otp.com in Claude Code

Add the otp.com skill to your project and Claude Code loads the integration steps whenever the task is OTP verification, then writes the send and verify calls into your code.

Get Your API Key Free
mkdir -p .claude/skills/otp && curl -fsSL https://otp.com/ai/files/claude-code/SKILL.md -o .claude/skills/otp/SKILL.md
Claude Code
Ready
  1. Loaded the otp skill .claude/skills/otp/SKILL.md
  2. Read the API key OTP_API_KEY · server env
  3. Added the send call
    SMSWhatsAppTelegramEmail
  4. Added the verify call POST /otp/verify
Add otp.com phone verification to the signup flow.
Claude Code · Skill

Set up otp.com in Claude Code

Create an API key in the panel (API Keys). Start with an otp_test_ key. Install the skill with the command below, or download the file and save it at .claude/skills/otp/SKILL.md. Ask for the integration. The agent writes the send and verify calls into your code, with the key read from OTP_API_KEY on the server.

mkdir -p .claude/skills/otp && curl -fsSL https://otp.com/ai/files/claude-code/SKILL.md -o .claude/skills/otp/SKILL.md
Download SKILL.md

A project skill. Claude Code reads its description and loads the integration steps when the task is about OTP verification.

What to ask once the file is in place

my-app · claude · 80×24
james@macmy-app% claude
> Add phone verification to sign-up with otp.com: send a code when the user submits their number, then verify it.
● Reading .claude/skills/otp/SKILL.md
● Editing src/auth/signup.ts
✓ Send and verify calls added
EXAMPLE PROMPT

Add phone verification to sign-up with otp.com: send a code when the user submits their number, then verify it.

my-app · claude · 80×24
james@macmy-app% claude
> Read https://otp.com/ai/prompt.md and integrate otp.com OTP verification into this project.
● Fetching otp.com/ai/prompt.md
● Step 1: POST /otp/send
✓ Step 2: POST /otp/verify wired in
OR POINT IT AT THE FILE

Read https://otp.com/ai/prompt.md and integrate otp.com OTP verification into this project.

Full integration prompt as Markdown →

Other AI tools

Cursor Rules file Set up → Codex AGENTS.md Set up → GitHub Copilot Instructions file Set up → n8n REST API Set up → Make REST API Set up → Replit Agent Prompt Set up → Lovable Prompt Set up →

Frequently Asked Questions

Is my API key safe?

Keep the key in an environment variable or a secret on your server (OTP_API_KEY), never in the rules file or the prompt, and never commit it. Use a test key (otp_test_) while you build.

Does the agent see the code?

No. The API never returns the code. The user receives it on their phone or in their inbox, and your app verifies what they type against the otp_id from the send call.

Can I test without sending real messages?

Yes. A test key (otp_test_) runs in the sandbox: send returns a real otp_id and a pending status, but nothing is delivered and nothing is charged. Verify accepts the fixed code 123456 on the default 6-digit length.

Can Claude Code also run the MCP server?

Yes. The MCP server is a separate thing: it lets an agent send and verify codes for real users at runtime. It is not needed to write the integration. See the MCP server docs.