review errors

internal/agents/review.go

@@ -8,6 +8,7 @@ import (
 	"log/slog"
 	"net/http"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"time"
@@ -115,12 +116,15 @@ func playwrightMCP(outputDir string) mcp.Stdio {
 	}
 }
 
-func (m *Manager) implementerVendor(ctx context.Context, taskID string) api.AgentSessionVendor {
+var vendorCommands = map[api.AgentSessionVendor]string{api.Claude: "claude", api.Codex: "codex", api.Antigravity: "agy"}
+
+func (m *Manager) implementerModel(ctx context.Context, taskID string) (api.AgentSessionVendor, string) {
 	sessions, err := m.store.ListSessions(ctx, taskID)
 	if err != nil || len(sessions) == 0 {
-		return api.Claude
+		return api.Claude, reviewModels[api.Claude]
 	}
-	return sessions[len(sessions)-1].Vendor
+	last := sessions[len(sessions)-1]
+	return last.Vendor, last.Model
 }
 
 func reviewVendor(implementer api.AgentSessionVendor) api.AgentSessionVendor {
@@ -130,13 +134,22 @@ func reviewVendor(implementer api.AgentSessionVendor) api.AgentSessionVendor {
 	return api.Codex
 }
 
+func (m *Manager) reviewerModel(ctx context.Context, taskID string) (api.AgentSessionVendor, string) {
+	implVendor, implModel := m.implementerModel(ctx, taskID)
+	vendor := reviewVendor(implVendor)
+	_, err := exec.LookPath(vendorCommands[vendor])
+	if err != nil {
+		return implVendor, implModel
+	}
+	return vendor, reviewModels[vendor]
+}
+
 func (m *Manager) startReviewer(ctx context.Context, task api.Task, snap api.Snapshot) error {
 	project, err := m.store.GetProject(ctx, task.ProjectId)
 	if err != nil {
 		return err
 	}
-	vendor := reviewVendor(m.implementerVendor(ctx, task.Id))
-	model := reviewModels[vendor]
+	vendor, model := m.reviewerModel(ctx, task.Id)
 	prompt, err := m.reviewPrompt(ctx, task, project, snap)
 	if err != nil {
 		return err

internal/agents/snapshots.go

@@ -269,7 +269,7 @@ func (m *Manager) takeSnapshotTool(l *live) mcp.Tool {
 	}
 }
 
-const takeSnapshotDescription = "Snapshot a task's worktree now, uncommitted work included, and start a review of it: a reviewer on the other vendor reviews all of the task's work against the default branch. " +
+const takeSnapshotDescription = "Snapshot a task's worktree now, uncommitted work included, and start a review of it: a reviewer on the other vendor (or on yours, when the other isn't installed) reviews all of the task's work against the default branch. " +
 	"byre already does this at the end of every turn that changes files; call this to review work mid-turn, or to retry a review that failed (it snapshots even when nothing changed since the last snapshot)."
 
 func (m *Manager) dropSnapshots(repo, taskID string) error {