bamboo-server 2026.9.20

HTTP server and API layer for the Bamboo agent framework
Documentation
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use super::response::execute_response_payload;
use super::validation::validate_and_normalize_model;
use crate::handlers::agent::execute::{ExecuteClientSync, ExecuteSyncInfo, ExecuteSyncReason};

use bamboo_engine::session_app::types::ServerExecuteSnapshot;

use super::resolve_requested_provider;

fn evaluate_client_sync_adapter(
    client_sync: Option<&ExecuteClientSync>,
    server_snapshot: &ServerExecuteSnapshot,
) -> Option<ExecuteSyncReason> {
    let crate_sync = client_sync.map(|cs| bamboo_engine::session_app::types::ExecuteClientSync {
        client_message_count: cs.client_message_count,
        client_last_message_id: cs.client_last_message_id.clone(),
        client_has_pending_question: cs.client_has_pending_question,
        client_pending_question_tool_call_id: cs.client_pending_question_tool_call_id.clone(),
    });

    bamboo_engine::session_app::execute::evaluate_client_sync(crate_sync.as_ref(), server_snapshot)
        .map(|reason| match reason {
            bamboo_engine::session_app::types::ExecuteSyncReason::PendingQuestionMismatch => {
                ExecuteSyncReason::PendingQuestionMismatch
            }
            bamboo_engine::session_app::types::ExecuteSyncReason::MessageCountMismatch => {
                ExecuteSyncReason::MessageCountMismatch
            }
            bamboo_engine::session_app::types::ExecuteSyncReason::LastMessageIdMismatch => {
                ExecuteSyncReason::LastMessageIdMismatch
            }
        })
}

#[test]
fn validate_and_normalize_model_treats_empty_value_as_absent() {
    assert_eq!(
        validate_and_normalize_model(Some("   ")).expect("empty model should normalize"),
        None
    );
}

#[test]
fn requested_provider_fallback_uses_default_provider_instance() {
    let mut config = bamboo_config::Config::default();
    let instance = serde_json::from_value(serde_json::json!({
        "provider_type": "openai",
        "enabled": true
    }))
    .unwrap();
    config.provider = "anthropic".to_string();
    config
        .provider_instances
        .insert("execute-openai".to_string(), instance);
    config.default_provider_instance = Some("execute-openai".to_string());

    assert_eq!(resolve_requested_provider(&config, None), "execute-openai");
    assert_eq!(
        resolve_requested_provider(&config, Some("explicit")),
        "explicit"
    );
}

#[test]
fn validate_and_normalize_model_trims_whitespace() {
    let model = validate_and_normalize_model(Some(" gpt-4o-mini ")).expect("model should be valid");
    assert_eq!(model.as_deref(), Some("gpt-4o-mini"));
}

#[test]
fn execute_response_payload_formats_status_and_events_url() {
    let payload = execute_response_payload(
        "session-123",
        "started",
        Some(ExecuteSyncInfo {
            need_sync: false,
            reason: None,
            server_message_count: 2,
            server_last_message_id: Some("msg-2".to_string()),
            has_pending_question: false,
            pending_question_tool_call_id: None,
            has_pending_user_message: true,
        }),
        None,
    );
    assert_eq!(payload.session_id, "session-123");
    assert_eq!(payload.status, "started");
    assert_eq!(payload.events_url, "/api/v1/events/session-123");
    assert!(payload.sync.is_some());
}

#[test]
fn evaluate_client_sync_accepts_matching_snapshot() {
    let server_snapshot = ServerExecuteSnapshot {
        message_count: 3,
        last_message_id: Some("msg-3".to_string()),
        has_pending_question: true,
        pending_question_tool_call_id: Some("tool-1".to_string()),
        has_pending_user_message: false,
    };
    let client_sync = ExecuteClientSync {
        client_message_count: 3,
        client_last_message_id: Some("msg-3".to_string()),
        client_has_pending_question: true,
        client_pending_question_tool_call_id: Some("tool-1".to_string()),
    };

    assert_eq!(
        evaluate_client_sync_adapter(Some(&client_sync), &server_snapshot),
        None
    );
}

#[test]
fn evaluate_client_sync_detects_message_count_mismatch() {
    let server_snapshot = ServerExecuteSnapshot {
        message_count: 4,
        last_message_id: Some("msg-4".to_string()),
        has_pending_question: false,
        pending_question_tool_call_id: None,
        has_pending_user_message: true,
    };
    let client_sync = ExecuteClientSync {
        client_message_count: 3,
        client_last_message_id: Some("msg-4".to_string()),
        client_has_pending_question: false,
        client_pending_question_tool_call_id: None,
    };

    assert_eq!(
        evaluate_client_sync_adapter(Some(&client_sync), &server_snapshot),
        Some(ExecuteSyncReason::MessageCountMismatch)
    );
}

#[test]
fn evaluate_client_sync_detects_last_message_id_mismatch() {
    let server_snapshot = ServerExecuteSnapshot {
        message_count: 4,
        last_message_id: Some("msg-4".to_string()),
        has_pending_question: false,
        pending_question_tool_call_id: None,
        has_pending_user_message: true,
    };
    let client_sync = ExecuteClientSync {
        client_message_count: 4,
        client_last_message_id: Some("msg-3".to_string()),
        client_has_pending_question: false,
        client_pending_question_tool_call_id: None,
    };

    assert_eq!(
        evaluate_client_sync_adapter(Some(&client_sync), &server_snapshot),
        Some(ExecuteSyncReason::LastMessageIdMismatch)
    );
}

#[test]
fn evaluate_client_sync_detects_pending_question_mismatch() {
    let server_snapshot = ServerExecuteSnapshot {
        message_count: 4,
        last_message_id: Some("msg-4".to_string()),
        has_pending_question: true,
        pending_question_tool_call_id: Some("tool-2".to_string()),
        has_pending_user_message: false,
    };
    let client_sync = ExecuteClientSync {
        client_message_count: 4,
        client_last_message_id: Some("msg-4".to_string()),
        client_has_pending_question: true,
        client_pending_question_tool_call_id: Some("tool-1".to_string()),
    };

    assert_eq!(
        evaluate_client_sync_adapter(Some(&client_sync), &server_snapshot),
        Some(ExecuteSyncReason::PendingQuestionMismatch)
    );
}

#[test]
fn evaluate_client_sync_allows_missing_pending_question_tool_call_id() {
    let server_snapshot = ServerExecuteSnapshot {
        message_count: 4,
        last_message_id: Some("msg-4".to_string()),
        has_pending_question: true,
        pending_question_tool_call_id: Some("tool-2".to_string()),
        has_pending_user_message: false,
    };
    let client_sync = ExecuteClientSync {
        client_message_count: 4,
        client_last_message_id: Some("msg-4".to_string()),
        client_has_pending_question: true,
        client_pending_question_tool_call_id: None,
    };

    assert_eq!(
        evaluate_client_sync_adapter(Some(&client_sync), &server_snapshot),
        None
    );
}

mod idempotency_e2e {
    use actix_web::{http::StatusCode, test, web, App};
    use async_trait::async_trait;
    use bamboo_agent_core::{Message, Session};
    use bamboo_llm::{
        LLMChunk, LLMError, LLMProvider, LLMRequestOptions, LLMStream, ProviderModelRouter,
        ProviderRegistry,
    };
    use std::collections::HashMap;
    use std::sync::atomic::{AtomicUsize, Ordering};
    use std::sync::Arc;
    use tempfile::tempdir;
    use tokio::sync::Semaphore;

    use crate::routes::configure_routes;
    use crate::AppState;

    struct BlockingProvider {
        calls: AtomicUsize,
        started: Semaphore,
        release: Semaphore,
    }

    impl BlockingProvider {
        fn new() -> Arc<Self> {
            Arc::new(Self {
                calls: AtomicUsize::new(0),
                started: Semaphore::new(0),
                release: Semaphore::new(0),
            })
        }

        async fn response(&self) -> Result<LLMStream, LLMError> {
            self.calls.fetch_add(1, Ordering::SeqCst);
            self.started.add_permits(1);
            let _permit = self
                .release
                .acquire()
                .await
                .expect("release semaphore remains open");
            Ok(Box::pin(futures::stream::iter(vec![
                Ok(LLMChunk::Token("completed once".to_string())),
                Ok(LLMChunk::Done),
            ])))
        }
    }

    #[async_trait]
    impl LLMProvider for BlockingProvider {
        async fn chat_stream(
            &self,
            _messages: &[bamboo_agent_core::Message],
            _tools: &[bamboo_agent_core::ToolSchema],
            _max_output_tokens: Option<u32>,
            _model: &str,
        ) -> Result<LLMStream, LLMError> {
            self.response().await
        }

        async fn chat_stream_with_options(
            &self,
            _messages: &[bamboo_agent_core::Message],
            _tools: &[bamboo_agent_core::ToolSchema],
            _max_output_tokens: Option<u32>,
            _model: &str,
            _options: Option<&LLMRequestOptions>,
        ) -> Result<LLMStream, LLMError> {
            self.response().await
        }
    }

    async fn state_with_provider(provider: Arc<BlockingProvider>) -> web::Data<AppState> {
        let data_dir = tempdir().expect("tempdir").keep();
        bamboo_config::paths::init_bamboo_dir(data_dir.clone());
        let mut config = bamboo_llm::Config::from_data_dir(Some(data_dir.clone()));
        config.provider = "openai".to_string();
        config.providers_mut().openai = Some(bamboo_config::OpenAIConfig {
            model: Some("execute-model".to_string()),
            ..Default::default()
        });

        let provider_trait: Arc<dyn LLMProvider> = provider.clone();
        let mut state = AppState::new_with_provider(data_dir, config, provider_trait)
            .await
            .expect("app state");
        let mut providers = HashMap::new();
        providers.insert("openai".to_string(), provider as Arc<dyn LLMProvider>);
        state.provider_registry = Arc::new(ProviderRegistry::new(providers, "openai".to_string()));
        state.provider_router = Arc::new(ProviderModelRouter::new(state.provider_registry.clone()));
        web::Data::new(state)
    }

    async fn state_with_instance_providers(
        default_provider: Arc<BlockingProvider>,
        openai_provider: Arc<BlockingProvider>,
    ) -> web::Data<AppState> {
        let data_dir = tempdir().expect("tempdir").keep();
        bamboo_config::paths::init_bamboo_dir(data_dir.clone());
        let mut config = bamboo_llm::Config::from_data_dir(Some(data_dir.clone()));
        config.provider_instances.insert(
            "main-anthropic".to_string(),
            serde_json::from_value(serde_json::json!({
                "provider_type": "anthropic",
                "model": "claude-main",
                "enabled": true
            }))
            .unwrap(),
        );
        config.provider_instances.insert(
            "work-openai".to_string(),
            serde_json::from_value(serde_json::json!({
                "provider_type": "openai",
                "model": "gpt-work",
                "enabled": true
            }))
            .unwrap(),
        );
        config.default_provider_instance = Some("main-anthropic".to_string());
        config.features.provider_model_ref = true;

        let runtime_default: Arc<dyn LLMProvider> = default_provider.clone();
        let mut state = AppState::new_with_provider(data_dir, config, runtime_default)
            .await
            .expect("app state");
        let mut providers = HashMap::new();
        providers.insert(
            "main-anthropic".to_string(),
            default_provider as Arc<dyn LLMProvider>,
        );
        providers.insert(
            "work-openai".to_string(),
            openai_provider as Arc<dyn LLMProvider>,
        );
        state.provider_registry = Arc::new(ProviderRegistry::new(
            providers,
            "main-anthropic".to_string(),
        ));
        state.provider_router = Arc::new(ProviderModelRouter::new(state.provider_registry.clone()));
        web::Data::new(state)
    }

    /// #733: execute retries replay the original Accepted response (including
    /// run_id) instead of entering preparation or spawning another agent loop.
    #[actix_web::test]
    async fn idempotency_key_replays_execute_without_duplicate_run() {
        let provider = BlockingProvider::new();
        let state = state_with_provider(provider.clone()).await;
        let session_id = "execute-idempotency-733";
        let mut session = Session::new(session_id, "execute-model");
        session.title_generated = true;
        session.add_message(Message::user("run exactly once"));
        crate::handlers::agent::events::mark_pending_turn(&mut session);
        state.save_and_cache_session(&mut session).await;

        let app = test::init_service(
            App::new()
                .app_data(state.clone())
                .configure(configure_routes),
        )
        .await;
        let request = || {
            test::TestRequest::post()
                .uri(&format!("/api/v1/execute/{session_id}"))
                .insert_header(("Idempotency-Key", "execute-retry-733"))
                .set_json(serde_json::json!({}))
                .to_request()
        };

        let first = test::call_service(&app, request()).await;
        assert_eq!(first.status(), StatusCode::ACCEPTED);
        let first_body = test::read_body(first).await;
        tokio::time::timeout(
            std::time::Duration::from_secs(2),
            provider.started.acquire(),
        )
        .await
        .expect("agent provider started")
        .expect("started semaphore remains open")
        .forget();

        let replay = test::call_service(&app, request()).await;
        assert_eq!(replay.status(), StatusCode::ACCEPTED);
        let replay_body = test::read_body(replay).await;
        assert_eq!(
            replay_body, first_body,
            "retry must replay the first run_id"
        );
        tokio::time::sleep(std::time::Duration::from_millis(25)).await;
        assert_eq!(provider.calls.load(Ordering::SeqCst), 1);
        assert_eq!(state.agent_runners.read().await.len(), 1);

        let cancel = state
            .agent_runners
            .read()
            .await
            .get(session_id)
            .expect("runner remains registered")
            .cancel_token
            .clone();
        cancel.cancel();
        provider.release.add_permits(1);
        tokio::time::sleep(std::time::Duration::from_millis(25)).await;
    }

    #[actix_web::test]
    async fn execute_builtin_provider_type_routes_to_custom_instance_not_runtime_default() {
        let default_provider = BlockingProvider::new();
        let openai_provider = BlockingProvider::new();
        let state =
            state_with_instance_providers(default_provider.clone(), openai_provider.clone()).await;
        let session_id = "execute-provider-type-alias";
        let mut session = Session::new(session_id, "gpt-work");
        session.title_generated = true;
        session.add_message(Message::user("route to the OpenAI instance"));
        crate::handlers::agent::events::mark_pending_turn(&mut session);
        state.save_and_cache_session(&mut session).await;

        let app = test::init_service(
            App::new()
                .app_data(state.clone())
                .configure(configure_routes),
        )
        .await;
        let response = test::call_service(
            &app,
            test::TestRequest::post()
                .uri(&format!("/api/v1/execute/{session_id}"))
                .set_json(serde_json::json!({
                    "model_ref": {"provider": "openai", "model": "gpt-work"}
                }))
                .to_request(),
        )
        .await;
        assert_eq!(response.status(), StatusCode::ACCEPTED);
        tokio::time::timeout(
            std::time::Duration::from_secs(2),
            openai_provider.started.acquire(),
        )
        .await
        .expect("OpenAI instance started")
        .expect("started semaphore remains open")
        .forget();
        assert_eq!(openai_provider.calls.load(Ordering::SeqCst), 1);
        assert_eq!(default_provider.calls.load(Ordering::SeqCst), 0);

        let persisted = state
            .storage
            .load_session(session_id)
            .await
            .expect("session load")
            .expect("session exists");
        assert_eq!(
            persisted
                .model_ref
                .as_ref()
                .map(|model_ref| model_ref.provider.as_str()),
            Some("work-openai")
        );

        let cancel = state
            .agent_runners
            .read()
            .await
            .get(session_id)
            .expect("runner remains registered")
            .cancel_token
            .clone();
        cancel.cancel();
        openai_provider.release.add_permits(1);
        tokio::time::sleep(std::time::Duration::from_millis(25)).await;
    }

    #[actix_web::test]
    async fn execute_canonicalizes_legacy_session_provider_ref_before_resume() {
        let default_provider = BlockingProvider::new();
        let openai_provider = BlockingProvider::new();
        let state =
            state_with_instance_providers(default_provider.clone(), openai_provider.clone()).await;
        let session_id = "execute-legacy-session-provider-ref";
        let mut session = Session::new(session_id, "gpt-work");
        session.model_ref = Some(bamboo_domain::ProviderModelRef::new("openai", "gpt-work"));
        session.set_provider_name("openai");
        session.title_generated = true;
        session.add_message(Message::user("resume the migrated session"));
        crate::handlers::agent::events::mark_pending_turn(&mut session);
        state.save_and_cache_session(&mut session).await;

        let app = test::init_service(
            App::new()
                .app_data(state.clone())
                .configure(configure_routes),
        )
        .await;
        let response = test::call_service(
            &app,
            test::TestRequest::post()
                .uri(&format!("/api/v1/execute/{session_id}"))
                .set_json(serde_json::json!({}))
                .to_request(),
        )
        .await;
        assert_eq!(response.status(), StatusCode::ACCEPTED);
        tokio::time::timeout(
            std::time::Duration::from_secs(2),
            openai_provider.started.acquire(),
        )
        .await
        .expect("migrated OpenAI instance started")
        .expect("started semaphore remains open")
        .forget();
        assert_eq!(openai_provider.calls.load(Ordering::SeqCst), 1);
        assert_eq!(default_provider.calls.load(Ordering::SeqCst), 0);

        let persisted = state
            .storage
            .load_session(session_id)
            .await
            .expect("session load")
            .expect("session exists");
        assert_eq!(
            persisted
                .model_ref
                .as_ref()
                .map(|model_ref| model_ref.provider.as_str()),
            Some("work-openai")
        );

        let cancel = state
            .agent_runners
            .read()
            .await
            .get(session_id)
            .expect("runner remains registered")
            .cancel_token
            .clone();
        cancel.cancel();
        openai_provider.release.add_permits(1);
        tokio::time::sleep(std::time::Duration::from_millis(25)).await;
    }

    #[actix_web::test]
    async fn execute_unknown_explicit_provider_fails_before_runner_reservation() {
        let default_provider = BlockingProvider::new();
        let openai_provider = BlockingProvider::new();
        let state =
            state_with_instance_providers(default_provider.clone(), openai_provider.clone()).await;
        let session_id = "execute-unknown-provider";
        let mut session = Session::new(session_id, "unknown-model");
        session.title_generated = true;
        session.add_message(Message::user("must fail closed"));
        crate::handlers::agent::events::mark_pending_turn(&mut session);
        state.save_and_cache_session(&mut session).await;

        let app = test::init_service(
            App::new()
                .app_data(state.clone())
                .configure(configure_routes),
        )
        .await;
        let response = test::call_service(
            &app,
            test::TestRequest::post()
                .uri(&format!("/api/v1/execute/{session_id}"))
                .set_json(serde_json::json!({
                    "model_ref": {"provider": "missing-instance", "model": "unknown-model"}
                }))
                .to_request(),
        )
        .await;
        assert_eq!(response.status(), StatusCode::BAD_REQUEST);
        assert_eq!(default_provider.calls.load(Ordering::SeqCst), 0);
        assert_eq!(openai_provider.calls.load(Ordering::SeqCst), 0);
        assert!(!state.agent_runners.read().await.contains_key(session_id));
    }
}

#[actix_web::test]
async fn startup_failure_persists_and_broadcasts_for_owned_turn() {
    use actix_web::web;
    use bamboo_agent_core::{AgentEvent, Message, Session};

    let dir = tempfile::tempdir().expect("temporary app data");
    let state = web::Data::new(
        crate::AppState::new(dir.path().to_path_buf())
            .await
            .expect("app state"),
    );
    let session_id = "owned-startup-failure";
    let mut session = Session::new(session_id, "test-model");
    session.add_message(Message::user("start"));
    crate::handlers::agent::events::mark_pending_turn(&mut session);
    let turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
    state.save_and_cache_session(&mut session).await;
    let mut receiver = state.get_session_event_sender(session_id).await.subscribe();
    let mut startup_guard =
        crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);

    super::fail_pending_startup(
        &state,
        session_id,
        Some(&turn_id),
        "provider rejected",
        &mut startup_guard,
    )
    .await;

    let stored = state
        .storage
        .load_session(session_id)
        .await
        .expect("load session")
        .expect("stored session");
    assert_eq!(stored.last_run_status().as_deref(), Some("error"));
    assert!(stored
        .last_run_error()
        .is_some_and(|message| message.contains("provider rejected")));
    assert!(matches!(
        receiver.try_recv(),
        Ok(AgentEvent::Error { message }) if message.contains("provider rejected")
    ));
}

#[actix_web::test]
async fn pending_or_running_runner_wins_over_same_work_id_failure() {
    use actix_web::web;
    use bamboo_agent_core::{Message, Session};

    for (suffix, status) in [
        ("pending", crate::app_state::AgentStatus::Pending),
        ("running", crate::app_state::AgentStatus::Running),
    ] {
        let dir = tempfile::tempdir().expect("temporary app data");
        let state = web::Data::new(
            crate::AppState::new(dir.path().to_path_buf())
                .await
                .expect("app state"),
        );
        let session_id = format!("runner-wins-{suffix}");
        let mut session = Session::new(&session_id, "test-model");
        session.add_message(Message::user("start"));
        crate::handlers::agent::events::mark_pending_turn(&mut session);
        let turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
        state.save_and_cache_session(&mut session).await;
        let mut receiver = state
            .get_session_event_sender(&session_id)
            .await
            .subscribe();
        let mut runner = crate::app_state::AgentRunner::new();
        runner.status = status;
        state
            .agent_runners
            .write()
            .await
            .insert(session_id.clone(), runner);
        let mut startup_guard =
            crate::handlers::agent::events::begin_execute_startup(state.get_ref(), &session_id);

        super::fail_pending_startup(
            &state,
            &session_id,
            Some(&turn_id),
            "overlapping rejection",
            &mut startup_guard,
        )
        .await;

        let stored = state
            .storage
            .load_session(&session_id)
            .await
            .expect("load session")
            .expect("stored session");
        assert_eq!(stored.last_run_status().as_deref(), Some("pending"));
        assert_eq!(
            crate::handlers::agent::events::startup_work_id(&stored).as_deref(),
            Some(turn_id.as_str())
        );
        assert!(receiver.try_recv().is_err(), "live runner must stay silent");
    }
}

#[actix_web::test]
async fn overlapping_preparation_failure_defers_to_other_owner_and_runner() {
    use actix_web::web;
    use bamboo_agent_core::{Message, Session};

    let dir = tempfile::tempdir().expect("temporary app data");
    let state = web::Data::new(
        crate::AppState::new(dir.path().to_path_buf())
            .await
            .expect("app state"),
    );
    let session_id = "overlap-prep-runner-wins";
    let mut session = Session::new(session_id, "test-model");
    session.add_message(Message::user("start"));
    crate::handlers::agent::events::mark_pending_turn(&mut session);
    let turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
    state.save_and_cache_session(&mut session).await;
    let mut receiver = state.get_session_event_sender(session_id).await.subscribe();
    let mut first =
        crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);
    let second = crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);

    super::fail_pending_startup(
        &state,
        session_id,
        Some(&turn_id),
        "first preparation rejected",
        &mut first,
    )
    .await;
    assert!(receiver.try_recv().is_err());

    let mut runner = crate::app_state::AgentRunner::new();
    runner.status = crate::app_state::AgentStatus::Pending;
    state
        .agent_runners
        .write()
        .await
        .insert(session_id.to_string(), runner);
    drop(second);

    let stored = state
        .storage
        .load_session(session_id)
        .await
        .expect("load session")
        .expect("stored session");
    assert_eq!(stored.last_run_status().as_deref(), Some("pending"));
    assert_eq!(
        crate::handlers::agent::events::startup_work_id(&stored).as_deref(),
        Some(turn_id.as_str())
    );
    assert!(
        receiver.try_recv().is_err(),
        "other preparation owns startup"
    );
}

#[actix_web::test]
async fn last_of_two_preparation_failures_broadcasts_exactly_once() {
    use actix_web::web;
    use bamboo_agent_core::{AgentEvent, Message, Session};

    let dir = tempfile::tempdir().expect("temporary app data");
    let state = web::Data::new(
        crate::AppState::new(dir.path().to_path_buf())
            .await
            .expect("app state"),
    );
    let session_id = "overlap-prep-both-fail";
    let mut session = Session::new(session_id, "test-model");
    session.add_message(Message::user("start"));
    crate::handlers::agent::events::mark_pending_turn(&mut session);
    let turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
    state.save_and_cache_session(&mut session).await;
    let mut receiver = state.get_session_event_sender(session_id).await.subscribe();
    let mut first =
        crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);
    let mut second =
        crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);

    super::fail_pending_startup(
        &state,
        session_id,
        Some(&turn_id),
        "first preparation rejected",
        &mut first,
    )
    .await;
    assert!(receiver.try_recv().is_err(), "first owner must defer");
    super::fail_pending_startup(
        &state,
        session_id,
        Some(&turn_id),
        "second preparation rejected",
        &mut second,
    )
    .await;

    assert!(matches!(
        receiver.try_recv(),
        Ok(AgentEvent::Error { message }) if message.contains("second preparation rejected")
    ));
    assert!(
        receiver.try_recv().is_err(),
        "only one failure is broadcast"
    );
    let stored = state
        .storage
        .load_session(session_id)
        .await
        .expect("load session")
        .expect("stored session");
    assert_eq!(stored.last_run_status().as_deref(), Some("error"));
    assert!(crate::handlers::agent::events::startup_work_id(&stored).is_none());
}

#[actix_web::test]
async fn startup_failure_waiting_on_lock_cannot_overwrite_newer_turn() {
    use actix_web::web;
    use bamboo_agent_core::{Message, Session};

    let dir = tempfile::tempdir().expect("temporary app data");
    let state = web::Data::new(
        crate::AppState::new(dir.path().to_path_buf())
            .await
            .expect("app state"),
    );
    let session_id = "stale-startup-failure";
    let mut session = Session::new(session_id, "test-model");
    session.add_message(Message::user("first"));
    crate::handlers::agent::events::mark_pending_turn(&mut session);
    let stale_turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
    state.save_and_cache_session(&mut session).await;
    let mut receiver = state.get_session_event_sender(session_id).await.subscribe();

    // Model a newer chat writer already inside the canonical per-session lock.
    // The stale preparation failure starts and blocks behind it.
    let chat_guard = state.persistence.acquire_lock(session_id).await;
    let failure_state = state.clone();
    let mut failure_guard =
        crate::handlers::agent::events::begin_execute_startup(state.get_ref(), session_id);
    let failure = tokio::spawn(async move {
        super::fail_pending_startup(
            &failure_state,
            session_id,
            Some(&stale_turn_id),
            "late rejection",
            &mut failure_guard,
        )
        .await;
    });
    tokio::time::sleep(std::time::Duration::from_millis(10)).await;
    assert!(
        !failure.is_finished(),
        "stale failure must be waiting on the session lock"
    );

    session.add_message(Message::user("newer"));
    crate::handlers::agent::events::mark_pending_turn(&mut session);
    let current_turn_id = crate::handlers::agent::events::startup_work_id(&session).unwrap();
    state
        .storage
        .save_session(&session)
        .await
        .expect("persist newer turn while owning session lock");
    state.sessions.insert(
        session_id.to_string(),
        std::sync::Arc::new(bamboo_engine::SessionSnapshot::new(session)),
    );
    drop(chat_guard);
    failure.await.expect("failure task completes");

    let stored = state
        .storage
        .load_session(session_id)
        .await
        .expect("load session")
        .expect("stored session");
    assert_eq!(
        crate::handlers::agent::events::startup_work_id(&stored).as_deref(),
        Some(current_turn_id.as_str())
    );
    assert_eq!(stored.last_run_status().as_deref(), Some("pending"));
    assert!(receiver.try_recv().is_err(), "stale failure must be silent");
}