carvel-dev/ytt

Health v2 · maintenance only

Adoption not part of the score

1874 stars · 167 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

ytt is a command-line YAML templating and patching tool that operates on YAML structure rather than text, using annotations and a sandboxed Starlark language. It supports data values, reusable templates, and overlays for customizing configuration like Kubernetes manifests, Concourse pipelines, and Docker Compose files.

Use cases

• template kubernetes manifests with environment-specific values
• patch third-party yaml files with overlays
• avoid yaml quoting and indentation issues in templating
• externalize configuration values from yaml files
• generate docker compose or github actions workflow files from templates
• modularize large piles of yaml configuration

When to choose

• you need structure-aware yaml templating instead of text substitution
• you manage complex kubernetes configuration across multiple environments
• you want deterministic, sandboxed template execution
• you need to patch yaml you don't own without editing it directly

When to avoid

• you only need simple key-value substitution in non-YAML files
• your team prefers plain helm or kustomize workflows
• you need a general-purpose text templating engine like jinja

Facets

cli-tool · maturity active

templating configuration-management cli developer-tools developer-tools infrastructure-as-code cli windows go yaml kubernetes starlark overlays carvel configuration-as-code devops automation linux macos

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