diff --git a/.github/workflows/test-action.yml b/.github/workflows/test-action.yml
index af1848a..667fba0 100644
--- a/.github/workflows/test-action.yml
+++ b/.github/workflows/test-action.yml
@@ -19,21 +19,9 @@ jobs:
         id: checkout
         uses: actions/checkout@v4
 
-      - name: Get PR_NUMBER for issue_comment triggered events
-        id: get-pr-number
-        if: github.event.issue.pull_request
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          PR_URL="${{ github.event.issue.pull_request.url }}"
-          PR_NUM=${PR_URL##*/}
-          echo "pr-number=$PR_NUM" >> "$GITHUB_OUTPUT"
-
       - name: Test Local Action
         id: test-action
         uses: ./
-        with:
-          pr_number: ${{ steps.get-pr-number.outputs.pr-number }}
 
       - name: Print Output
         id: output
diff --git a/action.yml b/action.yml
index 166443d..0180a42 100644
--- a/action.yml
+++ b/action.yml
@@ -13,10 +13,12 @@ inputs:
     description: 'a github access token'
     required: true
     default: ${{ github.token }}
-  pr_number:
+  pr_url:
     description:
-      'a target pr number. This is set for events triggered by issue_comment'
-    required: false
+      'the target pr url. This is used for taking pr number in workflows
+      triggered by "issue_comment" event'
+    required: true
+    default: ${{ github.event.issue.pull_request.url }}
 
 # Define your outputs here.
 outputs:
diff --git a/dist/index.js b/dist/index.js
index b2f2639..90a33ae 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -29008,6 +29008,7 @@ Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.run = void 0;
 const core = __importStar(__nccwpck_require__(9093));
 const github_1 = __nccwpck_require__(5942);
+const option_1 = __nccwpck_require__(6335);
 const uniqueStringArray = (texts) => {
     if (texts.length === 0)
         return [];
@@ -29026,13 +29027,7 @@ const uniqueStringArray = (texts) => {
  */
 async function run() {
     try {
-        const prNumber = github_1.context.payload.pull_request?.number ||
-            Number(core.getInput('pr_number', { required: false }));
-        if (isNaN(prNumber) || prNumber === 0) {
-            core.setFailed('pr number is not set properly');
-            return;
-        }
-        const token = core.getInput('github_token', { required: true });
+        const { token, prNumber } = (0, option_1.getOption)();
         const octokit = (0, github_1.getOctokit)(token);
         const owner = github_1.context.repo.owner;
         const repo = github_1.context.repo.repo;
@@ -29072,6 +29067,39 @@ the number of the comments is ${comments.length} and the review comments is ${re
 exports.run = run;
 
 
+/***/ }),
+
+/***/ 6335:
+/***/ ((__unused_webpack_module, exports, __nccwpck_require__) => {
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", ({ value: true }));
+exports.getOption = void 0;
+const core_1 = __nccwpck_require__(9093);
+const github_1 = __nccwpck_require__(5942);
+function getPrNumber() {
+    if (typeof github_1.context.payload.pull_request?.number === 'number') {
+        return github_1.context.payload.pull_request.number;
+    }
+    const url = (0, core_1.getInput)('pr_url', { required: false });
+    const numberFromUrl = Number(url.substring(url.lastIndexOf('/') + 1));
+    return numberFromUrl;
+}
+function getOption() {
+    const token = (0, core_1.getInput)('github_token', { required: true });
+    const prNumber = getPrNumber();
+    if (isNaN(prNumber) || prNumber === 0) {
+        (0, core_1.setFailed)('pr number is not set properly');
+    }
+    return {
+        token,
+        prNumber
+    };
+}
+exports.getOption = getOption;
+
+
 /***/ }),
 
 /***/ 9491:
diff --git a/src/main.ts b/src/main.ts
index b0ea662..28d0ac2 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,5 +1,6 @@
 import * as core from '@actions/core'
 import { getOctokit, context } from '@actions/github'
+import { getOption } from './option'
 
 const uniqueStringArray = (texts: string[]): string[] => {
   if (texts.length === 0) return []
@@ -22,15 +23,8 @@ const uniqueStringArray = (texts: string[]): string[] => {
  */
 export async function run(): Promise<void> {
   try {
-    const prNumber =
-      context.payload.pull_request?.number ||
-      Number(core.getInput('pr_number', { required: false }))
-    if (isNaN(prNumber) || prNumber === 0) {
-      core.setFailed('pr number is not set properly')
-      return
-    }
+    const { token, prNumber } = getOption()
 
-    const token = core.getInput('github_token', { required: true })
     const octokit = getOctokit(token)
     const owner = context.repo.owner
     const repo = context.repo.repo
diff --git a/src/option.ts b/src/option.ts
new file mode 100644
index 0000000..6042850
--- /dev/null
+++ b/src/option.ts
@@ -0,0 +1,31 @@
+import { getInput, setFailed } from '@actions/core'
+import { context } from '@actions/github'
+
+type Option = {
+  token: string
+  prNumber: number
+}
+
+function getPrNumber(): number {
+  if (typeof context.payload.pull_request?.number === 'number') {
+    return context.payload.pull_request.number
+  }
+
+  const url = getInput('pr_url', { required: false })
+  const numberFromUrl = Number(url.substring(url.lastIndexOf('/') + 1))
+  return numberFromUrl
+}
+
+export function getOption(): Option {
+  const token = getInput('github_token', { required: true })
+
+  const prNumber = getPrNumber()
+  if (isNaN(prNumber) || prNumber === 0) {
+    setFailed('pr number is not set properly')
+  }
+
+  return {
+    token,
+    prNumber
+  }
+}