Klaviyo Migration Deep Dive

What it does

When your agent uses it

• You are moving an email/CDP stack onto Klaviyo — off the deprecated v1/v2 APIs
• Off a competitor ESP (Mailchimp
• Re-platforming gradually with the strangler fig pattern — and need field mapping
• Post-migration validation

Example prompts

• “migrate to klaviyo”
• “klaviyo migration”
• “switch to klaviyo”
• “/klaviyo-migration-deep-dive”

Requirements

• Node.js
• A credential in KLAVIYO_PRIVATE_KEY
• Compatibility (from SKILL.md): Designed for Claude Code
• Pre-approved tools (allowed-tools): Read, Write, Edit, Bash(npm:*), Bash(node:*)

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Legacy v1/v2 to current API — replace deprecated track / identify / v2 subscribe HTTP calls with the klaviyo-api SDK…
2. 2API field mapping — rename v1/v2 fields to the current schema: drop the $ prefix, camelCase everything ($first_name → firstName), and nest…
3. 3Competitor migration — write a transform adapter that maps the competitor's contact shape to a Klaviyo profile, then batch-import (50 per…
4. 4Strangler fig pattern — route traffic through a MigrationRouter behind a feature flag, ramping Klaviyo from 0% to 100% while optionally…
5. 5Post-migration validation — run validateMigration() to compare profile counts, sample data integrity, and list membership against the…

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
  • Bash(npm:*)
  • Bash(node:*)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm

  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
  • martinfowler.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

  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 Migration Deep Dive loads about 1.6k tokens when it runs, and up to ~4.9k if it reads all its reference files. Until then it costs about 117 tokens; SKILL.md has 561 words of instructions outside code blocks.

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

~117

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

~4.9k

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

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). 561 words, ~1,635 tokens.

name

klaviyo-migration-deep-dive

description

Use when you are moving an email/CDP stack onto Klaviyo — off the deprecated v1/v2 APIs, off a competitor ESP (Mailchimp, SendGrid), or re-platforming gradually with the strangler fig pattern — and need field mapping, batch import, and post-migration validation. Trigger with phrases like "migrate to klaviyo", "klaviyo migration", "switch to klaviyo", "klaviyo replatform", "mailchimp to klaviyo", "legacy to klaviyo", "v1 to v2 klaviyo".

allowed-tools

Read, Write, Edit, Bash(npm:*), Bash(node:*)

compatibility

Designed for Claude Code

version

1.7.0

license

MIT

author

Jeremy Longshore <jeremy@intentsolutions.io>

tags

saas, klaviyo, email-marketing, cdp

await profilesApi.createOrUpdateProfile({
  data: {
    type: 'profile',
    attributes: { email: 'user@example.com', firstName: 'Jane', properties: { plan: 'pro' } },
  },
});

© 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-migration-deep-dive of jeremylongshore/tons-of-skills-marketplace.

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

Open the folder on GitHubat commit cfae287