Claude GitHub Action fails with exit code 1 despite valid GitHub App token and correct setup

[ihsanyurttas]

Summary

Claude GitHub Action starts successfully but consistently fails with exit code 1, even though the setup appears correct and all required tokens are provided.

This does not appear to be a repository misconfiguration.

---

What works

• Workflow triggers correctly on issue_comment
• @claude mention is detected
• Claude posts initial comment: "Claude Code is working..."
• Anthropic API key is correctly configured
• GitHub App is created and installed
• Custom GitHub App token is generated and passed explicitly

---

Workflow

name: Claude Code

on:
  issue_comment:
    types: [created]

jobs:
  claude:
    if: contains(github.event.comment.body, '@claude')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      issues: write
      id-token: write

    steps:
      - uses: actions/create-github-app-token@v2
        id: app-token
        with:
          app-id: ${{ secrets.APP_ID }}
          private-key: ${{ secrets.APP_PRIVATE_KEY }}

      - uses: anthropics/claude-code-action@main
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          github_token: ${{ steps.app-token.outputs.token }}

[ihsanyurttas]

Happy to provide full logs or reproduce in a minimal repo if needed.