diff --git a/src/adapters/openai-responses.ts b/src/adapters/openai-responses.ts
index 2900fd58b2..4d974cc527 100644
--- a/src/adapters/openai-responses.ts
+++ b/src/adapters/openai-responses.ts
@@ -2458,7 +2458,9 @@ export function createResponsesPassthroughAdapter(provider: OcxProviderConfig):
         // Last, so promoted namespace children are also cleared of Codex-private fields.
         outBody = stripCanonicalOnlyToolFields(outBody, provider.supportsOpenAiWebSearchToolFields === false);
       }
-      if (!forward) outBody = normalizeOpenCodeGoAdditionalTools(outBody, url);
+      if (!forward) {
+        outBody = normalizeOpenCodeGoAdditionalTools(outBody, url, parsed._replayPrefixLen);
+      }
       // Same predicate as the routedCompaction gate in handleResponses(): an authMode check would
       // let a noncanonical custom forward provider skip this rewrite while the server still routes
       // it as a summarizer turn (#422). The compaction body build removes the tool surface and must
diff --git a/src/adapters/opencode-go-additional-tools.ts b/src/adapters/opencode-go-additional-tools.ts
index 35e3aaa3e4..7e3609c134 100644
--- a/src/adapters/opencode-go-additional-tools.ts
+++ b/src/adapters/opencode-go-additional-tools.ts
@@ -3,7 +3,11 @@ function isRecord(value: unknown): value is Record<string, unknown> {
 }
 
 /** Console Go accepts public tools but rejects the private additional_tools input wrapper. */
-export function normalizeOpenCodeGoAdditionalTools(body: unknown, responseUrl: string): unknown {
+export function normalizeOpenCodeGoAdditionalTools(
+  body: unknown,
+  responseUrl: string,
+  replayPrefixLength = 0,
+): unknown {
   let destination: URL;
   try {
     destination = new URL(responseUrl);
@@ -20,10 +24,16 @@ export function normalizeOpenCodeGoAdditionalTools(body: unknown, responseUrl: s
 
   const input: unknown[] = [];
   const promoted: unknown[] = [];
+  const currentTurnStart = Number.isFinite(replayPrefixLength)
+    ? Math.min(body.input.length, Math.max(0, Math.trunc(replayPrefixLength)))
+    : 0;
   let changed = false;
-  for (const item of body.input) {
+  for (const [index, item] of body.input.entries()) {
     if (isRecord(item) && item.type === "additional_tools" && Array.isArray(item.tools)) {
       changed = true;
+      // Replayed wrappers are conversation history, not authority for the current request.
+      // Go cannot accept the wrapper itself, so remove it without promoting its catalog.
+      if (index < currentTurnStart) continue;
       // Custom/search/namespace lowering already owns identity and deduplication. This pass
       // only moves declarations, including hosted tools that intentionally have no name.
       for (const tool of item.tools) promoted.push(tool);
diff --git a/tests/providers/opencode-go-grok46-responses.test.ts b/tests/providers/opencode-go-grok46-responses.test.ts
index d35fa6cf8c..cadea0a9b5 100644
--- a/tests/providers/opencode-go-grok46-responses.test.ts
+++ b/tests/providers/opencode-go-grok46-responses.test.ts
@@ -26,6 +26,7 @@ function buildRequest(
   modelId: string,
   rawBody: Record<string, unknown>,
   configuredProvider = provider(),
+  replayPrefixLength?: number,
 ) {
   return createResponsesPassthroughAdapter(configuredProvider).buildRequest({
     modelId,
@@ -33,6 +34,7 @@ function buildRequest(
     stream: true,
     options: {},
     _rawBody: { model: modelId, input: "ping", ...rawBody },
+    ...(replayPrefixLength === undefined ? {} : { _replayPrefixLen: replayPrefixLength }),
   }, { headers: new Headers() });
 }
 
@@ -201,6 +203,26 @@ describe("OpenCode Go additional_tools placement", () => {
       .toMatchObject({ input: [], tools: [], tool_choice: "none" });
   });
 
+  test("does not promote additional tools restored from continuation history", () => {
+    const historicalWeb = { type: "web_search" };
+    const request = buildRequest("gpt-5.6-luna", {
+      tools: [],
+      input: [
+        { type: "additional_tools", tools: [historicalWeb] },
+        { type: "message", role: "assistant", content: "history" },
+        { type: "message", role: "user", content: "continue" },
+      ],
+    }, provider(), 2);
+
+    expect(JSON.parse(request.body)).toMatchObject({
+      input: [
+        { type: "message", role: "assistant", content: "history" },
+        { type: "message", role: "user", content: "continue" },
+      ],
+      tools: [],
+    });
+  });
+
   test("activates tools loaded by tool search before moving their catalog", () => {
     const sent = build("gpt-5.6-luna", { input: [
       { type: "additional_tools", tools: [{ ...lookup, defer_loading: true }] },