Build on CAP, Java — onedevatlas

Build on CAP

Before you build, check what is there. If you find something close, think about contributing to it. If you find nothing, start building.

Guidance, not rules. Each project's own contributing guide wins. Links read 2026-09-29

All CAP Node.js Java

01Check what is there

Search by the use case, not by a package name: the same need often sits under a capability you would not guess. The capability map and Browse hold everything in CAP.

What gets built on CAP

CDS plugins 1 What it is

Packages 40 What it is

Build tools 3 What it is

Generators 7 What it is

CLI tools 16 What it is

MCP servers 3 What it is

02Found something? Contribute

Where an artifact does most of what you need, a fix, a test or a page of documentation reaches everyone who already uses it. Read where it stops and its open and closed issues first: someone may have asked already. Then contribute to a project. These are the places where evidence or a second hand counts most.

Not known yet

Access an external system through an application MCP service
Not known yet for cap-mcp-bridge, 1 of 3 artifacts cover it
Keep version history for an attached document
Not known yet for com.sap.cds:cds-feature-attachments, 1 of 3 artifacts cover it
Receive messages from an Apache Kafka topic
Not known yet for com.sap.cds:cds-feature-kafka, 3 of 4 artifacts cover it
Serve a UI5 CLI project from the CAP server while developing
Not known yet for @sap/cds, 2 of 3 artifacts cover it
Upload an attachment from a client that is not SAP Fiori elements
Not known yet for com.sap.cds:cds-feature-attachments, 1 of 2 artifacts cover it

One artifact stands

03Nothing there? Build

Use cases no recorded artifact covers, and capabilities with no artifact in CAP. Unmapped means the atlas holds nothing, not that nothing exists: search once more, then build a plugin.

Use cases nothing covers

Cut the tokens a CAP service spends sending its data to a model
No artifact recorded, under LLM integration
Give the agent a chat screen in the application
No artifact recorded, under Agent tooling
Keep a conversation after the server restarts
None of 1 recorded artifacts covers it, under Agent tooling
Recall a user's preference in a later conversation
No artifact recorded, under Agent tooling
Require a person's approval before the agent acts
None of 1 recorded artifacts covers it, under Agent tooling
Stream a model's answer out of a CAP service
No artifact recorded, under LLM integration

Capabilities with no artifact

NextContribute to a project