Scalepad MCP Server

scalepad-mcp

MCP server for the ScalePad platform — Core, Lifecycle Manager, ControlMap, Backup Radar, and Quoter — built natively on the MCP SDK v2 (2026-07-28 spec) with dual-era serving: the same endpoint answers both legacy 2025-era initialize-handshake clients and modern envelope clients.

Architecture

Flat tool surface: every tool is exposed upfront in tools/list for universal client compatibility. Navigation tools are discovery aids, not gates.

Product domains

All tools are callable at any time; scalepad_navigate simply summarizes a domain's tools.

Credentials

One ScalePad API key (generated in the ScalePad app by an Administrator) covers every product; endpoints for products without an active subscription return 402.

Copy .env.example and set the variables below. Leave CONDUIT_S2S_SECRET empty in that file.

Environment variables (AUTH_MODE=env, default for stdio/local)

/health and /healthz stay unauthenticated and do not read credentials. The stdio transport does not use CONDUIT_S2S_SECRET.

Gateway headers (AUTH_MODE=gateway, hosted deployment)

In gateway mode credentials are bound per request from these headers. A /mcp request without X-ScalePad-Api-Key is rejected with a 401 JSON-RPC error before any MCP handling and never falls through to env credentials. /health stays unauthenticated.

X-Gateway-S2S signing

With MCP_TRANSPORT=http and CONDUIT_S2S_SECRET set, every /mcp request must include X-Gateway-S2S. A missing or invalid header returns 401 before vendor credentials are read.

The header value is t=<unix seconds>,v1=<hex>. v1 is HMAC-SHA256 (64 lowercase hex characters) of the ASCII string t=<unix seconds>, keyed with CONDUIT_S2S_SECRET. Timestamps more than 300 seconds from the server clock are rejected.

import { createHmac } from "node:crypto";

const t = Math.floor(Date.now() / 1000);
const v1 = createHmac("sha256", process.env.CONDUIT_S2S_SECRET).update(`t=${t}`).digest("hex");
const xGatewayS2s = `t=${t},v1=${v1}`;

Transports

• stdio (default): node dist/index.js — for Claude Desktop / CLI. Does not use CONDUIT_S2S_SECRET.
• HTTP: MCP_TRANSPORT=http node dist/index.js — serves /mcp (dual-era, legacy: 'stateless') plus /health and /healthz. Refuses to start until CONDUIT_S2S_SECRET is a real secret. MCP_HTTP_PORT defaults to 8080. With a secret set, MCP_HTTP_HOST is honored and defaults to 127.0.0.1 when unset. Without a secret, MCP_ALLOW_INSECURE_DEV=1 is the only way to start, and the listener is 127.0.0.1 only.

Development

export NODE_AUTH_TOKEN=$(gh auth token)   # GitHub Packages read access
npm ci
npm run build       # tsup (transpile-only; domains stay lazily importable)
npm test            # vitest (HTTP layer: health, 401 gate, dual-era tools/list, fail-closed S2S)
npm run smoke       # dual-era smoke against dist/index.js (loopback, insecure-dev bypass)
npm run typecheck

Domain handlers live in src/domains/<slug>.ts, each exporting export const handler: DomainHandler (see src/utils/types.ts), and are lazily loaded via src/domains/index.ts.

Local HTTP without a secret:

MCP_TRANSPORT=http MCP_ALLOW_INSECURE_DEV=1 npm start

Docker

The image listens on 0.0.0.0 inside the container (MCP_HTTP_HOST) and defaults to AUTH_MODE=gateway. That bind is safe only because startup refuses to run without a real CONDUIT_S2S_SECRET. Publish the port on loopback and pass the S2S secret. In gateway mode, ScalePad credentials arrive on each request as headers; they are not read from the environment.

docker build --build-arg NODE_AUTH_TOKEN=$(gh auth token) -t scalepad-mcp .
docker run \
  -e CONDUIT_S2S_SECRET="$CONDUIT_S2S_SECRET" \
  -p 127.0.0.1:8080:8080 \
  scalepad-mcp

Compose refuses to start when CONDUIT_S2S_SECRET is unset. The gateway service does not set SCALEPAD_API_KEY, QUOTER_CLIENT_ID, or QUOTER_CLIENT_SECRET, and it does not use env_file, so a project .env cannot inject static vendor credentials into the container. Compose still interpolates CONDUIT_S2S_SECRET from that file. It publishes 127.0.0.1:8080:8080:

CONDUIT_S2S_SECRET="$CONDUIT_S2S_SECRET" docker compose up

Single-tenant HTTP (AUTH_MODE=env) still requires the S2S secret, then uses SCALEPAD_API_KEY:

docker run \
  -e CONDUIT_S2S_SECRET="$CONDUIT_S2S_SECRET" \
  -e AUTH_MODE=env \
  -e SCALEPAD_API_KEY=your-value \
  -e SCALEPAD_REGION=us \
  -p 127.0.0.1:8080:8080 \
  scalepad-mcp

Local HTTP without a secret is development-only. It binds 127.0.0.1 only (a non-loopback MCP_HTTP_HOST, including 0.0.0.0, is overridden) and logs a warning:

MCP_TRANSPORT=http MCP_ALLOW_INSECURE_DEV=1 npm start

The image defaults to AUTH_MODE=gateway for hosted deployment behind the WYRE MCP gateway.

License

Apache-2.0 — see LICENSE.