Document prompt composition Preview

[PROFeNoM]

Purpose

Add the missing customer-facing prompt composition guide to Prompt Management, including a Preview banner directing customers to Datadog Support or their Customer Success Manager. No internal rollout flag names are exposed.

Coverage

• Short UI walkthrough for reusing a shared policy.
• Before/after text-inclusion example; exact-version behavior and Used By.
• API details linked to the API reference instead of repeated in the walkthrough.
• Preview access notice and a Playground screenshot of the composed prompt.

Related implementation

Backend: ddoghq/dd-source#81316 → ddoghq/dd-source#83131 → ddoghq/dd-source#84162.
API contract: DataDog/datadog-api-spec#6670. UI: ddoghq/web-ui#11406. Publish after the implementation is available to Preview customers.

Validation / publication checklist

• The inline text example expands to the documented result; API request details remain in the API reference.
• Documentation team review and CI Vale/Hugo preview. Local Vale and Hugo are unavailable; no rendered-page verification is claimed.
• Control labels checked against the current UI source.
• Add and visually inspect the supplied publication-safe Playground screenshot.
• Verify the full walkthrough in the rendered docs.
• Confirm Preview access-request process with the release owner.

This is a draft. It does not depend on the separate placeholders or configuration documentation PRs, which also edit this page.

AI assistance

Codex assisted with drafting and checking the guide against the implementation and API contract.

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/alex/prompt-composition-docs/llm_observability/configure/prompt_management