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PARITY.md and the current Rust CLI UX both pointed at session-management polish as a worthwhile parity lane. The existing /clear flow reset the live REPL without telling the user how to get back, and the resumed /clear path overwrote the saved session file in place with no recovery handle. This change keeps the existing clear semantics but makes them safer and more legible. Live clears now print the previous session id and a resume hint, while resumed clears write a sibling backup before resetting the requested session file and report both the backup path and the new session id. Constraint: Keep /clear compatible with follow-on commands in the same --resume invocation Rejected: Switch resumed /clear to a brand-new primary session path | would break the expected in-place reset semantics for chained resume commands Confidence: high Scope-risk: narrow Directive: Preserve explicit recovery hints in /clear output if session lifecycle behavior changes again Tested: cargo test --manifest-path rust/Cargo.toml -p rusty-claude-cli --test resume_slash_commands Tested: cargo test --manifest-path rust/Cargo.toml -p rusty-claude-cli --bin claw clear_command_requires_explicit_confirmation_flag Not-tested: Manual interactive REPL /clear run
🦞 Claw Code — Rust Implementation
A high-performance Rust rewrite of the Claw Code CLI agent harness. Built for speed, safety, and native tool execution.
Quick Start
# Build
cd rust/
cargo build --release
# Run interactive REPL
./target/release/claw
# One-shot prompt
./target/release/claw prompt "explain this codebase"
# With specific model
./target/release/claw --model sonnet prompt "fix the bug in main.rs"
Configuration
Set your API credentials:
export ANTHROPIC_API_KEY="sk-ant-..."
# Or use a proxy
export ANTHROPIC_BASE_URL="https://your-proxy.com"
Or authenticate via OAuth:
claw login
Features
| Feature | Status |
|---|---|
| Anthropic API + streaming | ✅ |
| OAuth login/logout | ✅ |
| Interactive REPL (rustyline) | ✅ |
| Tool system (bash, read, write, edit, grep, glob) | ✅ |
| Web tools (search, fetch) | ✅ |
| Sub-agent orchestration | ✅ |
| Todo tracking | ✅ |
| Notebook editing | ✅ |
| CLAUDE.md / project memory | ✅ |
| Config file hierarchy (.claude.json) | ✅ |
| Permission system | ✅ |
| MCP server lifecycle | ✅ |
| Session persistence + resume | ✅ |
| Extended thinking (thinking blocks) | ✅ |
| Cost tracking + usage display | ✅ |
| Git integration | ✅ |
| Markdown terminal rendering (ANSI) | ✅ |
| Model aliases (opus/sonnet/haiku) | ✅ |
| Slash commands (/status, /compact, /clear, etc.) | ✅ |
| Hooks (PreToolUse/PostToolUse) | 🔧 Config only |
| Plugin system | 📋 Planned |
| Skills registry | 📋 Planned |
Model Aliases
Short names resolve to the latest model versions:
| Alias | Resolves To |
|---|---|
opus |
claude-opus-4-6 |
sonnet |
claude-sonnet-4-6 |
haiku |
claude-haiku-4-5-20251213 |
CLI Flags
claw [OPTIONS] [COMMAND]
Options:
--model MODEL Set the model (alias or full name)
--dangerously-skip-permissions Skip all permission checks
--permission-mode MODE Set read-only, workspace-write, or danger-full-access
--allowedTools TOOLS Restrict enabled tools
--output-format FORMAT Output format (text or json)
--version, -V Print version info
Commands:
prompt <text> One-shot prompt (non-interactive)
login Authenticate via OAuth
logout Clear stored credentials
init Initialize project config
doctor Check environment health
self-update Update to latest version
Slash Commands (REPL)
Tab completion now expands not just slash command names, but also common workflow arguments like model aliases, permission modes, and recent session IDs.
| Command | Description |
|---|---|
/help |
Show help |
/status |
Show session status (model, tokens, cost) |
/cost |
Show cost breakdown |
/compact |
Compact conversation history |
/clear |
Clear conversation |
/model [name] |
Show or switch model |
/permissions |
Show or switch permission mode |
/config [section] |
Show config (env, hooks, model) |
/memory |
Show CLAUDE.md contents |
/diff |
Show git diff |
/export [path] |
Export conversation |
/session [id] |
Resume a previous session |
/version |
Show version |
Workspace Layout
rust/
├── Cargo.toml # Workspace root
├── Cargo.lock
└── crates/
├── api/ # Anthropic API client + SSE streaming
├── commands/ # Shared slash-command registry
├── compat-harness/ # TS manifest extraction harness
├── runtime/ # Session, config, permissions, MCP, prompts
├── rusty-claude-cli/ # Main CLI binary (`claw`)
└── tools/ # Built-in tool implementations
Crate Responsibilities
- api — HTTP client, SSE stream parser, request/response types, auth (API key + OAuth bearer)
- commands — Slash command definitions and help text generation
- compat-harness — Extracts tool/prompt manifests from upstream TS source
- runtime —
ConversationRuntimeagentic loop,ConfigLoaderhierarchy,Sessionpersistence, permission policy, MCP client, system prompt assembly, usage tracking - rusty-claude-cli — REPL, one-shot prompt, streaming display, tool call rendering, CLI argument parsing
- tools — Tool specs + execution: Bash, ReadFile, WriteFile, EditFile, GlobSearch, GrepSearch, WebSearch, WebFetch, Agent, TodoWrite, NotebookEdit, Skill, ToolSearch, REPL runtimes
Stats
- ~20K lines of Rust
- 6 crates in workspace
- Binary name:
claw - Default model:
claude-opus-4-6 - Default permissions:
danger-full-access
License
See repository root.