fix(kiro-cli): parse output prefix to strip banner from responses

src/agents/cli-backends.ts

@@ -90,6 +90,7 @@ const DEFAULT_KIRO_BACKEND: CliBackendConfig = {
   command: "kiro-cli",
   args: ["chat", "--no-interactive", "--wrap", "never"],
   output: "text",
+  outputPrefix: "> ",
   input: "arg",
   modelArg: "--model",
   modelAliases: KIRO_MODEL_ALIASES,

src/agents/cli-runner.ts

@@ -265,6 +265,19 @@ export async function runCliAgent(params: {
       const outputMode = useResume ? (backend.resumeOutput ?? backend.output) : backend.output;
 
       if (outputMode === "text") {
+        // If outputPrefix is set, extract only lines starting with that prefix
+        if (backend.outputPrefix) {
+          const prefix = backend.outputPrefix;
+          const lines = stdout.split("\n");
+          const responseLines: string[] = [];
+          for (const line of lines) {
+            if (line.startsWith(prefix)) {
+              responseLines.push(line.slice(prefix.length));
+            }
+          }
+          const text = responseLines.join("\n").trim();
+          return { text: text || stdout, sessionId: undefined };
+        }
         return { text: stdout, sessionId: undefined };
       }
       if (outputMode === "jsonl") {

src/config/types.agent-defaults.ts

@@ -55,6 +55,8 @@ export type CliBackendConfig = {
   output?: "json" | "text" | "jsonl";
   /** Output parsing mode when resuming a CLI session. */
   resumeOutput?: "json" | "text" | "jsonl";
+  /** For text output: prefix that marks response lines (e.g. "> " for kiro-cli). */
+  outputPrefix?: string;
   /** Prompt input mode (default: arg). */
   input?: "arg" | "stdin";
   /** Max prompt length for arg mode (if exceeded, stdin is used). */