[aw] Expert Code Review (command) failed

### Workflow Failure

**Workflow:** [Expert Code Review (command)](https://github.com/dotnet/msbuild/blob/main/.github/workflows/review.agent.md)
**Branch:** main
**Run:** https://github.com/dotnet/msbuild/actions/runs/34234233273

> [!WARNING]
> **Engine Failure**: The `copilot` engine terminated unexpectedly.

**Last agent output:**
```
Check your COPILOT_PROVIDER_API_KEY or COPILOT_PROVIDER_BEARER_TOKEN.
Changes +0 -0
Duration 3m 37s
Tokens ↑ 1.5m (1.2m cached) • ↓ 16.3k
Resume copilot --resume=7a57f932-85a8-49e5-9d30-1755a7c6b66a
Authentication failed with provider at http://172.30.0.30:10002 (HTTP 403).
Check your COPILOT_PROVIDER_API_KEY or COPILOT_PROVIDER_BEARER_TOKEN.
Changes +0 -0
Duration 1s
Resume copilot --resume=4c857978-8316-4117-aee0-18d8b6e85f38
```

### Action Required

**Assign this issue to an agent** to debug and fix the issue.

Debug with any coding agent

Use this prompt with any coding agent (GitHub Copilot, Claude, Gemini, etc.):

````
Debug the agentic workflow failure using https://raw.githubusercontent.com/github/gh-aw/main/debug.md

The failed workflow run is at https://github.com/dotnet/msbuild/actions/runs/34234233273
````

Manually invoke the agent

Debug this workflow failure using your favorite Agent CLI and the `agentic-workflows` prompt.

- Start your agent
- Load the `agentic-workflows` skill from `.github/skills/agentic-workflows/SKILL.md` or
- Type `debug the agentic workflow review.agent failure in https://github.com/dotnet/msbuild/actions/runs/34234233273`

> [!TIP]
>
> Stop reporting this workflow as a failure
>
> To stop a workflow from creating failure issues, set `report-failure-as-issue: false` in its frontmatter:
> ```yaml
> safe-outputs:
> report-failure-as-issue: false
> ```
>
>

> Generated from [Expert Code Review (command)](https://github.com/dotnet/msbuild/actions/runs/34234233273) · copilot · 262.3 AIC · [◷](https://github.com/search?q=repo%3Adotnet%2Fmsbuild+is%3Aissue+%22gh-aw-workflow-id%3A+review.agent%22&type=issues)

Start with .github/workflows/review.agent.md and the failed run linked in the issue. Read debug.md and .github/skills/agentic-workflows/SKILL.md for the workflow-debugging process, then investigate the reported HTTP 403 authentication failure. Done means the workflow’s authentication failure is addressed and the review workflow can run successfully.

Written by the indexing model from the issue text.