[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/34586968651

> [!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 13m 4s
Tokens ↑ 8.5m (8.0m cached) • ↓ 180.6k
Resume copilot --resume=ebfa06d4-e678-4ba9-a051-2cb372b13b02
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 0s
Resume copilot --resume=4317e459-5f49-42f7-8218-5b15f31f4397
```

### 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/34586968651
````

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/34586968651`

> [!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/34586968651) · copilot · 1.1K 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, then read .github/skills/agentic-workflows/SKILL.md for the debugging process. Investigate the reported HTTP 403 authentication failure and verify the workflow's resulting behavior. Done means the Expert Code Review workflow no longer fails for this agent authentication problem, or its failure reporting is intentionally configured as described.

Written by the indexing model from the issue text.