm coordination — multi-agent registration, file leasing, and conflict-free concurrent access
  • Post-quantum signatures — ML-DSA-87 (NIST FIPS 204, Security Level 5)
  • FIPS 140-3 compliance — AES-256-GCM, PBKDF2-HMAC-SHA512, automatic Known Answer Tests at startup
  • Airgap mode — complete network isolation for classified environments (USB, file shares only)
  • Atomic transactions — begin/commit/rollback multi-operation sequences
  • Large File Storage — LFS tracking and migration for binary assets
  • Git interop — bidirectional import/export with existing Git repositories
  • Command ontology — machine-readable type graph for agent discovery and SDK generation
  • JSON Schema — auto-generated draft 2020-12 schemas for all command inputs/outputs
  • Per-IP rate limiting — sliding window throttle (100 req/60s) on all server endpoints
  • Tamper-evident audit logs — HMAC-SHA256 signed, append-only operation logs

Installation

cargo build --release

cargo install --path .

Pre-built binaries for Linux, macOS, and Windows are available on the Releases page.

Quick Start

For Agents (JSON output — default)

# Initialize

lit init

# → {"status":"ok","command":"init","path":"/path/to/repo"}


# Stage and commit

lit add src/

lit commit -m "implement feature X"

# → {"status":"ok","command":"commit","hash":"abc123...","tree":"def456..."}


# Check status

lit status

# → {"status":"ok","command":"status","branch":"main","staged":[],"modified":[],"clean":true}


# Batch operations via JSONL stdin

echo '{"op":"add","files":["src/a.rs"]}
{"op":"commit","message":"fix bug"}' | lit batch

For Humans

# Use --human or -H for familiar output

lit status --human

lit log --human

lit diff --human


# Or set globally

export LIT_OUTPUT=human

Commands (65+)

Version Control

lit init [--bare] [path]           # Initialize repository

lit add <files...>                 # Stage files

lit commit -m <message> [--intent <id>]  # Record changes (optionally attach to intent)

lit status                         # Show working tree status

lit log [--count N]                # Show commit history

lit diff [--word-diff] [--stat]    # Show changes (structured hunks)

lit show <object>                  # Inspect any object

lit branch [name] [--delete]       # Manage branches

lit checkout <target> [-b]         # Switch branches

lit merge <branch>                 # Merge branches (3-way)

lit resolve <file> --strategy=X    # Programmatic conflict resolution

lit tag <name> [--sign]            # Create tags (with optional PQ signatures)

lit stash [push|pop|apply|list|drop] # Stash work-in-progress

lit reset [--soft|--mixed|--hard]  # Move HEAD

lit revert <commit>                # Create inverse commit

lit cherry-pick <commit>           # Apply specific commits

lit rebase <base>                  # Replay commits

lit blame <file>                   # Line-by-line authorship

lit bisect <start|good|bad|reset>  # Binary search for bug-introducing commit

lit reflog                         # Reference update history

Remote Operations

lit remote add <name> <url>        # Add remote

lit push <remote> <branch>         # Push to remote (--force available)

lit pull <remote> <branch>         # Fetch and merge

lit clone <url> [directory]        # Clone repository

lit fetch <remote> [branch]        # Download without merging

Supported transports: HTTPS, SSH, lit:// (custom TCP), file://, USB/removable media, network shares.

Agentic Commands

lit batch                          # Execute JSONL operations from stdin

lit serve --port 3000              # Launch HTTP REST API server

lit serve --stdio                  # Launch stdio JSON pipe server

lit serve --daemon                 # Launch lit:// TCP daemon

lit mcp-serve --stdio              # Launch MCP tool server (stdio)

lit mcp-serve --port 8385          # Launch MCP tool server (HTTP)

lit tx <begin|commit|rollback>     # Atomic transaction mode

lit snapshot -m <msg>              # Add-all + commit in one step

lit search <query>                 # Full-text search across history

lit watch                          # Emit filesystem change events as JSON

lit ontology                       # Output command ontology for agent discovery

lit schema [--command <id>]        # JSON Schema (draft 2020-12) from ontology

Swarm Coordination

lit swarm register <agent-id>      # Register an agent in the swarm

lit swarm list                     # List registered agents

lit swarm lease-acquire --agent <id> --path <file> --duration 300

                                   # Acquire exclusive file lease (seconds)

lit swarm lease-release --agent <id> --path <file>
                                   # Release a file lease

lit swarm lease-list               # List all active leases

Sandbox

Run untrusted code in process-isolated environments with filesystem, environment, and network fences:

lit sandbox init [name]            # Create sandbox from working tree

lit sandbox run <name> -- <cmd>    # Run command inside sandbox

lit sandbox list                   # List all sandboxes

lit sandbox destroy <name>         # Remove a sandbox

Isolation layers:

Layer Protection
Filesystem Working tree copied into .lit/sandboxes/<name>/
Environment env_clear() — only minimal vars exposed
Home / Temp HOME, USERPROFILE, TEMP, TMP redirected to sandbox dir
PATH Restricted to system directories only
Network LIT_AIRGAPPED=1 — blocks all network protocols
Git config GIT_CONFIG_NOSYSTEM=1 — prevents config file leaks
Credentials Cleared — no cloud tokens, SSH keys, or API keys present

Identity & Trust

lit did generate [--method ed25519|ml-dsa-87]  # Generate DID identity

lit did show                                   # Show current identity

lit did resolve <did>                          # Resolve a DID to its document

lit ucan issue <audience> --resource <r> --action <a>  # Issue UCAN token

lit ucan list [audience]                       # List UCAN tokens

lit ucan revoke <cid>                          # Revoke a UCAN token

lit trust show <did>                           # Show agent trust score

lit trust list                                 # List all tracked agents

lit trust history <did>                        # Show trust event history

Issues & Pull Requests

lit issue create <title> [--body <b>] [--label <l>]    # Create issue

lit issue list [--state open|closed|all]                # List issues

lit issue show <id>                                     # Show issue

lit issue close <id>                                    # Close issue

lit issue comment <id> <body>                           # Comment on issue

lit pr create <title> --head <branch> [--base main]     # Create PR

lit pr list [--state open|merged|closed|all]             # List PRs

lit pr show <id>                                         # Show PR

lit pr merge <id>                                        # Merge PR

lit pr close <id>                                        # Close PR

lit pr comment <id> <body>                               # Comment on PR

Intent → Commit → Converge

Declare scoped intents, attach commits, and converge work — replacing the branch → PR → merge ceremony:

lit intent create <title> --agent <id> --scope <paths...>  # Declare a scoped unit of work

lit intent list [--status active] [--agent <id>]           # List intents

lit intent show <intent-id>                                # Show intent details

lit intent close <intent-id>                               # Abandon an intent

lit commit -m <msg> --intent <intent-id>                   # Attach commit to intent

lit converge <intent-id> [--strategy auto|squash|rebase|accumulate]

                                                           # Merge intent into mainline

lit converge <intent-id> --dry-run                         # Preview convergence

lit converge <intent-id> --verify                          # Verify commit objects first

Intents auto-acquire swarm leases for their scope, detect scope conflicts with other active intents, and support hierarchical decomposition (parent/child intents). The accumulate strategy waits for all child intents to converge before merging the parent.

Content Type Registry

Register, detect, and manage content types for domain-specific versioning. 100 built-in types make Lit a one-stop VCS for modern engineering — covering CAD, 3D modeling, EDA, CAM, simulation (FEA/CFD), AI/ML models, manuscripts, databases, scientific data, media, geospatial, and more — each with appropriate diff, merge, and storage strategies:

lit content-type list                            # List all registered content types

lit content-type list --domain cad               # Filter by domain

lit content-type show cad/step                   # Show STEP CAD type details

lit content-type show db/sqlite                  # Show SQLite database type

lit content-type detect model.step circuit.kicad_pcb  # Auto-detect file types

lit content-type register custom/my-format \     # Register custom type

    --name "My Format" --domain scientific \

    --extensions h5x,hdf --diff-strategy structural \

    --merge-strategy schema-aware --storage-tier chunked

Built-in domains: software, cad (STEP, IGES, STL, 3MF, DWG/DXF, SolidWorks, CATIA, Inventor, Fusion 360, Creo, Siemens NX, Solid Edge, Rhino, Parasolid, ACIS, JT, OBJ, FBX, glTF/GLB, USD, COLLADA, PLY, Blender, Alembic, 3DS), eda (KiCad PCB/schematic, Gerber, Excellon, Altium, EAGLE, OrCAD, Verilog/SystemVerilog, VHDL, GDSII, OASIS, IPC-2581, Touchstone, LEF/DEF, SPEF, SPICE), cam (G-code, STEP-NC, APT, Mastercam), simulation (Nastran, Abaqus, ANSYS, LS-DYNA, OpenFOAM, COMSOL, Gmsh, VTK, CGNS, Exodus, Modelica, Simulink, FMU), ml-model (ONNX, SafeTensors, PyTorch, TensorFlow, Keras, GGUF/GGML, TensorRT, Core ML, TFLite, NumPy, pickle, checkpoints, joblib), manuscript (LaTeX, DOCX, Typst, AsciiDoc), database (SQLite, CSV, Parquet, SQL migrations), scientific (HDF5, FITS, Jupyter), media (image, video, audio), geospatial (GeoJSON, Shapefile), legal (PDF), financial (Excel), config (Terraform, Kubernetes).

Each content type specifies:

  • Diff strategy — text, binary, structural, semantic, or opaque
  • Merge strategy — 3-way text, manual-resolve, schema-aware, component-level, append-only, or last-writer-wins
  • Storage tier — standard, LFS, chunked, or external
  • Metadata schema — JSON Schema fragment for domain-specific fields (triangle count, PCB layers, table schemas, etc.)

Datacenter Deployment

Cluster management, sharding, replication, health monitoring, and Prometheus-style metrics for production datacenter deployments:

lit datacenter status                             # Show cluster overview

lit datacenter register-node node-1 \             # Register a cluster node

    --name "us-east-primary" --endpoint 10.0.1.1:9418 \

    --region us-east-1 --role primary

lit datacenter configure \                        # Configure cluster settings

    --replication-factor 3 --shard-strategy consistent-hash \

    --replication-mode semi-sync --write-concern 2 \

    --metrics-enabled true --metrics-port 9090

lit datacenter health                             # Run health checks on all nodes

lit datacenter metrics                            # Collect Prometheus-style metrics

lit datacenter remove-node node-1                 # Drain and remove a node

Features:

  • Consistent-hash sharding — distribute objects across nodes with virtual shard rings
  • Configurable replication — synchronous, asynchronous, or semi-sync with tunable write concern
  • Node roles — primary, replica, relay (edge cache), observer (monitoring only)
  • Health monitoring — heartbeat-based liveness detection with configurable timeout
  • Prometheus metrics — lit_objects_total, lit_objects_size_bytes, lit_cluster_nodes_healthy, etc.
  • Connection pooling — configurable per-node connection pool size
  • Chunked transfer — large objects split into configurable chunks for inter-node transfer
  • Domain-affinity sharding — keep a content domain's objects co-located for locality

Agent Profiles

Domain-specific agent profiles with capabilities, trust levels, content type affinity, and resource limits — enabling arbitrary agents beyond software engineering:

lit agent-profile list                            # List all profiles

lit agent-profile list --domain cad               # Filter by domain

lit agent-profile show cad-designer               # Show CAD designer profile

lit agent-profile capabilities                    # List all capabilities across domains

lit agent-profile capabilities --domain eda       # EDA-specific capabilities

lit agent-profile register my-bot \               # Register custom profile

    --name "My Custom Agent" --domain devops \

    --capabilities read,write,deploy,test \

    --trust-level elevated \

    --content-types config/terraform,config/kubernetes \

    --allowed-paths 'infra/**,deploy/**'

lit agent-profile remove my-bot                   # Remove custom profile

Built-in profiles (10):

Profile Domain Capabilities Trust Content Types
swe-default Software read, write, branch, merge, test, diff, intent, converge standard All source code
cad-designer CAD read, write, branch, lfs, diff, intent, structural-analysis standard STEP, STL, IGES, 3MF
eda-engineer EDA read, write, branch, diff, intent, structural-analysis standard KiCad, Gerber, SPICE
tech-writer Writer read, write, branch, diff, intent, content-metadata standard LaTeX, DOCX, Typst, AsciiDoc
dba DBA read, write, branch, diff, intent, schema-management elevated SQLite, CSV, Parquet, SQL
reviewer Reviewer read, review, diff, converge elevated All (read-only)
ci-bot CI read, test, deploy, security-scan, diff elevated All
security-auditor Security read, review, security-scan, diff elevated All (read-only)
data-scientist DataScience read, write, branch, lfs, intent, schema-management standard HDF5, Jupyter, Parquet, CSV
orchestrator General read, orchestrate, intent, converge, review admin All

Each profile enforces:

  • Capabilities — what operations the agent can perform
  • Content type affinity — which file types the agent is designed for
  • Path-based access control — allowed/denied glob patterns
  • Resource limits — max file size, storage quota, files per commit, concurrent leases, rate limits
  • Trust level — untrusted → limited → standard → elevated → admin

Events & Delegation

lit subscribe add <event-types...> [--branch <b>]  # Subscribe to events

lit subscribe list                                  # List subscriptions

lit subscribe remove <id>                           # Remove subscription

lit subscribe events [--event-type <t>] [--limit N] # Read recent events

lit delegate create <to> <title> [--priority high]  # Delegate task to agent

lit delegate accept <task-id>                        # Accept delegated task

lit delegate complete <task-id> <result>              # Complete task

lit delegate list [--agent <did>] [--status <s>]      # List tasks

lit delegate show <task-id>                            # Show task details

Federation

lit peer add <did> --endpoint <url> --public-key <hex>  # Add peer

lit peer remove <did>                                    # Remove peer

lit peer list                                            # List all peers

lit peer show <did>                                      # Show peer details

lit peer sync <did>                                      # Sync with peer

Large File Storage

lit lfs track <patterns...>        # Track file patterns (e.g., "*.bin")

lit lfs migrate [--threshold N]    # Migrate existing large files to LFS

Maintenance & Migration

lit verify                         # Full repository integrity check

lit gc                             # Garbage collection — pack loose objects

lit import-git <source>            # Import from Git repository

lit export-git <destination>       # Export to Git format

lit rotate-key                     # Rotate encryption passphrase

lit config [get|set|show]          # Manage configuration settings

Structured Errors

All commands return typed LitError values with machine-actionable codes, not freeform strings:

{
  "status": "error",
  "command": "commit",
  "code": "REPO_NOT_FOUND",
  "message": "Not a lit repository (or any parent up to /)",
  "suggestions": ["Run 'lit init' to create a new repository"]
}

Error codes: ENCRYPTION_ERROR, IO_ERROR, CONFIG_ERROR, NETWORK_ERROR, REPO_NOT_FOUND, OBJECT_NOT_FOUND, INDEX_ERROR, MERGE_CONFLICT, AUTH_FAILURE, INVALID_INPUT, PERMISSION_DENIED, TIMEOUT, PROTOCOL_ERROR, INTERNAL_ERROR, GENERAL_ERROR.

Ontology & JSON Schema

Lit ships a built-in ontology — a typed knowledge graph of every command, type, relationship, and classification in the system. Agents use this for self-discovery, SDK generation, and input validation.

# Machine-readable ontology (JSON)

lit ontology


# Full JSON Schema (draft 2020-12) — all types and command interfaces

lit schema


# Single command schema

lit schema --command commit

# → {"$schema": "https://json-schema.org/draft/2020-12/schema",

#    "input": {"properties": {"message": {"type": "string"}, ...}}}

The schema is auto-generated from the ontology — types map to $defs, commands map to input/output schemas with metadata (idempotent, safe, side_effects, preconditions). See ONTOLOGY.md for the complete human-readable reference.

API Server

Four server modes for different integration patterns:

# HTTP REST API — for agent swarms and CI/CD

lit serve --port 3000 --token $LIT_TOKEN


# stdio JSON pipe — for direct process integration

lit serve --stdio


# lit:// TCP daemon — for custom protocol clients

lit serve --daemon --port 9418


# Example: agent commits via REST

curl -X POST http://localhost:3000/api/v1/commit \

  -H "Authorization: Bearer $LIT_TOKEN" \

  -d '{"message":"implement feature X","author":"agent-7","sign":true}'

All server endpoints enforce per-IP rate limiting (100 requests per 60-second sliding window). Body size is capped at 1 MB.

MCP Server

Lit exposes itself as an MCP (Model Context Protocol) tool server, enabling LLM agents to interact with repositories directly through tool calls:

lit mcp-serve --stdio      # For stdio-based MCP clients (VS Code, Claude Desktop)

lit mcp-serve --port 8385  # For HTTP-based MCP clients

Tools (30): lit_status, lit_diff, lit_log, lit_show, lit_blame, lit_reflog, lit_add, lit_commit, lit_snapshot, lit_branch, lit_checkout, lit_merge, lit_resolve, lit_rebase, lit_cherry_pick, lit_revert, lit_reset, lit_stash, lit_tag, lit_push, lit_pull, lit_fetch, lit_clone, lit_search, lit_verify, lit_gc, lit_init, lit_config, lit_ontology, lit_schema.

Resources: lit://status, lit://branches, lit://log, lit://ontology, lit://schema.

Configuration

# .lit/config.toml (repo-local) or ~/.litconfig.toml (global)



[core]

default_branch = "main"



[agent]

default_output = "json"       # json | human | msgpack

auto_sign = true              # sign all commits with PQ signatures



[merge]

default_strategy = "recursive"

auto_resolve = true



[security]

encryption = "aes-256-gcm"

fips_mode = true

audit_log = true



[airgap]

enabled = false               # block all network protocols

strict_mode = false           # USB-only (no network shares)

Configuration priority: CLI flags > environment variables (LIT_*) > repo-local > user global > system > defaults.

Cryptographic Security

Layer Algorithm Standard
Hashing SHA3-512 + BLAKE3 composite (192 hex chars) NIST FIPS 202
Signatures ML-DSA-87 (Dilithium5), Security Level 5 NIST FIPS 204
Encryption AES-256-GCM NIST FIPS 197
KDF PBKDF2-HMAC-SHA512, 600,000 iterations NIST SP 800-132
Audit logs HMAC-SHA256, tamper-evident NIST FIPS 198-1
Compliance FIPS 140-3 Level 1, auto self-test at startup NIST FIPS 140-3
PQ safety Resistant to Shor's and Grover's algorithms —

FIPS Known Answer Tests (SHA-256, SHA-512, SHA3-512, HMAC-SHA-256, RNG health) execute automatically on every startup when fips_mode = true.

See ENCRYPTION.md, FIPS_140-3_COMPLIANCE.md, and CRYPTOGRAPHY.md for details.

Transport Protocols

Lit auto-detects the transport from the URL and dispatches to the appropriate backend:

Protocol URL Format Use Case
HTTPS https://host/repo Public and private remotes over TLS
SSH ssh://host/repo or host:repo Authenticated access over SSH tunnels
lit:// lit://host:9418/repo Custom binary TCP for LAN deployments
file:// file:///path/to/repo Local filesystem URL
Local /path/to/repo or C:\repos\proj Bare path — no protocol prefix needed
UNC \\server\share\repo Windows network shares (SMB/CIFS)
USB E:\repos\proj or /media/usb/.. Removable media (auto-detected)
stdio lit serve --stdio JSON pipe for direct process control

Operating Modes

Lit supports four operating modes that can be combined (e.g., sandbox + airgap):

Standard Mode

Full distributed VCS with all network and local transports enabled. Push, pull, fetch, and clone work over HTTPS, SSH, lit://, and local paths.

lit clone https://github.com/org/repo       # HTTPS

lit clone ssh://server/repo                  # SSH

lit clone lit://192.168.1.10:9418/repo       # Custom TCP

lit clone /opt/repos/project                 # Local path

Local-Only Mode

Operate without any remote configuration — purely local version control. All commands that don't involve a remote work identically. Useful for solo development, offline work, or repositories that never need to synchronize.

lit init myproject && cd myproject

lit add . && lit commit -m "initial commit"

lit branch feature && lit checkout feature

lit log --human

Local-only repos can add remotes later via lit remote add with any supported transport.

Airgap Mode

Complete network isolation for classified and air-gapped environments. All TCP-based protocols (HTTPS, SSH, lit://, FTP) are blocked at the transport layer. Only physical and filesystem transports are allowed:

Transport Airgap Airgap Strict
Local filesystem Allowed Allowed
file:// URL Allowed Allowed
USB / removable Allowed Allowed
Network shares Allowed Blocked
HTTPS / SSH / lit Blocked Blocked 
lit --airgapped clone file:///media/usb/repo.lit

lit config set airgap.enabled true

lit config set airgap.strict_mode true   # USB-only, no network shares

Removable media is auto-detected via GetDriveTypeW on Windows and mount-point heuristics (/media/, /mnt/, /Volumes/) on Linux/macOS.

See AIRGAP.md for complete documentation.

Sandbox Mode

Run untrusted code in process-isolated environments with filesystem, environment, and network fences:

lit sandbox init demo

lit sandbox run demo -- python3 -m pytest tests/

lit sandbox destroy demo

Every sandboxed process gets:

  • Cleared environment — env_clear() strips all host variables
  • Redirected HOME/TEMP — point into the sandbox directory
  • Restricted PATH — system binaries only, no user-installed tools
  • Forced airgap — LIT_AIRGAPPED=1 blocks all network protocols
  • No credentials — no cloud tokens, SSH keys, or API keys present
  • Symlink protection — symlinks are skipped during sandbox copy to prevent escape

Sandboxes combine with airgap mode automatically. See EXAMPLES.md § Sandboxed Execution and the cross-platform demo scripts in examples/.

Use Cases

  • AI agent swarms — multiple agents collaborating via structured API with file leasing
  • Hardware design teams — CAD and EDA engineers versioning PCB layouts, schematics, and 3D models with structural diff and component-level locking
  • Research & publishing — scientists and authors versioning LaTeX manuscripts, Jupyter notebooks, HDF5 datasets, and FITS astronomical data
  • Database versioning — schema-aware diffing and merging of SQLite databases, Parquet files, CSV datasets, and SQL migration scripts
  • Datacenter-scale deployments — distributed clusters with sharding, replication, health checks, and Prometheus metrics
  • CI/CD pipelines — machine-readable output eliminates fragile text parsing
  • MCP-enabled IDEs — LLM agents operate on repos through tool calls (VS Code, Claude Desktop)
  • Sandboxed builds — run untrusted code in isolated process environments
  • Air-gapped environments — government, defense, critical infrastructure
  • Post-quantum security — organizations preparing for quantum computing threats
  • Git migration — import existing Git repos, export back when needed

At-rest encryption

Objects, the index and packs can be encrypted with AES-256-GCM. Enable it on a new repository by writing .lit/encryption.toml before staging anything:

enabled = true

key_file = "~/.lit/encryption.key"

fips_mode = false

cache_timeout_secs = 900

The passphrase is read from LIT_PASSPHRASE, LIT_PASSPHRASE_FILE, or the cache — never by prompting, since Lit is zero-prompt by design. The key file is created on first use. Without a passphrase the repository stays locked and commands fail rather than falling back to plaintext.

gc packs through the same cipher, so packing an encrypted repository does not put its contents on disk in the clear.

To switch encryption on for a repository that already has commits, write the config and then migrate its existing content:

lit migrate-encryption

That encrypts the loose objects and the index, and expands any pack into encrypted loose objects — gc will pack them again. It is idempotent, so an interrupted run is finished by running it a second time rather than leaving the repository half-converted. Without it, commands fail with suggestions telling you to run it.

Two things worth knowing:

  • Refs and HEAD are not encrypted. write_ref and update_head store them in clear text, so branch and tag names and the commit hashes they point at remain visible on disk even in an encrypted repository. Object contents, commit messages and the index are encrypted; the shape of the history is not.
  • One key derivation per command. PBKDF2 runs 600,000 iterations, which is deliberate and takes a noticeable fraction of a second. A command opens several stores, so the derived key is cached in memory for the life of the process and the cost is paid once rather than once per store. The cache never touches disk, holds only successful derivations — a wrong passphrase still meets the rate limiter — and is keyed by passphrase as well as key file, so rotating within a process cannot hand back a stale key.

Testing

cargo test runs 423 tests across unit, integration, and performance suites:

cargo test                                                       # everything
cargo test --lib -- --test-threads=1                             # 94 unit tests
cargo test --test command_tests -- --test-threads=1              # 249 command tests
cargo test --test feature_integration_test                       # 38 integration tests
cargo test --test performance_benchmarks --release               # 9 benchmarks
cargo test --test adversarial_test -- --test-threads=1           # 6 security tests
cargo test --test concurrency_test -- --test-threads=1           # 9 concurrency tests
cargo test --test network_integration_test -- --test-threads=1   # 14 network tests

The unit tests live in the library. --bin lit has none of its own: the CLI imports from lit:: rather than re-declaring its modules, so nothing is compiled or tested twice.

The benchmarks assert wall-clock budgets written for an optimized build, so the budgets are enforced only when the suite is built with --release. A plain cargo test still runs them and prints each timing, but will not fail on the timing of an unoptimized build. Set LIT_BENCH_SCALE=<n> to widen the budgets for a release run on a slow or heavily loaded machine.

Documentation

License

This software is dual-licensed:

For commercial licensing inquiries, contact: licensing@nervosys.ai

Security

If you discover a security vulnerability, do not open a public issue. See SECURITY.md for responsible disclosure instructions.

For detailed security architecture: docs/SECURITY.md | docs/SECURITY_AUDIT.md

Contributing

See CONTRIBUTING.md for development setup, coding standards, and submission guidelines.

This is a security-focused tool — all contributions must pass CI, include tests, and preserve structured output.