# Claw Code Usage

This guide covers the current Rust workspace under `rust/` and the `claw` CLI binary. If you are brand new, make the doctor health check your first run: start `claw`, then run `/doctor`.

## Quick-start health check

Run this before prompts, sessions, or automation:

```bash
cd rust
cargo build --workspace
./target/debug/claw
# first command inside the REPL
/doctor
```

`/doctor` is the built-in setup and preflight diagnostic. Once you have a saved session, you can rerun it with `./target/debug/claw --resume latest /doctor`.

## Prerequisites

- Rust toolchain with `cargo`
- One of:
  - `ANTHROPIC_API_KEY` for direct API access
  - `claw login` for OAuth-based auth
- Optional: `ANTHROPIC_BASE_URL` when targeting a proxy or local service

## Install / build the workspace

```bash
cd rust
cargo build --workspace
```

The CLI binary is available at `rust/target/debug/claw` after a debug build. Make the doctor check above your first post-build step.

## Quick start

### First-run doctor check

```bash
cd rust
./target/debug/claw
/doctor
```

### Interactive REPL

```bash
cd rust
./target/debug/claw
```

### One-shot prompt

```bash
cd rust
./target/debug/claw prompt "summarize this repository"
```

### Shorthand prompt mode

```bash
cd rust
./target/debug/claw "explain rust/crates/runtime/src/lib.rs"
```

### JSON output for scripting

```bash
cd rust
./target/debug/claw --output-format json prompt "status"
```

## Model and permission controls

```bash
cd rust
./target/debug/claw --model sonnet prompt "review this diff"
./target/debug/claw --permission-mode read-only prompt "summarize Cargo.toml"
./target/debug/claw --permission-mode workspace-write prompt "update README.md"
./target/debug/claw --allowedTools read,glob "inspect the runtime crate"
```

Supported permission modes:

- `read-only`
- `workspace-write`
- `danger-full-access`

Model aliases currently supported by the CLI:

- `opus` → `claude-opus-4-6`
- `sonnet` → `claude-sonnet-4-6`
- `haiku` → `claude-haiku-4-5-20251213`

## Authentication

### API key

```bash
export ANTHROPIC_API_KEY="sk-ant-..."
```

### OAuth

```bash
cd rust
./target/debug/claw login
./target/debug/claw logout
```

## Local Models

`claw` can talk to local servers and provider gateways through either Anthropic-compatible or OpenAI-compatible endpoints. Use `ANTHROPIC_BASE_URL` with `ANTHROPIC_AUTH_TOKEN` for Anthropic-compatible services, or `OPENAI_BASE_URL` with `OPENAI_API_KEY` for OpenAI-compatible services. OAuth is Anthropic-only, so when `OPENAI_BASE_URL` is set you should use API-key style auth instead of `claw login`.

### Anthropic-compatible endpoint

```bash
export ANTHROPIC_BASE_URL="http://127.0.0.1:8080"
export ANTHROPIC_AUTH_TOKEN="local-dev-token"

cd rust
./target/debug/claw --model "claude-sonnet-4-6" prompt "reply with the word ready"
```

### OpenAI-compatible endpoint

```bash
export OPENAI_BASE_URL="http://127.0.0.1:8000/v1"
export OPENAI_API_KEY="local-dev-token"

cd rust
./target/debug/claw --model "qwen2.5-coder" prompt "reply with the word ready"
```

### Ollama

```bash
export OPENAI_BASE_URL="http://127.0.0.1:11434/v1"
unset OPENAI_API_KEY

cd rust
./target/debug/claw --model "llama3.2" prompt "summarize this repository in one sentence"
```

### OpenRouter

```bash
export OPENAI_BASE_URL="https://openrouter.ai/api/v1"
export OPENAI_API_KEY="sk-or-v1-..."

cd rust
./target/debug/claw --model "openai/gpt-4.1-mini" prompt "summarize this repository in one sentence"
```

## Supported Providers & Models

`claw` has three built-in provider backends. The provider is selected automatically based on the model name, falling back to whichever credential is present in the environment.

### Provider matrix

| Provider | Protocol | Auth env var(s) | Base URL env var | Default base URL |
|---|---|---|---|---|
| **Anthropic** (direct) | Anthropic Messages API | `ANTHROPIC_API_KEY` or `ANTHROPIC_AUTH_TOKEN` or OAuth (`claw login`) | `ANTHROPIC_BASE_URL` | `https://api.anthropic.com` |
| **xAI** | OpenAI-compatible | `XAI_API_KEY` | `XAI_BASE_URL` | `https://api.x.ai/v1` |
| **OpenAI-compatible** | OpenAI Chat Completions | `OPENAI_API_KEY` | `OPENAI_BASE_URL` | `https://api.openai.com/v1` |

The OpenAI-compatible backend also serves as the gateway for **OpenRouter**, **Ollama**, and any other service that speaks the OpenAI `/v1/chat/completions` wire format — just point `OPENAI_BASE_URL` at the service.

### Tested models and aliases

These are the models registered in the built-in alias table with known token limits:

| Alias | Resolved model name | Provider | Max output tokens | Context window |
|---|---|---|---|---|
| `opus` | `claude-opus-4-6` | Anthropic | 32 000 | 200 000 |
| `sonnet` | `claude-sonnet-4-6` | Anthropic | 64 000 | 200 000 |
| `haiku` | `claude-haiku-4-5-20251213` | Anthropic | 64 000 | 200 000 |
| `grok` / `grok-3` | `grok-3` | xAI | 64 000 | 131 072 |
| `grok-mini` / `grok-3-mini` | `grok-3-mini` | xAI | 64 000 | 131 072 |
| `grok-2` | `grok-2` | xAI | — | — |

Any model name that does not match an alias is passed through verbatim. This is how you use OpenRouter model slugs (`openai/gpt-4.1-mini`), Ollama tags (`llama3.2`), or full Anthropic model IDs (`claude-sonnet-4-20250514`).

### User-defined aliases

You can add custom aliases in any settings file (`~/.claw/settings.json`, `.claw/settings.json`, or `.claw/settings.local.json`):

```json
{
  "aliases": {
    "fast": "claude-haiku-4-5-20251213",
    "smart": "claude-opus-4-6",
    "cheap": "grok-3-mini"
  }
}
```

Local project settings override user-level settings. Aliases resolve through the built-in table, so `"fast": "haiku"` also works.

### How provider detection works

1. If the resolved model name starts with `claude` → Anthropic.
2. If it starts with `grok` → xAI.
3. Otherwise, `claw` checks which credential is set: `ANTHROPIC_API_KEY`/`ANTHROPIC_AUTH_TOKEN` first, then `OPENAI_API_KEY`, then `XAI_API_KEY`.
4. If nothing matches, it defaults to Anthropic.

## FAQ

### What about Codex?

The name "codex" appears in the Claw Code ecosystem but it does **not** refer to OpenAI Codex (the code-generation model). Here is what it means in this project:

- **`oh-my-codex` (OmX)** is the workflow and plugin layer that sits on top of `claw`. It provides planning modes, parallel multi-agent execution, notification routing, and other automation features. See [PHILOSOPHY.md](./PHILOSOPHY.md) and the [oh-my-codex repo](https://github.com/Yeachan-Heo/oh-my-codex).
- **`.codex/` directories** (e.g. `.codex/skills`, `.codex/agents`, `.codex/commands`) are legacy lookup paths that `claw` still scans alongside the primary `.claw/` directories.
- **`CODEX_HOME`** is an optional environment variable that points to a custom root for user-level skill and command lookups.

`claw` does **not** support OpenAI Codex sessions, the Codex CLI, or Codex session import/export. If you need to use OpenAI models (like GPT-4.1), configure the OpenAI-compatible provider as shown above in the [OpenAI-compatible endpoint](#openai-compatible-endpoint) and [OpenRouter](#openrouter) sections.

## HTTP proxy support

`claw` honours the standard `HTTP_PROXY`, `HTTPS_PROXY`, and `NO_PROXY` environment variables (both upper- and lower-case spellings are accepted) when issuing outbound requests to Anthropic, OpenAI-, and xAI-compatible endpoints. Set them before launching the CLI and the underlying `reqwest` client will be configured automatically.

### Environment variables

```bash
export HTTPS_PROXY="http://proxy.corp.example:3128"
export HTTP_PROXY="http://proxy.corp.example:3128"
export NO_PROXY="localhost,127.0.0.1,.corp.example"

cd rust
./target/debug/claw prompt "hello via the corporate proxy"
```

### Programmatic `proxy_url` config option

As an alternative to per-scheme environment variables, the `ProxyConfig` type exposes a `proxy_url` field that acts as a single catch-all proxy for both HTTP and HTTPS traffic. When `proxy_url` is set it takes precedence over the separate `http_proxy` and `https_proxy` fields.

```rust
use api::{build_http_client_with, ProxyConfig};

// From a single unified URL (config file, CLI flag, etc.)
let config = ProxyConfig::from_proxy_url("http://proxy.corp.example:3128");
let client = build_http_client_with(&config).expect("proxy client");

// Or set the field directly alongside NO_PROXY
let config = ProxyConfig {
    proxy_url: Some("http://proxy.corp.example:3128".to_string()),
    no_proxy: Some("localhost,127.0.0.1".to_string()),
    ..ProxyConfig::default()
};
let client = build_http_client_with(&config).expect("proxy client");
```

### Notes

- When both `HTTPS_PROXY` and `HTTP_PROXY` are set, the secure proxy applies to `https://` URLs and the plain proxy applies to `http://` URLs.
- `proxy_url` is a unified alternative: when set, it applies to both `http://` and `https://` destinations, overriding the per-scheme fields.
- `NO_PROXY` accepts a comma-separated list of host suffixes (for example `.corp.example`) and IP literals.
- Empty values are treated as unset, so leaving `HTTPS_PROXY=""` in your shell will not enable a proxy.
- If a proxy URL cannot be parsed, `claw` falls back to a direct (no-proxy) client so existing workflows keep working; double-check the URL if you expected the request to be tunnelled.

## Common operational commands

```bash
cd rust
./target/debug/claw status
./target/debug/claw sandbox
./target/debug/claw agents
./target/debug/claw mcp
./target/debug/claw skills
./target/debug/claw system-prompt --cwd .. --date 2026-04-04
```

## Session management

REPL turns are persisted under `.claw/sessions/` in the current workspace.

```bash
cd rust
./target/debug/claw --resume latest
./target/debug/claw --resume latest /status /diff
```

Useful interactive commands include `/help`, `/status`, `/cost`, `/config`, `/session`, `/model`, `/permissions`, and `/export`.

## Config file resolution order

Runtime config is loaded in this order, with later entries overriding earlier ones:

1. `~/.claw.json`
2. `~/.config/claw/settings.json`
3. `<repo>/.claw.json`
4. `<repo>/.claw/settings.json`
5. `<repo>/.claw/settings.local.json`

## Mock parity harness

The workspace includes a deterministic Anthropic-compatible mock service and parity harness.

```bash
cd rust
./scripts/run_mock_parity_harness.sh
```

Manual mock service startup:

```bash
cd rust
cargo run -p mock-anthropic-service -- --bind 127.0.0.1:0
```

## Verification

```bash
cd rust
cargo test --workspace
```

## Workspace overview

Current Rust crates:

- `api`
- `commands`
- `compat-harness`
- `mock-anthropic-service`
- `plugins`
- `runtime`
- `rusty-claude-cli`
- `telemetry`
- `tools`