Content
# About this project
This is a protocol adapter for the MCP protocol to expose CAP services for agent consumption. For more information, check the official [documentation](https://cap.cloud.sap/docs/guides/protocols/mcp).
## Requirements and Setup
We use the @capire/bookshop as a running sample hereinafter. Clone it and open it in VSCode as follows:
```bash
git clone https://github.com/capire/bookshop
code bookshop
```
## Feature Flags
All configuration lives under `cds.mcp` in your `package.json`:
```json
{
"cds": {
"mcp": {
"per_action_tool": false,
"toon_format": true
}
}
}
```
| Flag | Default | Description |
| ----------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `per_action_tool` | `false` | Expose each action/function as its own dedicated tool instead of the generic `call_action` tool. |
| `toon_format` | `true` | Return query results in [TOON](https://www.npmjs.com/package/@toon-format/toon) format. Set to `false` to use JSON instead. |
| `prefix` | `false` | Prefix tool names with the slugified service name to avoid collisions when a MCP client connects to multiple MCP servers (e.g. `catalog_query`, `admin_describe`). |
For all other configuration options, refer to the official [documentation](https://cap.cloud.sap/docs/guides/protocols/mcp).
## Custom Server Instructions
You can customize the MCP server instructions sent to agents during initialization using the `@mcp.instructions` annotation:
```cds
annotate MyService with @mcp.instructions: 'Use describe to explore the product catalog. Use query to search products by name or category.';
```
If not set, a default instruction is used. The annotation also supports i18n references (`{i18n>key}`).
## Support, Feedback, Contributing
This project is open to feature requests/suggestions, bug reports etc. via [GitHub issues](https://github.com/cap-js/mcp/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 the instructions found [in our security policy](https://github.com/cap-js/mcp/security/policy) on how to report it. Please do not 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 2026 SAP SE or an SAP affiliate company and cap-js/mcp contributors. Please see our [LICENSE](./LICENSES/Apache-2.0.txt) 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).
