diff --git a/index.ts b/index.ts
index fe0d48d..918d49c 100644
--- a/index.ts
+++ b/index.ts
@@ -955,19 +955,35 @@ async function chat(text: string, files: PromptFiles = []) {
   if (!chatRes.ok) {
     throw new Error(`opencode /chat returned ${chatRes.status} ${chatRes.statusText}: ${rawText.slice(0, 1000)}`)
   }
-  let chatData: { parts?: unknown[]; data?: { parts?: unknown[] } }
+  let chatData: any
   try {
     chatData = JSON.parse(rawText)
   } catch (e) {
     throw new Error(`opencode /chat returned non-JSON (status ${chatRes.status}, content-type ${chatRes.headers.get("content-type")}): ${rawText.slice(0, 1000)}`)
   }
 
-  // Find the last text part in the response
+  const info = chatData?.info ?? chatData?.data?.info
   const parts = chatData?.parts || chatData?.data?.parts || []
-  const match = parts.findLast((p: any) => p.type === "text") as { text: string } | undefined
-  if (!match) throw new Error("Failed to parse the text response")
 
-  return match.text
+  // Surface a provider/model error instead of the generic parse failure.
+  if (info?.error) {
+    throw new Error(`opencode model error: ${JSON.stringify(info.error).slice(0, 2000)}`)
+  }
+
+  // Prefer the last non-empty text part.
+  const textParts = parts.filter((p: any) => p.type === "text" && p.text?.trim())
+  const last = textParts[textParts.length - 1] as { text: string } | undefined
+  if (last) return last.text
+
+  // The agent may have done work (edited files) without a closing text message.
+  // Don't hard-fail in that case; report what happened instead.
+  console.error("No text part. Part types:", parts.map((p: any) => p.type).join(", ") || "none")
+  const ranTools = parts.some((p: any) => p.type === "tool")
+  if (ranTools) return "_(opencode completed the run but produced no summary message.)_"
+
+  throw new Error(
+    `Failed to parse the text response (parts: ${parts.map((p: any) => p.type).join(", ") || "none"}; raw: ${rawText.slice(0, 1000)})`,
+  )
 }
 
 // ─── Prompt building ────────────────────────────────────────────────────────