fix(status): account cached prompt tokens

src/auto-reply/status.test.ts

@@ -1,5 +1,7 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
 import { afterEach, describe, expect, it, vi } from "vitest";
-
 import { buildStatusMessage } from "./status.js";
 
 afterEach(() => {
@@ -60,4 +62,55 @@ describe("buildStatusMessage", () => {
     expect(text).toContain("Context:");
     expect(text).toContain("Web: not linked");
   });
+
+  it("prefers cached prompt tokens from the session log", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "clawdis-status-"));
+    const storePath = path.join(dir, "sessions.json");
+    const sessionId = "sess-1";
+    const logPath = path.join(dir, `${sessionId}.jsonl`);
+
+    fs.writeFileSync(
+      logPath,
+      [
+        JSON.stringify({
+          type: "message",
+          message: {
+            role: "assistant",
+            model: "claude-opus-4-5",
+            usage: {
+              input: 1,
+              output: 2,
+              cacheRead: 1000,
+              cacheWrite: 0,
+              totalTokens: 1003,
+            },
+          },
+        }),
+      ].join("\n"),
+      "utf-8",
+    );
+
+    const text = buildStatusMessage({
+      reply: {
+        mode: "command",
+        command: ["echo", "{{Body}}"],
+        agent: { kind: "pi", model: "claude-opus-4-5", contextTokens: 32_000 },
+        session: { scope: "per-sender" },
+      },
+      sessionEntry: {
+        sessionId,
+        updatedAt: 0,
+        totalTokens: 3, // would be wrong if cached prompt tokens exist
+        contextTokens: 32_000,
+      },
+      sessionKey: "main",
+      sessionScope: "per-sender",
+      storePath,
+      webLinked: true,
+    });
+
+    expect(text).toContain("Context: 1.0k/32k");
+
+    fs.rmSync(dir, { recursive: true, force: true });
+  });
 });