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Route standalone image generation through host finalization md (#25176)

Browse Source 
## Why

Standalone image-generation extensions emitted turn items through the
low-level event path, bypassing host-owned finalization such as image
persistence and contributor processing. At the same time, the
generated-image save-path hint must remain visible to the model through
the extension tool's `FunctionCallOutput`, rather than the legacy
built-in developer-message path.

## What changed

- Extended `ExtensionTurnItem` to support image-generation items while
keeping the extension-facing emitter API limited to `emit_started` and
`emit_completed`.
- Routed extension completion through core `finalize_turn_item`, so
standalone image-generation items receive host-owned processing and
persisted `saved_path` values before publication.
- Kept legacy built-in image generation on its existing
developer-message hint path, while standalone image generation returns
its deterministic saved-path hint in `FunctionCallOutput`.
- Shared the image artifact path and output-hint formatting used by core
and the image-generation extension.
- Passed thread identity through extension tool calls so standalone
image generation can construct the same intended artifact path as core.
- Added an app-server integration test covering real standalone image
generation, saved artifact publication, model-visible output hint
wiring, and absence of the legacy developer-message hint.

## Validation

- `just fmt`
- `just test -p codex-image-generation-extension`
- `just test -p codex-web-search-extension`
- `just test -p codex-goal-extension`
- `just test -p codex-memories-extension`
- Targeted `codex-core` tests for image save history, extension
completion finalization, and contributor execution
- `just test -p codex-app-server
standalone_image_generation_returns_saved_path_hint_to_model`
- `just fix -p codex-core`
- `just fix -p codex-image-generation-extension`
- `just bazel-lock-update`
- `just bazel-lock-check`
This commit is contained in:
Won Park
2026-06-02 12:00:04 -07:00
committed by GitHub
Unverified
parent e29071e4c9
commit 57f337a8e9
9 changed files with 385 additions and 156 deletions
Download Patch File Download Diff File Expand all files Collapse all files
codex-rs/core/src/tools/handlers/extension_tools.rs
+93 -77
View File
@@ -4,7 +4,6 @@ use std::sync::Weak;
use codex_protocol::items::TurnItem;
use codex_tools::ConversationHistory;
use codex_tools::ExtensionTurnItem;
use codex_tools::ImageGenerationCompletionFuture;
use codex_tools::ToolCall as ExtensionToolCall;
use codex_tools::ToolName;
use codex_tools::ToolSearchInfo;
@@ -12,12 +11,11 @@ use codex_tools::ToolSpec;
use codex_tools::TurnItemEmissionFuture;
use codex_tools::TurnItemEmitter;
use crate::context::ContextualUserFragment;
use crate::context::ImageGenerationInstructions;
use crate::function_tool::FunctionCallError;
use crate::session::session::Session;
use crate::session::turn_context::TurnContext;
use crate::stream_events_utils::persist_image_generation_item;
use crate::stream_events_utils::TurnItemContributorPolicy;
use crate::stream_events_utils::finalize_turn_item;
use crate::tools::context::ToolInvocation;
use crate::tools::context::ToolOutput;
use crate::tools::context::ToolPayload;
@@ -76,6 +74,10 @@ struct CoreTurnItemEmitter {
fn extension_turn_item(item: ExtensionTurnItem) -> TurnItem {
match item {
ExtensionTurnItem::WebSearch(item) => TurnItem::WebSearch(item),
ExtensionTurnItem::ImageGeneration(mut item) => {
item.saved_path = None;
TurnItem::ImageGeneration(item)
}
}
}
@@ -85,8 +87,9 @@ impl TurnItemEmitter for CoreTurnItemEmitter {
let (Some(session), Some(turn)) = (self.session.upgrade(), self.turn.upgrade()) else {
return;
};
let item = extension_turn_item(item);
session.emit_turn_item_started(turn.as_ref(), &item).await;
session
.emit_turn_item_started(turn.as_ref(), &extension_turn_item(item))
.await;
})
}
@@ -95,54 +98,18 @@ impl TurnItemEmitter for CoreTurnItemEmitter {
let (Some(session), Some(turn)) = (self.session.upgrade(), self.turn.upgrade()) else {
return;
};
let item = extension_turn_item(item);
let mut item = extension_turn_item(item);
finalize_turn_item(
session.as_ref(),
turn.as_ref(),
TurnItemContributorPolicy::Run(turn.extension_data.as_ref()),
&mut item,
turn.collaboration_mode.mode == codex_protocol::config_types::ModeKind::Plan,
)
.await;
session.emit_turn_item_completed(turn.as_ref(), item).await;
})
}
fn image_generation_completed<'a>(
&'a self,
call_id: String,
prompt: String,
result: String,
) -> ImageGenerationCompletionFuture<'a> {
Box::pin(async move {
let (Some(session), Some(turn)) = (self.session.upgrade(), self.turn.upgrade()) else {
return None;
};
let mut item = codex_protocol::items::ImageGenerationItem {
id: call_id,
status: "completed".to_string(),
revised_prompt: Some(prompt),
result,
saved_path: None,
};
let output_hint =
persist_image_generation_item(session.as_ref(), turn.as_ref(), &mut item)
.await
.map(|saved_path| {
let output_dir = saved_path
.parent()
.unwrap_or_else(|| turn.config.codex_home.clone());
ImageGenerationInstructions::new(output_dir.display(), saved_path.display())
.body()
});
let started_item = codex_protocol::items::ImageGenerationItem {
id: item.id.clone(),
status: "in_progress".to_string(),
revised_prompt: None,
result: String::new(),
saved_path: None,
};
session
.emit_turn_item_started(turn.as_ref(), &TurnItem::ImageGeneration(started_item))
.await;
session
.emit_turn_item_completed(turn.as_ref(), TurnItem::ImageGeneration(item))
.await;
output_hint
})
}
}
async fn to_extension_call(invocation: &ToolInvocation) -> ExtensionToolCall {
@@ -167,6 +134,8 @@ async fn to_extension_call(invocation: &ToolInvocation) -> ExtensionToolCall {
mod tests {
use std::sync::Arc;
use codex_extension_api::ExtensionData;
use codex_extension_api::TurnItemContributor;
use codex_protocol::items::TurnItem;
use codex_protocol::items::WebSearchItem;
use codex_protocol::models::ContentItem;
@@ -174,10 +143,13 @@ mod tests {
use codex_protocol::models::WebSearchAction;
use codex_protocol::protocol::EventMsg;
use codex_tools::ExtensionTurnItem;
use codex_utils_absolute_path::test_support::PathExt;
use codex_utils_absolute_path::test_support::test_path_buf;
use pretty_assertions::assert_eq;
use serde_json::json;
use tokio::sync::Mutex;
use super::CoreTurnItemEmitter;
use super::ExtensionToolAdapter;
use crate::tools::context::ToolCallSource;
use crate::tools::context::ToolInvocation;
@@ -409,8 +381,54 @@ mod tests {
assert_eq!(end.action, expected.action);
}
struct ImageGenerationExtensionExecutor {
output_hint: Arc<Mutex<Option<String>>>,
struct ImageGenerationExtensionExecutor;
#[derive(Debug)]
struct ExtensionTurnItemContributorRan;
struct RecordExtensionTurnItemContributor;
#[async_trait::async_trait]
impl TurnItemContributor for RecordExtensionTurnItemContributor {
async fn contribute(
&self,
_thread_store: &ExtensionData,
turn_store: &ExtensionData,
_item: &mut TurnItem,
) -> Result<(), String> {
turn_store.insert(ExtensionTurnItemContributorRan);
Ok(())
}
}
#[tokio::test]
async fn extension_completion_runs_turn_item_contributors() {
let (mut session, turn) = crate::session::tests::make_session_and_context().await;
let mut builder = codex_extension_api::ExtensionRegistryBuilder::new();
builder.turn_item_contributor(Arc::new(RecordExtensionTurnItemContributor));
session.services.extensions = Arc::new(builder.build());
let session = Arc::new(session);
let turn = Arc::new(turn);
let emitter = CoreTurnItemEmitter {
session: Arc::downgrade(&session),
turn: Arc::downgrade(&turn),
};
codex_tools::TurnItemEmitter::emit_completed(
&emitter,
ExtensionTurnItem::WebSearch(WebSearchItem {
id: "search-1".to_string(),
query: "contributors".to_string(),
action: WebSearchAction::Other,
}),
)
.await;
assert!(
turn.extension_data
.get::<ExtensionTurnItemContributorRan>()
.is_some()
);
}
#[async_trait::async_trait]
@@ -434,15 +452,28 @@ mod tests {
&self,
call: codex_tools::ToolCall,
) -> Result<Box<dyn codex_tools::ToolOutput>, codex_tools::FunctionCallError> {
let output_hint = call
.turn_item_emitter
.image_generation_completed(
call.call_id,
"A tiny blue square".to_string(),
"cG5n".to_string(),
)
call.turn_item_emitter
.emit_started(ExtensionTurnItem::ImageGeneration(
codex_protocol::items::ImageGenerationItem {
id: call.call_id.clone(),
status: "in_progress".to_string(),
revised_prompt: None,
result: String::new(),
saved_path: None,
},
))
.await;
call.turn_item_emitter
.emit_completed(ExtensionTurnItem::ImageGeneration(
codex_protocol::items::ImageGenerationItem {
id: call.call_id,
status: "completed".to_string(),
revised_prompt: Some("A tiny blue square".to_string()),
result: "cG5n".to_string(),
saved_path: Some(test_path_buf("/tmp/extension-claimed.png").abs()),
},
))
.await;
*self.output_hint.lock().await = output_hint;
Ok(Box::new(codex_tools::JsonToolOutput::new(
json!({ "ok": true }),
)))
@@ -451,10 +482,7 @@ mod tests {
#[tokio::test]
async fn image_generation_publication_is_finalized_by_core() {
let output_hint = Arc::new(Mutex::new(None));
let handler = ExtensionToolAdapter::new(Arc::new(ImageGenerationExtensionExecutor {
output_hint: Arc::clone(&output_hint),
}));
let handler = ExtensionToolAdapter::new(Arc::new(ImageGenerationExtensionExecutor));
let (session, turn, rx) = crate::session::tests::make_session_and_context_with_rx().await;
let expected_path = crate::stream_events_utils::image_generation_artifact_path(
&turn.config.codex_home,
@@ -521,17 +549,5 @@ mod tests {
std::fs::read(&expected_path).expect("generated artifact should be saved"),
b"png"
);
assert_eq!(
*output_hint.lock().await,
Some(format!(
"Generated images are saved to {} as {} by default.\n\
If you need to use a generated image at another path, copy it and leave the original in place unless the user explicitly asks you to delete it.",
expected_path
.parent()
.expect("generated image path should have a parent")
.display(),
expected_path.display(),
))
);
}
}