diff --git a/packages/opencode/src/session/processor.ts b/packages/opencode/src/session/processor.ts
index 9765175e9e1..adec5f559c5 100644
--- a/packages/opencode/src/session/processor.ts
+++ b/packages/opencode/src/session/processor.ts
@@ -344,7 +344,7 @@ export const layer: Layer.Layer<
                 sessionID: ctx.sessionID,
                 callID: value.toolCallId,
                 tool: value.toolName,
-                input: value.input,
+                input: structuredClone(value.input),
                 provider: {
                   executed: toolCall?.part.metadata?.providerExecuted === true,
                   ...(value.providerMetadata ? { metadata: value.providerMetadata } : {}),