lettr
Skill0 starsChanged 5 months agoMITView on GitHub
Use when working with the Lettr email platform in a user's codebase — installing the SDK, sending transactional email, authoring templates, managing audience and campaigns, wiring webhooks, and diagnosing delivery problems. Routes to the matching sub-skill.
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Lettr
Lettr is an email platform — transactional sending plus marketing (audience + campaigns). These skills cover working with it in code across 6 official SDKs (PHP, Node, Python, Go, Rust, Java) plus the Laravel framework integration.
Sub-skills
| Skill | Use when |
install | Adding Lettr to a project for the first time. Picks the right SDK based on the stack, configures the key, verifies a sending domain. |
sending | Sending transactional email — HTML/text/template, attachments, cc/bcc, tracking, batch, scheduling, idempotency. |
templates | Writing or editing a Lettr-managed template, validating merge tags, previewing. |
audience | Managing lists, contacts (incl. double opt-in, bulk import), topics, properties, and segments. |
campaigns | Sending, scheduling, or reporting on dashboard-authored campaigns. |
webhooks | Registering webhook endpoints and writing the event handler (auth, fast-ack, idempotency). |
diagnose | An email isn't delivering, a domain won't verify, a webhook is silent, or quotas/rate-limits are firing. |
Shared resources
_shared/detect-stack.md— how every skill resolves the project's<lang>._generated/sdk/<lang>/<topic>.md— exact, current SDK calls per language. Generated from the Lettr docs/SDKs; never hand-edited._generated/api/index.md— condensed catalog of all API endpoints, with the fullopenapi.jsonbundled alongside for deep reads.
Maintainers: _generated/ is built by npm run sync from ../lettr-docs + the SDK repos — see README.md.
Common context
- Base URL:
https://app.lettr.com/api - Auth:
Authorization: Bearer $LETTR_API_KEY - API key format:
lttr_… - Rate limit: 3 requests/second per team (429 = back off and retry).
- Optional: the Lettr MCP server gives agents direct API access; these skills work with or without it.
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