ZeroClaw 🦀

Zero overhead. Zero compromise. 100% Rust. 100% Agnostic.

The fastest, smallest, fully autonomous AI assistant — deploy anywhere, swap anything.

~3MB binary · <10ms startup · 502 tests · 22 providers · Pluggable everything

Quick Start

git clone https://github.com/theonlyhennygod/zeroclaw.git
cd zeroclaw
cargo build --release

# Initialize config + workspace
cargo run --release -- onboard

# Set your API key
export OPENROUTER_API_KEY="sk-..."

# Chat
cargo run --release -- agent -m "Hello, ZeroClaw!"

# Interactive mode
cargo run --release -- agent

# Check status
cargo run --release -- status --verbose

# List tools (includes memory tools)
cargo run --release -- tools list

# Test a tool directly
cargo run --release -- tools test memory_store '{"key": "lang", "content": "User prefers Rust"}'
cargo run --release -- tools test memory_recall '{"query": "Rust"}'

Tip: Run cargo install --path . to install zeroclaw globally, then use zeroclaw instead of cargo run --release --.

Architecture

Every subsystem is a trait — swap implementations with a config change, zero code changes.

Subsystem	Trait	Ships with	Extend
AI Models	Provider	22 providers (OpenRouter, Anthropic, OpenAI, Venice, Groq, Mistral, etc.)	Any OpenAI-compatible API
Channels	Channel	CLI, Telegram, Discord, Slack, iMessage, Matrix, Webhook	Any messaging API
Memory	Memory	SQLite (default), Markdown	Any persistence
Tools	Tool	shell, file_read, file_write, memory_store, memory_recall, memory_forget	Any capability
Observability	Observer	Noop, Log, Multi	Prometheus, OTel
Runtime	RuntimeAdapter	Native (Mac/Linux/Pi)	Docker, WASM
Security	SecurityPolicy	Sandbox + allowlists + rate limits	—
Heartbeat	Engine	HEARTBEAT.md periodic tasks	—

Memory System

ZeroClaw has a built-in brain. The agent automatically:

1. Recalls relevant memories before each prompt (context injection)
2. Saves conversation turns to memory (auto-save)
3. Manages its own memory via tools (store/recall/forget)

Two backends — SQLite (default, searchable, upsert, delete) and Markdown (human-readable, append-only, git-friendly). Switch with one config line.

Security

• Workspace sandboxing — can't escape workspace directory
• Command allowlisting — only approved shell commands
• Path traversal blocking — .. and absolute paths blocked
• Rate limiting — max actions/hour, max cost/day
• Autonomy levels — ReadOnly, Supervised, Full

Configuration

Config: ~/.zeroclaw/config.toml (created by onboard)

Documentation Index

Fetch the complete documentation index at: https://docs.openclaw.ai/llms.txt Use this file to discover all available pages before exploring further.

Token Use & Costs

ZeroClaw tracks tokens, not characters. Tokens are model-specific, but most OpenAI-style models average ~4 characters per token for English text.

How the system prompt is built

ZeroClaw assembles its own system prompt on every run. It includes:

• Tool list + short descriptions
• Skills list (only metadata; instructions are loaded on demand with read)
• Self-update instructions
• Workspace + bootstrap files (AGENTS.md, SOUL.md, TOOLS.md, IDENTITY.md, USER.md, HEARTBEAT.md, BOOTSTRAP.md when new, plus MEMORY.md and/or memory.md when present). Large files are truncated by agents.defaults.bootstrapMaxChars (default: 20000). memory/*.md files are on-demand via memory tools and are not auto-injected.
• Time (UTC + user timezone)
• Reply tags + heartbeat behavior
• Runtime metadata (host/OS/model/thinking)

What counts in the context window

Everything the model receives counts toward the context limit:

• System prompt (all sections listed above)
• Conversation history (user + assistant messages)
• Tool calls and tool results
• Attachments/transcripts (images, audio, files)
• Compaction summaries and pruning artifacts
• Provider wrappers or safety headers (not visible, but still counted)

How to see current token usage

Use these in chat:

• /status → emoji-rich status card with the session model, context usage, last response input/output tokens, and estimated cost (API key only).
• /usage off|tokens|full → appends a per-response usage footer to every reply.
  • Persists per session (stored as responseUsage).
  • OAuth auth hides cost (tokens only).
• /usage cost → shows a local cost summary from ZeroClaw session logs.

Other surfaces:

• TUI/Web TUI: /status + /usage are supported.
• CLI: zeroclaw status --usage and zeroclaw channels list show provider quota windows (not per-response costs).

Cost estimation (when shown)

Costs are estimated from your model pricing config:

models.providers.<provider>.models[].cost

These are USD per 1M tokens for input, output, cacheRead, and cacheWrite. If pricing is missing, ZeroClaw shows tokens only. OAuth tokens never show dollar cost.

Cache TTL and pruning impact

Provider prompt caching only applies within the cache TTL window. ZeroClaw can optionally run cache-ttl pruning: it prunes the session once the cache TTL has expired, then resets the cache window so subsequent requests can re-use the freshly cached context instead of re-caching the full history. This keeps cache write costs lower when a session goes idle past the TTL.

Configure it in Gateway configuration and see the behavior details in Session pruning.

Heartbeat can keep the cache warm across idle gaps. If your model cache TTL is 1h, setting the heartbeat interval just under that (e.g., 55m) can avoid re-caching the full prompt, reducing cache write costs.

For Anthropic API pricing, cache reads are significantly cheaper than input tokens, while cache writes are billed at a higher multiplier. See Anthropic's prompt caching pricing for the latest rates and TTL multipliers: https://docs.anthropic.com/docs/build-with-claude/prompt-caching

Example: keep 1h cache warm with heartbeat

agents:
  defaults:
    model:
      primary: "anthropic/claude-opus-4-6"
    models:
      "anthropic/claude-opus-4-6":
        params:
          cacheRetention: "long"
    heartbeat:
      every: "55m"

Tips for reducing token pressure

• Use /compact to summarize long sessions.
• Trim large tool outputs in your workflows.
• Keep skill descriptions short (skill list is injected into the prompt).
• Prefer smaller models for verbose, exploratory work.

api_key = "sk-..."
default_provider = "openrouter"
default_model = "anthropic/claude-sonnet-4-20250514"
default_temperature = 0.7

[memory]
backend = "sqlite"  # "sqlite", "markdown", "none"
auto_save = true

[autonomy]
level = "supervised"  # "readonly", "supervised", "full"
workspace_only = true
allowed_commands = ["git", "npm", "cargo", "ls", "cat", "grep"]

[heartbeat]
enabled = false
interval_minutes = 30

Commands

Command	Description
onboard	Initialize workspace and config
agent -m "..."	Single message mode
agent	Interactive chat mode
status -v	Show full system status
tools list	List all 6 tools
tools test <name> <json>	Test a tool directly
gateway	Start webhook/WebSocket server

Development

cargo build              # Dev build
cargo build --release    # Release build (~3MB)
cargo test               # 502 tests
cargo clippy             # Lint (0 warnings)

# Run the SQLite vs Markdown benchmark
cargo test --test memory_comparison -- --nocapture

Project Structure

src/
├── main.rs           # CLI (clap)
├── lib.rs            # Library exports
├── agent/            # Agent loop + context injection
├── channels/         # Channel trait + CLI
├── config/           # TOML config schema
├── cron/             # Scheduled tasks
├── heartbeat/        # HEARTBEAT.md engine
├── memory/           # Memory trait + SQLite + Markdown
├── observability/    # Observer trait + Noop/Log/Multi
├── providers/        # Provider trait + 22 providers
├── runtime/          # RuntimeAdapter trait + Native
├── security/         # Sandbox + allowlists + autonomy
└── tools/            # Tool trait + shell/file/memory tools
examples/
├── custom_provider.rs
├── custom_channel.rs
├── custom_tool.rs
└── custom_memory.rs
tests/
└── memory_comparison.rs  # SQLite vs Markdown benchmark

License

MIT — see LICENSE

Contributing

See CONTRIBUTING.md. Implement a trait, submit a PR:

• New Provider → src/providers/
• New Channel → src/channels/
• New Observer → src/observability/
• New Tool → src/tools/
• New Memory → src/memory/

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ZeroClaw — Zero overhead. Zero compromise. Deploy anywhere. Swap anything. 🦀