diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server.rs
index bb509ec4d..670ecc567 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server.rs
@@ -2149,11 +2149,6 @@ impl CodexAppServerConnection {
                 .await
                 .map_err(platform_llm::LlmError::Transport)?;
             }
-            append_direct_project_history_item_at(
-                history_root,
-                &direct_project_user_message_item(current_prompt),
-            )
-            .map_err(platform_llm::LlmError::InvalidRequest)?;
         }
         let prompt = if self.inner.workspace_mode.uses_direct_conversation() {
             direct_codex_user_prompt(&request)
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_project_history.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_project_history.rs
index edad7c9c8..e51c425ae 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_project_history.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_project_history.rs
@@ -9,6 +9,28 @@ use std::io::{BufRead, BufReader, Read, Seek, SeekFrom};
 use std::path::{Path, PathBuf};
 
 const DIRECT_PROJECT_HISTORY_RECORD_TYPE: &str = "response_item";
+const DIRECT_PROJECT_INTERNAL_CONTEXT_KINDS: &[&str] = &[
+    "host_skills.instructions",
+    "permissions.instructions",
+    "environments.environment_context",
+];
+
+pub(crate) fn is_direct_project_internal_context_item(item: &Value) -> bool {
+    if matches!(
+        item.get("role").and_then(Value::as_str),
+        Some("developer" | "system")
+    ) {
+        return true;
+    }
+    item.pointer("/internal_chat_message_metadata_passthrough/content_item_kinds")
+        .and_then(Value::as_array)
+        .is_some_and(|kinds| {
+            kinds
+                .iter()
+                .filter_map(Value::as_str)
+                .any(|kind| DIRECT_PROJECT_INTERNAL_CONTEXT_KINDS.contains(&kind))
+        })
+}
 
 fn history_path(root: &Path) -> PathBuf {
     root.join(".agent/conversations/project.jsonl")
@@ -113,6 +135,9 @@ pub(crate) fn append_direct_project_history_item_at(
     item: &Value,
 ) -> Result<(), String> {
     enforce_project_permission_policy(root, "conversation.write")?;
+    if is_direct_project_internal_context_item(item) {
+        return Ok(());
+    }
     let _project_lock = crate::project::acquire_project_write_lock(root, "conversation.write")?;
     let path = history_path(root);
     prepare_game_creator_private_path_for_read(&path, false, "DirectProject 历史")?;
@@ -154,14 +179,6 @@ pub(crate) fn direct_project_local_message_item(
     Ok(item)
 }
 
-pub(crate) fn direct_project_user_message_item(prompt: &str) -> Value {
-    serde_json::json!({
-        "type": "message",
-        "role": "user",
-        "content": [{"type": "input_text", "text": prompt}],
-    })
-}
-
 pub(crate) fn read_direct_project_history_items_at(root: &Path) -> Result<Vec<Value>, String> {
     let path = history_path(root);
     if !prepare_game_creator_private_path_for_read(&path, false, "DirectProject 历史")? {
@@ -204,6 +221,9 @@ pub(crate) fn read_direct_project_history_items_at(root: &Path) -> Result<Vec<Va
             .get("payload")
             .cloned()
             .ok_or_else(|| format!("DirectProject 历史记录缺少 payload：{}", path.display()))?;
+        if is_direct_project_internal_context_item(&item) {
+            continue;
+        }
         items.push(item);
     }
     Ok(items)
@@ -249,3 +269,34 @@ pub(crate) fn read_direct_project_chat_history_at(
         messages,
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::is_direct_project_internal_context_item;
+    use serde_json::json;
+
+    #[test]
+    fn filters_host_context_but_keeps_real_user_items() {
+        assert!(is_direct_project_internal_context_item(&json!({
+            "type": "message",
+            "role": "developer",
+            "content": [{"type": "input_text", "text": "<skills_instructions>"}]
+        })));
+        assert!(is_direct_project_internal_context_item(&json!({
+            "type": "message",
+            "role": "user",
+            "content": [{"type": "input_text", "text": "<environment_context>"}],
+            "internal_chat_message_metadata_passthrough": {
+                "content_item_kinds": ["environments.environment_context"]
+            }
+        })));
+        assert!(!is_direct_project_internal_context_item(&json!({
+            "type": "message",
+            "role": "user",
+            "content": [{"type": "input_text", "text": "ls ui"}],
+            "internal_chat_message_metadata_passthrough": {
+                "content_item_kinds": ["user.text"]
+            }
+        })));
+    }
+}