feat(issue): add assigned_by filter to list_issues

Add an optional assigned_by parameter to the list_issues tool that maps to
gitea_sdk.ListIssueOption.AssignedBy, and include assignees in the slim
list_issues output for consistency with the single-issue view.

Co-Authored-By: Codet <codet@commitgo.dev> (GPT-5-Codex)

operation/issue/issue.go

@@ -49,6 +49,7 @@ var (
 		tool.Array("milestones", tool.Description("milestone name or ID filter"), tool.Items(map[string]any{"type": "string"})),
 		tool.String("since", tool.Description("updated after ISO 8601")),
 		tool.String("before", tool.Description("updated before ISO 8601")),
+		tool.String("assigned_by", tool.Description("filter by the user who assigned the issue")),
 		tool.Number("page", tool.Description(params.PageDesc), tool.Default(1)),
 		tool.Number("per_page", tool.Description(params.PaginationDesc), tool.Default(30)),
 	)
@@ -204,6 +205,9 @@ func listRepoIssuesFn(ctx context.Context, args map[string]any) (*mcp.CallToolRe
 	if t := params.GetOptionalTime(args, "before"); t != nil {
 		opt.Before = *t
 	}
+	if assignedBy, ok := args["assigned_by"].(string); ok {
+		opt.AssignedBy = assignedBy
+	}
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
 		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))

operation/issue/issue_test.go

@@ -67,6 +67,7 @@ func Test_listRepoIssuesFn_filters(t *testing.T) {
 		"labels":      []any{"bug", "enhancement"},
 		"milestones":  []any{"v1.0", "2"},
 		"since":       "2026-01-01T00:00:00Z",
+		"assigned_by": "octocat",
 	}
 
 	_, err := listRepoIssuesFn(context.Background(), args)
@@ -89,6 +90,9 @@ func Test_listRepoIssuesFn_filters(t *testing.T) {
 	if !strings.Contains(gotQuery, "type=issues") {
 		t.Fatalf("expected type query param, got %s", gotQuery)
 	}
+	if !strings.Contains(gotQuery, "assigned_by=octocat") {
+		t.Fatalf("expected assigned_by query param, got %s", gotQuery)
+	}
 }
 
 func Test_listRepoIssuesFn_includesMilestone(t *testing.T) {
@@ -138,6 +142,52 @@ func Test_listRepoIssuesFn_includesMilestone(t *testing.T) {
 	}
 }
 
+func Test_listRepoIssuesFn_includesAssignees(t *testing.T) {
+	const (
+		owner = "octo"
+		repo  = "demo"
+	)
+
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/api/v1/version":
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"version":"1.12.0"}`))
+		case fmt.Sprintf("/api/v1/repos/%s/%s", owner, repo):
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"private":false}`))
+		case fmt.Sprintf("/api/v1/repos/%s/%s/issues", owner, repo):
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`[
+				{"number": 1, "title": "with assignees", "state": "open", "assignees": [{"login": "octocat"}]}
+			]`))
+		default:
+			http.NotFound(w, r)
+		}
+	})
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	origHost, origToken, origVersion := flag.Host, flag.Token, flag.Version
+	flag.Host, flag.Token, flag.Version = server.URL, "", "test"
+	defer func() { flag.Host, flag.Token, flag.Version = origHost, origToken, origVersion }()
+
+	args := map[string]any{
+		"owner": owner, "repo": repo,
+	}
+	res, err := listRepoIssuesFn(context.Background(), args)
+	if err != nil {
+		t.Fatalf("listRepoIssuesFn() error = %v", err)
+	}
+	if res.IsError {
+		t.Fatalf("unexpected error result: %v", res.Content)
+	}
+	body := res.Content[0].(*mcp.TextContent).Text
+	if !strings.Contains(body, `"assignees"`) || !strings.Contains(body, `"octocat"`) {
+		t.Fatalf("expected assignees in list output, got: %s", body)
+	}
+}
+
 func Test_createIssueFn_labels(t *testing.T) {
 	const (
 		owner = "octo"

operation/issue/slim.go

@@ -63,6 +63,9 @@ func slimIssues(issues []*gitea_sdk.Issue) []map[string]any {
 		if len(i.Labels) > 0 {
 			m["labels"] = slim.LabelNames(i.Labels)
 		}
+		if len(i.Assignees) > 0 {
+			m["assignees"] = slim.UserLogins(i.Assignees)
+		}
 		if i.Milestone != nil {
 			m["milestone"] = map[string]any{
 				"id":    i.Milestone.ID,