diff --git a/packages/opencode/src/session/instruction.ts b/packages/opencode/src/session/instruction.ts
index 86f73d0fd238..526e3f4b1c00 100644
--- a/packages/opencode/src/session/instruction.ts
+++ b/packages/opencode/src/session/instruction.ts
@@ -13,7 +13,7 @@ const log = Log.create({ service: "instruction" })
 
 const FILES = [
   "AGENTS.md",
-  "CLAUDE.md",
+  ...(Flag.OPENCODE_DISABLE_CLAUDE_CODE_PROMPT ? [] : ["CLAUDE.md"]),
   "CONTEXT.md", // deprecated
 ]