Feature request: expose per-run cost and token usage as Action outputs

[hudaif-eg]

Context

We're evaluating Claude Code cost across models in GitHub Actions. After inspecting the Action source and testing the released anthropics/claude-code-action@v1, we couldn't find a supported way to retrieve per-run usage metrics.

Our investigation found

• The Action completes successfully but does not expose cost/token metrics as outputs.
• The Claude CLI is not available after the Action, so /usage and /cost cannot be called in later workflow steps.
• show_full_output: true did not emit usage information in our logs.

Ask

Is there a supported way to retrieve per-run metrics such as:

• Total cost (USD)
• Input/output tokens
• Cache read/write tokens

If not, would you consider exposing these as official Action outputs if the underlying SDK provides them?

Proposed output names (for discussion):

total_cost_usd
input_tokens
output_tokens
cache_read_tokens
cache_write_tokens

This would be valuable for teams monitoring API spend per PR review run without needing to correlate against the Anthropic Console manually.