fix(fullsend): use the correct model identifier

[gashcrumb]

This change updates the review agent config to use the suggested model identifier for Claude Sonnet.

rh-pre-commit.version: 2.4.0
rh-pre-commit.check-secrets: ENABLED

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[fullsend-ai-review]

🤖 Finished Review · ❌ Failure (validation failed after 1 iteration(s)) · Started 10:49 AM UTC · Completed 10:51 AM UTC

Commit: c52b047 · View workflow run →

Runtime: claude · Model: claude-sonnet-4-5@20250929 · Effort: high

[fullsend-ai-retro]

🤖 Finished Retro · ✅ Success · Started 10:55 AM UTC · Completed 11:06 AM UTC

Commit: c52b047 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $3.04

[fullsend-ai-retro]

Retro: PR #191 — fix(fullsend): use the correct model identifier

Timeline

1. PR chore: upgrade fullsend review harness #181 introduced .fullsend/harness/review.yaml with model: sonnet.
2. Issue Review harness model sonnet resolves to unavailable claude-sonnet-4-6 on Vertex AI #187 (08:25 UTC, retro-generated): The sonnet alias resolved to claude-sonnet-4-6, unavailable on the repo's Vertex AI endpoint. All automated reviews broken.
3. Triage agent (08:26–08:30 UTC, $0.69): Rated severity High, recommended changing to claude-sonnet-4-5@20250929.
4. Code agent (08:31–08:35 UTC, $0.82): Created PR #188, pinning model to claude-sonnet-4-5@20250929. CI failed because the title fix(#187): contained # in the scope, violating the repo's headerPattern regex.
5. Human intervention (~10:08 UTC): Stan Lewis renamed PR fix: pin review harness model to available Vertex AI version #188's title to remove the invalid scope character. PR fix: pin review harness model to available Vertex AI version #188 merged.
6. Issue Document PR title scope character restrictions in AGENTS.md #189 (retro-generated, still OPEN): Filed to document PR title scope character restrictions in AGENTS.md.
7. PR fix(fullsend): use the correct model identifier #191 (10:47 UTC, human-authored by Stan Lewis): Attempted to change model from claude-sonnet-4-5@20250929 to claude-sonnet-4@20250514 — the model the Vertex AI error message actually recommends.
8. Review agent failure (10:48–10:51 UTC): The review agent tried to use claude-sonnet-4-5@20250929 (from base branch config) and failed immediately — zero tokens used, no output produced. Validation failed.
9. PR fix(fullsend): use the correct model identifier #191 closed (10:54 UTC): Closed without merge.

Key Findings

The code agent's fix in PR #188 was incorrect. It pinned to claude-sonnet-4-5@20250929, which is also unavailable on Vertex AI. The Vertex AI error message explicitly suggests claude-sonnet-4@20250514, but the retro agent that filed issue #187 recommended a different (wrong) model, and the triage and code agents followed that recommendation without verification. The review agent has been broken on every PR since PR #188 was merged.

Chicken-and-egg problem. PR #191 attempted to fix the review agent's model config, but the review agent reads config from the base branch — which has the broken model. The review agent cannot review its own config fix.

Evidence for existing issues (skipped as proposals)

• Sonnet 4.5 model unavailable on Vertex causes review sub-agent failures and wasted retries fullsend-ai/fullsend#6922 (Sonnet 4.5 unavailable on Vertex): This retro provides another concrete instance — claude-sonnet-4-5@20250929 is unavailable, blocking all reviews on this repo.
• Review sub-agents should fall back to an available model when the primary model is unavailable fullsend-ai/fullsend#1771 (model fallback): If the review agent could fall back to an available model, both the PR fix(fullsend): use the correct model identifier #191 review and the chicken-and-egg problem would be avoided.
• Review sub-agents should handle model unavailability with fallback or explicit alerting fullsend-ai/agents#379 (model unavailability handling): Fallback would prevent complete review failure.
• Review sub-agent sonnet alias resolves to unavailable model despite fleet pin fullsend-ai/agents#1186 (sonnet alias resolves to unavailable model): The original trigger (issue Review harness model sonnet resolves to unavailable claude-sonnet-4-6 on Vertex AI #187) is another instance of this pattern.
• Document PR title scope character restrictions in AGENTS.md #189 (PR title scope restrictions): Still open — the code agent's title fix(#187): is the motivating example.

Proposals filed

• Review harness model claude-sonnet-4-5@20250929 is unavailable — all reviews blocked (in redhat-developer/rhdh-cli)

Proposals skipped (target repo not allowed)

File manually or update create_issues.allow_targets in config.yaml:

• Retro agent recommended unavailable model — should extract suggestion from error output (fullsend-ai/agents)