diff --git a/codex-rs/app-server-protocol/src/protocol/v2.rs b/codex-rs/app-server-protocol/src/protocol/v2.rs
index 7beb5687dc..88b6b9f083 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2.rs
@@ -247,6 +247,9 @@ pub struct ThreadListParams {
     pub limit: Option<i32>,
     /// Optional sort order; defaults to descending.
     pub order: Option<SortOrder>,
+    /// Optional provider filter; when set, only sessions recorded under these
+    /// providers are returned. When present but empty, includes all providers.
+    pub model_providers: Option<Vec<String>>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]
diff --git a/codex-rs/app-server/src/codex_message_processor.rs b/codex-rs/app-server/src/codex_message_processor.rs
index 7691ea6d5d..f53b5eab90 100644
--- a/codex-rs/app-server/src/codex_message_processor.rs
+++ b/codex-rs/app-server/src/codex_message_processor.rs
@@ -1115,6 +1115,7 @@ impl CodexMessageProcessor {
             cursor,
             limit,
             order: _,
+            model_providers,
         } = params;
 
         let page_size = limit.unwrap_or(25).max(1) as usize;
@@ -1126,8 +1127,13 @@ impl CodexMessageProcessor {
         };
         let cursor_ref = cursor_obj.as_ref();
 
-        // v2 API does not filter by provider unless specified; include all.
-        let model_provider_slice: Option<&[String]> = None;
+        // v2: include all providers by default; if provided, honor non-empty filters.
+        let model_provider_vec = match model_providers {
+            Some(v) if v.is_empty() => None,
+            Some(v) => Some(v),
+            None => None,
+        };
+        let model_provider_slice = model_provider_vec.as_deref();
         let fallback_provider = self.config.model_provider_id.clone();
 
         let page = match RolloutRecorder::list_conversations(
diff --git a/codex-rs/app-server/tests/suite/v2/thread_list.rs b/codex-rs/app-server/tests/suite/v2/thread_list.rs
index fd7858b2e7..b2ccbcb88c 100644
--- a/codex-rs/app-server/tests/suite/v2/thread_list.rs
+++ b/codex-rs/app-server/tests/suite/v2/thread_list.rs
@@ -26,6 +26,7 @@ async fn thread_list_basic_empty() -> Result<()> {
             cursor: None,
             limit: Some(10),
             order: None,
+            model_providers: None,
         })
         .await?;
     let list_resp: JSONRPCResponse = timeout(
@@ -140,6 +141,7 @@ async fn thread_list_pagination_next_cursor_none_on_last_page() -> Result<()> {
             cursor: None,
             limit: Some(2),
             order: None,
+            model_providers: None,
         })
         .await?;
     let page1_resp: JSONRPCResponse = timeout(
@@ -160,6 +162,7 @@ async fn thread_list_pagination_next_cursor_none_on_last_page() -> Result<()> {
             cursor: Some(cursor1),
             limit: Some(2),
             order: None,
+            model_providers: None,
         })
         .await?;
     let page2_resp: JSONRPCResponse = timeout(
@@ -179,3 +182,77 @@ async fn thread_list_pagination_next_cursor_none_on_last_page() -> Result<()> {
 
     Ok(())
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn thread_list_respects_provider_filter() -> Result<()> {
+    let codex_home = TempDir::new()?;
+    create_minimal_config(codex_home.path())?;
+
+    // Create rollouts under two providers.
+    let _a = create_fake_rollout(
+        codex_home.path(),
+        "2025-01-02T10-00-00",
+        "2025-01-02T10:00:00Z",
+    )?; // mock_provider
+    // one with a different provider
+    let uuid = Uuid::new_v4();
+    let dir = codex_home
+        .path()
+        .join("sessions")
+        .join("2025")
+        .join("01")
+        .join("02");
+    std::fs::create_dir_all(&dir)?;
+    let file_path = dir.join(format!("rollout-2025-01-02T11-00-00-{uuid}.jsonl"));
+    let lines = [json!({
+            "timestamp": "2025-01-02T11:00:00Z",
+            "type": "session_meta",
+            "payload": {
+                "id": uuid,
+                "timestamp": "2025-01-02T11:00:00Z",
+                "cwd": "/",
+                "originator": "codex",
+                "cli_version": "0.0.0",
+                "instructions": null,
+                "source": "vscode",
+                "model_provider": "other_provider"
+            }
+        })
+        .to_string(),
+        json!({
+            "timestamp": "2025-01-02T11:00:00Z",
+            "type":"response_item",
+            "payload": {"type":"message","role":"user","content":[{"type":"input_text","text":"X"}]}
+        })
+        .to_string(),
+        json!({
+            "timestamp": "2025-01-02T11:00:00Z",
+            "type":"event_msg",
+            "payload": {"type":"user_message","message":"X","kind":"plain"}
+        })
+        .to_string()];
+    std::fs::write(file_path, lines.join("\n") + "\n")?;
+
+    let mut mcp = McpProcess::new(codex_home.path()).await?;
+    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
+
+    // Filter to only other_provider; expect 1 item, nextCursor None.
+    let list_id = mcp
+        .send_thread_list_request(ThreadListParams {
+            cursor: None,
+            limit: Some(10),
+            order: None,
+            model_providers: Some(vec!["other_provider".to_string()]),
+        })
+        .await?;
+    let resp: JSONRPCResponse = timeout(
+        DEFAULT_READ_TIMEOUT,
+        mcp.read_stream_until_response_message(RequestId::Integer(list_id)),
+    )
+    .await??;
+    let ThreadListResponse { data, next_cursor } = to_response::<ThreadListResponse>(resp)?;
+    assert_eq!(data.len(), 1);
+    assert!(next_cursor.is_none());
+
+    Ok(())
+}