Primitive SDKs

Monorepo for the Primitive SDKs.

Primitive is an inbound and outbound email platform. The SDKs are centered on a small default workflow:

1. receive an inbound email
2. inspect a normalized email object
3. send, reply, or forward synchronously

SDKs

SDK	Install target	README
Node.js	npm install @primitivedotdev/sdk	sdk-node/README.md
Python	pip install primitivedotdev	sdk-python/README.md
Go	go get github.com/primitivedotdev/sdks/sdk-go/v2@latest	sdk-go/README.md

Default API shape

Across the SDKs, the default story is:

• receive inbound mail with receive(...)
• create an outbound client with client(...)
• send new mail with send(...)
• continue a thread with reply(...)
• forward a message with forward(...)

The Node.js end-state looks like this:

import primitive from "@primitivedotdev/sdk";

const client = primitive.client({
  apiKey: process.env.PRIMITIVE_API_KEY!,
});

export async function POST(req: Request) {
  const email = await primitive.receive(req, {
    secret: process.env.PRIMITIVE_WEBHOOK_SECRET!,
  });

  await client.reply(email, "Thank you for your email.");

  return Response.json({ ok: true });
}

x402 payments

Each SDK also ships a non-custodial x402 payments client. One agent registers a payout address and requests a USDC payment; the paying agent signs locally with its own key and settles. Keys never leave the caller. Networks are base and base-sepolia, and amounts are token base units (USDC has 6 decimals, so "10000" is 0.01 USDC). See the "x402 payments" section in each SDK README (sdk-node, sdk-python, sdk-go) for runnable examples, and the primitive payments command group in the CLI for the same flow from a terminal.

Advanced surfaces

The low-level and generated APIs still exist for advanced use cases:

• webhook verification/parsing helpers
• generated HTTP API packages
• Primitive Memories key-value operations
• OpenAPI exports
• contract tooling
• raw MIME parsing helpers
• CLI

The SDK refresh keeps those escape hatches available, but the primary docs story focuses on the inbound/outbound automation flow above.

Repository layout

sdks/
  .github/workflows/
  openapi/
  json-schema/
  sdk-go/
  sdk-node/
  sdk-python/
  test-fixtures/

Development

Use the root Makefile as the main task interface:

make node-generate python-generate go-generate
make check
make build
make shared-check

The Makefile wraps each SDK's native commands. You can still run them directly from each SDK directory when needed:

cd sdk-node && pnpm typecheck && pnpm test
cd sdk-python && uv sync --dev && uv run pytest && uv run ruff check . && uv run basedpyright
cd sdk-go && go test ./... && go test -run TestSharedCompatibilityFixtures ./...

Documentation

• docs/architecture.md gives the repository architecture and package layout
• docs/schema-generation.md documents schema/codegen flow
• docs/repo-model.md documents the monorepo task model
• RELEASE.md documents the release process

Primitive developer resources

Everything for building on primitive.dev, the email API for AI agents:

• Primitive API documentation — docs.primitive.dev/docs (REST reference: /docs/api)
• Primitive OpenAPI spec — primitive.dev/openapi.json
• Primitive authentication guide — /docs/auth
• Primitive webhooks — /docs/endpoints
• Primitive MCP server (Claude & ChatGPT connector) — /docs/connectors
• Primitive CLI — npm install -g primitive
• Full developer-resources index — primitive.dev/developers