Klaviyo Security Basics

What it does

When your agent uses it

• Securing API keys
• Configuring OAuth scopes
• Implementing webhook signature verification
• Auditing Klaviyo security configuration

Example prompts

• “klaviyo security”
• “klaviyo secrets”
• “secure klaviyo”
• “/klaviyo-security-basics”

Requirements

• A credential in KLAVIYO_PRIVATE_KEY
• A credential in KLAVIYO_PUBLIC_KEY
• Compatibility (from SKILL.md): Designed for Claude Code
• Pre-approved tools (allowed-tools): Read, Write, Edit, Grep

Workflow steps

5 steps, taken from the step headings in SKILL.md.

1. 1Understand Key Types
2. 2Store Keys in Environment Variables
3. 3Scope Keys per Environment (Least Privilege)
4. 4Verify Webhook Signatures (HMAC-SHA256)
5. 5Rotate Keys with Zero Downtime

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Grep

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • git

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • developers.klaviyo.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • KLAVIYO_PRIVATE_KEY
  • KLAVIYO_PUBLIC_KEY
  • KLAVIYO_WEBHOOK_SIGNING_SECRET

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Designed for Claude Code

  From compatibility in the SKILL.md frontmatter.

Context cost

Klaviyo Security Basics loads about 1.6k tokens when it runs, and up to ~3.2k if it reads all its reference files. Until then it costs about 94 tokens; SKILL.md has 581 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~94

When it runs · the whole SKILL.md, loaded when a task matches

~1.6k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:52

  from `.env` (git-ignored) through a validated config loader that throws on a

• NoteMentions a .env fileSKILL.md:64

  Full `.env` template, `.gitignore` entries, and the `requireEnv` helper:

• NoteMentions a .env fileSKILL.md:103

  - [ ] `.env` files in `.gitignore`

• NoteMentions a .env fileSKILL.md:126

  - A git-ignored `.env` plus a `src/config/klaviyo.ts` loader that fails fast on a

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 581 words, ~1,626 tokens.

name

klaviyo-security-basics

description

Apply Klaviyo security best practices for API key management and access control. Use when securing API keys, configuring OAuth scopes, implementing webhook signature verification, or auditing Klaviyo security configuration. Trigger with phrases like "klaviyo security", "klaviyo secrets", "secure klaviyo", "klaviyo API key security", "klaviyo OAuth".

allowed-tools

Read, Write, Edit, Grep

compatibility

Designed for Claude Code

version

1.7.0

license

MIT

author

Jeremy Longshore <jeremy@intentsolutions.io>

tags

saas, klaviyo, email-marketing, cdp

// src/config/klaviyo.ts -- validated config loader (skeleton)
export const klaviyoConfig = {
  privateKey: requireEnv('KLAVIYO_PRIVATE_KEY'),        // throws if absent
  publicKey: process.env.KLAVIYO_PUBLIC_KEY || '',
  webhookSecret: process.env.KLAVIYO_WEBHOOK_SIGNING_SECRET || '',
};

const expected = crypto.createHmac('sha256', secret)
  .update(rawBody).digest('base64');
return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));

POST /webhooks/klaviyo  (tampered body, original signature)
  → verifyKlaviyoWebhookSignature() recomputes HMAC → mismatch
  → 401 { "error": "Invalid signature" }, logged as rejected

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/.curated/klaviyo-security-basics of jeremylongshore/tons-of-skills-marketplace.

• SKILL.md
• references/examples.md
• references/implementation.md

Open the folder on GitHubat commit cfae287