From 4bf882ba81ffba016357f75b8b1ea1a36f813433 Mon Sep 17 00:00:00 2001
From: Jeon Suyeol <devxoul@gmail.com>
Date: Fri, 19 Dec 2025 01:35:40 +0900
Subject: [PATCH] fix(command): validate model before executing slash command
 (#5740)

---
 packages/opencode/src/session/prompt.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index ff5194d55..cbb3eedf3 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -1333,6 +1333,20 @@ export namespace SessionPrompt {
       if (input.model) return Provider.parseModel(input.model)
       return await lastModel(input.sessionID)
     })()
+
+    try {
+      await Provider.getModel(model.providerID, model.modelID)
+    } catch (e) {
+      if (Provider.ModelNotFoundError.isInstance(e)) {
+        const { providerID, modelID, suggestions } = e.data
+        const hint = suggestions?.length ? ` Did you mean: ${suggestions.join(", ")}?` : ""
+        Bus.publish(Session.Event.Error, {
+          sessionID: input.sessionID,
+          error: new NamedError.Unknown({ message: `Model not found: ${providerID}/${modelID}.${hint}` }).toObject(),
+        })
+      }
+      throw e
+    }
     const agent = await Agent.get(agentName)
 
     const parts =