coder · DanielleMaywood · Aug 12, 2026 · Jul 21, 2026 · Aug 10, 2026 · Aug 10, 2026
diff --git a/coderd/apidoc/docs.go b/coderd/apidoc/docs.go
diff --git a/coderd/apidoc/swagger.json b/coderd/apidoc/swagger.json
diff --git a/coderd/database/dbauthz/dbauthz.go b/coderd/database/dbauthz/dbauthz.go
@@ -1889,13 +1889,6 @@ func (q *querier) CalculateAIBridgeInterceptionsTelemetrySummary(ctx context.Con
 	return q.db.CalculateAIBridgeInterceptionsTelemetrySummary(ctx, arg)
 }
 
-func (q *querier) ChatSearchQueryIsEmpty(ctx context.Context, search string) (bool, error) {
-	if err := q.authorizeContext(ctx, policy.ActionRead, rbac.ResourceChat); err != nil {
-		return false, err
-	}
-	return q.db.ChatSearchQueryIsEmpty(ctx, search)
-}
-
 func (q *querier) ClaimPrebuiltWorkspace(ctx context.Context, arg database.ClaimPrebuiltWorkspaceParams) (database.ClaimPrebuiltWorkspaceRow, error) {
 	empty := database.ClaimPrebuiltWorkspaceRow{}
 

diff --git a/coderd/database/dbauthz/dbauthz_test.go b/coderd/database/dbauthz/dbauthz_test.go
@@ -942,10 +942,6 @@ func (s *MethodTestSuite) TestChats() {
 		dbm.EXPECT().BackfillChatMessagesSearchTsv(gomock.Any(), int32(100)).Return(int64(0), nil).AnyTimes()
 		check.Args(int32(100)).Asserts(rbac.ResourceChat, policy.ActionUpdate)
 	}))
-	s.Run("ChatSearchQueryIsEmpty", s.Mocked(func(dbm *dbmock.MockStore, _ *gofakeit.Faker, check *expects) {
-		dbm.EXPECT().ChatSearchQueryIsEmpty(gomock.Any(), "!!!").Return(true, nil).AnyTimes()
-		check.Args("!!!").Asserts(rbac.ResourceChat, policy.ActionRead)
-	}))
 	s.Run("GetChatRetentionDays", s.Mocked(func(dbm *dbmock.MockStore, _ *gofakeit.Faker, check *expects) {
 		dbm.EXPECT().GetChatRetentionDays(gomock.Any()).Return(int32(30), nil).AnyTimes()
 		check.Args().Asserts()

diff --git a/coderd/database/dbmetrics/querymetrics.go b/coderd/database/dbmetrics/querymetrics.go
diff --git a/coderd/database/dbmock/dbmock.go b/coderd/database/dbmock/dbmock.go
diff --git a/coderd/database/querier.go b/coderd/database/querier.go
diff --git a/coderd/database/queries.sql.go b/coderd/database/queries.sql.go
diff --git a/coderd/database/queries/chats.sql b/coderd/database/queries/chats.sql
@@ -339,11 +339,6 @@ SET search_tsv = COALESCE(
     ''::tsvector)
 FROM batch WHERE cm.id = batch.id;
 
--- name: ChatSearchQueryIsEmpty :one
--- Reports whether search text tokenizes to an empty tsquery (e.g. '!!!').
--- Used to reject input that would silently match nothing.
-SELECT numnode(websearch_to_tsquery('simple', @search::text)) = 0 AS is_empty;
-
 -- name: GetChatByID :one
 SELECT *
 FROM chats_expanded

diff --git a/coderd/exp_chats.go b/coderd/exp_chats.go
@@ -357,7 +357,7 @@ func (api *API) chatsByWorkspace(rw http.ResponseWriter, r *http.Request) {
 // @Security CoderSessionToken
 // @Tags Chats
 // @Produce json
-// @Param q query string false "Search query. Supports `title:<substring>` (case-insensitive, quote multi-word values), `archived:bool`, `has_unread:bool`, `pr_status:<draft\|open\|merged\|closed>` as repeated or comma-separated values, `source:<created_by_me\|shared_with_me>`, `diff_url:<url>` (quote values containing colons), `pr:<number>` (exact PR number match), `repo:<owner/repo>` (case-insensitive substring match against git remote origin or URL), `pr_title:<text>` (case-insensitive PR title substring), `search:<text>` (full-text search across chat titles, PR titles, PR numbers, and message bodies; quote multi-word values; cannot be combined with title, pr_title, or pr). Bare terms are not supported; use `title:<value>` or `search:<value>`."
+// @Param q query string false "Search query. Supports `title:<substring>` (case-insensitive, quote multi-word values), `archived:bool`, `has_unread:bool`, `pr_status:<draft\|open\|merged\|closed>` as repeated or comma-separated values, `source:<created_by_me\|shared_with_me>`, `diff_url:<url>` (quote values containing colons), `pr:<number>` (exact PR number match), `repo:<owner/repo>` (case-insensitive substring match against git remote origin or URL), `pr_title:<text>` (case-insensitive PR title substring), `search:<text>` (full-text search across chat titles, PR titles, PR numbers, and message bodies; quote multi-word values; cannot be combined with title, pr_title, or pr; a value that tokenizes to no searchable words returns an empty list). Bare terms are not supported; use `title:<value>` or `search:<value>`."
 // @Param label query string false "Filter by label as key:value. Repeat for multiple (AND logic)."
 // @Success 200 {array} codersdk.Chat
 // @Router /api/experimental/chats [get]
@@ -381,28 +381,6 @@ func (api *API) listChats(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Reject text that tokenizes to nothing; it would silently match no rows.
-	if searchParams.Search != "" {
-		isEmpty, err := api.Database.ChatSearchQueryIsEmpty(ctx, searchParams.Search)
-		if err != nil {
-			httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
-				Message: "Failed to validate search query.",
-				Detail:  err.Error(),
-			})
-			return
-		}
-		if isEmpty {
-			httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
-				Message: "Invalid chat search query.",
-				Validations: []codersdk.ValidationError{{
-					Field:  "search",
-					Detail: "Search query contains no searchable words.",
-				}},
-			})
-			return
-		}
-	}
-
 	var labelFilter pqtype.NullRawMessage
 	if labelParams := r.URL.Query()["label"]; len(labelParams) > 0 {
 		labelMap := make(map[string]string, len(labelParams))

diff --git a/coderd/exp_chats_test.go b/coderd/exp_chats_test.go
@@ -2065,17 +2065,27 @@ func TestListChats_Search(t *testing.T) {
 		require.NotContains(t, ids, noMatch.ID)
 	})
 
-	t.Run("NoSearchableWordsReturns400", func(t *testing.T) {
+	t.Run("NoSearchableWordsReturnsEmpty", func(t *testing.T) {
 		t.Parallel()
-		ctx, client, _, _, _ := setup(t)
+		ctx, client, db, firstUser, modelConfig := setup(t)
 
-		_, err := client.ListChats(ctx, &codersdk.ListChatsOptions{
+		// "or" is a real lexeme (an operator only between operands), so
+		// search:"or" matches the control chat; search:"!!!" has no lexemes and
+		// matches nothing.
+		control := createChat(t, db, firstUser, modelConfig.ID, "fix this or that")
+		backfillSearchTsv(ctx, t, db)
+
+		chats, err := client.ListChats(ctx, &codersdk.ListChatsOptions{
+			Query: `search:"or"`,
+		})
+		require.NoError(t, err)
+		require.Contains(t, chatIDs(chats), control.ID)
+
+		chats, err = client.ListChats(ctx, &codersdk.ListChatsOptions{
 			Query: `search:"!!!"`,
 		})
-		sdkErr := requireSDKError(t, err, http.StatusBadRequest)
-		require.Len(t, sdkErr.Validations, 1)
-		require.Equal(t, "search", sdkErr.Validations[0].Field)
-		require.Contains(t, sdkErr.Validations[0].Detail, "no searchable words")
+		require.NoError(t, err)
+		require.Empty(t, chats)
 	})
 
 	t.Run("ComposesWithRepoFilterAndArchivedDefault", func(t *testing.T) {

diff --git a/coderd/searchquery/search_test.go b/coderd/searchquery/search_test.go
@@ -1265,6 +1265,55 @@ func TestSearchTasks(t *testing.T) {
 	}
 }
 
+func TestSearchChatsFrontendEmitted(t *testing.T) {
+	t.Parallel()
+
+	// These query shapes must match the emitters in
+	// site/src/pages/AgentsPage/components/ChatsSidebar/dialogs/searchQuery.ts
+	// and site/src/api/queries/chats.ts.
+	testCases := []struct {
+		name  string
+		query string
+	}{
+		{name: "SearchSingleWord", query: `search:"fix"`},
+		{name: "SearchMultipleWords", query: `search:"fix auth"`},
+		{name: "SearchColon", query: `search:"fix:lint"`},
+		{name: "SearchURL", query: `search:"http://example.com"`},
+		{name: "SearchUnicode", query: `search:"日本語"`},
+		{name: "SearchOperators", query: `search:"fix race OR deadlock -timeout"`},
+		{name: "SearchPunctuationOnly", query: `search:"!!!"`},
+		{name: "SearchOperatorWord", query: `search:"or"`},
+		{name: "HasUnread", query: "has_unread:true"},
+		{name: "Archived", query: "archived:true"},
+		{name: "PRStatuses", query: "pr_status:open,merged"},
+		{name: "DiffURL", query: `diff_url:"https://github.com/coder/coder/pull/1"`},
+		{name: "FilterAndSearch", query: `has_unread:true search:"fix auth"`},
+		{name: "SidebarDefault", query: "archived:false"},
+		{name: "SidebarUnread", query: "archived:false has_unread:true"},
+		{
+			name:  "SidebarFiltered",
+			query: "archived:false pr_status:draft,closed source:created_by_me,shared_with_me",
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			t.Parallel()
+			_, errs := searchquery.Chats(testCase.query)
+			require.Empty(t, errs)
+		})
+	}
+
+	rejectedQueries := []string{"pr_status:banana", "has_unread:maybe"}
+	for _, query := range rejectedQueries {
+		t.Run("Rejects"+query, func(t *testing.T) {
+			t.Parallel()
+			_, errs := searchquery.Chats(query)
+			require.NotEmpty(t, errs)
+		})
+	}
+}
+
 func TestSearchChats(t *testing.T) {
 	t.Parallel()