diff --git a/pkg/github/pullrequests.go b/pkg/github/pullrequests.go
index 5cee8b3231..4e24e14021 100644
--- a/pkg/github/pullrequests.go
+++ b/pkg/github/pullrequests.go
@@ -2180,9 +2180,14 @@ func ResolveReviewThreadWithReason(ctx context.Context, client *githubv4.Client,
 			} `graphql:"resolveReviewThread(input: $input)"`
 		}
 
-		input := ResolveReviewThreadInput{
-			ThreadID:         githubv4.ID(threadID),
-			ResolutionReason: newGQLStringlikePtr[githubv4.String](resolutionReason),
+		var input any
+		if resolutionReason == nil {
+			input = githubv4.ResolveReviewThreadInput{ThreadID: githubv4.ID(threadID)}
+		} else {
+			input = ResolveReviewThreadInput{
+				ThreadID:         githubv4.ID(threadID),
+				ResolutionReason: newGQLStringlikePtr[githubv4.String](resolutionReason),
+			}
 		}
 
 		if err := client.Mutate(ctx, &mutation, input, nil); err != nil {
diff --git a/pkg/github/pullrequests_test.go b/pkg/github/pullrequests_test.go
index c0e392aea6..6c52dd2758 100644
--- a/pkg/github/pullrequests_test.go
+++ b/pkg/github/pullrequests_test.go
@@ -1,8 +1,10 @@
 package github
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
+	"io"
 	"net/http"
 	"strings"
 	"sync/atomic"
@@ -19,6 +21,31 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+type captureGraphQLTransport struct {
+	response  string
+	variables map[string]any
+}
+
+func (t *captureGraphQLTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	body, err := io.ReadAll(req.Body)
+	if err != nil {
+		return nil, err
+	}
+	var request struct {
+		Variables map[string]any `json:"variables"`
+	}
+	if err := json.Unmarshal(body, &request); err != nil {
+		return nil, err
+	}
+	t.variables = request.Variables
+	return &http.Response{
+		StatusCode: http.StatusOK,
+		Header:     make(http.Header),
+		Body:       io.NopCloser(bytes.NewBufferString(t.response)),
+		Request:    req,
+	}, nil
+}
+
 func Test_GetPullRequest(t *testing.T) {
 	// Verify tool definition once
 	serverTool := PullRequestRead(translations.NullTranslationHelper)
@@ -4877,3 +4904,19 @@ func TestResolveReviewThread(t *testing.T) {
 		})
 	}
 }
+
+func TestResolveReviewThreadWithoutReasonOmitsOptionalInputField(t *testing.T) {
+	transport := &captureGraphQLTransport{
+		response: `{"data":{"resolveReviewThread":{"thread":{"id":"PRRT_test","isResolved":true}}}}`,
+	}
+	client := githubv4.NewClient(&http.Client{Transport: transport})
+
+	result, err := ResolveReviewThread(context.Background(), client, "PRRT_test", true)
+	require.NoError(t, err)
+	require.False(t, result.IsError)
+	require.NotNil(t, transport.variables)
+	input, ok := transport.variables["input"].(map[string]any)
+	require.True(t, ok)
+	assert.Equal(t, "PRRT_test", input["threadId"])
+	assert.NotContains(t, input, "resolutionReason")
+}
diff --git a/pkg/http/oauth/oauth_test.go b/pkg/http/oauth/oauth_test.go
index c2ef660104..515a0a471f 100644
--- a/pkg/http/oauth/oauth_test.go
+++ b/pkg/http/oauth/oauth_test.go
@@ -436,7 +436,7 @@ func TestHandleProtectedResource(t *testing.T) {
 			host:               "api.example.com",
 			method:             http.MethodGet,
 			expectedStatusCode: http.StatusOK,
-expectedScopes: []string{
+			expectedScopes: []string{
 				"repo",
 				"read:org",
 				"read:user",