diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75b80a7..caab051 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,8 +2,14 @@
 
 ## Unreleased
 
+### Bug Fixes
+
+- fix: Honour a boolean option written as a bare YAML `false`, such as `auto-filename: false`, `enabled: false`, or `lines-label: false`. The value was read as an absent option, so the default applied instead and only the quoted string worked.
+
 ### Documentation
 
+- docs: Correct the reference and the examples page, which said a derived filename frames nothing in HTML. It frames the block through the injected script, as the rest of the HTML chrome does.
+
 - docs: Add a documentation website under `docs/`, built on the `atelier` project type and published to <https://m.canouil.dev/quarto-code-window/>, framed by the extension itself.
 - docs: Record that the filter claims code blocks at `pre-quarto`, which prevents `typst-render` from seeing its own `{typst}` blocks and double-decorates alongside `language-cell-decorator`.
 - docs: Trim `README.md` to a landing page pointing at the website.
diff --git a/_extensions/code-window/_modules/metadata.lua b/_extensions/code-window/_modules/metadata.lua
index bab2087..2e1b6d5 100644
--- a/_extensions/code-window/_modules/metadata.lua
+++ b/_extensions/code-window/_modules/metadata.lua
@@ -42,8 +42,12 @@ end
 --- @param key string The metadata key to retrieve
 --- @return string|nil The metadata value as a string, or nil if not found
 --- @usage local repo = M.get_metadata_value(meta, "github", "repository-name")
+--- @note A boolean `false` is a value, not an absence, so the test is against
+---   `nil` rather than truthiness. Stringifying it yields "false", which is what
+---   a caller comparing against the string form already expects.
 function M.get_metadata_value(meta, extension_name, key)
-  if meta['extensions'] and meta['extensions'][extension_name] and meta['extensions'][extension_name][key] then
+  if meta['extensions'] and meta['extensions'][extension_name]
+      and meta['extensions'][extension_name][key] ~= nil then
     return str.stringify(meta['extensions'][extension_name][key])
   end
   return nil
@@ -175,6 +179,44 @@ function M.get_options(spec)
   return result
 end
 
+-- ============================================================================
+-- PROJECT METADATA UTILITIES
+-- ============================================================================
+
+--- Get repo-url from Quarto project metadata via QUARTO_EXECUTE_INFO.
+--- Reads the JSON file pointed to by the QUARTO_EXECUTE_INFO environment variable
+--- and extracts repo-url from website or book metadata.
+--- @return string|nil The repo-url value, or nil if not available
+function M.get_project_repo_url()
+  local path = os.getenv("QUARTO_EXECUTE_INFO")
+  if not path then return nil end
+
+  local file = io.open(path, "r")
+  if not file then return nil end
+
+  local content = file:read("*a")
+  file:close()
+
+  if str.is_empty(content) then return nil end
+
+  local ok, info = pcall(quarto.json.decode, content)
+  if not ok or not info then return nil end
+
+  local format_meta = info["format"] and info["format"]["metadata"]
+  if not format_meta then return nil end
+
+  -- Try website.repo-url first, then book.repo-url
+  local repo_url = nil
+  if format_meta["website"] and format_meta["website"]["repo-url"] then
+    repo_url = format_meta["website"]["repo-url"]
+  elseif format_meta["book"] and format_meta["book"]["repo-url"] then
+    repo_url = format_meta["book"]["repo-url"]
+  end
+
+  if str.is_empty(repo_url) then return nil end
+  return repo_url
+end
+
 -- ============================================================================
 -- MODULE EXPORT
 -- ============================================================================
diff --git a/docs/_quarto.yml b/docs/_quarto.yml
index b586862..6068cbf 100644
--- a/docs/_quarto.yml
+++ b/docs/_quarto.yml
@@ -124,7 +124,4 @@ extensions:
     style: "macos"
     # Blocks here are configuration to copy rather than files to save, so a
     # filename derived from the language would only add noise.
-    #
-    # Quoted deliberately. A bare `false` is read as unset and reverts to the
-    # default, because the option lookup treats a Lua `false` as absent.
-    auto-filename: "false"
+    auto-filename: false
diff --git a/docs/examples.qmd b/docs/examples.qmd
index a6d4afb..06cba1a 100644
--- a/docs/examples.qmd
+++ b/docs/examples.qmd
@@ -11,7 +11,7 @@ The site sets:
 extensions:
   code-window:
     style: macos
-    auto-filename: "false"
+    auto-filename: false
 ```
 
 ## Naming the window
@@ -30,8 +30,8 @@ project:
   type: website
 ```
 
-A block with no `filename` is left alone in HTML, whatever `auto-filename` says.
-Under Typst that same block is framed and labelled with its language.
+A block with no `filename` is left alone here, because this site turns `auto-filename` off.
+With it on, that same block is framed and labelled with its language, in HTML and under Typst alike.
 
 ## The three styles
 
diff --git a/docs/reference.qmd b/docs/reference.qmd
index 4223ee5..1214f61 100644
--- a/docs/reference.qmd
+++ b/docs/reference.qmd
@@ -54,10 +54,11 @@ extensions:
 
 Quarto's own `filename` attribute names the window.
 
-::: {.callout-important}
-In HTML output only a block with an author-set `filename` is framed.
-Quarto builds the wrapper the chrome attaches to before this filter runs, so a filename derived by `auto-filename` arrives too late: the block keeps its language as a `data-filename` attribute and renders without a window.
-Typst is unaffected, and frames derived and author-set filenames alike.
+::: {.callout-note}
+A derived filename is applied later than an author-set one.
+Quarto builds its own wrapper before this filter runs, so a block with no `filename` leaves the filter carrying a `data-filename` attribute and a marker class instead, and the injected script builds the wrapper at page load.
+The result is the same window; it needs JavaScript, as the rest of the HTML chrome does.
+Typst frames derived and author-set filenames alike, without a script.
 :::
 
 ## How the chrome is applied
@@ -104,5 +105,4 @@ Two extensions in this family are affected: [`typst-render`](https://m.canouil.d
 - HTML formats and Typst. Elsewhere the code block is left as it is.
 - Folding is HTML only; Typst has no equivalent.
 - The HTML chrome is built by script at page load, so a reader with JavaScript off sees plain code blocks.
-- `auto-filename` frames nothing in HTML; give a block an explicit `filename` there.
-- A boolean option written as `false` under `extensions.code-window` is read as unset and reverts to its default. Write `"false"` in quotes until this is fixed.
+- A block with a derived filename is framed by the script rather than by the wrapper Quarto builds, so it needs JavaScript in HTML like the rest of the chrome.