diff --git a/index.ts b/index.ts
index e2ba4e5..2d5566d 100644
--- a/index.ts
+++ b/index.ts
@@ -177,7 +177,9 @@ try {
   authConfigDir = await createAuthConfig()
   process.env["OPENCODE_AUTH_CONFIG_DIR"] = authConfigDir
 
-  proc = spawn(`opencode`, [`serve`, `--hostname=${HOST}`, `--port=${PORT}`])
+  proc = spawn(`opencode`, [`serve`, `--hostname=${HOST}`, `--port=${PORT}`], {
+    stdio: ["ignore", "inherit", "inherit"],
+  })
   assertContextEvent("issue_comment", "pull_request_review_comment")
   assertPayloadKeyword()
   await assertOpencodeConnected()
@@ -878,7 +880,16 @@ async function chat(text: string, files: PromptFiles = []) {
     body: JSON.stringify(body),
   })
 
-  const chatData = (await chatRes.json()) as { parts?: unknown[]; data?: { parts?: unknown[] } }
+  const rawText = await chatRes.text()
+  if (!chatRes.ok) {
+    throw new Error(`opencode /chat returned ${chatRes.status} ${chatRes.statusText}: ${rawText.slice(0, 1000)}`)
+  }
+  let chatData: { parts?: unknown[]; data?: { parts?: unknown[] } }
+  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 parts = chatData?.parts || chatData?.data?.parts || []