diff --git a/AGENTS.md b/AGENTS.md
index 406f6fc..24d2c51 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -250,6 +250,7 @@ render(tmpl, data, partials) → render_nodes (walks flat node array against con
 
 ## Design decisions
 
+You may never, *ever* remove `TODO:` or `FIXME:` comments. Those are for humans, not machines.
 See `HUGO.md` for analysis of why thor doesn't need Hugo's shortcode context isolation.
 See `mustache/PARTIAL_INDENT.md` for whitespace handling analysis.
 See `mustache/SPEC.md` for the original implementation specification.
diff --git a/TODOS.md b/TODOS.md
index 9186c89..8ccc123 100644
--- a/TODOS.md
+++ b/TODOS.md
@@ -1,7 +1,11 @@
+- [ ] Integrity hash
+  - Allows users to verify their output didn't change after upgrading to a new version
 - [ ] Content-hash fingerprinting for CSS and JS cache busting
 - [ ] Clean up the default layouts
 - [ ] Memory
   - [ ] Not sure whether to use temp allocator or site_allocator in opengraph.odin.
+  - [ ] Not sure whether to use temp allocator or site_allocator in `site_load_content`.
+  - [ ] Might not need to allocate in `strip_html_tags`
 - [ ] Performance
   - [ ] See if we can disable bounds checks in `write_indented` and elsewhere.
   - [ ] Instead of loading the site fresh each time in watch mode, create a
@@ -9,16 +13,18 @@
   - [ ] Only publish referenced assets.
   - [ ] Split `load_page` into frontmatter-parse + body-process phases so draft pages can skip the markdown pipeline entirely
   - [ ] Use spall to find ways to reduce run time.
-- [ ] mustache data keys for opengraph, etc.
+- [ ] Open Graph
+  - [x] mustache data keys for opengraph, etc.
+  - [ ] OpenGraph meta tags — verify all fields match production site
+  - [ ] set opengraph tags / description automatically if unset. (Like hugo does)
+  - [ ] can't set avatar.jpg directly in `og_init`.
 - [ ] Author should be a struct adhering to https://schema.org/author
 - [ ] Block attributes on code fences (`{ #ex-1 }`) — hello-world.md
 - [ ] include-code shortcode (`{{< include-code ... >}}`) — i-ported-fd-to-odin
 - [ ] follow symlinks in `scan_content`?
 - [ ] ensure sidenote numbers render in display order and not in declaration order.
-- [ ] OpenGraph meta tags — verify all fields match production site
 - [ ] Add Opt-in deflist support.
 - [ ] We need to be able to do `Year_Section` in a non-magical, unprivileged way. See [PLAN.md](PLAN.md) for computed properties approach.
-- [ ] set opengraph tags / description automatically if unset. (Like hugo does)
 - [ ] Table of contents support.
 - [ ] prefixing every log message with `thor: ` is silly
 - [ ] Nav items should be active when the current page is selected.
diff --git a/content.odin b/content.odin
index df60038..70a3490 100644
--- a/content.odin
+++ b/content.odin
@@ -13,6 +13,7 @@ Page :: struct {
 	slug:        string,
 	layout:      string,
 	permalink:   string,
+	url:         string,
 	title:       string,
 	description: string,
 	date:        string,
@@ -28,6 +29,10 @@ Page :: struct {
 site_load_content :: proc(site: ^Site) {
 	site.pages = make([dynamic]Page, 0, 8, site_allocator(site))
 	scan_content(site, site.content_dir, "")
+
+	for &page in site.pages {
+		page.url = fmt.tprintf("%s%s", site.base_url, page.permalink)
+	}
 }
 
 // scan_content walks the content directory. At the root level (section=""),
diff --git a/feed.odin b/feed.odin
index d17e483..bc22c95 100644
--- a/feed.odin
+++ b/feed.odin
@@ -40,18 +40,16 @@ generate_rss :: proc(site: ^Site) -> string {
 			fmt.aprintf(
 				`<item>
 <title>%s</title>
-<link>%s%s</link>
+<link>%s</link>
 <pubDate>%s</pubDate>
-<guid>%s%s</guid>
+<guid>%s</guid>
 <description>%s</description>
 </item>
 `,
 				xml_escape(page.title),
-				site.base_url,
-				page.permalink,
+				page.url,
 				pub_date,
-				site.base_url,
-				page.permalink,
+				page.url,
 				xml_escape(page.body_html),
 			),
 		)
@@ -78,7 +76,7 @@ generate_sitemap :: proc(site: ^Site) -> string {
 		}
 		strings.write_string(
 			&sb,
-			fmt.aprintf("<url><loc>%s%s</loc>%s</url>\n", site.base_url, page.permalink, lastmod),
+			fmt.aprintf("<url><loc>%s</loc>%s</url>\n", page.url, lastmod),
 		)
 	}
 
diff --git a/opengraph.odin b/opengraph.odin
index 48b207e..dcf0cde 100644
--- a/opengraph.odin
+++ b/opengraph.odin
@@ -28,7 +28,7 @@ og_init :: proc(site: Site) -> Open_Graph {
 og_for_page :: proc(site: Site, page: Page, base: Open_Graph) -> Open_Graph {
 	og := base
 	is_article := page.section != ""
-	og.url = fmt.tprintf("%s%s", site.base_url, page.permalink)
+	og.url = page.url
 	og.title = strip_html_tags(page.title, context.temp_allocator)
 	og.type = "article" if is_article else "website"
 	og.is_article = is_article