opencode GitHub Action #

A GitHub Action that integrates opencode directly into your GitHub workflow.

Mention /opencode in your comment, and opencode will execute tasks within your GitHub Actions runner.

Features #

Explain an issue #

Leave the following comment on a GitHub issue. opencode will read the entire thread, including all comments, and reply with a clear explanation.

/opencode explain this issue

Fix an issue #

Leave the following comment on a GitHub issue. opencode will create a new branch, implement the changes, and open a PR with the changes.

/opencode fix this

Review PRs and make changes #

Leave the following comment on a GitHub PR. opencode will implement the requested change and commit it to the same PR.

Delete the attachment from S3 when the note is removed /oc

Review specific code lines #

Leave a comment directly on code lines in the PR's "Files" tab. opencode will automatically detect the file, line numbers, and diff context to provide precise responses.

[Comment on specific lines in Files tab]
/oc add error handling here

When commenting on specific lines, opencode receives:

The exact file being reviewed
The specific lines of code
The surrounding diff context
Line number information

This allows for more targeted requests without needing to specify file paths or line numbers manually.

Installation #

Run the following command in the terminal from your GitHub repo:

opencode github install

This will walk you through installing the GitHub app, creating the workflow, and setting up secrets.

Manual Setup #

Install the GitHub app https://github.com/apps/opencode-agent. Make sure it is installed on the target repository.

Add the following workflow file to .github/workflows/opencode.yml in your repo. Set the appropriate model and required API keys in env.

name: opencode

on:
  issue_comment:
    types: [created]
  pull_request_review_comment:
    types: [created]

jobs:
  opencode:
    if: |
      contains(github.event.comment.body, '/oc') ||
      contains(github.event.comment.body, '/opencode')
    runs-on: ubuntu-latest
    permissions:
      id-token: write
    steps:
       - name: Checkout repository
         uses: actions/checkout@v6
         with:
           fetch-depth: 1
           persist-credentials: false

       - name: Run opencode
        uses: anomalyco/opencode/github@latest
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          model: anthropic/claude-sonnet-4-20250514
          use_github_token: true

Store the API keys in secrets. In your organization or project settings, expand Secrets and variables on the left and select Actions. Add the required API keys.

Support #

This is an early release. If you encounter issues or have feedback, please create an issue at https://github.com/anomalyco/opencode/issues.

Development #

To test locally:

Navigate to a test repo (e.g. hello-world):
```
cd hello-world
```
Run:
```
MODEL=anthropic/claude-sonnet-4-20250514 \
  ANTHROPIC_API_KEY=sk-ant-api03-1234567890 \
  GITHUB_RUN_ID=dummy \
  MOCK_TOKEN=github_pat_1234567890 \
  MOCK_EVENT='{"eventName":"issue_comment",...}' \
  bun /path/to/opencode/github/index.ts
```
- MODEL: The model used by opencode. Same as the MODEL defined in the GitHub workflow.
- ANTHROPIC_API_KEY: Your model provider API key. Same as the keys defined in the GitHub workflow.
- GITHUB_RUN_ID: Dummy value to emulate GitHub action environment.
- MOCK_TOKEN: A GitHub personal access token. This token is used to verify you have admin or write access to the test repo. Generate a token here.
- MOCK_EVENT: Mock GitHub event payload (see templates below).
- /path/to/opencode: Path to your cloned opencode repo. bun /path/to/opencode/github/index.ts runs your local version of opencode.

Issue comment event #

MOCK_EVENT='{"eventName":"issue_comment","repo":{"owner":"sst","repo":"hello-world"},"actor":"fwang","payload":{"issue":{"number":4},"comment":{"id":1,"body":"hey opencode, summarize thread"}}}'

Replace:

"owner":"sst" with repo owner
"repo":"hello-world" with repo name
"actor":"fwang" with the GitHub username of commenter
"number":4 with the GitHub issue id
"body":"hey opencode, summarize thread" with comment body

Issue comment with image attachment. #

MOCK_EVENT='{"eventName":"issue_comment","repo":{"owner":"sst","repo":"hello-world"},"actor":"fwang","payload":{"issue":{"number":4},"comment":{"id":1,"body":"hey opencode, what is in my image ![Image](https://github.com/user-attachments/assets/xxxxxxxx)"}}}'

Replace the image URL https://github.com/user-attachments/assets/xxxxxxxx with a valid GitHub attachment (you can generate one by commenting with an image in any issue).

PR comment event #

MOCK_EVENT='{"eventName":"issue_comment","repo":{"owner":"sst","repo":"hello-world"},"actor":"fwang","payload":{"issue":{"number":4,"pull_request":{}},"comment":{"id":1,"body":"hey opencode, summarize thread"}}}'

PR review comment event #

MOCK_EVENT='{"eventName":"pull_request_review_comment","repo":{"owner":"sst","repo":"hello-world"},"actor":"fwang","payload":{"pull_request":{"number":7},"comment":{"id":1,"body":"hey opencode, add error handling","path":"src/components/Button.tsx","diff_hunk":"@@ -45,8 +45,11 @@\n- const handleClick = () => {\n-   console.log('clicked')\n+ const handleClick = useCallback(() => {\n+   console.log('clicked')\n+   doSomething()\n+ }, [doSomething])","line":47,"original_line":45,"position":10,"commit_id":"abc123","original_commit_id":"def456"}}}'