fix: make AgentRun log tail render-only

scripts/src/agentrun.ts

@@ -498,12 +498,54 @@ async function resourceLogs(config: UniDeskConfig | null, command: string, actio
   const effectiveLimit = options.tail ?? options.limit;
   const logArgs = ["output", ref.name, "--limit", String(effectiveLimit)];
   if (options.afterSeq !== null) logArgs.push("--after-seq", String(options.afterSeq));
-  else logArgs.push("--tail");
   if (options.fullText) logArgs.push("--full-text");
-  const result = await runAgentRunRestCommand(config, "sessions", logArgs);
+  let result: Record<string, unknown>;
+  if (options.afterSeq === null && options.tail !== null) {
+    result = await resourceLogsTailResult(config, ref.name, effectiveLimit, options.fullText);
+  } else {
+    result = await runAgentRunRestCommand(config, "sessions", logArgs);
+  }
   return renderEventLike(command, result, { ...options, limit: effectiveLimit }, "Log", normalizeLogItems(innerData(result)), ref.name);
 }
 
+async function resourceLogsTailResult(config: UniDeskConfig | null, sessionId: string, limit: number, fullText: boolean): Promise<Record<string, unknown>> {
+  const session = record(innerData(await runAgentRunRestCommand(config, "sessions", ["show", sessionId])));
+  const lastSeq = nonNegativeIntegerOrNull(session.lastEventSeq) ?? 0;
+  let window = Math.max(limit * 4, 100);
+  let result: Record<string, unknown> | null = null;
+  let data: Record<string, unknown> = {};
+  for (let attempt = 0; attempt < 6; attempt += 1) {
+    const afterSeq = Math.max(0, lastSeq - window);
+    const queryLimit = Math.max(limit, Math.min(1000, window));
+    const args = ["output", sessionId, "--limit", String(queryLimit), "--after-seq", String(afterSeq)];
+    if (fullText) args.push("--full-text");
+    result = await runAgentRunRestCommand(config, "sessions", args);
+    data = record(innerData(result));
+    const items = arrayRecords(data.items);
+    if (items.length >= limit || afterSeq === 0) break;
+    window *= 2;
+  }
+  if (result === null) return await runAgentRunRestCommand(config, "sessions", ["output", sessionId, "--limit", String(limit), "--after-seq", "0"]);
+  const items = arrayRecords(data.items);
+  const tailedItems = items.slice(-limit);
+  const lastReturnedSeq = tailedItems.length > 0 ? nonNegativeIntegerOrNull(tailedItems[tailedItems.length - 1]?.seq) : null;
+  return {
+    ...result,
+    data: {
+      ...data,
+      items: tailedItems,
+      count: tailedItems.length,
+      cursor: lastReturnedSeq === null ? data.cursor : String(lastReturnedSeq),
+      clientTail: {
+        requested: limit,
+        sourceLastEventSeq: lastSeq,
+        scanned: items.length,
+        valuesPrinted: false,
+      },
+    },
+  };
+}
+
 async function resourceResult(config: UniDeskConfig | null, command: string, action: string | undefined, args: string[], options: AgentRunResourceOptions): Promise<RenderedCliResult> {
   const ref = parseResourceRef(action, args);
   if (ref.kind === "run") {
@@ -4029,6 +4071,12 @@ function stringOrNull(value: unknown): string | null {
   return typeof value === "string" && value.length > 0 ? value : null;
 }
 
+function nonNegativeIntegerOrNull(value: unknown): number | null {
+  if (typeof value === "number" && Number.isInteger(value) && value >= 0) return value;
+  if (typeof value === "string" && /^\d+$/u.test(value)) return Number(value);
+  return null;
+}
+
 function parseArgoStatus(text: string): { revision: string | null; syncStatus: string | null; healthStatus: string | null } {
   const lines = text.split(/\r?\n/u);
   const index = lines.findIndex((line) => line.trim() === "argo");