diff --git a/codex-rs/app-server-protocol/schema/json/ServerNotification.json b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
index 116844171..d7619354f 100644
--- a/codex-rs/app-server-protocol/schema/json/ServerNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/ServerNotification.json
@@ -1736,6 +1736,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
index 80f2b226b..09f0daefd 100644
--- a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
+++ b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json
@@ -9184,6 +9184,7 @@
       },
       "McpToolCallResult": {
         "properties": {
+          "_meta": true,
           "content": {
             "items": true,
             "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
index eb4e9d7b1..620495f8b 100644
--- a/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
+++ b/codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json
@@ -6007,6 +6007,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ItemCompletedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/ItemCompletedNotification.json
index 396410786..2883670c8 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ItemCompletedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ItemCompletedNotification.json
@@ -294,6 +294,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ItemStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/ItemStartedNotification.json
index abb8aee5d..c2e71ccba 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ItemStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ItemStartedNotification.json
@@ -294,6 +294,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
index 4bdeebf57..a7fe2e8d6 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ReviewStartResponse.json
@@ -430,6 +430,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
index a79ac103c..9b1870198 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadForkResponse.json
@@ -518,6 +518,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
index e8211b252..426f34ce3 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
index 08c4696bb..c869a7974 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadMetadataUpdateResponse.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
index f6d67d5c0..9569860c3 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
index 169743504..5143545ec 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadResumeResponse.json
@@ -518,6 +518,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
index e664490df..502dd3961 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadRollbackResponse.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
index 98e022c75..c07b4d825 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartResponse.json
@@ -518,6 +518,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
index f640c4096..ff87af206 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadStartedNotification.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
index 1c10ea3b8..daf821c37 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/ThreadUnarchiveResponse.json
@@ -456,6 +456,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
index fc1deb675..82c2b3c76 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnCompletedNotification.json
@@ -430,6 +430,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json b/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
index 5b79f4df1..ebb2065cb 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnStartResponse.json
@@ -430,6 +430,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json b/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
index ccbe93e9c..8b7c2bc41 100644
--- a/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
+++ b/codex-rs/app-server-protocol/schema/json/v2/TurnStartedNotification.json
@@ -430,6 +430,7 @@
     },
     "McpToolCallResult": {
       "properties": {
+        "_meta": true,
         "content": {
           "items": true,
           "type": "array"
diff --git a/codex-rs/app-server-protocol/schema/typescript/v2/McpToolCallResult.ts b/codex-rs/app-server-protocol/schema/typescript/v2/McpToolCallResult.ts
index f493a8609..916a5f5bb 100644
--- a/codex-rs/app-server-protocol/schema/typescript/v2/McpToolCallResult.ts
+++ b/codex-rs/app-server-protocol/schema/typescript/v2/McpToolCallResult.ts
@@ -3,4 +3,4 @@
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 import type { JsonValue } from "../serde_json/JsonValue";
 
-export type McpToolCallResult = { content: Array<JsonValue>, structuredContent: JsonValue | null, };
+export type McpToolCallResult = { content: Array<JsonValue>, structuredContent: JsonValue | null, _meta: JsonValue | null, };
diff --git a/codex-rs/app-server-protocol/src/protocol/thread_history.rs b/codex-rs/app-server-protocol/src/protocol/thread_history.rs
index 10d55bb23..27d393629 100644
--- a/codex-rs/app-server-protocol/src/protocol/thread_history.rs
+++ b/codex-rs/app-server-protocol/src/protocol/thread_history.rs
@@ -520,6 +520,7 @@ impl ThreadHistoryBuilder {
                 Some(McpToolCallResult {
                     content: value.content.clone(),
                     structured_content: value.structured_content.clone(),
+                    meta: value.meta.clone(),
                 }),
                 None,
             ),
@@ -1167,6 +1168,7 @@ mod tests {
     use codex_protocol::items::TurnItem as CoreTurnItem;
     use codex_protocol::items::UserMessageItem as CoreUserMessageItem;
     use codex_protocol::items::build_hook_prompt_message;
+    use codex_protocol::mcp::CallToolResult;
     use codex_protocol::models::MessagePhase as CoreMessagePhase;
     use codex_protocol::models::WebSearchAction as CoreWebSearchAction;
     use codex_protocol::parse_command::ParsedCommand;
@@ -1861,6 +1863,67 @@ mod tests {
         );
     }
 
+    #[test]
+    fn reconstructs_mcp_tool_result_meta_from_persisted_completion_events() {
+        let events = vec![
+            EventMsg::TurnStarted(TurnStartedEvent {
+                turn_id: "turn-1".into(),
+                started_at: None,
+                model_context_window: None,
+                collaboration_mode_kind: Default::default(),
+            }),
+            EventMsg::McpToolCallEnd(McpToolCallEndEvent {
+                call_id: "mcp-1".into(),
+                invocation: McpInvocation {
+                    server: "docs".into(),
+                    tool: "lookup".into(),
+                    arguments: Some(serde_json::json!({"id":"123"})),
+                },
+                duration: Duration::from_millis(8),
+                result: Ok(CallToolResult {
+                    content: vec![serde_json::json!({
+                        "type": "text",
+                        "text": "result"
+                    })],
+                    structured_content: Some(serde_json::json!({"id":"123"})),
+                    is_error: Some(false),
+                    meta: Some(serde_json::json!({
+                        "ui/resourceUri": "ui://widget/lookup.html"
+                    })),
+                }),
+            }),
+        ];
+
+        let items = events
+            .into_iter()
+            .map(RolloutItem::EventMsg)
+            .collect::<Vec<_>>();
+        let turns = build_turns_from_rollout_items(&items);
+        assert_eq!(turns.len(), 1);
+        assert_eq!(
+            turns[0].items[0],
+            ThreadItem::McpToolCall {
+                id: "mcp-1".into(),
+                server: "docs".into(),
+                tool: "lookup".into(),
+                status: McpToolCallStatus::Completed,
+                arguments: serde_json::json!({"id":"123"}),
+                result: Some(McpToolCallResult {
+                    content: vec![serde_json::json!({
+                        "type": "text",
+                        "text": "result"
+                    })],
+                    structured_content: Some(serde_json::json!({"id":"123"})),
+                    meta: Some(serde_json::json!({
+                        "ui/resourceUri": "ui://widget/lookup.html"
+                    })),
+                }),
+                error: None,
+                duration_ms: Some(8),
+            }
+        );
+    }
+
     #[test]
     fn reconstructs_dynamic_tool_items_from_request_and_response_events() {
         let events = vec![
diff --git a/codex-rs/app-server-protocol/src/protocol/v2.rs b/codex-rs/app-server-protocol/src/protocol/v2.rs
index 3562d9cda..296baa1fe 100644
--- a/codex-rs/app-server-protocol/src/protocol/v2.rs
+++ b/codex-rs/app-server-protocol/src/protocol/v2.rs
@@ -5048,6 +5048,9 @@ pub struct McpToolCallResult {
     // representations). Using `JsonValue` keeps the payload wire-shaped and easy to export.
     pub content: Vec<JsonValue>,
     pub structured_content: Option<JsonValue>,
+    #[serde(rename = "_meta")]
+    #[ts(rename = "_meta")]
+    pub meta: Option<JsonValue>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]
diff --git a/codex-rs/app-server/src/bespoke_event_handling.rs b/codex-rs/app-server/src/bespoke_event_handling.rs
index 141ee78bd..f5c60fe9d 100644
--- a/codex-rs/app-server/src/bespoke_event_handling.rs
+++ b/codex-rs/app-server/src/bespoke_event_handling.rs
@@ -2843,6 +2843,7 @@ async fn construct_mcp_tool_call_end_notification(
             Some(McpToolCallResult {
                 content: value.content.clone(),
                 structured_content: value.structured_content.clone(),
+                meta: value.meta.clone(),
             }),
             None,
         ),
@@ -4233,7 +4234,9 @@ mod tests {
             content: content.clone(),
             is_error: Some(false),
             structured_content: None,
-            meta: None,
+            meta: Some(serde_json::json!({
+                "ui/resourceUri": "ui://widget/list-resources.html"
+            })),
         };
 
         let end_event = McpToolCallEndEvent {
@@ -4268,6 +4271,9 @@ mod tests {
                 result: Some(McpToolCallResult {
                     content,
                     structured_content: None,
+                    meta: Some(serde_json::json!({
+                        "ui/resourceUri": "ui://widget/list-resources.html"
+                    })),
                 }),
                 error: None,
                 duration_ms: Some(0),
diff --git a/codex-rs/exec/tests/event_processor_with_json_output.rs b/codex-rs/exec/tests/event_processor_with_json_output.rs
index a6b25b66b..bb2936656 100644
--- a/codex-rs/exec/tests/event_processor_with_json_output.rs
+++ b/codex-rs/exec/tests/event_processor_with_json_output.rs
@@ -482,6 +482,7 @@ fn mcp_tool_call_begin_and_end_emit_item_events() {
                 result: Some(McpToolCallResult {
                     content: Vec::new(),
                     structured_content: None,
+                    meta: None,
                 }),
                 error: None,
                 duration_ms: Some(1_000),
@@ -613,6 +614,7 @@ fn mcp_tool_call_defaults_arguments_and_preserves_structured_content() {
                         "text": "done",
                     })],
                     structured_content: Some(json!({ "status": "ok" })),
+                    meta: None,
                 }),
                 error: None,
                 duration_ms: Some(10),