Rtcf MCP Server

by hengkp Your server? Claim it

not responding

Rtcf is listed as active in the registry but did not answer our last check. It exposes 3 tools. Last commit 12 Jul 2026.

Turns rough requests into sharp Role/Task/Context/Format prompts. Thai and English.

Uptime history 91 days of history · worst day 0%

91 days agonow

13.2%

Uptime 24h

12 of 91 checks

Tools

read from the server

343 ms

Response time

average over 24h

Stars

last commit 12 Jul 2026

What changed 3

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 23 August 2026. No other catalogue keeps this.

23 Aug a tool appeared improve_followup

23 Aug a tool description was rewritten improve_prompt

23 Aug a tool changed the parameters it asks for improve_prompt

Rtcf does not always answer

Over the last week it answered 7.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add rtcf --transport http https://rtcf.happlen.com/api/mcp

Settings → Connectors → Add custom connector, then paste this address

https://rtcf.happlen.com/api/mcp

~/.codex/config.toml

[mcp_servers.rtcf]
url = "https://rtcf.happlen.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "rtcf": {
      "url": "https://rtcf.happlen.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "rtcf": {
      "type": "http",
      "url": "https://rtcf.happlen.com/api/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

improve

improve_followup

Write the user's NEXT message for an AI conversation that is already in progress (a follow-up). Use when the user wants to refine, deepen, or continue earlier work in this conversation. Do NOT use it for a brand-new task (use improve_prompt for that). Returns a short, ready-to-send continuation message that anchors to the existing work instead of restarting it. Requires an API key (add ?key=rk_live_... to the connector URL).

improve_prompt

Rewrite a rough prompt into a sharper, ready-to-use prompt structured as Role, Task, Context, Format (RTCF). Returns the improved prompt, its four parts, a short list of clarifying questions worth asking the user, and which model tier and effort level suit this kind of work. Use this before answering when the user's request is vague, or when the user asks to improve a prompt.

build

build_prompt

Compose a ready-to-use prompt from explicit Role, Task, Context, and Format parts. Use when the user already knows the pieces and wants them woven into one clean prompt.

Endpoints

URL	Transport	State	Latency	Checked
https://rtcf.happlen.com/api/mcp	streamable-http	answering	86 ms	5 min ago

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Rtcf — questions

Answers built from our own checks of this server.

What can Rtcf do?

It exposes 3 tools, read directly from the server on our last check. Among them: build_prompt, improve_followup, improve_prompt. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Rtcf working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 12 of 91 checks got a reply (13.2%), average response time 343 ms. The bar chart above shows every period we have measured.

The registry lists Rtcf as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Rtcf?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Rtcf need an API key?

No. Rtcf completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Rtcf?

It answers our handshake in 343 ms on average, which is faster than 41% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Rtcf open source?

We cannot say either way: 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.