Add set_output tool (#205)

utils/instructions.ts

@@ -100,6 +100,13 @@ function getShellInstructions(bash: ResolvedPayload["bash"]): string {
   }
 }
 
+function getStandaloneModeInstructions(trigger: string): string {
+  if (trigger !== "unknown") {
+    return "";
+  }
+  return `**Standalone mode**: You are running as a step in a user-defined CI workflow. When you complete your task, call \`${ghPullfrogMcpName}/set_output\` with the main result of your work (generated content, summary of changes, analysis results, etc.). This makes it available as a GitHub Action output named \`result\` for subsequent workflow steps to consume.`;
+}
+
 export interface ResolvedInstructions {
   full: string;
   system: string;
@@ -187,6 +194,8 @@ Tool names may be formatted as \`(server name)/(tool name)\`, for example: \`${g
 
 ${getShellInstructions(ctx.payload.bash)}
 
+${getStandaloneModeInstructions(ctx.payload.event.trigger)}
+
 **Command execution**: Never use \`sleep\` to wait for commands to complete. Commands run synchronously - when the bash tool returns, the command has finished.
 
 **Commenting style**: When posting comments via ${ghPullfrogMcpName}, write as a professional team member would. Your final comments should be polished and actionable—do not include intermediate reasoning like "I'll now look at the code" or "Let me respond to the question."

utils/run.ts

@@ -2,7 +2,7 @@ import type { AgentResult } from "../agents/shared.ts";
 import type { MainResult } from "../main.ts";
 import { log } from "./cli.ts";
 
-export async function handleAgentResult(result: AgentResult): Promise<MainResult> {
+export function handleAgentResult(result: AgentResult): MainResult {
   if (!result.success) {
     return {
       success: false,