diff --git a/config.toml b/config.toml
index b1912d0..4e28c7a 100644
--- a/config.toml
+++ b/config.toml
@@ -13,7 +13,7 @@ images = ["img/scverse-social-card.png"]
 description = "Foundational tools for omics data in the life sciences"
 
 [outputs]
-home = ["html", "rss", "entities"]
+home = ["html", "rss", "entities", "llms"]
 
 [outputFormats.entities]
 mediaType = "application/json"
@@ -24,6 +24,11 @@ notAlternative = true
 [markup.goldmark.renderer]
 unsafe= true
 
+[outputFormats.llms]
+mediaType = "text/plain"
+baseName = "llms"
+isPlainText = true
+
 # The ecosystem registry rebuilds this site when packages.json changes, so a cached copy defeats the trigger.
 # Hugo caches remote resources forever by default, and on Netlify that cache survives between builds.
 [caches.getresource]
diff --git a/layouts/index.llms.txt b/layouts/index.llms.txt
new file mode 100644
index 0000000..e906bec
--- /dev/null
+++ b/layouts/index.llms.txt
@@ -0,0 +1,62 @@
+# scverse
+
+> scverse is a consortium of foundational, interoperable open-source tools (mostly Python) for single-cell and spatial omics data analysis in the life sciences.
+
+scverse packages share common data structures (AnnData, MuData, SpatialData) to guarantee interoperability across the ecosystem.
+Most package documentation lives on dedicated external sites, linked below.
+This site (scverse.org) hosts the package index, tutorials, project governance, events, and the blog.
+
+## Core packages
+
+Foundational packages maintained by the scverse core team.
+{{- $registryBase := "https://scverse.org/ecosystem-packages/" }}
+{{- $pkgs := transform.Unmarshal (resources.GetRemote (printf "%spackages.json" $registryBase)).Content }}
+{{- $core := slice }}
+{{- $org := slice }}
+{{- range $pkgs }}
+  {{- $entry := merge . (dict "sortkey" (lower .name)) }}
+  {{- if in (slice "core-datastructure" "core-framework") .category }}
+    {{- $core = $core | append $entry }}
+  {{- else if and (in (.project_home | default "") "github.com/scverse/") (ne .category "core-infrastructure") }}
+    {{- /* core-infrastructure is the scverse repos themselves, not packages. */}}
+    {{- $org = $org | append $entry }}
+  {{- end }}
+{{- end }}
+{{ range sort $core "sortkey" }}
+{{- /* Registry descriptions carry markdown and hard line breaks; llms.txt wants one line each. */}}
+{{- $desc := trim (.description | markdownify | plainify | htmlUnescape | replaceRE `\s+` " ") " " }}
+- [{{ .name }}]({{ .documentation_home | default .project_home }}): {{ $desc }}
+{{- end }}
+
+## More packages
+
+Other packages maintained in the scverse GitHub organization. The full index, including
+community packages built on scverse standards, is at {{ absURL "packages/" }}.
+{{ range sort $org "sortkey" }}
+{{- $desc := trim (.description | markdownify | plainify | htmlUnescape | replaceRE `\s+` " ") " " }}
+- [{{ .name }}]({{ .documentation_home | default .project_home }}): {{ $desc }}
+{{- end }}
+
+## Learn
+- [Tutorials]({{ absURL "learn/" }}): Getting-started tutorials for the core packages.
+- [Package index]({{ absURL "packages/" }}): All core and ecosystem packages with links to docs, source, and distribution.
+- [Single-cell best practices](https://www.sc-best-practices.org/): Community book on best practices for single-cell analysis.
+
+## About
+- [Mission]({{ absURL "about/mission/" }}): What scverse is and why it exists.
+- [Roles and governance]({{ absURL "about/roles/" }}): Core team, steering council, and how the project is run.
+- [Code of conduct]({{ absURL "about/code_of_conduct/" }}): Community standards for participation.
+- [AI policy]({{ absURL "about/ai_policy/" }}): Expectations for contributing AI-assisted code to scverse projects.
+
+## Community
+- [GitHub](https://github.com/scverse): Source code for all scverse packages.
+- [Discourse](https://discourse.scverse.org/): User forum for questions and discussion.
+- [Zulip](https://scverse.zulipchat.com/): Developer chat.
+- [Ecosystem packages](https://github.com/scverse/ecosystem-packages): Community packages built on scverse standards, and inclusion criteria.
+- [cookiecutter-scverse](https://cookiecutter-scverse-instance.readthedocs.io/en/latest/): Project template for creating new scverse-compatible packages.
+
+## Optional
+- [Blog]({{ absURL "blog/" }}): Announcements and release notes.
+- [Events]({{ absURL "events/" }}): Conferences and hackathons.
+- [People]({{ absURL "people/" }}): Contributors and core team.
+- [YouTube](https://www.youtube.com/channel/UCpsvsIAW3R5OdftJKKuLNMA): Recorded talks and workshops.