diff --git a/web_src/js/components/RepoActionView.test.ts b/web_src/js/components/RepoActionView.test.ts
new file mode 100644
index 0000000000..d7b9a7de2a
--- /dev/null
+++ b/web_src/js/components/RepoActionView.test.ts
@@ -0,0 +1,22 @@
+import {shouldHideLine, type LogLine} from './RepoActionView.vue';
+
+test('shouldHideLine', () => {
+  expect(([
+    {index: 1, message: 'Starting build process', timestamp: 1000},
+    {index: 2, message: '::add-matcher::/home/runner/go/pkg/mod/example.com/tool/matcher.json', timestamp: 1001},
+    {index: 3, message: 'Running tests...', timestamp: 1002},
+    {index: 4, message: '##[add-matcher]/opt/hostedtoolcache/go/1.25.7/x64/matchers.json', timestamp: 1003},
+    {index: 5, message: 'Test suite started', timestamp: 1004},
+    {index: 7, message: 'All tests passed', timestamp: 1006},
+    {index: 8, message: '::remove-matcher owner=go::', timestamp: 1007},
+    {index: 9, message: 'Build complete', timestamp: 1008},
+  ] as Array<LogLine>).filter((line) => !shouldHideLine(line)).map((line) => line.message)).toMatchInlineSnapshot(`
+    [
+      "Starting build process",
+      "Running tests...",
+      "Test suite started",
+      "All tests passed",
+      "Build complete",
+    ]
+  `);
+});
diff --git a/web_src/js/components/RepoActionView.vue b/web_src/js/components/RepoActionView.vue
index 69579d3687..cf1ed80ffc 100644
--- a/web_src/js/components/RepoActionView.vue
+++ b/web_src/js/components/RepoActionView.vue
@@ -15,14 +15,19 @@ type RunStatus = 'unknown' | 'waiting' | 'running' | 'success' | 'failure' | 'ca
 
 type StepContainerElement = HTMLElement & {_stepLogsActiveContainer?: HTMLElement}
 
-type LogLine = {
+export type LogLine = {
   index: number;
   timestamp: number;
   message: string;
 };
 
+// `##[group]` is from Azure Pipelines, just supported by the way. https://learn.microsoft.com/en-us/azure/devops/pipelines/scripts/logging-commands
 const LogLinePrefixesGroup = ['::group::', '##[group]'];
 const LogLinePrefixesEndGroup = ['::endgroup::', '##[endgroup]'];
+// https://github.com/actions/toolkit/blob/master/docs/commands.md
+// https://github.com/actions/runner/blob/main/docs/adrs/0276-problem-matchers.md#registration
+// Although there should be no `##[add-matcher]` syntax, there are still such outputs when using act-runner
+const LogLinePrefixesHidden = ['::add-matcher::', '##[add-matcher]', '::remove-matcher'];
 
 type LogLineCommand = {
   name: 'group' | 'endgroup',
@@ -63,6 +68,15 @@ function parseLineCommand(line: LogLine): LogLineCommand | null {
   return null;
 }
 
+export function shouldHideLine(line: LogLine): boolean {
+  for (const prefix of LogLinePrefixesHidden) {
+    if (line.message.startsWith(prefix)) {
+      return true;
+    }
+  }
+  return false;
+}
+
 function isLogElementInViewport(el: Element, {extraViewPortHeight}={extraViewPortHeight: 0}): boolean {
   const rect = el.getBoundingClientRect();
   // only check whether bottom is in viewport, because the log element can be a log group which is usually tall
@@ -315,6 +329,7 @@ export default defineComponent({
 
     appendLogs(stepIndex: number, startTime: number, logLines: LogLine[]) {
       for (const line of logLines) {
+        if (shouldHideLine(line)) continue;
         const el = this.getActiveLogsContainer(stepIndex);
         const cmd = parseLineCommand(line);
         if (cmd?.name === 'group') {