fix(backend/copilot): drop encrypted_content from web_search snippet

Anthropic's web_search_result ships an opaque encrypted_content blob
meant for citation round-tripping, not display.  Using it as the
snippet surfaced base64 gibberish to the frontend and to the LLM.
There is no plain-text snippet field in the current beta; drop it
and rely on the model's text blocks with citations for prose.

autogpt_platform/backend/backend/copilot/tools/web_search.py

@@ -183,13 +183,20 @@ def _extract_results(resp: Any, *, limit: int) -> tuple[list[WebSearchResult], i
                     continue
                 if len(results) >= limit:
                     break
+                # Anthropic's ``web_search_result`` exposes only
+                # ``title``/``url``/``page_age`` plus an opaque
+                # ``encrypted_content`` blob that is meant for citation
+                # round-tripping, not for display — it is base64-ish
+                # binary and would show as gibberish if surfaced to the
+                # model or the frontend.  There is no plain-text snippet
+                # field in the current beta; callers get the readable
+                # text via the model's ``text`` blocks with citations,
+                # not via this list.  Leave ``snippet`` empty.
                 results.append(
                     WebSearchResult(
                         title=getattr(item, "title", "") or "",
                         url=getattr(item, "url", "") or "",
-                        snippet=getattr(item, "encrypted_content", None)
-                        or getattr(item, "page_content", "")
-                        or "",
+                        snippet="",
                         page_age=getattr(item, "page_age", None),
                     )
                 )

autogpt_platform/backend/backend/copilot/tools/web_search_test.py

@@ -64,13 +64,17 @@ class TestExtractResults:
     """The extractor is the only Anthropic-response-shape contact point;
     pin its behaviour so an API shape change surfaces here first."""
 
-    def test_extracts_title_url_snippet_and_page_age(self):
+    def test_extracts_title_url_page_age_and_drops_encrypted_snippet(self):
+        # Anthropic's ``web_search_result`` ships an opaque
+        # ``encrypted_content`` blob that is not safe to surface —
+        # the extractor must drop it (snippet=="") regardless of
+        # whether the blob is non-empty.
         resp = _fake_anthropic_response(
             results=[
                 {
                     "title": "Kimi K2.6 launch",
                     "url": "https://example.com/kimi",
-                    "snippet": "Moonshot released K2.6 on 2026-04-20.",
+                    "snippet": "EiJjbGF1ZGUtZW5jcnlwdGVkLWJsb2I=",
                     "page_age": "1 day",
                 },
                 {
@@ -85,7 +89,7 @@ class TestExtractResults:
         assert len(out) == 2
         assert out[0].title == "Kimi K2.6 launch"
         assert out[0].url == "https://example.com/kimi"
-        assert out[0].snippet.startswith("Moonshot released")
+        assert out[0].snippet == ""
         assert out[0].page_age == "1 day"
         assert out[1].snippet == ""