A procedure for adding a Rayfin backend to an app, including database entities, permissions, and a client connection. Rayfin is used here as the app's backend and data service, and the procedure only applies when its feature is enabled.

Use it when explicitly adding a database backend, creating data models and permissions, or connecting the app's client to Rayfin.

It provides a checked setup path for adding stored data without bypassing dependency or feature-gate errors.

add-backend — Skill for Claude Code by microsoft/managed-apps

About the project

Microsoft Managed Apps is a project for building custom web applications with React, TypeScript, and Vite, and it provides Microsoft's official templates and development tooling. Developers use its SDK, CLI, and Vite plugin to create and manage these applications. Its catalogue add-ons help AI coding agents build Microsoft Managed Apps.

microsoft/managed-apps · 36 stars · on GitHub

Install

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.

Any agent

npx skills add microsoft/managed-apps --skill add-backend

Clone the repo

git clone --depth 1 https://github.com/microsoft/managed-apps

Made for: Claude Code.

Or install microsoft-managed-apps, the plugin that ships this one along with the rest of its 22 skills, 1 agent.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/microsoft/managed-apps/add-backend/github.svg)](https://agentmods.dev/skills/microsoft/managed-apps/add-backend)

Your own site

<a href="https://agentmods.dev/skills/microsoft/managed-apps/add-backend"><img src="https://agentmods.dev/badge/skills/microsoft/managed-apps/add-backend/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/microsoft/managed-apps/add-backend"><img src="https://agentmods.dev/badge/skills/microsoft/managed-apps/add-backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 489 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00046	$0.00489
Opus 5.5	$0.00018	$0.00196
Sonnet 5.5	$0.00009	$0.00098
Haiku 4.5	$0.00005	$0.00049

Measured 4d ago against content hash 7dbfb00dfcbe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-backend 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 4d 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.

plugins/microsoft-managed-apps/skills/add-backend/SKILL.md · 55 lines

What it actually says

Shared instructions: shared-instructions.md

Add an app backend

Required first: pass the Rayfin feature gate.

1. Set up the database

If rayfin/rayfin.yml exists, use the existing configuration. Otherwise, run:

ms app add backend --provider rayfin --json

This creates the backend configuration, TypeScript configuration and rayfin/data/. Keep the existing app layout and exclude rayfin/.temp/ from version control.

This prepares the app's backend definitions; it does not provision a database. Rayfin is the app backend, not an existing database to select or connect to.

2. Install dependencies

Run from the app root before continuing so the declared dependencies and their version-matched docs are available in node_modules:

npm install

Use the app's existing package manager and lockfile if it does not use npm. Report installation or peer-dependency errors; do not force-install or downgrade the app to bypass them. Add missing direct dependencies only as required by the implementation described in the references.

3. Implement and check the app

Read the installed package docs identified in these references, then follow them in order:

Data modeling: entities, permissions and required Managed Apps host initialization.
CRUD UI: lists, forms, mutations and persistence checks.

When invoked from /create-app, complete data modeling in Step 9 and return the entity/client paths; that workflow handles UI implementation and checks in Steps 10-11. Standalone use continues through both references.

4. Follow the app lifecycle

Use the normal app build and deploy workflow, not a separate Rayfin provisioning workflow.

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

4d ago Changed · +11 lines · -11 tokens per session 7dbfb00dfcbe
5d ago Changed · -1 lines 959cd9a30bde
10d ago First seen · 45 lines · 57 tokens per session scan A 4f658b219835

Subscribe to this mod's changes

add-backend is a skill published in the GitHub repository microsoft/managed-apps (36 stars, last pushed 3d ago), licensed MIT. It adds 46 tokens to every session and 489 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-29.

Backend and APIs Databases

add-backend next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
add-backendmicrosoft/managed-apps	Skill	36	3d ago	MIT	A	46	Claude Code
event-store-designwshobson/agents	Skill	42k	3d ago	MIT	A	33	Claude Code
platform-custom-field-generateforcedotcom/sf-skills	Skill	1.2k	2d ago	Apache-2.0	A	139	Claude Code
field-service-sobject-create-configureforcedotcom/sf-skills	Skill	1.2k	2d ago	Apache-2.0	A	74	Claude Code
durable-objectsfcakyon/claude-codex-settings	Skill	1.2k	today	Apache-2.0	A	22	Claude Code
nornicdb-grpcorneryd/NornicDB	Skill	924	today	MIT	A	98	Claude Code, Codex
nw-ddd-eventsourcingnWave-ai/nWave	Skill	633	yesterday	MIT	A	38	Claude Code