Crate clash 

Clash library — permission enforcement for Claude Code.

This crate provides the core building blocks for evaluating tool permissions, enforcing sandbox policies, and integrating with Claude Code’s hook system.

Modules

• hooks — Input/output types for the Claude Code hook protocol.
• permissions — Policy-based permission evaluation for tool invocations.
• policy — Policy YAML language, compilation, and evaluation engine.
• handlers — Pre-built hook handlers that wire permissions, notifications, and session validation together.
• settings — Loading and resolving clash configuration and policy files.
• policy_loader — Policy file discovery, Starlark evaluation, and compilation.
• sandbox — Platform-specific (Linux/macOS) sandbox enforcement backends.
• audit — Structured audit logging of policy decisions.
• notifications — Desktop notifications and Zulip integration.

Example

use clash::hooks::ToolUseHookInput;
use clash::permissions::check_permission;
use clash::settings::ClashSettings;

let settings = ClashSettings::load_or_create().unwrap();
let input = ToolUseHookInput::from_reader(std::io::stdin().lock()).unwrap();
let output = check_permission(&input, &settings).unwrap();
output.write_stdout().unwrap();

Modules

agents

Multi-agent support for Clash.

audit

Structured audit logging for policy decisions.

claude

Claude Code tool definitions and input schemas.

cli

cmd

debug

Debug tools for understanding and inspecting clash policy enforcement.

dialog

Interactive prompt helpers wrapping dialoguer.

display

Shared formatting helpers for human-readable and JSON policy output.

errors

User-facing error display.

git

Git worktree detection.

handlers

Pre-built hook handlers for Claude Code integration.

hooks

network_hints

Detect network errors in sandboxed Bash output and provide actionable hints.

notifications

permissions

policy

Match-tree policy language.

policy_loader

Policy discovery, evaluation, and compilation.

sandbox

Sandbox enforcement backends.

sandbox_cmd

sandbox_hints

Detect filesystem errors in sandboxed Bash output and provide actionable hints.

schema

Self-describing schema for the policy format.

session_dir

Typed handle for a clash session directory.

session_policy

Detect permission acceptances and suggest session-level policy rules.

settings

Loading and resolving clash configuration and policy files.

shell_cmd

clash shell — bash-compatible shell with per-command sandbox enforcement.

style

TTY-aware color and styling helpers for human-friendly CLI output.

trace

Toolpath-based session tracing.

trace_display

Interactive decision trace visualization for clash explain --trace.

tracing_init

tui

Interactive policy editor TUI.

ui

Terminal output helpers — everything that talks to stdout/stderr.

version

Macros

select_enum

Declare an enum that implements SelectItem for use with select.