# Telnyx Development — Documentation Index
> Account setup, authentication, API fundamentals, SDKs, CLI, MCP servers, and integration guides. One section of the Telnyx developer docs (https://developers.telnyx.com).
> Root index: https://developers.telnyx.com/llms.txt · Full content for this section: https://telnyx.com/llms/development-full.txt

## Subsections

Focused per-subsection files (index + full content):

- [Account setup](https://telnyx.com/llms/development/account-setup.txt) ([full](https://telnyx.com/llms/development/account-setup-full.txt))
- [APIs fundamentals](https://telnyx.com/llms/development/apis-fundamentals.txt) ([full](https://telnyx.com/llms/development/apis-fundamentals-full.txt))
- [Server-side SDKs](https://telnyx.com/llms/development/server-side-sdks.txt) ([full](https://telnyx.com/llms/development/server-side-sdks-full.txt))
- [Telnyx CLI](https://telnyx.com/llms/development/telnyx-cli.txt) ([full](https://telnyx.com/llms/development/telnyx-cli-full.txt))
- [Development Tools](https://telnyx.com/llms/development/development-tools.txt) ([full](https://telnyx.com/llms/development/development-tools-full.txt))

## Account setup

- [Create Account](https://developers.telnyx.com/docs/account-setup/create-account.md): Step-by-step guide to create and set up your Telnyx account for accessing APIs and services.
- [Account Signup](https://developers.telnyx.com/docs/account-setup/signup.md): Understand the trust and safety checks applied to every Telnyx signup attempt.
- [Account Levels Overview](https://developers.telnyx.com/docs/account-setup/levels-and-capabilities.md): Understand how Telnyx accounts are categorized and what distinguishes each framework.
- [Trial Account](https://developers.telnyx.com/docs/account-setup/levels-and-capabilities/trial.md): Capabilities, restrictions, and daily limits applied to Telnyx trial accounts.
- [Using Your Trial Account](https://developers.telnyx.com/docs/account-setup/using-trial-account.md): Recommended process to get the most value from Telnyx trial credits.
- [Paid Account](https://developers.telnyx.com/docs/account-setup/levels-and-capabilities/paid.md): Capabilities and restrictions for paid Telnyx accounts — expanded number purchasing, messaging throughput, and product access beyond trial accounts.
- [Verified Account](https://developers.telnyx.com/docs/account-setup/levels-and-capabilities/verified.md): Capabilities that remain restricted after verification and how to request enterprise access.
- [Account Upgrade](https://developers.telnyx.com/docs/account-setup/account-upgrade.md): Actions required to advance from trial to paid, verified, and enterprise Telnyx accounts.
- [Data Locality](https://developers.telnyx.com/docs/account-setup/data-locality.md): Choose where your Telnyx data is stored at rest. Available regions are the US, Germany (EU), and Australia.

## APIs fundamentals

- [Create API Keys](https://developers.telnyx.com/development/api-fundamentals/create-api-keys.md): Step-by-step guide to create, manage, and secure your Telnyx API keys for all services.
- [API Authentication](https://developers.telnyx.com/development/api-fundamentals/authentication.md): Authentication methods and security best practices for all Telnyx APIs.
- [HTTP Patterns](https://developers.telnyx.com/development/api-fundamentals/request-response.md): Universal patterns for making requests and handling responses across all Telnyx APIs.
- [API error codes](https://developers.telnyx.com/development/api-fundamentals/api-errors.md): Comprehensive reference of all Telnyx API error codes with descriptions and solutions.
- [Rate Limiting](https://developers.telnyx.com/development/api-fundamentals/reliability/rate-limiting.md): Understand rate limits on the Telnyx REST API, including limit headers, retry strategies, and best practices for handling 429 responses across all services.
- [API Reliability & Retries](https://developers.telnyx.com/development/api-fundamentals/reliability/command-retries.md): Best practices for handling API errors, implementing retries, and building resilient integrations across all Telnyx services.
- [Webhook Fundamentals](https://developers.telnyx.com/development/api-fundamentals/webhooks/receiving-webhooks.md): Receive, handle, and secure webhooks from Telnyx APIs. Covers webhook setup, signature verification, payload structure, and retries for Voice, SMS, and Fax.
- [Parameters & Field Names](https://developers.telnyx.com/development/api-fundamentals/data-standards/parameters-fields.md): Comprehensive guide to Telnyx API parameter and field naming conventions, data types, and formatting standards.

## Server-side SDKs

- [Node.js](https://developers.telnyx.com/development/sdk/node.md): The official Telnyx Node.js SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.
- [Python](https://developers.telnyx.com/development/sdk/python.md): The official Telnyx Python SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.
- [PHP](https://developers.telnyx.com/development/sdk/php.md): The official Telnyx PHP SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.
- [Java](https://developers.telnyx.com/development/sdk/java.md): The official Telnyx Java SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.
- [Ruby](https://developers.telnyx.com/development/sdk/ruby.md): The official Telnyx Ruby SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.
- [Go](https://developers.telnyx.com/development/sdk/golang.md): The official Telnyx Go SDK for server-side applications, covering messaging, voice, numbers, WebRTC, and the rest of the Telnyx REST API surface.

## Telnyx CLI

- [Overview](https://developers.telnyx.com/development/cli.md): The Telnyx CLI is the official command-line interface for managing phone numbers, messaging, calls, and other Telnyx resources from your terminal.
- [Install](https://developers.telnyx.com/development/cli/getting-started/install.md): Install the Telnyx CLI on macOS, Windows, or Linux using Homebrew, the install script, or by downloading a prebuilt binary for your platform.
- [Quickstart](https://developers.telnyx.com/development/cli/getting-started/quickstart.md): Install the Telnyx CLI, configure authentication, and run your first command in five minutes — send a message, list numbers, or place a call.
- [Authentication](https://developers.telnyx.com/development/cli/getting-started/authentication.md): Authenticate the Telnyx CLI by setting the TELNYX_API_KEY environment variable so commands can call Telnyx APIs on your account's behalf.
- [Scripting & Automation](https://developers.telnyx.com/development/cli/general-usage.md): Automate workflows with the Telnyx CLI using output formats, filtering, and JSON parsing — patterns for shell scripts, cron jobs, and CI/CD pipelines.
- [Command Reference](https://developers.telnyx.com/development/cli/reference.md): Comprehensive reference for every Telnyx CLI command, auto-generated from the Telnyx REST API with options, examples, and per-resource usage notes.
- [10DLC Registration](https://developers.telnyx.com/development/cli/workflows/10dlc.md): Register your business for US A2P 10DLC messaging using the Telnyx CLI, from brand creation through campaign approval, with copy-paste shell commands.
- [Troubleshooting](https://developers.telnyx.com/development/cli/troubleshooting.md): Troubleshoot common Telnyx CLI errors including authentication failures, missing API keys, and request errors, with solutions mapped to API error codes.
- [Overview](https://developers.telnyx.com/development/cli/legacy.md): Documentation for the deprecated @telnyx/api-cli Node.js package. For new projects use the current Telnyx CLI with simpler authentication.
- [Installation](https://developers.telnyx.com/development/cli/legacy/install.md): Install the deprecated @telnyx/api-cli Node.js CLI for legacy projects. New projects should use the current Telnyx CLI for better support.
- [Authentication](https://developers.telnyx.com/development/cli/legacy/authentication.md): Configure API keys and switch between multiple authentication profiles in the deprecated @telnyx/api-cli legacy Node.js CLI.
- [Command Reference](https://developers.telnyx.com/development/cli/legacy/reference.md): Complete command reference for the deprecated @telnyx/api-cli Node.js CLI, retained for legacy projects. New projects should use the current Telnyx CLI.

## Development Tools

- [Postman Setup](https://developers.telnyx.com/development/development-tools/postman-setup.md): Configure Postman with the Telnyx OpenAPI collection and environment variables to send authenticated requests against every Telnyx product API.
- [ngrok Setup](https://developers.telnyx.com/development/development-tools/ngrok-setup.md): Telnyx's ngrok setup guide allows developers to easily create
- [Node-RED](https://developers.telnyx.com/development/development-tools/node-red.md): Build Telnyx integrations visually with Node-RED. Install the @telnyx/node-red-telnyx package to wire SMS, voice, and Call Control flows without code.

## 🤖 For AI Agents

- [Local MCP Server](https://developers.telnyx.com/development/mcp/local-mcp.md): Install and configure the Telnyx Local MCP server so AI assistants like Claude Desktop can call Telnyx APIs as tools for agentic developer workflows.
- [Remote MCP](https://developers.telnyx.com/development/mcp/remote-mcp.md): Integrate Telnyx services with Claude and other AI assistants without running a local MCP server.
- [Agent Skills](https://developers.telnyx.com/development/agent-skills.md): Build Telnyx integrations in natural language with Agent Skills for Claude Code and other AI coding agents. Supports all 36 Telnyx products via skill files.