MCP as a core feature of every app: HackerNoon's practical guide

A working MCP server in about 15 lines of Python. That is the example James, who builds the to-do app Lakun, uses to illustrate his thesis in an article published on 20 October on HackerNoon: supporting Model Context Protocol is becoming the one feature every app needs, and with each passing month it stops being a differentiator and becomes the bare minimum.

The piece does not announce anything new, but it is telling as a symptom. Almost two years after Anthropic introduced MCP in November 2024, the conversation in product communities is no longer about what the protocol is, but about how long it takes a small team to get its server published.

The argument: chat as the entry point

James starts from an observation: for many people, an assistant's chat window (he mentions Claude Desktop and Cursor) has become the place where work begins. If your app is not connected, users have to leave that conversation to use it. MCP solves this with an open standard that turns the N×M integration problem (custom code for every agent and app combination) into N+M: one server per app and one protocol for every agent.

The author compares the moment to the mobile transition of 2010, with one difference: in his view, everything now moves faster and the barrier to entry is lower. His closing line sums it up: "Your users are already asking their AI for help. The only question is whether your app is one of the answers."

Six steps, from SDK to registry

The most useful part of the text is the practical one:

1. Pick an SDK. There are official SDKs for Python, TypeScript, Java, Kotlin, C#/.NET, Go, Swift, Ruby, PHP and Rust. As shortcuts he recommends FastMCP and Cloudflare's Agents SDK for remote deployments with OAuth.
2. Curate the tools. Pick two or three key workflows instead of exposing the whole API, using verbs users understand: create an invoice, list overdue tasks, search the docs.
3. Implement the server. The FastMCP example defines a `list_invoices` tool with a docstring explaining what it does. That docstring is the documentation the agent reads, and it shapes when the agent decides to use the tool.
4. Test. With MCP Inspector (`npx @modelcontextprotocol/inspector`) in the browser, before connecting it to any client.
5. Deploy. Locally via `stdio` for CLIs and desktop apps, or remotely via Streamable HTTP, with per-user OAuth 2.1 and never a single master API key.
6. Distribute. Register the server on the official MCP Registry, Smithery, mcp.so and PulseMCP, and add "MCP support" to the integrations page next to SSO and REST API.

The text also covers the protocol's three building blocks: tools (executable actions), resources (readable data) and prompts (templates shipped by the app itself). And it makes clear that MCP does not replace the existing REST API; it is a layer on top designed for a new consumer, the agent.

What the story leaves out

The article gets the essentials right, especially when it insists that curating tools matters more than exposing all of them. It is what we see when reviewing third-party MCP servers: the ones that work well have a few tools with precise descriptions; the ones that fail dump dozens of endpoints and leave the model to guess.

But "a weekend of work" is optimistic for anything headed to production. The costly part is not writing the server, but per-user OAuth, least-privilege permissions for each tool, human confirmation on destructive actions and defending against malicious content that reaches the model through results. These are things worth planning before announcing MCP support on your product page, not after.

The urgency also deserves some nuance. MCP support becoming a requirement does not mean any server will do: a poorly described one, with ambiguous tools, can deliver a worse experience than having none, because users will blame your product for the agent's mistakes.

Who this is useful for

For founders and SaaS teams that do not yet have an MCP server, it is a good script to get started. For those who already have one, the list of registries and the advice on docstrings work as a quick checklist.

At ElephantPink we share the diagnosis: a small, well-described MCP server already delivers more than a one-off integration with a single assistant. We would only adjust the timeline: the prototype fits in a weekend; the version you can show a client does not.