MCP Server Development Service
We build custom MCP servers that let Claude Desktop, Cursor and other MCP hosts use your API, internal service or database. You tell us what the model should be able to do; we design a small set of task-shaped tools, handle authentication through environment variables, write the server in TypeScript or Python, test it with MCP Inspector, and hand over the source code with a README and host configs. No OpenAPI spec is required.
Who this is for
The service fits teams and individuals who already know what they want an AI assistant to do with their systems, but do not want to spend the time learning the MCP SDKs, the host config quirks and the error-handling details themselves. Typical situations:
- SaaS and API owners who want customers or their own staff to use the product from Claude Desktop, Cursor or another MCP host.
- Engineering teams with internal tools (helpdesk, admin panels, deploy scripts, reporting APIs) that have no public docs and no OpenAPI spec.
- Data teams who want the model to answer questions from a database through a few safe, read-only queries instead of raw SQL access.
- Developers who started a server with our free generator or the official SDKs and got stuck on auth, errors, or a host that will not load it.
What we build
- Tool design. The model reads every tool name, description and input schema, so we turn your endpoints into a short list of tools that match real tasks, such as
search_ordersorget_invoice, with descriptions written for the model. We start read-only and add write tools deliberately, keeping destructive operations out unless you ask for them. - Auth and environment handling. API keys, bearer tokens, base URLs and tenant IDs are read from environment variables set in the host config or your deployment. They never become tool parameters, so the model never sees or supplies them. For OAuth-protected APIs we agree during scoping how tokens are obtained and refreshed.
- TypeScript or Python. TypeScript uses the official
@modelcontextprotocol/sdkwith Zod schemas; Python uses the officialmcppackage. Pick the language your team will maintain. - Readable errors and safe output. Failed calls come back as tool errors the model can explain or retry (for example “HTTP 404 for order 1042”), with timeouts, URL-encoded IDs and capped response sizes so one large record does not flood the context.
- Transport: stdio first, remote when needed. The default is a local stdio server, which is what Claude Desktop and Cursor launch from a config file; each user runs their own copy with their own token. If several people or a hosted agent must share one server, the MCP specification defines a Streamable HTTP transport for remote servers. That adds hosting and authentication work, so we scope it explicitly instead of including it by default.
How the process works
You email a short brief
What the API does, how it authenticates, which tasks the model should handle, which host you use, and your timeline. The contact page checklist lists what helps.
We reply with a tool list and scope
Usually within 1–2 days: proposed tools and parameters, open questions, what is in and out of scope, and a quote.
We build against a test environment
Ideally a staging API or a read-only token. We never need your production secrets in email.
We test every tool with MCP Inspector
Good input, missing records, bad tokens and an unreachable API, so the model gets a clear result on every path, not only the happy one.
Handover and a round of fixes
You run it in your own host. If something does not match the agreed scope, we fix it.
What you get
| Deliverable | Details |
|---|---|
| Source code | A complete TypeScript or Python project that you own and can change, with dependencies pinned in package.json or requirements.txt/pyproject.toml. |
| README | Install steps, the environment variables each tool needs, the tool list, and how to add another tool. |
| Host configs | Ready-to-paste mcpServers entries for Claude Desktop (claude_desktop_config.json) and Cursor (mcp.json), with absolute paths and an env block. |
| Inspector test notes | The MCP Inspector command and the inputs we used to check success and error cases, so you can re-run them after changes. |
The do-it-yourself alternative
Many MCP servers are small enough to build yourself in an afternoon, and we would rather you do that than pay for something you do not need. Everything below is free and needs no account:
- MCP Server Generator: describe your tools in a form and download a TypeScript or Python project with the schemas and host config already written.
- Create an MCP server without OpenAPI: the step-by-step version of that flow.
- Build an MCP server for an internal API: tested TypeScript and Python code for calling a private REST API with an env-based token and readable errors.
- MCP server template for TypeScript and Python: every generated file explained.
- Connect an MCP server to Claude Desktop and Cursor: config locations and fixes for servers that do not appear.
Several systems behind one server, OAuth or unusual auth, a remote server for a team, a tight deadline, or simply no time to learn the SDKs. If your case is one API with three to five read-only tools, try the guides first; you can still email us if you get stuck.
Get a custom MCP server for your API
Send a few lines about your API, auth, the tools you need and your host. We usually reply within 1–2 days with a proposed tool list and next steps.
FAQ
How much does a custom MCP server cost?
We do not publish fixed prices because the work depends on the number of tools, the auth model and whether the server runs locally or remotely. Email a short description and we reply with a scope and a quote, usually within 1-2 days.
Do I need an OpenAPI spec for you to build an MCP server?
No. Docs, example requests, a Postman collection or access to a staging environment are enough. Many internal APIs have no spec, and a good MCP server exposes a few task-shaped tools rather than every endpoint anyway.
Will the server work in Claude Desktop and Cursor?
Yes. The default delivery is a local stdio server with ready-to-paste configs for Claude Desktop and Cursor. It also works with other MCP hosts that launch stdio servers. If you need a remote server shared by a team, we discuss Streamable HTTP and authentication during scoping.
Who owns the code and where do my credentials go?
You receive the full source code to keep, run and change. Credentials are read from environment variables you set in the host config or your deployment; please do not email real production secrets. A staging or read-only token is the best way to test.
Can I build the MCP server myself instead?
Often, yes. For a handful of tools over one API, the free MCP Server Generator plus the internal API guide and the Claude Desktop and Cursor guide cover most of the work. A custom build makes sense when you lack time, need several systems, complex auth or a remote server.