diff --git a/work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/artifacts/.gitkeep b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/artifacts/.gitkeep
similarity index 100%
rename from work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/artifacts/.gitkeep
rename to work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/artifacts/.gitkeep
diff --git a/work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/item.md b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/item.md
similarity index 89%
rename from work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/item.md
rename to work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/item.md
index a7e49934..26801310 100644
--- a/work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/item.md
+++ b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/item.md
@@ -2,12 +2,12 @@
 id: 20260527-201313-openai-responses-unhandled-sse-observability
 slug: openai-responses-unhandled-sse-observability
 title: OpenAI Responses 未対応 SSE event を破棄せず観測する
-status: open
+status: closed
 kind: feature
 priority: P1
 labels: [llm, openai, observability, trace]
 created_at: 2026-05-27T20:13:13Z
-updated_at: 2026-05-27T20:13:30Z
+updated_at: 2026-05-27T20:44:19Z
 assignee: null
 legacy_ticket: null
 ---
diff --git a/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/resolution.md b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/resolution.md
new file mode 100644
index 00000000..26801310
--- /dev/null
+++ b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/resolution.md
@@ -0,0 +1,21 @@
+---
+id: 20260527-201313-openai-responses-unhandled-sse-observability
+slug: openai-responses-unhandled-sse-observability
+title: OpenAI Responses 未対応 SSE event を破棄せず観測する
+status: closed
+kind: feature
+priority: P1
+labels: [llm, openai, observability, trace]
+created_at: 2026-05-27T20:13:13Z
+updated_at: 2026-05-27T20:44:19Z
+assignee: null
+legacy_ticket: null
+---
+
+## Background
+
+Created by tickets.sh.
+
+## Acceptance criteria
+
+- TBD
diff --git a/work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/thread.md b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/thread.md
similarity index 84%
rename from work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/thread.md
rename to work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/thread.md
index 22720d07..c3420811 100644
--- a/work-items/open/20260527-201313-openai-responses-unhandled-sse-observability/thread.md
+++ b/work-items/closed/20260527-201313-openai-responses-unhandled-sse-observability/thread.md
@@ -63,4 +63,33 @@ Avoid plumbing raw SSE into session history. This is observability only.
 - Raw SSE frame permanent audit log separate from trace.
 
 
+---
+
+<!-- event: close author: hare at: 2026-05-27T20:44:19Z status: closed -->
+
+## Closed
+
+---
+id: 20260527-201313-openai-responses-unhandled-sse-observability
+slug: openai-responses-unhandled-sse-observability
+title: OpenAI Responses 未対応 SSE event を破棄せず観測する
+status: closed
+kind: feature
+priority: P1
+labels: [llm, openai, observability, trace]
+created_at: 2026-05-27T20:13:13Z
+updated_at: 2026-05-27T20:44:19Z
+assignee: null
+legacy_ticket: null
+---
+
+## Background
+
+Created by tickets.sh.
+
+## Acceptance criteria
+
+- TBD
+
+
 ---