Rayfin is a managed Backend-as-a-Service platform that creates and operates application backends from data models defined with TypeScript decorators. It provides databases, authentication, APIs, storage, and hosting for teams building applications. Its catalogue skill and plugin help coding agents create and work with Rayfin projects.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/microsoft/rayfinInstalling this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.
Wrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/mcp/microsoft/rayfin/raymcp)<a href="https://agentmods.dev/mcp/microsoft/rayfin/raymcp"><img src="https://agentmods.dev/badge/mcp/microsoft/rayfin/raymcp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/mcp/microsoft/rayfin/raymcp"><img src="https://agentmods.dev/badge/mcp/microsoft/rayfin/raymcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
raymcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
{
"raymcp": {
"command": "node",
"args": [
"packages/tools/mcp/scripts/main",
"start"
],
"type": "stdio"
}
}What else .mcp.json configures
This page is one entry in a file that holds 3. Installing the file brings all of them; each is measured and scanned on its own page.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 10 lines scan A 9227fc6f7158
raymcp is an MCP server published in the GitHub repository microsoft/rayfin (641 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-09.
Other mcp servers, from other repositories
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component-explorer
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vscode-automation-mcp
MCP server "vscode-automation-mcp" as configured in microsoft/vscode. Launched with npm --prefix test/mcp run start-stdio.
reference-langchain
MCP server "reference-langchain", hosted remotely at reference.langchain.com, as configured in langchain-ai/langchain.
playwright-test
A high-level API to automate web browsers. Runs locally from the playwright npm package.
rea
Reverse engineer anything from your terminal or agent with one CLI and MCP server. Runs locally from the rea-agents npm package.