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124 changes: 106 additions & 18 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,7 +1,16 @@
# @cap-js/mcp-server
# Welcome to @cap-js/mcp-server

[![REUSE status](https://api.reuse.software/badge/github.com/cap-js/mcp-server)](https://api.reuse.software/info/github.com/cap-js/mcp-server)



> [!NOTE]
> This project is in alpha state. Don't use it for production code.



## About This Project

A Model Context Protocol (MCP) server for the [SAP Cloud Application Programming Model (CAP)](https://cap.cloud.sap).
Use it for AI-assisted development of CAP applications (_agentic coding_).

Expand All @@ -12,11 +21,50 @@ The server helps AI models answer questions like:
- _How do they relate?_
- _How do I add columns to a select statement in CAP Node.js?_

> [!NOTE]
> This project is in alpha state. Don't use it for production code.


## Table of Contents

- [About This Project](#about-this-project)
- [Requirements](#requirements)
- [Setup](#setup)
- [Available Tools](#available-tools)
- [`search_model`](#search_model)
- [`search_docs`](#search_docs)
- [Usage](#usage)
- [Usage in VS Code](#usage-in-vs-code)
- [Usage in opencode](#usage-in-opencode)
- [Usage in CLI](#usage-in-cli)
- [How It Works](#how-it-works)
- [Support, Feedback, Contributing](#support-feedback-contributing)
- [Security / Disclosure](#security--disclosure)
- [Code of Conduct](#code-of-conduct)
- [Licensing](#licensing)
- [Acknowledgments](#acknowledgments)



## Requirements

See [Getting Started](https://cap.cloud.sap/docs/get-started) on how to jumpstart your development and grow as you go with SAP Cloud Application Programming Model.



## Setup

```sh
npm i -g @cap-js/mcp-server
```

This will provide the command `cds-mcp` to start the CAP MCP server.



## Available Tools

> [!NOTE]
> Tools are meant to be used by AI models and do not constitute a stable API.

The server provides these tools for CAP development:

### `search_model`
Expand All @@ -35,19 +83,52 @@ Search [CAP documentation](https://cap.cloud.sap) for:
- Code snippets and examples
- API usage patterns

## Setup

```sh
npm i -g @cap-js/mcp-server

## Usage

Configure your MCP client (Cline, opencode, Claude Code, etc.) to start the server with command `cds-mcp`.

The following rules help guide the LLM to use the server correctly:

```markdown
- You MUST search for CDS definitions, like entities, fields and services (which include HTTP endpoints) with cds-mcp, only if it fails you MAY read \*.cds files in the project.
- You MUST search for CAP docs with cds-mcp EVERY TIME you modify CDS models or when using APIs from CAP. Do NOT propose, suggest or make any changes without first checking it.
```

This will provide the command `cds-mcp` to start the CAP MCP server.
### Usage in VS Code

## Usage
<!--
To **register the server** (once), follow these steps:
1. Run command `MCP: Add Server...`
1. Select `Command`
1. Set `cds-mcp` as the command
1. Provide `@cap-js/mcp-server` as the Server ID
1. Choose to install globally

**In an application project**, open the _Chat_ panel.
Select the server through the _Select tools_ button.
-->

TODO:

```json
{
"mcpServers": {
"cds-mcp": {
"command": "cds-mcp",
"args": [],
"env": {}
}
}
}
```json

See the [VS Code docs](https://code.visualstudio.com/docs/copilot/chat/mcp-servers) for more details.

Configure your MCP client (Claude Code, opencode, and so on) to start the server with command `cds-mcp`.
### Usage in opencode

Example for opencode:
Example for [opencode](https://github.com/sst/opencode):

```json
{
Expand All @@ -61,16 +142,11 @@ Example for opencode:
}
```

The following rules help guide the LLM to use the server correctly:
Don't forget to add the rules to `~/.config/opencode/AGENTS.md`, or in your project-specific `AGENTS.md` file.

```markdown
- You MUST search for CDS definitions, like entities, fields and services (which include HTTP endpoints) with cds-mcp, only if it fails you MAY read \*.cds files in the project.
- You MUST search for CAP docs with cds-mcp EVERY TIME you modify CDS models or when using APIs from CAP. Do NOT propose, suggest or make any changes without first checking it.
```
### Usage in CLI

### CLI Usage

You can also use the tools directly from the command line:
For experimental purposes, you can also use the tools directly from the command line:

```sh
# Search for CDS model definitions
Expand All @@ -80,6 +156,8 @@ cds-mcp search_model . Books entity
cds-mcp search_docs "how to add columns to a select statement in CAP Node.js" 1
```



## How It Works

The server provides two complementary search mechanisms optimized for different use cases:
Expand All @@ -105,22 +183,32 @@ This tool uses vector embeddings to search through preprocessed CAP documentatio

This approach enables semantic search - you can find relevant documentation even when your query doesn't contain exact keywords from the docs.



## Support, Feedback, Contributing

This project is open to feature requests/suggestions, bug reports, and so on, via [GitHub issues](https://github.com/cap-js/mcp-server/issues). Contribution and feedback are encouraged and always welcome. For more information about how to contribute, the project structure, as well as additional contribution information, see our [Contribution Guidelines](CONTRIBUTING.md).



## Security / Disclosure

If you find any bug that may be a security problem, please follow our instructions at [in our security policy](https://github.com/cap-js/mcp-server/security/policy) on how to report it. Please don't create GitHub issues for security-related doubts or problems.



## Code of Conduct

We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone. By participating in this project, you agree to abide by its [Code of Conduct](https://github.com/cap-js/.github/blob/main/CODE_OF_CONDUCT.md) at all times.



## Licensing

Copyright 2025 SAP SE or an SAP affiliate company and @cap-js/cds-mcp contributors. Please see our [LICENSE](LICENSE) for copyright and license information. Detailed information including third-party components and their licensing/copyright information is available [via the REUSE tool](https://api.reuse.software/info/github.com/cap-js/mcp-server).



## Acknowledgments

- **onnxruntime-web** is used for creating embeddings in Node.js.
Expand Down