What happened
PR #181 added a derived review harness at .fullsend/harness/review.yaml with model: sonnet to switch reviews from Opus to Sonnet. The PR was merged on 2026-09-09 at 08:11 UTC. The first review attempt using the new config (run 34327800934 on PR #176) failed immediately (5 seconds, 0 tokens used) with the error: "The model claude-sonnet-4-6 is not available on your vertex deployment. Try --model to switch to claude-sonnet-4-5@20250929, or ask your admin to enable this model." The sonnet alias resolved to claude-sonnet-4-6, which is not provisioned on the repo's GCP Vertex AI endpoint.
What could go better
The derived harness uses the generic model: sonnet alias, which resolves to the latest Sonnet version at runtime. On Vertex AI deployments, model availability depends on what the admin has provisioned — latest-version aliases can resolve to models that aren't yet enabled. The model override was not validated against the deployment before merging. High confidence: this is confirmed by the error in run 34327800934, and all reviews on this repo will fail until corrected.
Proposed change
Update .fullsend/harness/review.yaml to use an explicit model version known to be available on the Vertex AI deployment. Based on the error message, change model: sonnet to model: claude-sonnet-4-5@20250929. Alternatively, coordinate with the GCP admin to enable claude-sonnet-4-6 on the deployment and keep the current config. The explicit version pin is safer because it avoids future breakage if the sonnet alias advances again before the deployment is updated.
Validation criteria
After the config fix, trigger /fs-review on PR #176 (or any open PR) and verify: (1) the review agent starts successfully without a model availability error, (2) the review completes and posts findings, (3) the status comment shows the correct Sonnet model version.
Generated by retro agent from #181
What happened
PR #181 added a derived review harness at
.fullsend/harness/review.yamlwithmodel: sonnetto switch reviews from Opus to Sonnet. The PR was merged on 2026-09-09 at 08:11 UTC. The first review attempt using the new config (run 34327800934 on PR #176) failed immediately (5 seconds, 0 tokens used) with the error: "The model claude-sonnet-4-6 is not available on your vertex deployment. Try --model to switch to claude-sonnet-4-5@20250929, or ask your admin to enable this model." Thesonnetalias resolved toclaude-sonnet-4-6, which is not provisioned on the repo's GCP Vertex AI endpoint.What could go better
The derived harness uses the generic
model: sonnetalias, which resolves to the latest Sonnet version at runtime. On Vertex AI deployments, model availability depends on what the admin has provisioned — latest-version aliases can resolve to models that aren't yet enabled. The model override was not validated against the deployment before merging. High confidence: this is confirmed by the error in run 34327800934, and all reviews on this repo will fail until corrected.Proposed change
Update
.fullsend/harness/review.yamlto use an explicit model version known to be available on the Vertex AI deployment. Based on the error message, changemodel: sonnettomodel: claude-sonnet-4-5@20250929. Alternatively, coordinate with the GCP admin to enableclaude-sonnet-4-6on the deployment and keep the current config. The explicit version pin is safer because it avoids future breakage if thesonnetalias advances again before the deployment is updated.Validation criteria
After the config fix, trigger
/fs-reviewon PR #176 (or any open PR) and verify: (1) the review agent starts successfully without a model availability error, (2) the review completes and posts findings, (3) the status comment shows the correct Sonnet model version.Generated by retro agent from #181