---
summary: "Hooks: event-driven automation for commands and lifecycle events"
read_when:
  - You want event-driven automation for /new, /reset, /stop, and koi lifecycle events
  - You want to build, install, or debug hooks
title: "Hooks"
---

# Hooks

Hooks provide an extensible event-driven system for automating actions in response to koi commands and events. Hooks are automatically discovered from directories and can be managed via CLI commands, similar to how skills work in SKYKOI.

## Getting Oriented

Hooks are small scripts that run when something happens. There are two kinds:

- **Hooks** (this page): run inside the Gateway when koi events fire, like `/new`, `/reset`, `/stop`, or lifecycle events.
- **Webhooks**: external HTTP webhooks that let other systems trigger work in SKYKOI. See [Webhook Hooks](/automation/webhook) or use `SKYKOI webhooks` for Gmail helper commands.

Hooks can also be bundled inside plugins; see [Plugins](/tools/plugin#plugin-hooks).

Common uses:

- Save a memory snapshot when you reset a session
- Keep an audit trail of commands for troubleshooting or compliance
- Trigger follow-up automation when a session starts or ends
- Write files into the koi workspace or call external APIs when events fire

If you can write a small TypeScript function, you can write a hook. Hooks are discovered automatically, and you enable or disable them via the CLI.

## Overview

The hooks system allows you to:

- Save session context to memory when `/new` is issued
- Log all commands for auditing
- Trigger custom automations on koi lifecycle events
- Extend SKYKOI's behavior without modifying core code

## Getting Started

### Bundled Hooks

SKYKOI ships with four bundled hooks that are automatically discovered:

- **💾 session-memory**: Saves session context to your koi workspace (default `~/.SKYKOI/workspace/memory/`) when you issue `/new`
- **📝 command-logger**: Logs all command events to `~/.SKYKOI/logs/commands.log`
- **🚀 boot-md**: Runs `BOOT.md` when the gateway starts (requires internal hooks enabled)
- **😈 soul-evil**: Swaps injected `SOUL.md` content with `SOUL_EVIL.md` during a purge window or by random chance

List available hooks:

```bash
SKYKOI hooks list
```

Enable a hook:

```bash
SKYKOI hooks enable session-memory
```

Check hook status:

```bash
SKYKOI hooks check
```

Get detailed information:

```bash
SKYKOI hooks info session-memory
```

### Onboarding

During onboarding (`SKYKOI onboard`), you'll be prompted to enable recommended hooks. The wizard automatically discovers eligible hooks and presents them for selection.

## Hook Discovery

Hooks are automatically discovered from three directories (in order of precedence):

1. **Workspace hooks**: `<workspace>/hooks/` (per-koi, highest precedence)
2. **Managed hooks**: `~/.SKYKOI/hooks/` (user-installed, shared across workspaces)
3. **Bundled hooks**: `<SKYKOI>/dist/hooks/bundled/` (shipped with SKYKOI)

Managed hook directories can be either a **single hook** or a **hook pack** (package directory).

Each hook is a directory containing:

```
my-hook/
├── HOOK.md          # Metadata + documentation
└── handler.ts       # Handler implementation
```

## Hook Packs (npm/archives)

Hook packs are standard npm packages that export one or more hooks via `SKYKOI.hooks` in
`package.json`. Install them with:

```bash
SKYKOI hooks install <path-or-spec>
```

Example `package.json`:

```json
{
  "name": "@acme/my-hooks",
  "version": "0.1.0",
  "SKYKOI": {
    "hooks": ["./hooks/my-hook", "./hooks/other-hook"]
  }
}
```

Each entry points to a hook directory containing `HOOK.md` and `handler.ts` (or `index.ts`).
Hook packs can ship dependencies; they will be installed under `~/.SKYKOI/hooks/<id>`.

## Hook Structure

### HOOK.md Format

The `HOOK.md` file contains metadata in YAML frontmatter plus Markdown documentation:

```markdown
---
name: my-hook
description: "Short description of what this hook does"
homepage: https://docs.SKYKOI.com/hooks#my-hook
metadata:
  { "SKYKOI": { "emoji": "🔗", "events": ["command:new"], "requires": { "bins": ["node"] } } }
---

# My Hook

Detailed documentation goes here...

## What It Does

- Listens for `/new` commands
- Performs some action
- Logs the result

## Requirements

- Node.js must be installed

## Configuration

No configuration needed.
```

### Metadata Fields

The `metadata.SKYKOI` object supports:

- **`emoji`**: Display emoji for CLI (e.g., `"💾"`)
- **`events`**: Array of events to listen for (e.g., `["command:new", "command:reset"]`)
- **`export`**: Named export to use (defaults to `"default"`)
- **`homepage`**: Documentation URL
- **`requires`**: Optional requirements
  - **`bins`**: Required binaries on PATH (e.g., `["git", "node"]`)
  - **`anyBins`**: At least one of these binaries must be present
  - **`env`**: Required environment variables
  - **`config`**: Required config paths (e.g., `["workspace.dir"]`)
  - **`os`**: Required platforms (e.g., `["darwin", "linux"]`)
- **`always`**: Bypass eligibility checks (boolean)
- **`install`**: Installation methods (for bundled hooks: `[{"id":"bundled","kind":"bundled"}]`)

### Handler Implementation

The `handler.ts` file exports a `HookHandler` function:

```typescript
import type { HookHandler } from "../../src/hooks/hooks.js";

const myHandler: HookHandler = async (event) => {
  // Only trigger on 'new' command
  if (event.type !== "command" || event.action !== "new") {
    return;
  }

  console.log(`[my-hook] New command triggered`);
  console.log(`  Session: ${event.sessionKey}`);
  console.log(`  Timestamp: ${event.timestamp.toISOString()}`);

  // Your custom logic here

  // Optionally send message to user
  event.messages.push("✨ My hook executed!");
};

export default myHandler;
```

#### Event Context

Each event includes:

```typescript
{
  type: 'command' | 'session' | 'koi' | 'gateway',
  action: string,              // e.g., 'new', 'reset', 'stop'
  sessionKey: string,          // Session identifier
  timestamp: Date,             // When the event occurred
  messages: string[],          // Push messages here to send to user
  context: {
    sessionEntry?: SessionEntry,
    sessionId?: string,
    sessionFile?: string,
    commandSource?: string,    // e.g., 'whatsapp', 'telegram'
    senderId?: string,
    workspaceDir?: string,
    bootstrapFiles?: WorkspaceBootstrapFile[],
    cfg?: SKYKOIConfig
  }
}
```

## Event Types

### Command Events

Triggered when koi commands are issued:

- **`command`**: All command events (general listener)
- **`command:new`**: When `/new` command is issued
- **`command:reset`**: When `/reset` command is issued
- **`command:stop`**: When `/stop` command is issued

### Koi Events

- **`koi:bootstrap`**: Before workspace bootstrap files are injected (hooks may mutate `context.bootstrapFiles`)

### Gateway Events

Triggered when the gateway starts:

- **`gateway:startup`**: After channels start and hooks are loaded

### Tool Result Hooks (Plugin API)

These hooks are not event-stream listeners; they let plugins synchronously adjust tool results before SKYKOI persists them.

- **`tool_result_persist`**: transform tool results before they are written to the session transcript. Must be synchronous; return the updated tool result payload or `undefined` to keep it as-is. See [Koi Loop](/concepts/koi-loop).

### Future Events

Planned event types:

- **`session:start`**: When a new session begins
- **`session:end`**: When a session ends
- **`koi:error`**: When an koi encounters an error
- **`message:sent`**: When a message is sent
- **`message:received`**: When a message is received

## Creating Custom Hooks

### 1. Choose Location

- **Workspace hooks** (`<workspace>/hooks/`): Per-koi, highest precedence
- **Managed hooks** (`~/.SKYKOI/hooks/`): Shared across workspaces

### 2. Create Directory Structure

```bash
mkdir -p ~/.SKYKOI/hooks/my-hook
cd ~/.SKYKOI/hooks/my-hook
```

### 3. Create HOOK.md

```markdown
---
name: my-hook
description: "Does something useful"
metadata: { "SKYKOI": { "emoji": "🎯", "events": ["command:new"] } }
---

# My Custom Hook

This hook does something useful when you issue `/new`.
```

### 4. Create handler.ts

```typescript
import type { HookHandler } from "../../src/hooks/hooks.js";

const handler: HookHandler = async (event) => {
  if (event.type !== "command" || event.action !== "new") {
    return;
  }

  console.log("[my-hook] Running!");
  // Your logic here
};

export default handler;
```

### 5. Enable and Test

```bash
# Verify hook is discovered
SKYKOI hooks list

# Enable it
SKYKOI hooks enable my-hook

# Restart your gateway process (menu bar app restart on macOS, or restart your dev process)

# Trigger the event
# Send /new via your messaging channel
```

## Configuration

### New Config Format (Recommended)

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "entries": {
        "session-memory": { "enabled": true },
        "command-logger": { "enabled": false }
      }
    }
  }
}
```

### Per-Hook Configuration

Hooks can have custom configuration:

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "entries": {
        "my-hook": {
          "enabled": true,
          "env": {
            "MY_CUSTOM_VAR": "value"
          }
        }
      }
    }
  }
}
```

### Extra Directories

Load hooks from additional directories:

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "load": {
        "extraDirs": ["/path/to/more/hooks"]
      }
    }
  }
}
```

### Legacy Config Format (Still Supported)

The old config format still works for backwards compatibility:

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "handlers": [
        {
          "event": "command:new",
          "module": "./hooks/handlers/my-handler.ts",
          "export": "default"
        }
      ]
    }
  }
}
```

**Migration**: Use the new discovery-based system for new hooks. Legacy handlers are loaded after directory-based hooks.

## CLI Commands

### List Hooks

```bash
# List all hooks
SKYKOI hooks list

# Show only eligible hooks
SKYKOI hooks list --eligible

# Verbose output (show missing requirements)
SKYKOI hooks list --verbose

# JSON output
SKYKOI hooks list --json
```

### Hook Information

```bash
# Show detailed info about a hook
SKYKOI hooks info session-memory

# JSON output
SKYKOI hooks info session-memory --json
```

### Check Eligibility

```bash
# Show eligibility summary
SKYKOI hooks check

# JSON output
SKYKOI hooks check --json
```

### Enable/Disable

```bash
# Enable a hook
SKYKOI hooks enable session-memory

# Disable a hook
SKYKOI hooks disable command-logger
```

## Bundled hook reference

### session-memory

Saves session context to memory when you issue `/new`.

**Events**: `command:new`

**Requirements**: `workspace.dir` must be configured

**Output**: `<workspace>/memory/YYYY-MM-DD-slug.md` (defaults to `~/.SKYKOI/workspace`)

**What it does**:

1. Uses the pre-reset session entry to locate the correct transcript
2. Extracts the last 15 lines of conversation
3. Uses LLM to generate a descriptive filename slug
4. Saves session metadata to a dated memory file

**Example output**:

```markdown
# Session: 2026-01-16 14:30:00 UTC

- **Session Key**: koi:main:main
- **Session ID**: abc123def456
- **Source**: telegram
```

**Filename examples**:

- `2026-01-16-vendor-pitch.md`
- `2026-01-16-api-design.md`
- `2026-01-16-1430.md` (fallback timestamp if slug generation fails)

**Enable**:

```bash
SKYKOI hooks enable session-memory
```

### command-logger

Logs all command events to a centralized audit file.

**Events**: `command`

**Requirements**: None

**Output**: `~/.SKYKOI/logs/commands.log`

**What it does**:

1. Captures event details (command action, timestamp, session key, sender ID, source)
2. Appends to log file in JSONL format
3. Runs silently in the background

**Example log entries**:

```jsonl
{"timestamp":"2026-01-16T14:30:00.000Z","action":"new","sessionKey":"koi:main:main","senderId":"+1234567890","source":"telegram"}
{"timestamp":"2026-01-16T15:45:22.000Z","action":"stop","sessionKey":"koi:main:main","senderId":"user@example.com","source":"whatsapp"}
```

**View logs**:

```bash
# View recent commands
tail -n 20 ~/.SKYKOI/logs/commands.log

# Pretty-print with jq
cat ~/.SKYKOI/logs/commands.log | jq .

# Filter by action
grep '"action":"new"' ~/.SKYKOI/logs/commands.log | jq .
```

**Enable**:

```bash
SKYKOI hooks enable command-logger
```

### soul-evil

Swaps injected `SOUL.md` content with `SOUL_EVIL.md` during a purge window or by random chance.

**Events**: `koi:bootstrap`

**Docs**: [SOUL Evil Hook](/hooks/soul-evil)

**Output**: No files written; swaps happen in-memory only.

**Enable**:

```bash
SKYKOI hooks enable soul-evil
```

**Config**:

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "entries": {
        "soul-evil": {
          "enabled": true,
          "file": "SOUL_EVIL.md",
          "chance": 0.1,
          "purge": { "at": "21:00", "duration": "15m" }
        }
      }
    }
  }
}
```

### boot-md

Runs `BOOT.md` when the gateway starts (after channels start).
Internal hooks must be enabled for this to run.

**Events**: `gateway:startup`

**Requirements**: `workspace.dir` must be configured

**What it does**:

1. Reads `BOOT.md` from your workspace
2. Runs the instructions via the koi runner
3. Sends any requested outbound messages via the message tool

**Enable**:

```bash
SKYKOI hooks enable boot-md
```

## Best Practices

### Keep Handlers Fast

Hooks run during command processing. Keep them lightweight:

```typescript
// ✓ Good - async work, returns immediately
const handler: HookHandler = async (event) => {
  void processInBackground(event); // Fire and forget
};

// ✗ Bad - blocks command processing
const handler: HookHandler = async (event) => {
  await slowDatabaseQuery(event);
  await evenSlowerAPICall(event);
};
```

### Handle Errors Gracefully

Always wrap risky operations:

```typescript
const handler: HookHandler = async (event) => {
  try {
    await riskyOperation(event);
  } catch (err) {
    console.error("[my-handler] Failed:", err instanceof Error ? err.message : String(err));
    // Don't throw - let other handlers run
  }
};
```

### Filter Events Early

Return early if the event isn't relevant:

```typescript
const handler: HookHandler = async (event) => {
  // Only handle 'new' commands
  if (event.type !== "command" || event.action !== "new") {
    return;
  }

  // Your logic here
};
```

### Use Specific Event Keys

Specify exact events in metadata when possible:

```yaml
metadata: { "SKYKOI": { "events": ["command:new"] } } # Specific
```

Rather than:

```yaml
metadata: { "SKYKOI": { "events": ["command"] } } # General - more overhead
```

## Debugging

### Enable Hook Logging

The gateway logs hook loading at startup:

```
Registered hook: session-memory -> command:new
Registered hook: command-logger -> command
Registered hook: boot-md -> gateway:startup
```

### Check Discovery

List all discovered hooks:

```bash
SKYKOI hooks list --verbose
```

### Check Registration

In your handler, log when it's called:

```typescript
const handler: HookHandler = async (event) => {
  console.log("[my-handler] Triggered:", event.type, event.action);
  // Your logic
};
```

### Verify Eligibility

Check why a hook isn't eligible:

```bash
SKYKOI hooks info my-hook
```

Look for missing requirements in the output.

## Testing

### Gateway Logs

Monitor gateway logs to see hook execution:

```bash
# macOS
./scripts/clawlog.sh -f

# Other platforms
tail -f ~/.SKYKOI/gateway.log
```

### Test Hooks Directly

Test your handlers in isolation:

```typescript
import { test } from "vitest";
import { createHookEvent } from "./src/hooks/hooks.js";
import myHandler from "./hooks/my-hook/handler.js";

test("my handler works", async () => {
  const event = createHookEvent("command", "new", "test-session", {
    foo: "bar",
  });

  await myHandler(event);

  // Assert side effects
});
```

## Architecture

### Core Components

- **`src/hooks/types.ts`**: Type definitions
- **`src/hooks/workspace.ts`**: Directory scanning and loading
- **`src/hooks/frontmatter.ts`**: HOOK.md metadata parsing
- **`src/hooks/config.ts`**: Eligibility checking
- **`src/hooks/hooks-status.ts`**: Status reporting
- **`src/hooks/loader.ts`**: Dynamic module loader
- **`src/cli/hooks-cli.ts`**: CLI commands
- **`src/gateway/server-startup.ts`**: Loads hooks at gateway start
- **`src/auto-reply/reply/commands-core.ts`**: Triggers command events

### Discovery Flow

```
Gateway startup
    ↓
Scan directories (workspace → managed → bundled)
    ↓
Parse HOOK.md files
    ↓
Check eligibility (bins, env, config, os)
    ↓
Load handlers from eligible hooks
    ↓
Register handlers for events
```

### Event Flow

```
User sends /new
    ↓
Command validation
    ↓
Create hook event
    ↓
Trigger hook (all registered handlers)
    ↓
Command processing continues
    ↓
Session reset
```

## Troubleshooting

### Hook Not Discovered

1. Check directory structure:

   ```bash
   ls -la ~/.SKYKOI/hooks/my-hook/
   # Should show: HOOK.md, handler.ts
   ```

2. Verify HOOK.md format:

   ```bash
   cat ~/.SKYKOI/hooks/my-hook/HOOK.md
   # Should have YAML frontmatter with name and metadata
   ```

3. List all discovered hooks:

   ```bash
   SKYKOI hooks list
   ```

### Hook Not Eligible

Check requirements:

```bash
SKYKOI hooks info my-hook
```

Look for missing:

- Binaries (check PATH)
- Environment variables
- Config values
- OS compatibility

### Hook Not Executing

1. Verify hook is enabled:

   ```bash
   SKYKOI hooks list
   # Should show ✓ next to enabled hooks
   ```

2. Restart your gateway process so hooks reload.

3. Check gateway logs for errors:

   ```bash
   ./scripts/clawlog.sh | grep hook
   ```

### Handler Errors

Check for TypeScript/import errors:

```bash
# Test import directly
node -e "import('./path/to/handler.ts').then(console.log)"
```

## Migration Guide

### From Legacy Config to Discovery

**Before**:

```json
{
  "hooks": {
    "internal": {
      "enabled": true,
      "handlers": [
        {
          "event": "command:new",
          "module": "./hooks/handlers/my-handler.ts"
        }
      ]
    }
  }
}
```

**After**:

1. Create hook directory:

   ```bash
   mkdir -p ~/.SKYKOI/hooks/my-hook
   mv ./hooks/handlers/my-handler.ts ~/.SKYKOI/hooks/my-hook/handler.ts
   ```

2. Create HOOK.md:

   ```markdown
   ---
   name: my-hook
   description: "My custom hook"
   metadata: { "SKYKOI": { "emoji": "🎯", "events": ["command:new"] } }
   ---

   # My Hook

   Does something useful.
   ```

3. Update config:

   ```json
   {
     "hooks": {
       "internal": {
         "enabled": true,
         "entries": {
           "my-hook": { "enabled": true }
         }
       }
     }
   }
   ```

4. Verify and restart your gateway process:

   ```bash
   SKYKOI hooks list
   # Should show: 🎯 my-hook ✓
   ```

**Benefits of migration**:

- Automatic discovery
- CLI management
- Eligibility checking
- Better documentation
- Consistent structure

## See Also

- [CLI Reference: hooks](/cli/hooks)
- [Bundled Hooks README](https://github.com/SKYKOI/SKYKOI/tree/main/src/hooks/bundled)
- [Webhook Hooks](/automation/webhook)
- [Configuration](/gateway/configuration#hooks)