feat: skip describe tool when only actions exposed and per_action_tool

[stefanrudi]

We should skip the describe tool when only actions / functions are exposed in the service and the per_action_tool feature flag is set.

[hyperspace-pr-bot]

Summary

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test: Skip describe tool when per_action_tool is enabled and service exposes only actions

Description

This change ensures that the describe tool is skipped when the per_action_tool feature flag is set and the service exposes only actions/functions (no entities). Previously, the describe tool was always registered regardless of whether entities were present, which was unnecessary overhead when only action-specific tools are used.

Changes

• lib/index.js: Added a condition to skip registerDescribeTool when per_action_tool is enabled and no entities are exposed. Also refactored the usePerActionTools check to use a strict boolean comparison (=== true).
• lib/compile.js: Added the same conditional logic to skip adding the describe tool definition during compilation when per-action tools are used and no entities exist.
• tests/bookshop/srv/action-only-service.cds: Added a new CDS service definition (ActionOnlyService) that exposes only an action (myAction) with no entities, used for testing.
• tests/integration/per-action-tools.test.js: Added a test case verifying that the describe, query, and call tools are not listed, while myAction is listed, for the action-only service endpoint.
• CHANGELOG.md: Added a changelog entry for version 1.4.4 documenting this behavior change.

Category

🧪 Test / 🐛 Bug Fix

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PR Bot Information

Version: 1.29.54

• Correlation ID: 5ea9c910-a2e2-11f1-9f05-fa435d5cdc12
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[PDT42]

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