diff --git a/github/check/action.yml b/github/check/action.yml
new file mode 100644
index 000000000..732d67b3a
--- /dev/null
+++ b/github/check/action.yml
@@ -0,0 +1,48 @@
+name: "opencode GitHub Run"
+description: "Run opencode in GitHub Actions workflows"
+branding:
+  icon: "code"
+  color: "orange"
+
+inputs:
+  model:
+    description: "The model to use with opencode. Takes the format of `provider/model`."
+    required: true
+
+  prompt:
+    description: "The prompt to use with opencode."
+    required: true
+
+  share:
+    description: "Whether to share the opencode session. Defaults to true for public repositories."
+    required: false
+
+  token:
+    description: "Optional GitHub access token for performing operations such as creating comments, committing changes, and opening pull requests. Defaults to the installation access token from the opencode GitHub App."
+    required: false
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install opencode
+      shell: bash
+      run: curl -fsSL https://opencode.ai/install | bash
+
+    - name: Install bun
+      shell: bash
+      run: npm install -g bun
+
+    - name: Install dependencies
+      shell: bash
+      run: |
+        cd ${GITHUB_ACTION_PATH}
+        bun install
+
+    - name: Run opencode
+      shell: bash
+      run: bun ${GITHUB_ACTION_PATH}/index.ts
+      env:
+        MODEL: ${{ inputs.model }}
+        PROMPT: ${{ inputs.prompt }}
+        SHARE: ${{ inputs.share }}
+        TOKEN: ${{ inputs.token }}
diff --git a/github/check/index.ts b/github/check/index.ts
new file mode 100644
index 000000000..587603ba7
--- /dev/null
+++ b/github/check/index.ts
@@ -0,0 +1,61 @@
+import { $ } from "bun"
+import * as core from "@actions/core"
+import { Auth } from "../src/auth"
+import { Git } from "../src/git"
+import { Opencode } from "../src/opencode"
+import { Context } from "../src/context"
+
+try {
+  Context.assertEventName("pull_request_opened", "pull_request_synchronize")
+  await check()
+  process.exit(0)
+} catch (e: any) {
+  console.error(e)
+  let msg = e
+  if (e instanceof $.ShellError) msg = e.stderr.toString()
+  else if (e instanceof Error) msg = e.message
+  core.setFailed(msg)
+  // Also output the clean error message for the action to capture
+  //core.setOutput("prepare_error", e.message);
+  process.exit(1)
+}
+
+export async function check() {
+  try {
+    await Git.configure()
+    await Opencode.start()
+
+    const filename = "check-failed-reason.json"
+    const pr = Context.payloadPullRequest()
+    await Opencode.chat(`
+A pull request has been created or updated: '${pr.title}'
+
+<pr-number>
+${pr.number}
+</pr-number>
+
+<pr-description>
+${pr.body}
+</pr-description>
+
+Please check:
+<check>
+${process.env.PROMPT}
+</check>
+
+If the check failed, write the reason to ${filename}. Keep the reason short and concise, only one sentence.
+
+If the check passed, do not create any file.
+      `)
+
+    // check file exists
+    try {
+      const reason = await Bun.file(filename).text()
+      if (reason) throw new Error(reason)
+    } catch (e) {}
+  } finally {
+    Opencode.closeServer()
+    await Auth.revoke()
+    await Git.restore()
+  }
+}