anthropics/claude-code-action@beta incorrectly reports billing/spending limit error despite working API key

Bug Report for Anthropic GitHub Action

Issue Title:

anthropics/claude-code-action@beta incorrectly reports billing/spending limit error despite working API key

Bug Description:

The anthropics/claude-code-action@beta consistently fails with a billing error message, despite:
- Using a valid API key from an account with no billing issues
- Anthropic Console showing no rate limit events
- The same API key working fine in other contexts (Claude Code CLI)

Error Message:

The job was not started because recent account payments have failed or your spending limit needs to be increased. Please check the 'Billing & plans' section in your settings

Environment:

- Repository: cjbuchanan/blue_compass
- GitHub Action: anthropics/claude-code-action@beta
- Workflow: Claude Code Review
- Runner: ubuntu-latest
- Secret: ANTHROPIC_API_KEY (confirmed valid)

Workflow Configuration:

name: Claude Code Review

on:
pull_request:
types: [opened, synchronize]

jobs:
claude-review:
runs-on: ubuntu-latest
permissions:
contents: read
pull-requests: write
issues: read
id-token: write

steps:
- name: Checkout repository
uses: actions/checkout@v4
with:
fetch-depth: 0

- name: Run Claude Code Review
uses: anthropics/claude-code-action@beta
with:
anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
model: "claude-sonnet-4-20250514"
direct_prompt: |
Please provide a brief code review focusing on:
- Code quality and potential bugs
- Security concerns
- Best practices

Failed Runs:

- Run #81: https://github.com/cjbuchanan/blue_compass/actions/runs/15947368579
- Multiple previous runs with identical error
- Pattern: Job fails before any steps execute (at job initialization level)

Verification Steps Taken:

1. ✅ API Key Verified: Same key works in Claude Code CLI
2. ✅ Console Checked: No billing issues or rate limits in Anthropic Console
3. ✅ Secret Configured: ANTHROPIC_API_KEY properly set in repository secrets
4. ✅ Permissions: Repository has Actions enabled with "all" actions allowed
5. ✅ Models Tested: Tried both default and explicit model specifications
6. ✅ Prompt Simplified: Reduced token usage to minimal test case

Expected Behavior:

The GitHub Action should successfully authenticate and provide code review using the valid API key.

Actual Behavior:

The job fails immediately with billing error before executing any workflow steps.

Additional Context:

- This appears to be a false positive in the Action's billing detection
- The error occurs at the GitHub Actions job level, not within Action steps
- Same configuration worked in other repositories/contexts
- Issue persists across multiple workflow runs and configuration changes

Impact:

Unable to use automated Claude code reviews despite having valid Anthropic account and API access.