From 6e6f8afb1cdb1cf94e262037b7a3b22ac96c8c88 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 20 Feb 2026 19:39:57 +0000
Subject: [PATCH 1/2] Initial plan


From b5b85fee0434b6b83da87f0f14df89f4be02d186 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 20 Feb 2026 19:49:31 +0000
Subject: [PATCH 2/2] Sanitize no-break whitespace (U+00A0) in frontmatter
 before YAML parsing

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
---
 pkg/parser/frontmatter_content.go         | 3 +++
 pkg/parser/frontmatter_extraction_test.go | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/pkg/parser/frontmatter_content.go b/pkg/parser/frontmatter_content.go
index e736ac1b83f..203ad073c65 100644
--- a/pkg/parser/frontmatter_content.go
+++ b/pkg/parser/frontmatter_content.go
@@ -55,6 +55,9 @@ func ExtractFrontmatterFromContent(content string) (*FrontmatterResult, error) {
 	frontmatterLines := lines[1:endIndex]
 	frontmatterYAML := strings.Join(frontmatterLines, "\n")
 
+	// Sanitize no-break whitespace characters (U+00A0) which break the YAML parser
+	frontmatterYAML = strings.ReplaceAll(frontmatterYAML, "\u00A0", " ")
+
 	// Parse YAML
 	var frontmatter map[string]any
 	if err := yaml.Unmarshal([]byte(frontmatterYAML), &frontmatter); err != nil {
diff --git a/pkg/parser/frontmatter_extraction_test.go b/pkg/parser/frontmatter_extraction_test.go
index 10a9b69e3a2..77e342e510d 100644
--- a/pkg/parser/frontmatter_extraction_test.go
+++ b/pkg/parser/frontmatter_extraction_test.go
@@ -55,6 +55,15 @@ This is a test workflow with empty frontmatter.`,
 			content: "---\ntitle: Test\nno closing delimiter",
 			wantErr: true,
 		},
+		{
+			name:    "no-break whitespace in values",
+			content: "---\ntitle:\u00A0Test\u00A0Workflow\nengine:\u00A0copilot\n---\n\n# Content",
+			wantYAML: map[string]any{
+				"title":  "Test Workflow",
+				"engine": "copilot",
+			},
+			wantMarkdown: "# Content",
+		},
 	}
 
 	for _, tt := range tests {