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English
$
USD
I will build a custom mcp server for your API or database
Josh
About this gig
Claude can only work with what you paste into it. An MCP server changes that: it lets Claude read from and act on your actual systems.
WHAT I BUILD
A server that exposes your data as tools Claude can call. Your Postgres, your internal REST API, your file store, your ticket system. You decide what it may read, and whether it may write anything at all.
Safety is structural, not a promise. My own read-only server opens its database with a read-only handle, so writes are refused by the database itself instead of by a keyword filter someone can talk around.
WHY ME
I built a 110+ tool AI agent from scratch, including its own MCP client over stdio, SSE and streamable-HTTP, plus a read-only MCP server on top of its database. 15,000 lines, 72 passing tests.
So I know the failure modes: transports that silently drop servers, tool schemas that burn your token budget, and SDKs that swallow the error so the model repeats the same broken call.
HOW IT WORKS
1. Tell me the source and what Claude should do with it
2. I confirm scope before you order
3. I build, test and hand over with documentation
Message me first and I will say honestly if this fits your case.
Get to know Josh
Josh
AI Agent Developer for Claude Code and MCP Integrations
- FromNetherlands
- Member sinceSep 2020
- Last delivery5 years
Languages
English, Dutch
I build AI agents that connect to real systems, not just chat windows.
Over the past year I built a personal AI assistant from scratch: 110+ tools, multi-provider LLM fallback, semantic tool selection, vector memory, and a custom MCP client supporting stdio, SSE and streamable-HTTP. 15,000 lines, 72 passing tests, running every day.
So I have already hit the failure modes most setups run into: token blowout from oversized tool schemas, transports that silently drop servers, permission handling on Windows.
I work in English and Dutch, and I will tell you honestly if I am not the right fit.
FAQ
What is an MCP server, in plain terms?
A connector that lets Claude read from and act on one of your systems. Without one, Claude only knows what you paste into the chat.
Can Claude change or delete my data?
Only if you ask for it. Read-only is the default, and I enforce it at the connection level so writes are impossible rather than merely discouraged.
What sources can you connect?
Anything with an API or a database driver: Postgres, MySQL, SQLite, REST APIs, file stores. Message me with your source and I will confirm before you order.
Will this work with assistants other than Claude?
Yes. MCP is an open protocol and other assistants support it too, so the server is not locked to one vendor.
Do I need my own Claude account?
Yes, you bring your own. I build and configure everything around it, and I will tell you which plan fits before you order.
