diff --git a/src/probe-worker.mjs b/src/probe-worker.mjs
index 344e76a..5a836c9 100644
--- a/src/probe-worker.mjs
+++ b/src/probe-worker.mjs
@@ -167,17 +167,31 @@ export async function decideWithModel(probe, env) {
   }
 }
 
-async function publishReply(room, text, env) {
+export async function publishReply(room, text, env) {
   const nonce = Date.now();
   const sig = await signText(room, String(nonce), text, env.TECHNOCORE_AGENT_PRIVATE_KEY);
-  const response = await fetch(`${env.TECHNOCORE_URL || DEFAULT_BASE_URL}/r/${encodeURIComponent(room)}`, {
+  const baseUrl = env.TECHNOCORE_URL || DEFAULT_BASE_URL;
+  const response = await fetch(`${baseUrl}/r/${encodeURIComponent(room)}`, {
     method: "POST",
     headers: { "content-type": "application/json", accept: "application/json" },
     body: JSON.stringify({ did: env.TECHNOCORE_AGENT_DID, sig, nonce: String(nonce), text })
   });
   if (!response.ok) throw new Error(`Technocore publish failed: ${response.status}`);
-  const accepted = await response.json();
-  if (!accepted?.seq) throw new Error("Technocore did not confirm the reply");
+  await response.text();
+
+  // Successful Technocore writes return the room's plain-text view, even when
+  // the request advertises JSON. Confirm the exact signed record with a fresh
+  // machine-readable read instead of trying to parse the write response.
+  const confirmation = await readJson(
+    `${baseUrl}/r/${encodeURIComponent(room)}?limit=50&format=json&n=${nonce}`
+  );
+  const accepted = (confirmation?.messages || []).find((record) =>
+    record.from === env.TECHNOCORE_AGENT_DID
+      && String(record.nonce) === String(nonce)
+      && record.text === text
+      && record.sig === sig
+  );
+  if (!accepted?.seq) throw new Error("Technocore did not confirm the signed reply");
   return accepted.seq;
 }
 
diff --git a/tests/probe-worker.test.mjs b/tests/probe-worker.test.mjs
index 81c03e3..5f24b7e 100644
--- a/tests/probe-worker.test.mjs
+++ b/tests/probe-worker.test.mjs
@@ -8,6 +8,7 @@ import {
   parseProbe,
   parseProbeReply,
   probeAgeMs,
+  publishReply,
   validateProbeDecision,
   verifySignedRecord
 } from "../src/probe-worker.mjs";
@@ -162,6 +163,32 @@ test("hot-polls configured probe rooms with a sequence cursor", async () => {
   }
 });
 
+test("confirms a signed write after Technocore returns its plain-text room view", async () => {
+  const originalFetch = globalThis.fetch;
+  const pair = await crypto.subtle.generateKey({ name: "Ed25519" }, true, ["sign", "verify"]);
+  const privateKey = Buffer.from(await crypto.subtle.exportKey("pkcs8", pair.privateKey)).toString("base64");
+  let posted;
+  globalThis.fetch = async (_url, options) => {
+    if (options?.method === "POST") {
+      posted = JSON.parse(options.body);
+      return { ok: true, text: async () => "# room technocore\n" };
+    }
+    return {
+      ok: true,
+      json: async () => ({ messages: [{ seq: 42, from: posted.did, nonce: posted.nonce, text: posted.text, sig: posted.sig }] })
+    };
+  };
+  try {
+    assert.equal(await publishReply("technocore", "probe v1 reply | run.1 | ack | bounded answer citing run.1", {
+      TECHNOCORE_AGENT_DID: "did:key:z6MkTest",
+      TECHNOCORE_AGENT_PRIVATE_KEY: privateKey,
+      TECHNOCORE_URL: "https://technocore.chat"
+    }), 42);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
 test("accepts the official DID signature and rejects tampering", async () => {
   const pair = await crypto.subtle.generateKey({ name: "Ed25519" }, true, ["sign", "verify"]);
   const publicKey = new Uint8Array(await crypto.subtle.exportKey("raw", pair.publicKey));