timescale/mcp-boilerplate-node

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# MCP Boilerplate for Node.js This provides some common code for creating a [Model Context Protocol](https://modelcontextprotocol.io/introduction) (MCP) server in Node.js. ## Usage ```bash npm install @tigerdata/mcp-boilerplate ``` Requires Node.js 22.15 or later. See [tiger-skills-mcp-server](https://github.com/tigerdata/tiger-skills-mcp-server) for an example MCP server using this boilerplate. ### Protocol versions The servers from `httpServerFactory` and `stdioServerFactory` serve the [2026-07-28](https://modelcontextprotocol.io/specification/2026-07-28) MCP protocol and the 2025 protocol versions (up to `2025-11-25`) on the same endpoint. The client selects the version. The HTTP server does not use sessions (the 2026-07-28 protocol has none, and they are optional in the 2025 protocol). Each HTTP request gets a new server instance. Thus, the server cannot send requests to a 2025 client (for example, elicitation or sampling), and cannot send it notifications outside of a request (for example, `list_changed`). ### Upgrading from v1 of the MCP SDK This package uses v2 of the [MCP TypeScript SDK](https://github.com/modelcontextprotocol/typescript-sdk) (`@modelcontextprotocol/server`). If your server uses SDK types or APIs directly, see the [SDK migration guide](https://ts.sdk.modelcontextprotocol.io/v2/migration/upgrade-to-v2). In particular: - `zod` must be `^4.2.0`. - `httpServerFactory` no longer has the `stateful` option. Remove `stateful: false` from your options. - `additionalSetup` receives a v2 `McpServer`. - Resource callbacks (`read`, `list`) receive a v2 `ServerContext` (`ctx`) instead of the v1 `extra` object. For example, `extra.signal` is now `ctx.mcpReq.signal`. ### DNS Rebinding Protection MCP servers reachable over HTTP can be targeted by [DNS rebinding attacks](https://en.wikipedia.org/wiki/DNS_rebinding), where a malicious website bypasses the browser same-origin policy by pointing a domain at a localhost (or otherwise private) address to reach a local server. The MCP SDK guards against this by validating the `Host` header against an allow-list. This check is **most useful for localhost / development servers** without HTTPS or authentication. Hosted servers served on public hostnames generally don't need it (and would reject legitimate traffic unless every allowed hostname is listed), so `httpServerFactory` leaves it **disabled by default** — it is opt-in via the `dnsRebindingProtection` option (scoped to the MCP and API mount paths): ```ts import { httpServerFactory } from '@tigerdata/mcp-boilerplate'; await httpServerFactory({ name: 'my-server', context, // Omitted (default): disabled, UNLESS MCP_ALLOWED_HOSTS is set — in which // case protection is enabled using that env var's allow-list. // true: enabled. Uses the MCP_ALLOWED_HOSTS allow-list when set, otherwise // localhost-only (localhost, 127.0.0.1, [::1]). // string[]: enabled with this exact allow-list (MCP_ALLOWED_HOSTS ignored). // Hostnames only, without ports; use [::1] for IPv6. // false: disabled. Always wins, even if MCP_ALLOWED_HOSTS is set. dnsRebindingProtection: true, }); ``` The `MCP_ALLOWED_HOSTS` environment variable can both enable and configure protection without touching code: set it to a comma-separated list of hostnames (e.g. `localhost,127.0.0.1,[::1]`) and protection turns on using that list. It is consulted whenever `dnsRebindingProtection` is omitted or `true`, but is ignored when an explicit `string[]` is passed (that list wins) or when `false` is passed (protection stays off). ### Binding to a specific network interface Separately from Host header validation, you can restrict which network interface the server's socket accepts connections on via the `host` option (forwarded to `app.listen()`). Binding to loopback is an OS-level defense that makes the port unreachable from other machines entirely — useful for localhost/development servers: ```ts await httpServerFactory({ name: 'my-server', context, host: '127.0.0.1', // only accept connections on loopback }); ``` Defaults to the `HOST` environment variable, or all available interfaces when unset. This is independent of `dnsRebindingProtection` and is ignored when an external `app` is provided (the caller owns the server lifecycle). ### Skills Add skills support to your MCP server by leveraging the skills submodule in `@tigerdata/mcp-boilerplate/skills`. See the [Skills README](./src/skills/README.md) for details. ### Logging The exported `log` helper writes to the console (via `stderr`, to avoid interfering with the stdio MCP transport) and emits OpenTelemetry log records. The `CONSOLE_LOG_LEVEL` environment variable sets the minimum severity written to the console: `debug` (the default, writes everything), `info`, `warn`, `error`, or `none` to disable console output entirely. OpenTelemetry log records are always emitted regardless of this setting. ## Eslint Plugin This project includes a custom ESLint plugin to guard against the problematic use of optional parameters for tool inputs. Doing so leads to tools that are incompatible with certain models, such as GPT-5. Add to your `eslint.config.mjs`: ```js import boilerplatePlugin from '@tigerdata/mcp-boilerplate/eslintPlugin'; export default [ // ... your existing config { plugins: { 'mcp-boilerplate': boilerplatePlugin, }, rules: { 'mcp-boilerplate/no-optional-tool-params': 'error', }, }, ]; ``` ## Development ### Build To build the TypeScript project: ```bash ./bun run build ``` This compiles the TypeScript files from `src/` to JavaScript in `dist/`. ### Watch Mode To run TypeScript compilation in watch mode (rebuilds on file changes): ```bash ./bun run watch ``` ### Linting This project uses ESLint for code linting with TypeScript support. To run the linter: ```bash ./bun run lint ``` To automatically fix linting issues where possible: ```bash ./bun run lint --write ``` ### Continuous Integration The project includes GitHub Actions that automatically run linting checks on all pushes and pull requests to ensure code quality standards are maintained.

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