elevenlabs-agents skill

---
name: elevenlabs-agents
description: |
  Build conversational AI voice agents with ElevenLabs Platform. Configure agents, tools, RAG knowledge bases, agent versioning with A/B testing, and MCP security. React, React Native, or Swift SDKs. Prevents 34 documented errors.

  Use when: building voice agents, AI phone systems, agent versioning/branching, MCP security, or troubleshooting @11labs deprecated, webhook errors, CSP violations, localhost allowlist, tool parsing errors.
user-invocable: true
---

# ElevenLabs Agents Platform

## Overview

ElevenLabs Agents Platform is a comprehensive solution for building production-ready conversational AI voice agents. The platform coordinates four core components:

1. **ASR (Automatic Speech Recognition)** - Converts speech to text (32+ languages, sub-second latency)
2. **LLM (Large Language Model)** - Reasoning and response generation (GPT, Claude, Gemini, custom models)
3. **TTS (Text-to-Speech)** - Converts text to speech (5000+ voices, 31 languages, low latency)
4. **Turn-Taking Model** - Proprietary model that handles conversation timing and interruptions

### 🚨 Package Updates (January 2026)

ElevenLabs migrated to new scoped packages in August 2025. **Current packages:**

```bash
npm install @elevenlabs/[email protected]           # React SDK (Dec 2025: localization, Scribe fixes)
npm install @elevenlabs/[email protected]          # JavaScript SDK (Dec 2025: localization)
npm install @elevenlabs/[email protected]     # React Native SDK (Dec 2025: mic fixes, speed param)
npm install @elevenlabs/[email protected]   # Base SDK (Jan 2026: latest)
npm install -g @elevenlabs/[email protected]    # CLI
```

**DEPRECATED:** `@11labs/react`, `@11labs/client` (uninstall if present)

**⚠️ CRITICAL:** v1 TTS models were removed on 2025-12-15. Use Turbo v2/v2.5 only.

### December 2025 Updates

**Widget Improvements (v0.5.5)**:
- Microphone permission handling improvements (better UX for permission requests)
- Text-only mode (`chat_mode: true`) no longer requires microphone access
- `end_call` system tool fix (no longer omits last message)

**SDK Fixes**:
- Scribe audio format parameter now correctly transmitted (v2.32.0, Jan 2026)
- React Native infinite loop fix in useEffect dependencies (v0.5.6)
- Speed parameter support in TTS overrides (v0.5.7)
- Localization support for chat UI terms (v0.12.3)

---

## Package Selection Guide

**Which ElevenLabs package should I use?**

| Package | Environment | Use Case |
|---------|-------------|----------|
| `@elevenlabs/elevenlabs-js` | **Server only** (Node.js) | Full API access, TTS, voices, models |
| `@elevenlabs/client` | **Browser + Server** | Agents SDK, WebSocket, lightweight |
| `@elevenlabs/react` | **React apps** | Conversational AI hooks |
| `@elevenlabs/react-native` | **Mobile** | iOS/Android agents |

**⚠️ Why elevenlabs-js doesn't work in browser:**
- Depends on Node.js `child_process` module (by design)
- **Error**: `Module not found: Can't resolve 'child_process'`
- **Workaround for browser API access**: Create proxy server endpoint using `elevenlabs-js`, call proxy from browser

**Affected Frameworks:**
- Next.js client components
- Vite browser builds
- Electron renderer process
- Tauri webview

**Source**: [GitHub Issue #293](https://github.com/elevenlabs/elevenlabs-js/issues/293)

---

## 1. Quick Start

### React SDK
```bash
npm install @elevenlabs/react zod
```

```typescript
import { useConversation } from '@elevenlabs/react';

const { startConversation, stopConversation, status } = useConversation({
  agentId: 'your-agent-id',
  signedUrl: '/api/elevenlabs/auth', // Recommended (secure)
  // OR apiKey: process.env.NEXT_PUBLIC_ELEVENLABS_API_KEY,

  clientTools: { /* browser-side tools */ },
  onEvent: (event) => { /* transcript, agent_response, tool_call */ },
  serverLocation: 'us' // 'eu-residency' | 'in-residency' | 'global'
});
```

### CLI ("Agents as Code")
```bash
npm install -g @elevenlabs/agents-cli
elevenlabs auth login
elevenlabs agents init                              # Creates agents.json, tools.json, tests.json
elevenlabs agents add "Bot" --template customer-service
elevenlabs agents push --env dev                    # Deploy
elevenlabs agents test "Bot"                        # Test
```

### API (Programmatic)
```typescript
import { ElevenLabsClient } from 'elevenlabs';
const client = new ElevenLabsClient({ apiKey: process.env.ELEVENLABS_API_KEY });

const agent = await client.agents.create({
  name: 'Support Bot',
  conversation_config: {
    agent: { prompt: { prompt: "...", llm: "gpt-4o" }, language: "en" },
    tts: { model_id: "eleven_turbo_v2_5", voice_id: "your-voice-id" }
  }
});
```

---

## 2. SDK Parameter Naming (camelCase vs snake_case)

**CRITICAL**: The JS SDK uses **camelCase** for parameters while the Python SDK and API use **snake_case**. Using snake_case in JS causes silent failures where parameters are ignored.

**Common Parameters:**

| API/Python (snake_case) | JS SDK (camelCase) |
|-------------------------|-------------------|
| `model_id` | `modelId` |
| `voice_id` | `voiceId` |
| `output_format` | `outputFormat` |
| `voice_settings` | `voiceSettings` |

**Example:**
```typescript
// ❌ WRONG - parameter ignored (snake_case):
const stream = await elevenlabs.textToSpeech.convert(voiceId, {
  model_id: "eleven_v3",  // Silently ignored!
  text: "Hello"
});

// ✅ CORRECT - use camelCase:
const stream = await elevenlabs.textToSpeech.convert(voiceId, {
  modelId: "eleven_v3",   // Works!
  text: "Hello"
});
```

**Tip**: Always check TypeScript types for correct parameter names. This is the most common error when migrating from Python SDK.

**Source**: [GitHub Issue #300](https://github.com/elevenlabs/elevenlabs-js/issues/300)

---

## 3. Agent Configuration

### System Prompt Architecture (6 Components)

**1. Personality** - Identity, role, character traits
**2. Environment** - Communication context (phone, web, video)
**3. Tone** - Formality, speech patterns, verbosity
**4. Goal** - Objectives and success criteria
**5. Guardrails** - Boundaries, prohibited topics, ethical constraints
**6. Tools** - Available capabilities and when to use them

**Template:**
```json
{
  "agent": {
    "prompt": {
      "prompt": "Personality:\n[Agent identity and role]\n\nEnvironment:\n[Communication context]\n\nTone:\n[Speech style]\n\nGoal:\n[Primary objectives]\n\nGuardrails:\n[Boundaries and constraints]\n\nTools:\n[Available tools and usage]",
      "llm": "gpt-4o", // gpt-5.1, claude-sonnet-4-5, gemini-3-pro-preview
      "temperature": 0.7
    }
  }
}
```

**2025 LLM Models:**
- `gpt-5.1`, `gpt-5.1-2025-11-13` (Oct 2025)
- `claude-sonnet-4-5`, `claude-sonnet-4-5@20250929` (Oct 2025)
- `gemini-3-pro-preview` (2025)
- `gemini-2.5-flash-preview-09-2025` (Oct 2025)

### Turn-Taking Modes

| Mode | Behavior | Best For |
|------|----------|----------|
| **Eager** | Responds quickly | Fast-paced support, quick orders |
| **Normal** | Balanced (default) | General customer service |
| **Patient** | Waits longer | Information collection, therapy |

```json
{ "conversation_config": { "turn": { "mode": "patient" } } }
```

### Workflows & Agent Management (2025)

**Workflow Features:**
- **Subagent Nodes** - Override prompt, voice, turn-taking per node
- **Tool Nodes** - Guarantee tool execution
- **Edges** - Conditional routing with `edge_order` (determinism, Oct 2025)

```json
{
  "workflow": {
    "nodes": [
      { "id": "node_1", "type": "subagent", "config": { "system_prompt": "...", "turn_eagerness": "patient" } },
      { "id": "node_2", "type": "tool", "tool_name": "transfer_to_human" }
    ],
    "edges": [{ "from": "node_1", "to": "node_2", "condition": "escalation", "edge_order": 1 }]
  }
}
```

**Agent Management (2025):**
- **Agent Archiving** - `archived: true` field (Oct 2025)
- **Agent Duplication** - Clone existing agents
- **Service Account API Keys** - Management endpoints (Jul 2025)

### Dynamic Variables

Use `{{var_name}}` syntax in prompts, messages, and tool parameters.

**System Variables:**
- `{{system__agent_id}}`, `{{system__conversation_id}}`
- `{{system__caller_id}}`, `{{system__called_number}}` (telephony)
- `{{system__call_duration_secs}}`, `{{system__time_utc}}`
- `{{system__call_sid}}` (Twilio only)

**Custom Variables:**
```typescript
await client.conversations.create({
  agent_id: "agent_123",
  dynamic_variables: { user_name: "John", account_tier: "premium" }
});
```

**Secret Variables:** `{{secret__api_key}}` (headers only, never sent to LLM)

**⚠️ Error:** Missing variables cause "Missing required dynamic variables" - always provide all referenced variables.

---

## 3. Voice & Language Features

### Multi-Voice, Pronunciation & Speed

**Multi-Voice** - Switch voices dynamically (adds ~200ms latency per switch):
```json
{ "prompt": "When speaking as customer, use voice_id 'voice_abc'. As agent, use 'voice_def'." }
```

**Pronunciation Dictionary** - IPA, CMU, word substitutions (Turbo v2/v2.5 only):
```json
{
  "pronunciation_dictionary": [
    { "word": "API", "pronunciation": "ey-pee-ay", "format": "cmu" },
    { "word": "AI", "substitution": "artificial intelligence" }
  ]
}
```

**PATCH Support (Aug 2025)** - Update dictionaries without replacement

**Speed Control** - 0.7x-1.2x (use 0.9x-1.1x for natural sound):
```json
{ "voice_settings": { "speed": 1.0 } }
```

**Voice Cloning Best Practices:**
- Clean audio (no noise, music, pops)
- Consistent microphone distance
- 1-2 minutes of audio
- Use language-matched voices (English voices fail on non-English)

### Language Configuration

**32+ Languages** with automatic detection and in-conversation switching.

**Multi-Language Presets:**
```json
{
  "language_presets": [
    { "language": "en", "voice_id": "en_voice", "first_message": "Hello!" },
    { "language": "es", "voice_id": "es_voice", "first_message": "¡Hola!" }
  ]
}
```

---

## 4. Knowledge Base & RAG

Enable agents to access large knowledge bases without loading entire documents into context.

**Workflow:**
1. Upload documents (PDF, TXT, DOCX)
2. Compute RAG index (vector embeddings)
3. Agent retrieves relevant chunks during conversation

**Configuration:**
```json
{
  "agent": { "prompt": { "knowledge_base": ["doc_id_1", "doc_id_2"] } },
  "knowledge_base_config": {
    "max_chunks": 5,
    "vector_distance_threshold": 0.8
  }
}
```

**API Upload:**
```typescript
const doc = await client.knowledgeBase.upload({ file: fs.createReadStream('docs.pdf'), name: 'Docs' });
await client.knowledgeBase.computeRagIndex({ document_id: doc.id, embedding_model: 'e5_mistral_7b' });
```

**⚠️ Gotchas:** RAG adds ~500ms latency. Check index status before use - indexing can take minutes.

---

## 5. Tools (4 Types)

### ⚠️ BREAKING CHANGE: prompt.tools Deprecated (July 2025)

The legacy `prompt.tools` array was **removed on July 23, 2025**. All agent configurations must use the new format.

**Migration Timeline:**
- July 14, 2025: Legacy format still accepted
- July 15, 2025: GET responses stop including `tools` field
- **July 23, 2025**: POST/PATCH reject `prompt.tools` (active now)

**Old Format** (no longer works):
```typescript
{
  agent: {
    prompt: {
      tools: [{ name: "get_weather", url: "...", method: "GET" }]
    }
  }
}
```

**New Format** (required):
```typescript
{
  agent: {
    prompt: {
      tool_ids: ["tool_abc123"],         // Client/server tools
      built_in_tools: ["end_call"]       // System tools (new field)
    }
  }
}
```

**Error if both used**: "A request must include either prompt.tool_ids or the legacy prompt.tools array — never both"

**Note**: All tools from legacy format were auto-migrated to standalone tool records.

**Source**: [Official Migration Guide](https://elevenlabs.io/docs/agents-platform/customization/tools/agent-tools-deprecation)

---

### A. Client Tools (Browser/Mobile)

Execute in browser or mobile app. **Tool names case-sensitive.**

```typescript
clientTools: {
  updateCart: {
    description: "Update shopping cart",
    parameters: z.object({ item: z.string(), quantity: z.number() }),
    handler: async ({ item, quantity }) => {
      // Client-side logic
      return { success: true };
    }
  }
}
```

### B. Server Tools (Webhooks)

HTTP requests to external APIs. **PUT support added Apr 2025.**

```json
{
  "name": "get_weather",
  "url": "https://api.weather.com/{{user_id}}",
  "method": "GET",
  "headers": { "Authorization": "Bearer {{secret__api_key}}" },
  "parameters": { "type": "object", "properties": { "city": { "type": "string" } } }
}
```

**⚠️ Secret variables** only in headers (not URL/body)

**2025 Features:**
- **transfer-to-human** system tool (Apr 2025)
- **tool_latency_secs** tracking (Apr 2025)

**⚠️ Historical Issue (Fixed Feb 2025):**
Tool calling was broken with `gpt-4o-mini` due to an OpenAI API change. This was fixed in SDK v2.25.0+ (Feb 17, 2025). If using older SDK versions, upgrade to avoid silent tool execution failures on that model.

**Source**: [Changelog Feb 17, 2025](https://elevenlabs.io/docs/changelog/2025/2/17)

### C. MCP Tools (Model Context Protocol)

Connect to MCP servers for databases, IDEs, data sources.

**Configuration:** Dashboard → Add Custom MCP Server → Configure SSE/HTTP endpoint

**Approval Modes:** Always Ask | Fine-Grained | No Approval

**2025 Updates:**
- **disable_interruptions** flag (Oct 2025) - Prevents interruption during tool execution
- **Tools Management Interface** (Jun 2025)

**⚠️ Limitations:** SSE/HTTP only. Not available for Zero Retention or HIPAA.

### D. System Tools

Built-in conversation control (no external APIs):
- `end_call`, `detect_language`, `transfer_agent`
- `transfer_to_number` (telephony)
- `dtmf_playpad`, `voicemail_detection` (telephony)

**2025:** `use_out_of_band_dtmf` flag for telephony integration

---

## 6. SDK Integration

### useConversation Hook (React/React Native)

```typescript
const { startConversation, stopConversation, status, isSpeaking } = useConversation({
  agentId: 'your-agent-id',
  signedUrl: '/api/auth', // OR apiKey: process.env.NEXT_PUBLIC_ELEVENLABS_API_KEY
  clientTools: { /* ... */ },
  onEvent: (event) => { /* transcript, agent_response, tool_call, agent_tool_request (Oct 2025) */ },
  onConnect/onDisconnect/onError,
  serverLocation: 'us' // 'eu-residency' | 'in-residency' | 'global'
});
```

**2025 Events:**
- `agent_chat_response_part` - Streaming responses (Oct 2025)
- `agent_tool_request` - Tool interaction tracking (Oct 2025)

### Connection Types: WebRTC vs WebSocket

| Feature | WebSocket | WebRTC (Jul 2025 rollout) |
|---------|-----------|---------------------------|
| **Auth** | `signedUrl` | `conversationToken` |
| **Audio** | Configurable (16k/24k/48k) | PCM_48000 (hardcoded) |
| **Latency** | Standard | Lower |
| **Best For** | Flexibility | Low-latency |

**⚠️ WebRTC:** Hardcoded PCM_48000, limited device switching

### Platforms

- **React**: `@elevenlabs/[email protected]`
- **JavaScript**: `@elevenlabs/[email protected]` - `new Conversation({...})`
- **React Native**: `@elevenlabs/[email protected]` - Expo SDK 47+, iOS/macOS (custom build required, no Expo Go)
- **Swift**: iOS 14.0+, macOS 11.0+, Swift 5.9+
- **Embeddable Widget**: `<script src="https://elevenlabs.io/convai-widget/index.js"></script>`
- **Widget Packages** (Dec 2025):
  - `@elevenlabs/[email protected]` - For embedding in existing apps
  - `@elevenlabs/[email protected]` - Core widget functionality

### Scribe (Real-Time Speech-to-Text - Beta 2025)

Real-time transcription with word-level timestamps. **Single-use tokens**, not API keys.

```typescript
const { connect, startRecording, stopRecording, transcript, partialTranscript } = useScribe({
  token: async () => (await fetch('/api/scribe/token')).json().then(d => d.token),
  commitStrategy: 'vad', // 'vad' (auto on silence) | 'manual' (explicit .commit())
  sampleRate: 16000, // 16000 or 24000
  onPartialTranscript/onFinalTranscript/onError
});
```

**Events:** PARTIAL_TRANSCRIPT, FINAL_TRANSCRIPT_WITH_TIMESTAMPS, SESSION_STARTED, ERROR

**⚠️ Closed Beta** - requires sales contact. For agents, use Agents Platform instead (LLM + TTS + two-way interaction).

**⚠️ Webhook Mode Issue:**
Using `speechToText.convert()` with `webhook: true` causes SDK parsing errors. The API returns only `{ request_id }` for webhook mode, but the SDK expects the full transcription schema.

**Error Message:**
```
ParseError: response: Missing required key "language_code"; Missing required key "text"; ...
```

**Workaround** - Use direct fetch API instead of SDK:
```typescript
const formData = new FormData();
formData.append('file', audioFile);
formData.append('model_id', 'scribe_v1');
formData.append('webhook', 'true');
formData.append('webhook_id', webhookId);

const response = await fetch('https://api.elevenlabs.io/v1/speech-to-text', {
  method: 'POST',
  headers: { 'xi-api-key': apiKey },
  body: formData,
});

const result = await response.json(); // { request_id: 'xxx' }
// Actual transcription delivered to webhook endpoint
```

**Source**: [GitHub Issue #232](https://github.com/elevenlabs/elevenlabs-js/issues/232) (confirmed by maintainer)

---

## 7. Testing & Evaluation

### 🆕 Agent Testing Framework (Aug 2025)

Comprehensive automated testing with **9 new API endpoints** for creating, managing, and executing tests.

**Test Types:**
- **Scenario Testing** - LLM-based evaluation against success criteria
- **Tool Call Testing** - Verify correct tool usage and parameters
- **Load Testing** - High-concurrency capacity testing

**CLI Workflow:**
```bash
# Create test
elevenlabs tests add "Refund Test" --template basic-llm

# Configure in test_configs/refund-test.json
{
  "name": "Refund Test",
  "scenario": "Customer requests refund",
  "success_criteria": ["Agent acknowledges empathetically", "Verifies order details"],
  "expected_tool_call": { "tool_name": "lookup_order", "parameters": { "order_id": "..." } }
}

# Deploy and execute
elevenlabs tests push
elevenlabs agents test "Support Agent"
```

**9 New API Endpoints (Aug 2025):**
1. `POST /v1/convai/tests` - Create test
2. `GET /v1/convai/tests/:id` - Retrieve test
3. `PATCH /v1/convai/tests/:id` - Update test
4. `DELETE /v1/convai/tests/:id` - Delete test
5. `POST /v1/convai/tests/:id/execute` - Execute test
6. `GET /v1/convai/test-invocations` - List invocations (pagination, agent filtering)
7. `POST /v1/convai/test-invocations/:id/resubmit` - Resubmit failed test
8. `GET /v1/convai/test-results/:id` - Get results
9. `GET /v1/convai/test-results/:id/debug` - Detailed debugging info

**Test Invocation Listing (Oct 2025):**
```typescript
const invocations = await client.convai.testInvocations.list({
  agent_id: 'agent_123',      // Filter by agent
  page_size: 30,              // Default 30, max 100
  cursor: 'next_page_cursor'  // Pagination
});
// Returns: test run counts, pass/fail stats, titles
```

**Programmatic Testing:**
```typescript
const simulation = await client.agents.simulate({
  agent_id: 'agent_123',
  scenario: 'Refund request',
  user_messages: ["I want a refund", "Order #12345"],
  success_criteria: ["Acknowledges request", "Verifies order"]
});
console.log('Passed:', simulation.passed);
```

**Agent Tracking (Oct 2025):** Tests now include `agent_id` association for better organization

---

## 8. Analytics & Monitoring

**2025 Features:**
- **Custom Dashboard Charts** (Apr 2025) - Display evaluation criteria metrics over time
- **Call History Filtering** (Apr 2025) - `call_start_before_unix` parameter
- **Multi-Voice History** - Separate conversation history by voice
- **LLM Cost Tracking** - Per agent/conversation costs with `aggregation_interval` (hour/day/week/month)
- **Tool Latency** (Apr 2025) - `tool_latency_secs` tracking
- **Usage Metrics** - minutes_used, request_count, ttfb_avg, ttfb_p95

**Conversation Analysis:** Success evaluation (LLM-based), data collection fields, post-call webhooks

**Access:** Dashboard → Analytics | Post-call Webhooks | API

---

## 9. Privacy & Compliance

**Data Retention:** 2 years default (GDPR). Configure: `{ "transcripts": { "retention_days": 730 }, "audio": { "retention_days": 2190 } }`

**Encryption:** TLS 1.3 (transit), AES-256 (rest)

**Regional:** `serverLocation: 'eu-residency' | 'us' | 'global' | 'in-residency'`

**Zero Retention Mode:** Immediate deletion (no history, analytics, webhooks, or MCP)

**Compliance:** GDPR (1-2 years), HIPAA (6 years), SOC 2 (automatic encryption)

---

## 10. Cost Optimization

**LLM Caching:** Up to 90% savings on repeated inputs. `{ "caching": { "enabled": true, "ttl_seconds": 3600 } }`

**Model Swapping:** GPT-5.1, GPT-4o/mini, Claude Sonnet 4.5, Gemini 3 Pro/2.5 Flash (2025 models)

**Burst Pricing:** 3x concurrency limit at 2x cost. `{ "burst_pricing_enabled": true }`

---

## 11. Advanced Features

**2025 Platform Updates:**
- **Azure OpenAI** (Jul 2025) - Custom LLM with Azure-hosted models (requires API version field)
- **Genesys Output Variables** (Jul 2025) - Enhanced call analytics
- **LLMReasoningEffort "none"** (Oct 2025) - Control model reasoning behavior
- **Streaming Voice Previews** (Jul 2025) - Real-time voice generation
- **pcm_48000** audio format (Apr 2025) - New output format support

**Events:** `audio`, `transcript`, `agent_response`, `tool_call`, `agent_chat_response_part` (streaming, Oct 2025), `agent_tool_request` (Oct 2025), `conversation_state`

**Custom Models:** Bring your own LLM (OpenAI-compatible endpoints). `{ "llm_config": { "custom": { "endpoint": "...", "api_key": "{{secret__key}}" } } }`

**Post-Call Webhooks:** HMAC verification required. Return 200 or auto-disable after 10 failures. Payload includes conversation_id, transcript, analysis.

**Chat Mode:** Text-only (no ASR/TTS). `{ "chat_mode": true }`. Saves ~200ms + costs.

**Telephony:** SIP (sip-static.rtc.elevenlabs.io), Twilio native, Vonage, RingCentral. **2025:** Twilio keypad fix (Jul), SIP TLS remote_domains validation (Oct)

---

## 12. CLI & DevOps ("Agents as Code")

**Installation & Auth:**
```bash
npm install -g @elevenlabs/[email protected]
elevenlabs auth login
elevenlabs auth residency eu-residency  # 'in-residency' | 'global'
export ELEVENLABS_API_KEY=your-api-key  # For CI/CD
```

**Project Structure:** `agents.json`, `tools.json`, `tests.json` + `agent_configs/`, `tool_configs/`, `test_configs/`

**Key Commands:**
```bash
elevenlabs agents init
elevenlabs agents add "Bot" --template customer-service
elevenlabs agents push --env prod --dry-run  # Preview
elevenlabs agents push --env prod            # Deploy
elevenlabs agents pull                       # Import existing
elevenlabs agents test "Bot"                 # 2025: Enhanced testing

elevenlabs tools add-webhook "Weather" --config-path tool_configs/weather.json
elevenlabs tools push

elevenlabs tests add "Test" --template basic-llm
elevenlabs tests push
```

**Multi-Environment:** Create `agent.dev.json`, `agent.staging.json`, `agent.prod.json` for overrides

**CI/CD:** GitHub Actions with `--dry-run` validation before deploy

**.gitignore:** `.env`, `.elevenlabs/`, `*.secret.json`

---

## 13. Common Errors & Solutions (27 Documented)

### Error 1: Missing Required Dynamic Variables
**Cause:** Variables referenced in prompts not provided at conversation start
**Solution:** Provide all variables in `dynamic_variables: { user_name: "John", ... }`

### Error 2: Case-Sensitive Tool Names
**Cause:** Tool name mismatch (case-sensitive)
**Solution:** Ensure `tool_ids: ["orderLookup"]` matches `name: "orderLookup"` exactly

### Error 3: Webhook Authentication Failures
**Cause:** Incorrect HMAC signature, not returning 200, or 10+ failures
**Solution:** Verify `hmac = crypto.createHmac('sha256', SECRET).update(payload).digest('hex')` and return 200
**⚠️ Header Name:** Use `ElevenLabs-Signature` (NOT `X-ElevenLabs-Signature` - no X- prefix!)

### Error 4: Voice Consistency Issues
**Cause:** Background noise, inconsistent mic distance, extreme volumes in training
**Solution:** Use clean audio, consistent distance, avoid extremes

### Error 5: Wrong Language Voice
**Cause:** English-trained voice for non-English language
**Solution:** Use language-matched voices: `{ "language": "es", "voice_id": "spanish_voice" }`

### Error 6: Restricted API Keys Not Supported (CLI)
**Cause:** CLI doesn't support restricted API keys
**Solution:** Use unrestricted API key for CLI

### Error 7: Agent Configuration Push Conflicts
**Cause:** Hash-based change detection missed modification
**Solution:** `elevenlabs agents init --override` + `elevenlabs agents pull` + push

### Error 8: Tool Parameter Schema Mismatch
**Cause:** Schema doesn't match usage
**Solution:** Add clear descriptions: `"description": "Order ID (format: ORD-12345)"`

### Error 9: RAG Index Not Ready
**Cause:** Index still computing (takes minutes)
**Solution:** Check `index.status === 'ready'` before using

### Error 10: WebSocket Protocol Error (1002)
**Cause:** Network instability, incompatible browser, or firewall issues
**Symptoms:**
```
Error receiving message: received 1002 (protocol error)
Error sending user audio chunk: received 1002 (protocol error)
WebSocket is already in CLOSING or CLOSED state
```
Connection cycles: Disconnected → Connected → Disconnected rapidly

**Solution:**
1. **Use WebRTC instead of WebSocket** for better stability: `connectionType: 'webrtc'`
2. **Implement reconnection logic** with exponential backoff
3. **Check network stability** and firewall rules (port restrictions)
4. **Test on different networks/browsers** to isolate the issue

**Source**: [GitHub Issue #134](https://github.com/elevenlabs/elevenlabs-examples/issues/134)

### Error 11: 401 Unauthorized in Production
**Cause:** Agent visibility or API key config
**Solution:** Check visibility (public/private), verify API key in prod, check allowlist

### Error 12: Allowlist Connection Errors
**Cause:** Allowlist enabled but using shared link, OR localhost validation bug
**Symptoms:**
```
Host is not supported
Host is not valid or supported
Host is not in insights whitelist
WebSocket is already in CLOSING or CLOSED state
```

**Solution:**
1. Configure allowlist domains in dashboard or disable for testing
2. **Localhost workaround**: Use `127.0.0.1:3000` instead of `localhost:3000`

**⚠️ Localhost Validation Bug:**
The dashboard has inconsistent validation for localhost URLs:
- ❌ `localhost:3000` → Rejected (should be valid)
- ❌ `http://localhost:3000` → Rejected (protocol not allowed)
- ❌ `localhost:3000/voice-chat` → Rejected (paths not allowed)
- ✅ `www.localhost:3000` → Accepted (invalid but accepted!)
- ✅ `127.0.0.1:3000` → Accepted (use this for local dev)

**Source**: [GitHub Issue #320](https://github.com/elevenlabs/elevenlabs-js/issues/320)

### Error 13: Workflow Infinite Loops
**Cause:** Edge conditions creating loops
**Solution:** Add max iteration limits, test all paths, explicit exit conditions

### Error 14: Burst Pricing Not Enabled
**Cause:** Burst not enabled in settings
**Solution:** `{ "call_limits": { "burst_pricing_enabled": true } }`

### Error 15: MCP Server Timeout
**Cause:** MCP server slow/unreachable
**Solution:** Check URL accessible, verify transport (SSE/HTTP), check auth, monitor logs

### Error 16: First Message Cutoff on Android
**Cause:** Android needs time to switch audio mode
**Solution:** `connectionDelay: { android: 3_000, ios: 0 }` (3s for audio routing)

### Error 17: CSP (Content Security Policy) Violations
**Cause:** Strict CSP blocks `blob:` URLs. SDK uses Audio Worklets loaded as blobs
**Solution:** Self-host worklets:
1. `cp node_modules/@elevenlabs/client/dist/worklets/*.js public/elevenlabs/`
2. Configure: `workletPaths: { 'rawAudioProcessor': '/elevenlabs/rawAudioProcessor.worklet.js', 'audioConcatProcessor': '/elevenlabs/audioConcatProcessor.worklet.js' }`
3. Update CSP: `script-src 'self' https://elevenlabs.io; worker-src 'self';`
**Gotcha:** Update worklets when upgrading `@elevenlabs/client`

### Error 18: Webhook Payload - Null Message on Tool Calls
**Cause:** Schema expects `message: string` but ElevenLabs sends `null` when agent makes tool calls
**Solution:** Use `z.string().nullable()` for message field in Zod schemas
```typescript
// ❌ Fails on tool call turns:
message: z.string()

// ✅ Correct:
message: z.string().nullable()
```
**Real payload example:**
```json
{ "role": "agent", "message": null, "tool_calls": [{ "tool_name": "my_tool", ... }] }
```

### Error 19: Webhook Payload - call_successful is String, Not Boolean
**Cause:** Schema expects `call_successful: boolean` but ElevenLabs sends `"success"` or `"failure"` strings
**Solution:** Accept both types and convert for database storage
```typescript
// Schema:
call_successful: z.union([z.boolean(), z.string()]).optional()

// Conversion helper:
function parseCallSuccessful(value: unknown): boolean | undefined {
  if (value === undefined || value === null) return undefined
  if (typeof value === 'boolean') return value
  if (typeof value === 'string') return value.toLowerCase() === 'success'
  return undefined
}
```

### Error 20: Webhook Schema Validation Fails Silently
**Cause:** Real ElevenLabs payloads have many undocumented fields that strict schemas reject
**Undocumented fields in transcript turns:**
- `agent_metadata`, `multivoice_message`, `llm_override`, `rag_retrieval_info`
- `llm_usage`, `interrupted`, `original_message`, `source_medium`
**Solution:** Add all as `.optional()` with `z.any()` for fields you don't process
**Debugging tip:** Use https://webhook.site to capture real payloads, then test schema locally

### Error 21: Webhook Cost Field is Credits, NOT USD
**Cause:** `metadata.cost` contains **ElevenLabs credits**, not USD dollars. Displaying this directly shows wildly wrong values (e.g., "$78.0000" when actual cost is ~$0.003)
**Solution:** Extract actual USD from `metadata.charging.llm_price` instead
```typescript
// ❌ Wrong - displays credits as dollars:
cost: metadata?.cost  // Returns 78 (credits)

// ✅ Correct - actual USD cost:
const charging = metadata?.charging as any
cost: charging?.llm_price ?? null  // Returns 0.0036 (USD)
```
**Real payload structure:**
```json
{
  "metadata": {
    "cost": 78,  // ← CREDITS, not dollars!
    "charging": {
      "llm_price": 0.0036188999999999995,  // ← Actual USD cost
      "llm_charge": 18,   // LLM credits
      "call_charge": 60,  // Audio credits
      "tier": "pro"
    }
  }
}
```
**Note:** `llm_price` only covers LLM costs. Audio costs may require separate calculation based on your plan.

### Error 22: User Context Available But Not Extracted
**Cause:** Webhook contains authenticated user info from widget but code doesn't extract it
**Solution:** Extract `dynamic_variables` from `conversation_initiation_client_data`
```typescript
const dynamicVars = data.conversation_initiation_client_data?.dynamic_variables
const callerName = dynamicVars?.user_name || null
const callerEmail = dynamicVars?.user_email || null
const currentPage = dynamicVars?.current_page || null
```
**Payload example:**
```json
{
  "conversation_initiation_client_data": {
    "dynamic_variables": {
      "user_name": "Jeremy Dawes",
      "user_email": "[email protected]",
      "current_page": "/dashboard/calls"
    }
  }
}
```

### Error 23: Data Collection Results Available But Not Displayed
**Cause:** ElevenLabs agents can collect structured data during calls (configured in agent settings). This data is stored in `analysis.data_collection_results` but often not parsed/displayed in UI.
**Solution:** Parse the JSON and display collected fields with their values and rationales
```typescript
const dataCollectionResults = analysis?.dataCollectionResults
  ? JSON.parse(analysis.dataCollectionResults)
  : null

// Display each collected field:
Object.entries(dataCollectionResults).forEach(([key, data]) => {
  console.log(`${key}: ${data.value} (${data.rationale})`)
})
```
**Payload example:**
```json
{
  "data_collection_results": {
    "customer_name": { "value": "John Smith", "rationale": "Customer stated their name" },
    "intent": { "value": "billing_inquiry", "rationale": "Asking about invoice" },
    "callback_number": { "value": "+61400123456", "rationale": "Provided for callback" }
  }
}
```

### Error 24: Evaluation Criteria Results Available But Not Displayed
**Cause:** Custom success criteria (configured in agent) produce results in `analysis.evaluation_criteria_results` but often not parsed/displayed
**Solution:** Parse and show pass/fail status with rationales
```typescript
const evaluationResults = analysis?.evaluationCriteriaResults
  ? JSON.parse(analysis.evaluationCriteriaResults)
  : null

Object.entries(evaluationResults).forEach(([key, data]) => {
  const passed = data.result === 'success' || data.result === true
  console.log(`${key}: ${passed ? 'PASS' : 'FAIL'} - ${data.rationale}`)
})
```
**Payload example:**
```json
{
  "evaluation_criteria_results": {
    "verified_identity": { "result": "success", "rationale": "Customer verified DOB" },
    "resolved_issue": { "result": "failure", "rationale": "Escalated to human" }
  }
}
```

### Error 25: Feedback Rating Available But Not Extracted
**Cause:** User can provide thumbs up/down feedback. Stored in `metadata.feedback.thumb_rating` but not extracted
**Solution:** Extract and store the rating (1 = thumbs up, -1 = thumbs down)
```typescript
const feedback = metadata?.feedback as any
const feedbackRating = feedback?.thumb_rating ?? null  // 1, -1, or null

// Also available:
const likes = feedback?.likes    // Array of things user liked
const dislikes = feedback?.dislikes  // Array of things user disliked
```
**Payload example:**
```json
{
  "metadata": {
    "feedback": {
      "thumb_rating": 1,
      "likes": ["helpful", "natural"],
      "dislikes": []
    }
  }
}
```

### Error 26: Per-Turn Metadata Not Extracted (interrupted, source_medium, rag_retrieval_info)
**Cause:** Each transcript turn has valuable metadata that's often ignored
**Solution:** Store these fields per message for analytics and debugging
```typescript
const turnAny = turn as any
const messageData = {
  // ... existing fields
  interrupted: turnAny.interrupted ?? null,          // Was turn cut off by user?
  sourceMedium: turnAny.source_medium ?? null,       // Channel: web, phone, etc.
  originalMessage: turnAny.original_message ?? null, // Pre-processed message
  ragRetrievalInfo: turnAny.rag_retrieval_info       // What knowledge was retrieved
    ? JSON.stringify(turnAny.rag_retrieval_info)
    : null,
}
```
**Use cases:**
- `interrupted: true` → User spoke over agent (UX insight)
- `source_medium` → Analytics by channel
- `rag_retrieval_info` → Debug/improve knowledge base retrieval

### Error 27: Upcoming Audio Flags (August 2025)
**Cause:** Three new boolean fields coming in August 2025 webhooks that may break schemas
**Solution:** Add these fields to schemas now (as optional) to be ready
```typescript
// In webhook payload (coming August 15, 2025):
has_audio: boolean        // Was full audio recorded?
has_user_audio: boolean   // Was user audio captured?
has_response_audio: boolean // Was agent audio captured?

// Schema (future-proof):
const schema = z.object({
  // ... existing fields
  has_audio: z.boolean().optional(),
  has_user_audio: z.boolean().optional(),
  has_response_audio: z.boolean().optional(),
})
```
**Note:** These match the existing fields in the GET Conversation API response

### Error 28: Tool Parsing Fails When Tool Not Found
**Cause:** Calling `conversations.get(id)` when conversation contains tool_results where the tool was deleted/not found
**Error Message:**
```
Error: response -> transcript -> [11] -> tool_results -> [0] -> type:
Expected string. Received null.;
response -> transcript -> [11] -> tool_results -> [0] -> type:
[Variant 1] Expected "system". Received null.;
response -> transcript -> [11] -> tool_results -> [0] -> type:
[Variant 2] Expected "workflow". Received null.
```

**Solution:**
1. **SDK fix needed** - SDK should handle null tool_results.type gracefully
2. **Workaround for users:**
   - Ensure all referenced tools exist before deleting them
   - Wrap `conversation.get()` in try-catch until SDK is fixed
   ```typescript
   try {
     const conversation = await client.conversationalAi.conversations.get(id);
   } catch (error) {
     console.error('Tool parsing error - conversation may reference deleted tools');
   }
   ```

**Source**: [GitHub Issue #268](https://github.com/elevenlabs/elevenlabs-js/issues/268)

### Error 29: SDK Parameter Naming Confusion (snake_case vs camelCase)
**Cause:** Using snake_case parameters (from API/Python SDK docs) in JS SDK, which expects camelCase
**Symptoms:** Parameters silently ignored, wrong model/voice used, no error messages

**Common Mistakes:**
```typescript
// ❌ WRONG - parameter ignored:
convert(voiceId, { model_id: "eleven_v3" })

// ✅ CORRECT:
convert(voiceId, { modelId: "eleven_v3" })
```

**Solution:** Always use camelCase for JS SDK parameters. Check TypeScript types if unsure.

**Affected Parameters:** `model_id`, `voice_id`, `output_format`, `voice_settings`, and all API parameters

**Source**: [GitHub Issue #300](https://github.com/elevenlabs/elevenlabs-js/issues/300)

### Error 30: Webhook Mode ParseError with speechToText.convert()
**Cause:** SDK expects full transcription response but webhook mode returns only `{ request_id }`
**Error Message:**
```
ParseError: Missing required key "language_code"; Missing required key "text"; ...
```

**Solution:** Use direct fetch API instead of SDK for webhook mode:
```typescript
const formData = new FormData();
formData.append('file', audioFile);
formData.append('model_id', 'scribe_v1');
formData.append('webhook', 'true');
formData.append('webhook_id', webhookId);

const response = await fetch('https://api.elevenlabs.io/v1/speech-to-text', {
  method: 'POST',
  headers: { 'xi-api-key': apiKey },
  body: formData,
});

const result = await response.json(); // { request_id: 'xxx' }
```

**Source**: [GitHub Issue #232](https://github.com/elevenlabs/elevenlabs-js/issues/232)

### Error 31: Package Not Compatible with Browser/Web
**Cause:** Using `@elevenlabs/elevenlabs-js` in browser/client environments (depends on Node.js `child_process`)
**Error Message:**
```
Module not found: Can't resolve 'child_process'
```

**Affected Frameworks:**
- Next.js client components
- Vite browser builds
- Electron renderer process
- Tauri webview

**Solution:**
1. **For browser/web**: Use `@elevenlabs/client` or `@elevenlabs/react` instead
2. **For full API access in browser**: Create proxy server endpoint using `elevenlabs-js`, call from browser
3. **For Electron/Tauri**: Use `elevenlabs-js` in main process only, not renderer

**Note:** This is by design - `elevenlabs-js` is server-only

**Source**: [GitHub Issue #293](https://github.com/elevenlabs/elevenlabs-js/issues/293)

### Error 32: prompt.tools Deprecated - POST/PATCH Rejected
**Cause:** Using legacy `prompt.tools` array field after July 23, 2025 cutoff
**Error Message:**
```
A request must include either prompt.tool_ids or the legacy prompt.tools array — never both
```

**Solution:** Migrate to new format:
```typescript
// ❌ Old (rejected):
{ agent: { prompt: { tools: [...] } } }

// ✅ New (required):
{
  agent: {
    prompt: {
      tool_ids: ["tool_abc123"],         // Client/server tools
      built_in_tools: ["end_call"]       // System tools
    }
  }
}
```

**Note:** All legacy tools were auto-migrated to standalone records. Just update your configuration references.

**Source**: [Official Migration Guide](https://elevenlabs.io/docs/agents-platform/customization/tools/agent-tools-deprecation)

### Error 33: GPT-4o Mini Tool Calling Broken (Fixed Feb 2025)
**Cause:** OpenAI API breaking change affected `gpt-4o-mini` tool execution (historical issue)
**Symptoms:** Tools silently fail to execute, no error messages
**Solution:** Upgrade to SDK v2.25.0+ (released Feb 17, 2025). If using older SDK versions, upgrade or avoid `gpt-4o-mini` for tool-based workflows.

**Source**: [Changelog Feb 17, 2025](https://elevenlabs.io/docs/changelog/2025/2/17)

### Error 34: Scribe Audio Format Parameter Not Transmitted (Fixed v2.32.0)
**Cause:** WebSocket URI wasn't including `audio_format` parameter even when specified (historical issue)
**Solution:** Upgrade to `@elevenlabs/[email protected]` or later (released Jan 19, 2026)

**Source**: [GitHub PR #319](https://github.com/elevenlabs/elevenlabs-js/pull/319)

---

## 14. Agent Versioning (Jan 2026)

ElevenLabs introduced Agent Versioning in January 2026, enabling git-like version control for conversational AI agents. This allows safe experimentation, A/B testing, and gradual rollouts.

### Core Concepts

| Concept | ID Format | Description |
|---------|-----------|-------------|
| **Version** | `agtvrsn_xxxx` | Immutable snapshot of agent config at a point in time |
| **Branch** | `agtbrch_xxxx` | Isolated development path (like git branches) |
| **Draft** | Per-user/branch | Work-in-progress changes before committing |
| **Deployment** | Traffic splits | A/B testing with percentage-based routing |

### Enabling Versioning

```typescript
// Enable versioning on existing agent
const agent = await client.conversationalAi.agents.update({
  agentId: 'your-agent-id',
  enableVersioningIfNotEnabled: true
});
```

**⚠️ Note:** Once enabled, versioning cannot be disabled on an agent.

### Branch Management

```typescript
// Create a new branch for experimentation
const branch = await client.conversationalAi.agents.branches.create({
  agentId: 'your-agent-id',
  parentVersionId: 'agtvrsn_xxxx',  // Branch from this version
  name: 'experiment-v2'
});

// List all branches
const branches = await client.conversationalAi.agents.branches.list({
  agentId: 'your-agent-id'
});

// Delete a branch (must not have active traffic)
await client.conversationalAi.agents.branches.delete({
  agentId: 'your-agent-id',
  branchId: 'agtbrch_xxxx'
});
```

### Traffic Deployment (A/B Testing)

Route traffic between branches using percentage splits:

```typescript
// Deploy 90/10 traffic split
const deployment = await client.conversationalAi.agents.deployments.create({
  agentId: 'your-agent-id',
  deployments: [
    { branchId: 'agtbrch_main', percentage: 90 },
    { branchId: 'agtbrch_xxxx', percentage: 10 }
  ]
});

// Get current deployment status
const status = await client.conversationalAi.agents.deployments.get({
  agentId: 'your-agent-id'
});
```

**Use Cases:**
- **A/B Testing** - Test new prompts on 10% of traffic before full rollout
- **Gradual Rollouts** - Increase traffic incrementally (10% → 25% → 50% → 100%)
- **Quick Rollback** - Route 100% back to stable branch if issues detected

### Merging Branches

```typescript
// Merge successful experiment back to main
const merge = await client.conversationalAi.agents.branches.merge({
  agentId: 'your-agent-id',
  sourceBranchId: 'agtbrch_xxxx',
  targetBranchId: 'agtbrch_main',
  archiveSourceBranch: true  // Clean up after merge
});
```

### Working with Drafts

Drafts are per-user, per-branch work-in-progress states:

```typescript
// Get current draft
const draft = await client.conversationalAi.agents.drafts.get({
  agentId: 'your-agent-id',
  branchId: 'agtbrch_xxxx'
});

// Update draft (changes not yet committed)
await client.conversationalAi.agents.drafts.update({
  agentId: 'your-agent-id',
  branchId: 'agtbrch_xxxx',
  conversationConfig: {
    agent: { prompt: { prompt: 'Updated system prompt...' } }
  }
});

// Commit draft to create new version
const version = await client.conversationalAi.agents.drafts.commit({
  agentId: 'your-agent-id',
  branchId: 'agtbrch_xxxx',
  message: 'Improved greeting flow'
});
```

### Best Practices

1. **Always test on branch first** - Never experiment directly on production traffic
2. **Use descriptive branch names** - `feature-multilang`, `fix-timeout-handling`
3. **Start with small traffic splits** - Begin at 5-10%, monitor metrics, then increase
4. **Archive merged branches** - Keep repository clean
5. **Commit messages** - Use clear messages for version history

**Source**: [Agent Versioning Docs](https://elevenlabs.io/docs/agents-platform/customization/personalization/agent-versioning)

---

## 15. MCP Security & Guardrails

When connecting MCP (Model Context Protocol) servers to ElevenLabs agents, security is critical. MCP tools can access databases, APIs, and sensitive data.

### Tool Approval Modes

| Mode | Behavior | Use When |
|------|----------|----------|
| **Always Ask** | Explicit approval for every tool execution | Default - recommended for most cases |
| **Fine-Grained** | Auto-approve trusted ops, require approval for sensitive | Established, trusted MCP servers |
| **No Approval** | All tool executions auto-approved | Only thoroughly vetted, internal servers |

**Configuration:**
```typescript
{
  "mcp_config": {
    "server_url": "https://your-mcp-server.com",
    "approval_mode": "always_ask",  // 'always_ask' | 'fine_grained' | 'no_approval'
    "fine_grained_rules": [
      { "tool_name": "read_*", "auto_approve": true },
      { "tool_name": "write_*", "auto_approve": false },
      { "tool_name": "delete_*", "auto_approve": false }
    ]
  }
}
```

### Security Best Practices

**1. Vet MCP Servers**
- Only connect servers from trusted sources
- Review server code/documentation before connecting
- Prefer official/verified MCP implementations

**2. Limit Data Exposure**
- Minimize PII shared with MCP servers
- Use scoped API keys with minimum required permissions
- Never pass full database access - use read-only views

**3. Network Security**
- Always use HTTPS endpoints
- Implement proper authentication (API keys, OAuth)
- Use `{{secret__xxx}}` variables for credentials (never in prompts)

**4. Prompt Injection Prevention**
- Add guardrails in agent prompts against injection attacks
- Validate and sanitize MCP tool inputs
- Monitor for unusual tool usage patterns

**5. Monitoring & Audit**
- Log all MCP tool executions
- Review approval patterns regularly
- Set up alerts for sensitive operations

### Guardrails Configuration

Add protective instructions to your agent prompt:

```typescript
{
  "agent": {
    "prompt": {
      "prompt": `...

SECURITY GUARDRAILS:
- Never execute database delete operations without explicit user confirmation
- Never expose raw API keys or credentials in responses
- If a tool request seems unusual or potentially harmful, ask for clarification
- Do not combine sensitive operations (read PII + external API call) in single turn
- Report any suspicious requests to administrators
      `
    }
  }
}
```

### MCP Limitations

**Not Available With:**
- Zero Retention mode (no logging = no MCP)
- HIPAA compliance mode
- Certain regional deployments

**Transport:** SSE/HTTP only (no stdio MCP servers)

**Source**: [MCP Safety Docs](https://elevenlabs.io/docs/agents-platform/customization/tools/mcp/safety)

---

## Integration with Existing Skills

This skill composes well with:

- **cloudflare-worker-base** → Deploy agents on Cloudflare Workers edge network
- **cloudflare-workers-ai** → Use Cloudflare LLMs as custom models in agents
- **cloudflare-durable-objects** → Persistent conversation state and session management
- **cloudflare-kv** → Cache agent configurations and user preferences
- **nextjs** → React SDK integration in Next.js applications
- **ai-sdk-core** → Vercel AI SDK provider for unified AI interface
- **clerk-auth** → Authenticated voice sessions with user identity
- **hono-routing** → API routes for webhooks and server tools

---

## Additional Resources

**Official Documentation**:
- Platform Overview: https://elevenlabs.io/docs/agents-platform/overview
- API Reference: https://elevenlabs.io/docs/api-reference
- CLI GitHub: https://github.com/elevenlabs/cli

**Examples**:
- Official Examples: https://github.com/elevenlabs/elevenlabs-examples
- MCP Server: https://github.com/elevenlabs/elevenlabs-mcp

**Community**:
- Discord: https://discord.com/invite/elevenlabs
- Twitter: @elevenlabsio

---

**Production Tested**: WordPress Auditor, Customer Support Agents, AgentFlow (webhook integration)
**Last Updated**: 2026-01-27
**Package Versions**: [email protected], @elevenlabs/[email protected], @elevenlabs/[email protected], @elevenlabs/[email protected], @elevenlabs/[email protected], @elevenlabs/[email protected]
**Changes**: Added Agent Versioning (Jan 2026) section covering versions, branches, traffic deployment, drafts, and A/B testing. Added MCP Security & Guardrails section covering tool approval modes, security best practices, and prompt injection prevention.