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[codex] Emit MCP tool calls as turn items (#20677)

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## Why

`McpToolCall` was still an app-server item synthesized from deprecated
legacy begin/end events. Recent item migrations moved this ownership
into core `TurnItem`s, so MCP tool calls now follow the same canonical
lifecycle and leave legacy events as compatibility fanout.

Keeping the core item close to the v2 `ThreadItem::McpToolCall` shape
also avoids spreading MCP result semantics across app-server conversion
code. Core now owns whether a completed call is `completed` or `failed`,
and whether the payload is a tool result or an error.

## What changed

- Added core `TurnItem::McpToolCall` with flattened `server`, `tool`,
`arguments`, `status`, `result`, and `error` fields.
- Updated MCP tool call emitters, including MCP resource tools, to emit
`ItemStarted`/`ItemCompleted` around directly constructed core MCP
items.
- Updated app-server v2 conversion to project the core MCP item into
`ThreadItem::McpToolCall` without deriving status or splitting `Result`
locally.
- Ignored live deprecated MCP legacy fanout in app-server v2 to avoid
duplicate item notifications, while keeping thread history replay on the
legacy event path.

## Verification

- `cargo test -p codex-protocol`
- `cargo test -p codex-app-server-protocol`
- `cargo test -p codex-core --lib mcp_tool_call`
- `cargo check -p codex-app-server`
- `cargo test -p codex-app-server
mcp_tool_call_completion_notification_contains_truncated_large_result`
This commit is contained in:
pakrym-oai
2026-05-03 22:50:13 -07:00
committed by GitHub
Unverified
parent 9ddfda9db7
commit c8c30d9d75
8 changed files with 431 additions and 299 deletions
Download Patch File Download Diff File Expand all files Collapse all files
codex-rs/app-server-protocol/src/protocol/event_mapping.rs
-241
View File
@@ -12,9 +12,6 @@ use crate::protocol::v2::DynamicToolCallStatus;
use crate::protocol::v2::FileChangePatchUpdatedNotification;
use crate::protocol::v2::ItemCompletedNotification;
use crate::protocol::v2::ItemStartedNotification;
use crate::protocol::v2::McpToolCallError;
use crate::protocol::v2::McpToolCallResult;
use crate::protocol::v2::McpToolCallStatus;
use crate::protocol::v2::PlanDeltaNotification;
use crate::protocol::v2::ReasoningSummaryPartAddedNotification;
use crate::protocol::v2::ReasoningSummaryTextDeltaNotification;
@@ -23,7 +20,6 @@ use crate::protocol::v2::TerminalInteractionNotification;
use crate::protocol::v2::ThreadItem;
use codex_protocol::dynamic_tools::DynamicToolCallOutputContentItem as CoreDynamicToolCallOutputContentItem;
use codex_protocol::protocol::EventMsg;
use serde_json::Value as JsonValue;
use std::collections::HashMap;
/// Build the v2 app-server notification that directly corresponds to a single core event.
@@ -75,64 +71,6 @@ pub fn item_event_to_server_notification(
item,
})
}
EventMsg::McpToolCallBegin(begin_event) => {
let item = ThreadItem::McpToolCall {
id: begin_event.call_id,
server: begin_event.invocation.server,
tool: begin_event.invocation.tool,
status: McpToolCallStatus::InProgress,
arguments: begin_event.invocation.arguments.unwrap_or(JsonValue::Null),
mcp_app_resource_uri: begin_event.mcp_app_resource_uri,
result: None,
error: None,
duration_ms: None,
};
ServerNotification::ItemStarted(ItemStartedNotification {
thread_id,
turn_id,
item,
})
}
EventMsg::McpToolCallEnd(end_event) => {
let status = if end_event.is_success() {
McpToolCallStatus::Completed
} else {
McpToolCallStatus::Failed
};
let duration_ms = i64::try_from(end_event.duration.as_millis()).ok();
let (result, error) = match &end_event.result {
Ok(value) => (
Some(Box::new(McpToolCallResult {
content: value.content.clone(),
structured_content: value.structured_content.clone(),
meta: value.meta.clone(),
})),
None,
),
Err(message) => (
None,
Some(McpToolCallError {
message: message.clone(),
}),
),
};
let item = ThreadItem::McpToolCall {
id: end_event.call_id,
server: end_event.invocation.server,
tool: end_event.invocation.tool,
status,
arguments: end_event.invocation.arguments.unwrap_or(JsonValue::Null),
mcp_app_resource_uri: end_event.mcp_app_resource_uri,
result,
error,
duration_ms,
};
ServerNotification::ItemCompleted(ItemCompletedNotification {
thread_id,
turn_id,
item,
})
}
EventMsg::CollabAgentSpawnBegin(begin_event) => {
let item = ThreadItem::CollabAgentToolCall {
id: begin_event.call_id,
@@ -500,17 +438,11 @@ pub fn item_event_to_server_notification(
mod tests {
use super::*;
use codex_protocol::ThreadId;
use codex_protocol::mcp::CallToolResult;
use codex_protocol::protocol::CollabResumeBeginEvent;
use codex_protocol::protocol::CollabResumeEndEvent;
use codex_protocol::protocol::ExecCommandOutputDeltaEvent;
use codex_protocol::protocol::ExecOutputStream;
use codex_protocol::protocol::McpInvocation;
use codex_protocol::protocol::McpToolCallBeginEvent;
use codex_protocol::protocol::McpToolCallEndEvent;
use pretty_assertions::assert_eq;
use rmcp::model::Content;
use std::time::Duration;
fn assert_item_started_server_notification(
notification: ServerNotification,
@@ -621,179 +553,6 @@ mod tests {
);
}
#[test]
fn mcp_tool_call_begin_maps_to_item_started_notification_with_args() {
let begin_event = McpToolCallBeginEvent {
call_id: "call_123".to_string(),
invocation: McpInvocation {
server: "codex".to_string(),
tool: "list_mcp_resources".to_string(),
arguments: Some(serde_json::json!({"server": ""})),
},
mcp_app_resource_uri: Some("ui://widget/list-resources.html".to_string()),
};
let notification = item_event_to_server_notification(
EventMsg::McpToolCallBegin(begin_event.clone()),
"thread-1",
"turn_1",
);
assert_item_started_server_notification(
notification,
ItemStartedNotification {
thread_id: "thread-1".to_string(),
turn_id: "turn_1".to_string(),
item: ThreadItem::McpToolCall {
id: begin_event.call_id,
server: begin_event.invocation.server,
tool: begin_event.invocation.tool,
status: McpToolCallStatus::InProgress,
arguments: serde_json::json!({"server": ""}),
mcp_app_resource_uri: Some("ui://widget/list-resources.html".to_string()),
result: None,
error: None,
duration_ms: None,
},
},
);
}
#[test]
fn mcp_tool_call_begin_maps_to_item_started_notification_without_args() {
let begin_event = McpToolCallBeginEvent {
call_id: "call_456".to_string(),
invocation: McpInvocation {
server: "codex".to_string(),
tool: "list_mcp_resources".to_string(),
arguments: None,
},
mcp_app_resource_uri: None,
};
let notification = item_event_to_server_notification(
EventMsg::McpToolCallBegin(begin_event.clone()),
"thread-2",
"turn_2",
);
assert_item_started_server_notification(
notification,
ItemStartedNotification {
thread_id: "thread-2".to_string(),
turn_id: "turn_2".to_string(),
item: ThreadItem::McpToolCall {
id: begin_event.call_id,
server: begin_event.invocation.server,
tool: begin_event.invocation.tool,
status: McpToolCallStatus::InProgress,
arguments: JsonValue::Null,
mcp_app_resource_uri: None,
result: None,
error: None,
duration_ms: None,
},
},
);
}
#[test]
fn mcp_tool_call_end_maps_to_item_completed_notification_on_success() {
let content = vec![
serde_json::to_value(Content::text("{\"resources\":[]}"))
.expect("content should serialize"),
];
let result = CallToolResult {
content: content.clone(),
is_error: Some(false),
structured_content: None,
meta: Some(serde_json::json!({
"ui/resourceUri": "ui://widget/list-resources.html"
})),
};
let end_event = McpToolCallEndEvent {
call_id: "call_789".to_string(),
invocation: McpInvocation {
server: "codex".to_string(),
tool: "list_mcp_resources".to_string(),
arguments: Some(serde_json::json!({"server": ""})),
},
mcp_app_resource_uri: Some("ui://widget/list-resources.html".to_string()),
duration: Duration::from_nanos(92708),
result: Ok(result),
};
let notification = item_event_to_server_notification(
EventMsg::McpToolCallEnd(end_event.clone()),
"thread-3",
"turn_3",
);
assert_item_completed_server_notification(
notification,
ItemCompletedNotification {
thread_id: "thread-3".to_string(),
turn_id: "turn_3".to_string(),
item: ThreadItem::McpToolCall {
id: end_event.call_id,
server: end_event.invocation.server,
tool: end_event.invocation.tool,
status: McpToolCallStatus::Completed,
arguments: serde_json::json!({"server": ""}),
mcp_app_resource_uri: Some("ui://widget/list-resources.html".to_string()),
result: Some(Box::new(McpToolCallResult {
content,
structured_content: None,
meta: Some(serde_json::json!({
"ui/resourceUri": "ui://widget/list-resources.html"
})),
})),
error: None,
duration_ms: Some(0),
},
},
);
}
#[test]
fn mcp_tool_call_end_maps_to_item_completed_notification_on_error() {
let end_event = McpToolCallEndEvent {
call_id: "call_err".to_string(),
invocation: McpInvocation {
server: "codex".to_string(),
tool: "list_mcp_resources".to_string(),
arguments: None,
},
mcp_app_resource_uri: None,
duration: Duration::from_millis(1),
result: Err("boom".to_string()),
};
let notification = item_event_to_server_notification(
EventMsg::McpToolCallEnd(end_event.clone()),
"thread-4",
"turn_4",
);
assert_item_completed_server_notification(
notification,
ItemCompletedNotification {
thread_id: "thread-4".to_string(),
turn_id: "turn_4".to_string(),
item: ThreadItem::McpToolCall {
id: end_event.call_id,
server: end_event.invocation.server,
tool: end_event.invocation.tool,
status: McpToolCallStatus::Failed,
arguments: JsonValue::Null,
mcp_app_resource_uri: None,
result: None,
error: Some(McpToolCallError {
message: "boom".to_string(),
}),
duration_ms: Some(1),
},
},
);
}
#[test]
fn exec_command_output_delta_maps_to_command_execution_output_delta() {
let notification = item_event_to_server_notification(