diff --git a/create-or-update-issue/README.md b/create-or-update-issue/README.md
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+# Create Or Update Issue
+
+An action to create or update an issue in a repository.
+It supports posting a comment under an existing issue with the same title or
+closing it based on the outcome of a previous step.
+
+## Usage
+
+```yaml
+- uses: Homebrew/actions/create-or-update-issue@master
+  with:
+    token: ${{ github.token }} # defaults to this
+    repository: ${{ github.repository }} # defaults to this
+    title: Issue title
+    body: Issue body
+    labels: label1,label2 # optional
+    assignees: user1,user2 # optional
+    # If true: post `body` as a comment under the issue with the same title, if
+    # such an issue is found; otherwise, create a new issue.
+    update-existing: ${{ steps.<step-id>.conclusion == 'failure' }}
+    # If true: close an existing issue with the same title as completed, if such
+    # an issue is found; otherwise, do nothing.
+    close-existing: ${{ steps.<step-id>.conclusion == 'success' }}
+```
diff --git a/create-or-update-issue/action.yml b/create-or-update-issue/action.yml
new file mode 100644
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+++ b/create-or-update-issue/action.yml
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+name: Create or update issue
+description: Create or update an issue in a repository
+author: ZhongRuoyu
+branding:
+  icon: alert-circle
+  color: blue
+inputs:
+  token:
+    description: GitHub token
+    required: false
+    default: ${{ github.token }}
+  repository:
+    description: Repository to create or update the issue in
+    required: false
+    default: ${{ github.repository }}
+  title:
+    description: The title of the issue
+    required: true
+  body:
+    description: The body of the issue
+    required: true
+  labels:
+    description: Comma-separated list of labels to add to the issue
+    required: false
+  assignees:
+    description: Comma-separated list of users to assign the issue to
+    required: false
+  update-existing:
+    description: >
+      Whether to post `body` as a comment under the issue with the same title,
+      if such an issue is found; otherwise, create a new issue
+    required: false
+    default: "false"
+  close-existing:
+    description: >
+      Whether to close an existing issue with the same title as completed, if
+      such an issue is found; otherwise, do nothing.
+      NOTE: if set to `true`, no new issue will be created!
+    required: false
+    default: "false"
+outputs:
+  outcome:
+    description: >
+      One of `created`, `commented`, `closed`, or `none`; indicates the action
+      taken
+  issue_number:
+    description: >
+      The number of the created, updated, or closed issue; undefined if
+      `outcome` is `none`
+  node_id:
+    description: >
+      The node ID of the created or updated issue, used in GitHub GraphQL API
+      queries; undefined if `outcome` is `none`
+runs:
+  using: node20
+  main: main.mjs
diff --git a/create-or-update-issue/main.mjs b/create-or-update-issue/main.mjs
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+++ b/create-or-update-issue/main.mjs
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+import core from "@actions/core";
+import github from "@actions/github";
+
+async function main() {
+  try {
+    const token = core.getInput("token", { required: true });
+    const [owner, repo] =
+      core.getInput("repository", { required: true }).split("/");
+
+    const title = core.getInput("title", { required: true });
+    const body = core.getInput("body", { required: true });
+
+    const labelsInput = core.getInput("labels");
+    const labels = labelsInput ? labelsInput.split(",") : [];
+    const assigneesInput = core.getInput("assignees");
+    const assignees = assigneesInput ? assigneesInput.split(",") : [];
+
+    const updateExisting = core.getBooleanInput("update-existing");
+    const closeExisting = core.getBooleanInput("close-existing");
+
+    const client = github.getOctokit(token);
+
+    let existingIssue = undefined;
+    if (updateExisting || closeExisting) {
+      for await (const response of client.paginate.iterator(
+        client.rest.issues.listForRepo,
+        {
+          owner,
+          repo,
+          state: "open",
+          sort: "created",
+          direction: "desc",
+          per_page: 100,
+        }
+      )) {
+        existingIssue = response.data.find((issue) => issue.title === title);
+        if (existingIssue) {
+          break;
+        }
+      }
+    }
+    if (existingIssue) {
+      if (updateExisting) {
+        const response = await client.rest.issues.createComment({
+          owner,
+          repo,
+          issue_number: existingIssue.number,
+          body,
+        });
+        const commentUrl = response.data.html_url;
+
+        core.info(`Posted comment under existing issue: ${commentUrl}`);
+
+        core.setOutput("outcome", "commented");
+        core.setOutput("number", existingIssue.number);
+        core.setOutput("node_id", existingIssue.node_id);
+        return;
+      }
+      if (closeExisting) {
+        const response = await client.rest.issues.update({
+          owner,
+          repo,
+          issue_number: existingIssue.number,
+          state: "closed",
+          state_reason: "completed",
+        });
+        const issueUrl = response.data.html_url;
+
+        core.info(`Closed existing issue as completed: ${issueUrl}`);
+
+        core.setOutput("outcome", "closed");
+        core.setOutput("number", existingIssue.number);
+        core.setOutput("node_id", existingIssue.node_id);
+        return;
+      }
+    }
+
+    if (closeExisting) {
+      core.info("No existing issue found.");
+      core.setOutput("outcome", "none");
+      return;
+    }
+
+    const response = await client.rest.issues.create({
+      owner,
+      repo,
+      title,
+      body,
+      labels,
+      assignees,
+    });
+    const issueNumber = response.data.number;
+    const issueNodeId = response.data.node_id;
+    const issueUrl = response.data.html_url;
+
+    core.info(`Issue created: ${issueUrl}`);
+
+    core.setOutput("outcome", "created");
+    core.setOutput("number", issueNumber);
+    core.setOutput("node_id", issueNodeId);
+  } catch (error) {
+    core.setFailed(error);
+  }
+}
+
+await main();
diff --git a/create-or-update-issue/main.test.mjs b/create-or-update-issue/main.test.mjs
new file mode 100644
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--- /dev/null
+++ b/create-or-update-issue/main.test.mjs
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+import util from "node:util";
+
+describe("create-issue", async () => {
+  const token = "fake-token";
+  const title = "Issue title";
+  const body = "Issue body.\nLorem ipsum dolor sit amet.";
+  const labels = "label1,label2";
+  const assignees = "assignee1,assignee2";
+
+  const issueNumber = 12345;
+
+  beforeEach(async () => {
+    mockInput("token", token);
+    mockInput("repository", GITHUB_REPOSITORY);
+    mockInput("title", title);
+    mockInput("body", body);
+    mockInput("labels", labels);
+    mockInput("assignees", assignees);
+  });
+
+  it("creates an issue", async () => {
+    mockInput("update-existing", "false");
+    mockInput("close-existing", "false");
+
+    const mockPool = githubMockPool();
+
+    mockPool.intercept({
+      method: "POST",
+      path: `/repos/${GITHUB_REPOSITORY}/issues`,
+      headers: {
+        Authorization: `token ${token}`,
+      },
+      body: (htmlBody) => util.isDeepStrictEqual(JSON.parse(htmlBody), {
+        title,
+        body,
+        labels: labels.split(","),
+        assignees: assignees.split(","),
+      }),
+    }).defaultReplyHeaders({
+      "Content-Type": "application/json",
+    }).reply(200, {
+      number: issueNumber,
+    });
+
+    await loadMain();
+  });
+
+  it("for advanced use case with `close-existing: true`", async () => {
+    mockInput("update-existing", "true");
+    mockInput("close-existing", "false");
+
+    const mockPool = githubMockPool();
+
+    mockPool.intercept({
+      method: "GET",
+      path: `/repos/${GITHUB_REPOSITORY}/issues?` +
+        `direction=desc&per_page=100&sort=created&state=open`,
+      headers: {
+        Authorization: `token ${token}`,
+      },
+    }).defaultReplyHeaders({
+      "Content-Type": "application/json",
+    }).reply(200, [
+      {
+        title: "Not the same issue",
+        number: 54321,
+      },
+      {
+        title,
+        number: issueNumber,
+      },
+    ]);
+
+    mockPool.intercept({
+      method: "POST",
+      path: `/repos/${GITHUB_REPOSITORY}/issues/${issueNumber}/comments`,
+      headers: {
+        Authorization: `token ${token}`,
+      },
+      body: (htmlBody) => util.isDeepStrictEqual(JSON.parse(htmlBody), {
+        body,
+      }),
+    }).defaultReplyHeaders({
+      "Content-Type": "application/json",
+    }).reply(200, {
+      html_url: "https://github.com/owner/repo/issues/12345#issuecomment-67890",
+    });
+
+    await loadMain();
+  });
+
+  it("for advanced use case with `close-existing: true`", async () => {
+    mockInput("update-existing", "false");
+    mockInput("close-existing", "true");
+
+    const mockPool = githubMockPool();
+
+    mockPool.intercept({
+      method: "GET",
+      path: `/repos/${GITHUB_REPOSITORY}/issues?` +
+        `direction=desc&per_page=100&sort=created&state=open`,
+      headers: {
+        Authorization: `token ${token}`,
+      },
+    }).defaultReplyHeaders({
+      "Content-Type": "application/json",
+    }).reply(200, [
+      {
+        title: "Not the same issue",
+        number: 54321,
+      },
+      {
+        title,
+        number: issueNumber,
+      },
+    ]);
+
+    mockPool.intercept({
+      method: "PATCH",
+      path: `/repos/${GITHUB_REPOSITORY}/issues/${issueNumber}`,
+      headers: {
+        Authorization: `token ${token}`,
+      },
+      body: (htmlBody) => util.isDeepStrictEqual(JSON.parse(htmlBody), {
+        state: "closed",
+        state_reason: "completed",
+      }),
+    }).defaultReplyHeaders({
+      "Content-Type": "application/json",
+    }).reply(200, {
+      html_url: "https://github.com/owner/repo/issues/12345#issuecomment-67890",
+    });
+
+    await loadMain();
+  });
+});