preflight: scaffold + context files
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interview-agent/.agents/skills/livekit-agents/SKILL.md
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interview-agent/.agents/skills/livekit-agents/SKILL.md
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---
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name: livekit-agents
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description: 'Build voice AI agents with LiveKit Cloud and the Agents SDK. Use when the user asks to "build a voice agent", "create a LiveKit agent", "add voice AI", "implement handoffs", "structure agent workflows", or is working with LiveKit Agents SDK. Provides opinionated guidance for the recommended path: LiveKit Cloud + LiveKit Inference. REQUIRES writing tests for all implementations.'
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license: MIT
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metadata:
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author: livekit
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version: "0.3.1"
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---
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# LiveKit Agents Development for LiveKit Cloud
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This skill provides opinionated guidance for building voice AI agents with LiveKit Cloud. It assumes you are using LiveKit Cloud (the recommended path) and encodes *how to approach* agent development, not API specifics. All factual information about APIs, methods, and configurations must come from live documentation.
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**This skill is for LiveKit Cloud developers.** If you're self-hosting LiveKit, some recommendations (particularly around LiveKit Inference) won't apply directly.
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## MANDATORY: Read This Checklist Before Starting
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Before writing ANY code, complete this checklist:
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1. **Read this entire skill document** - Do not skip sections even if MCP is available
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2. **Ensure LiveKit Cloud project is connected** - You need `LIVEKIT_URL`, `LIVEKIT_API_KEY`, and `LIVEKIT_API_SECRET` from your Cloud project
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3. **Set up documentation access** - Use MCP if available, otherwise use web search
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4. **Plan to write tests** - Every agent implementation MUST include tests (see testing section below)
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5. **Verify all APIs against live docs** - Never rely on model memory for LiveKit APIs
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This checklist applies regardless of whether MCP is available. MCP provides documentation access but does NOT replace the guidance in this skill.
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## LiveKit Cloud Setup
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LiveKit Cloud is the fastest way to get a voice agent running. It provides:
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- Managed infrastructure (no servers to deploy)
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- **LiveKit Inference** for AI models (no separate API keys needed)
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- Built-in noise cancellation, turn detection, and other voice features
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- Simple credential management
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### Connect to Your Cloud Project
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1. Sign up at [cloud.livekit.io](https://cloud.livekit.io) if you haven't already
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2. Create a project (or use an existing one)
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3. Get your credentials from the project settings:
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- `LIVEKIT_URL` - Your project's WebSocket URL (e.g., `wss://your-project.livekit.cloud`)
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- `LIVEKIT_API_KEY` - API key for authentication
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- `LIVEKIT_API_SECRET` - API secret for authentication
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4. Set these as environment variables (typically in `.env.local`):
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```bash
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LIVEKIT_URL=wss://your-project.livekit.cloud
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LIVEKIT_API_KEY=your-api-key
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LIVEKIT_API_SECRET=your-api-secret
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```
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The LiveKit CLI can automate credential setup. Consult the CLI documentation for current commands.
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### Use LiveKit Inference for AI Models
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**LiveKit Inference is the recommended way to use AI models with LiveKit Cloud.** It provides access to leading AI model providers—all through your LiveKit credentials with no separate API keys needed.
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Benefits of LiveKit Inference:
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- No separate API keys to manage for each AI provider
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- Billing consolidated through your LiveKit Cloud account
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- Optimized for voice AI workloads
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Consult the documentation for available models, supported providers, and current usage patterns. The documentation always has the most up-to-date information.
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## Critical Rule: Never Trust Model Memory for LiveKit APIs
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LiveKit Agents is a fast-evolving SDK. Model training data is outdated the moment it's created. When working with LiveKit:
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- **Never assume** API signatures, method names, or configuration options from memory
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- **Never guess** SDK behavior or default values
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- **Always verify** against live documentation before writing code
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- **Always cite** the documentation source when implementing features
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This rule applies even when confident about an API. Verify anyway.
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## REQUIRED: Use LiveKit MCP Server for Documentation
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Before writing any LiveKit code, ensure access to the LiveKit documentation MCP server. This provides current, verified API information and prevents reliance on stale model knowledge.
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### Check for MCP Availability
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Look for `livekit-docs` MCP tools. If available, use them for all documentation lookups:
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- Search documentation before implementing any feature
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- Verify API signatures and method parameters
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- Look up configuration options and their valid values
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- Find working examples for the specific task at hand
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### If MCP Is Not Available
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If the LiveKit MCP server is not configured, inform the user and recommend installation. Installation instructions for all supported platforms are available at:
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**https://docs.livekit.io/intro/mcp-server/**
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Fetch the installation instructions appropriate for the user's coding agent from that page.
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### Fallback When MCP Unavailable
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If MCP cannot be installed in the current session:
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1. **Inform the user immediately** that documentation cannot be verified in real-time
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2. Use web search to fetch current documentation from docs.livekit.io
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3. **Explicitly mark all LiveKit-specific code** with a comment like `# UNVERIFIED: Please check docs.livekit.io for current API`
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4. **State clearly** when you cannot verify something: "I cannot verify this API signature against current documentation"
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5. Recommend the user verify against https://docs.livekit.io before using the code
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## Voice Agent Architecture Principles
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Voice AI agents have fundamentally different requirements than text-based agents or traditional software. Internalize these principles:
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### Latency Is Critical
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Voice conversations are real-time. Users expect responses within hundreds of milliseconds, not seconds. Every architectural decision should consider latency impact:
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- Minimize LLM context size to reduce inference time
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- Avoid unnecessary tool calls during active conversation
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- Prefer streaming responses over batch responses
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- Design for the unhappy path (network delays, API timeouts)
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### Context Bloat Kills Performance
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Large system prompts and extensive tool lists directly increase latency. A voice agent with 50 tools and a 10,000-token system prompt will feel sluggish regardless of model speed.
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Design agents with minimal viable context:
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- Include only tools relevant to the current conversation phase
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- Keep system prompts focused and concise
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- Remove tools and context that aren't actively needed
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### Users Don't Read, They Listen
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Voice interface constraints differ from text:
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- Long responses frustrate users—keep outputs concise
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- Users cannot scroll back—ensure clarity on first delivery
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- Interruptions are normal—design for graceful handling
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- Silence feels broken—acknowledge processing when needed
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## Workflow Architecture: Handoffs and Tasks
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Complex voice agents should not be monolithic. LiveKit Agents supports structured workflows that maintain low latency while handling sophisticated use cases.
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### The Problem with Monolithic Agents
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A single agent handling an entire conversation flow accumulates:
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- Tools for every possible action (bloated tool list)
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- Instructions for every conversation phase (bloated context)
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- State management for all scenarios (complexity)
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This creates latency and reduces reliability.
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### Handoffs: Agent-to-Agent Transitions
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Handoffs allow one agent to transfer control to another. Use handoffs to:
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- Separate distinct conversation phases (greeting → intake → resolution)
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- Isolate specialized capabilities (general support → billing specialist)
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- Manage context boundaries (each agent has only what it needs)
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Design handoffs around natural conversation boundaries where context can be summarized rather than transferred wholesale.
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### Tasks: Scoped Operations
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Tasks are tightly-scoped prompts designed to achieve a specific outcome. Use tasks for:
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- Discrete operations that don't require full agent capabilities
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- Situations where a focused prompt outperforms a general-purpose agent
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- Reducing context when only a specific capability is needed
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Consult the documentation for implementation details on handoffs and tasks.
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## REQUIRED: Write Tests for Agent Behavior
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Voice agent behavior is code. Every agent implementation MUST include tests. Shipping an agent without tests is shipping untested code.
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### Mandatory Testing Workflow
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When building or modifying a LiveKit agent:
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1. **Create a `tests/` directory** if one doesn't exist
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2. **Write at least one test** before considering the implementation complete
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3. **Test the core behavior** the user requested
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4. **Run the tests** to verify they pass
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### Test-Driven Development Process
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When modifying agent behavior—instructions, tool descriptions, workflows—begin by writing tests for the desired behavior:
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1. Define what the agent should do in specific scenarios
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2. Write test cases that verify this behavior
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3. Implement the feature
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4. Iterate until tests pass
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This approach prevents shipping agents that "seem to work" but fail in production.
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### What Every Agent Test Should Cover
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At minimum, write tests for:
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- **Basic conversation flow**: Agent responds appropriately to a greeting
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- **Tool invocation** (if tools exist): Tools are called with correct parameters
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- **Error handling**: Agent handles unexpected input gracefully
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Focus tests on:
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- **Tool invocation**: Does the agent call the right tools with correct parameters?
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- **Response quality**: Does the agent produce appropriate responses for given inputs?
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- **Workflow transitions**: Do handoffs and tasks trigger correctly?
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- **Edge cases**: How does the agent handle unexpected input, interruptions, silence?
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### Test Implementation Pattern
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Use LiveKit's testing framework. Consult the testing documentation via MCP for current patterns:
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```
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search: "livekit agents testing"
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```
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The framework supports:
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- Simulated user input
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- Verification of agent responses
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- Tool call assertions
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- Workflow transition testing
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### Why This Is Non-Negotiable
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Agents that "seem to work" in manual testing frequently fail in production:
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- Prompt changes silently break behavior
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- Tool descriptions affect when tools are called
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- Model updates change response patterns
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Tests catch these issues before users do.
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### Skipping Tests
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If a user explicitly requests no tests, proceed without them but inform them:
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> "I've built the agent without tests as requested. I strongly recommend adding tests before deploying to production. Voice agents are difficult to verify manually and tests prevent silent regressions."
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## Common Mistakes to Avoid
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### Overloading the Initial Agent
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Starting with one agent that "does everything" and adding tools/instructions over time. Instead, design workflow structure upfront, even if initial implementation is simple.
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### Ignoring Latency Until It's a Problem
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Latency issues compound. An agent that feels "a bit slow" in development becomes unusable in production with real network conditions. Measure and optimize latency continuously.
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### Copying Examples Without Understanding
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Examples in documentation demonstrate specific patterns. Copying code without understanding its purpose leads to bloated, poorly-structured agents. Understand what each component does before including it.
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### Skipping Tests Because "It's Just Prompts"
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Agent behavior is code. Prompt changes affect behavior as much as code changes. Test agent behavior with the same rigor as traditional software. **Never deliver an agent implementation without at least one test file.**
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### Assuming Model Knowledge Is Current
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Reiterating the critical rule: never trust model memory for LiveKit APIs. The SDK evolves faster than model training cycles. Verify everything.
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## When to Consult Documentation
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**Always consult documentation for:**
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- API method signatures and parameters
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- Configuration options and their valid values
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- SDK version-specific features or changes
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- Deployment and infrastructure setup
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- Model provider integration details
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- CLI commands and flags
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**This skill provides guidance on:**
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- Architectural approach and design principles
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- Workflow structure decisions
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- Testing strategy
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- Common pitfalls to avoid
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The distinction matters: this skill tells you *how to think* about building voice agents. The documentation tells you *how to implement* specific features.
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## Feedback Loop
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When using LiveKit documentation via MCP, note any gaps, outdated information, or confusing content. Reporting documentation issues helps improve the ecosystem for all developers.
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## Summary
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Building effective voice agents with LiveKit Cloud requires:
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1. **Use LiveKit Cloud + LiveKit Inference** as the foundation—it's the fastest path to production
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2. **Verify everything** against live documentation—never trust model memory
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3. **Minimize latency** at every architectural decision point
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4. **Structure workflows** using handoffs and tasks to manage complexity
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5. **Test behavior** before and after changes—never ship without tests
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6. **Keep context minimal**—only include what's needed for the current phase
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These principles remain valid regardless of SDK version or API changes. For all implementation specifics, consult the LiveKit documentation via MCP.
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# Freshness Rules for LiveKit Development
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This document provides detailed guidance on maintaining accuracy when building with LiveKit Agents. These rules exist because model training data becomes outdated immediately, and LiveKit's SDK evolves rapidly.
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## The Core Problem
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Coding agents (Claude, GPT, etc.) are trained on historical data. This training includes:
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- Old versions of LiveKit documentation
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- Outdated code examples from blogs and tutorials
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- Previous SDK versions with different APIs
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- Community answers that may no longer be accurate
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When an agent "knows" something about LiveKit, that knowledge may be months or years out of date.
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## Verification Requirements
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### Before Writing Any LiveKit Code
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1. **Identify what needs verification**
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- Method names and signatures
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- Configuration options and their types
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- Import paths and module structure
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- Default values and behaviors
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2. **Query the documentation**
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- Use MCP to search for the specific feature
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- Read the current documentation, not cached knowledge
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- Look for version notes or recent changes
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3. **Cite your source**
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- Note which documentation page informed the implementation
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- If something cannot be verified, explicitly state this
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### During Implementation
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When writing code, verify:
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| Element | Why It Changes | How to Verify |
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|---------|----------------|---------------|
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| Import statements | Module restructuring | Search docs for current import paths |
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| Method signatures | API evolution | Look up method in API reference |
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| Configuration keys | Naming conventions change | Check configuration documentation |
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| Default behaviors | Defaults are tuned over time | Read parameter documentation |
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| Event names | Event systems evolve | Check events/callbacks documentation |
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### After Implementation
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Before presenting code to the user:
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- Confirm all APIs used are documented
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- Verify example patterns match current best practices
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- Check for deprecation warnings in documentation
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## What Cannot Be Verified
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Some things legitimately cannot be verified against documentation:
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- User's specific environment or configuration
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- Integration with user's existing codebase
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- Business logic and application requirements
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When providing guidance on these topics, clearly distinguish between:
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- "According to LiveKit documentation..." (verified)
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- "Based on your requirements..." (application-specific)
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- "This may need adjustment..." (uncertain)
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## Red Flags: When to Stop and Verify
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Pause and verify against documentation when:
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1. **Writing from memory** - If you're typing an API call without having just looked it up, verify it
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2. **"I think" or "I believe"** - Uncertainty about LiveKit APIs requires verification
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3. **Complex configurations** - Multi-option configurations are likely to have evolved
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4. **Error handling** - Exception types and error formats change
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5. **Newer features** - Recently added features have the highest drift risk
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## Communication with Users
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### When Verified
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```
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According to the LiveKit Agents documentation, the correct approach is...
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[implementation]
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```
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### When Partially Verified
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```
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The workflow structure follows LiveKit's documented patterns. However, I could not
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verify [specific detail] against current documentation. Please confirm this matches
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your SDK version.
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```
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### When Unverified
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```
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I cannot verify this implementation against current LiveKit documentation. This is
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based on general patterns and may require adjustment. I recommend:
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1. Checking the official documentation at [link]
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2. Testing this implementation before relying on it
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```
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## MCP Server Unavailable
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If the LiveKit MCP server is not installed or accessible:
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1. **Inform the user immediately** - They should know verification isn't possible
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2. **Recommend installation** - Point to https://docs.livekit.io/mcp
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3. **Proceed with caution** - Clearly mark all LiveKit-specific code as unverified
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4. **Suggest manual verification** - User should check docs before using the code
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Do not pretend to have verified something when MCP access was unavailable.
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## Version Awareness
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LiveKit Agents has distinct versions with potentially different APIs:
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- Python SDK (`livekit-agents`)
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- Node.js/TypeScript SDK (`@livekit/agents`)
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Each has its own release cycle and API surface. When working with LiveKit:
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- Determine which SDK the user is using
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- Search documentation specific to that SDK
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- Do not assume API parity between Python and Node.js versions
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## Examples of Drift
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These examples illustrate why verification matters:
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### Configuration Changes
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Old tutorials might show:
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```python
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agent = VoiceAgent(config={"model": "gpt-4"})
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```
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Current API might be:
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```python
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agent = VoiceAgent(llm=SomeLLMClass(...))
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```
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### Method Renames
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What was once:
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```python
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agent.start_session()
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```
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Might now be:
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```python
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agent.start()
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```
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### Import Restructuring
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Previous:
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```python
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from livekit.agents.voice import VoiceAgent
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```
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Current:
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```python
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from livekit.agents import VoiceAgent
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```
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None of these changes are predictable from training data. Only live documentation reflects current state.
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## Summary
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1. **Default to distrust** - Assume any LiveKit knowledge from memory is outdated
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2. **Verify actively** - Use MCP to check documentation before implementation
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3. **Communicate uncertainty** - Tell users when something cannot be verified
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4. **Cite sources** - Reference documentation when providing verified information
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5. **Recommend MCP** - If unavailable, make installation a priority
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Block a user