bamboo_engine/runtime/execution/
agent_spawn.rs

1//! Core agent execution spawning logic.
2//!
3//! Provides [`spawn_session_execution`] which handles the full lifecycle of a
4//! background agent run: spawn task → execute → finalize runner → persist session.
5
6use std::collections::{BTreeSet, HashMap};
7use std::sync::Arc;
8
9use tokio::sync::{mpsc, RwLock};
10use tokio_util::sync::CancellationToken;
11use tracing::Instrument;
12
13use bamboo_agent_core::tools::ToolExecutor;
14use bamboo_agent_core::{AgentEvent, Session};
15use bamboo_domain::ReasoningEffort;
16use bamboo_infrastructure::LLMProvider;
17
18use crate::runtime::config::ImageFallbackConfig;
19use crate::runtime::execution::runner_lifecycle::finalize_runner;
20use crate::runtime::execution::runner_state::AgentRunner;
21use crate::runtime::Agent;
22use crate::runtime::ExecuteRequest;
23
24const SKILL_CONTEXT_START_MARKER: &str = "<!-- BAMBOO_SKILL_CONTEXT_START -->";
25const TOOL_GUIDE_START_MARKER: &str = "<!-- BAMBOO_TOOL_GUIDE_START -->";
26const EXTERNAL_MEMORY_START_MARKER: &str = "<!-- BAMBOO_EXTERNAL_MEMORY_START -->";
27const TASK_LIST_START_MARKER: &str = "<!-- BAMBOO_TASK_LIST_START -->";
28
29/// Arguments for spawning a background agent execution.
30///
31/// This is the crate-agnostic equivalent of the server's `SpawnAgentExecution`.
32/// It holds everything needed to run the agent loop and persist the result,
33/// without depending on HTTP types or `AppState`.
34pub struct SessionExecutionArgs {
35    // Core execution.
36    pub agent: Arc<Agent>,
37    pub session_id: String,
38    pub session: Session,
39
40    // Execution parameters.
41    pub tools_override: Option<Arc<dyn ToolExecutor>>,
42    pub provider_override: Option<Arc<dyn LLMProvider>>,
43    pub provider_name: Option<String>,
44    pub provider_type: Option<String>,
45    pub model: String,
46    pub fast_model: Option<String>,
47    /// Optional provider override for lightweight fast-model calls.
48    pub fast_model_provider: Option<Arc<dyn LLMProvider>>,
49    pub background_model: Option<String>,
50    /// Optional provider override for memory/background model calls.
51    pub background_model_provider: Option<Arc<dyn LLMProvider>>,
52    pub summarization_model: Option<String>,
53    /// Optional provider override for summarization / context compression calls.
54    pub summarization_model_provider: Option<Arc<dyn LLMProvider>>,
55    pub reasoning_effort: Option<ReasoningEffort>,
56    pub reasoning_effort_source: String,
57    pub auxiliary_model_resolver:
58        Option<Arc<dyn Fn() -> crate::runtime::config::AuxiliaryModelConfig + Send + Sync>>,
59    pub disabled_tools: Option<BTreeSet<String>>,
60    pub disabled_skill_ids: Option<BTreeSet<String>>,
61    pub selected_skill_ids: Option<Vec<String>>,
62    pub selected_skill_mode: Option<String>,
63    pub cancel_token: CancellationToken,
64    pub mpsc_tx: mpsc::Sender<AgentEvent>,
65    pub image_fallback: Option<ImageFallbackConfig>,
66    pub app_data_dir: Option<std::path::PathBuf>,
67
68    // Post-execution resources.
69    pub runners: Arc<RwLock<HashMap<String, AgentRunner>>>,
70    pub sessions_cache: Arc<RwLock<HashMap<String, Session>>>,
71}
72
73/// Spawn a background agent execution task.
74///
75/// This function spawns a tokio task that:
76/// 1. Executes the agent loop via `agent.execute()`
77/// 2. Sends a terminal error event if the execution fails
78/// 3. Finalizes the runner status
79/// 4. Persists the session via merge-save (preserves concurrent UI title/pin edits)
80/// 5. Updates the in-memory session cache
81pub fn spawn_session_execution(args: SessionExecutionArgs) {
82    let span_session_id = args.session_id.clone();
83    let session_span = tracing::info_span!("agent_execution", session_id = %span_session_id);
84
85    tokio::spawn(
86        async move {
87            let SessionExecutionArgs {
88                agent,
89                session_id,
90                mut session,
91                tools_override,
92                provider_override,
93                provider_name,
94                provider_type,
95                model,
96                fast_model,
97                fast_model_provider,
98                background_model,
99                background_model_provider,
100                summarization_model,
101                summarization_model_provider,
102                reasoning_effort,
103                reasoning_effort_source,
104                auxiliary_model_resolver,
105                disabled_tools,
106                disabled_skill_ids,
107                selected_skill_ids,
108                selected_skill_mode,
109                cancel_token,
110                mpsc_tx,
111                image_fallback,
112                app_data_dir,
113                runners,
114                sessions_cache,
115            } = args;
116
117            let initial_message = initial_user_message_for_session(&session);
118            let selected_skill_ids =
119                selected_skill_ids.or_else(|| selected_skill_ids_for_session(&session));
120            let selected_skill_mode =
121                selected_skill_mode.or_else(|| selected_skill_mode_for_session(&session));
122
123            tracing::info!(
124                "[{}] Using resolved session model: {}, reasoning_effort={}, reasoning_source={}",
125                session_id,
126                model,
127                reasoning_effort
128                    .map(ReasoningEffort::as_str)
129                    .unwrap_or("none"),
130                reasoning_effort_source
131            );
132
133            session.model = model.clone();
134
135            let system_prompt = system_prompt_for_session(&session);
136            if let Some(prompt) = system_prompt.as_ref() {
137                log_base_system_prompt_snapshot(&session_id, prompt);
138            }
139
140            let result = agent
141                .execute(
142                    &mut session,
143                    ExecuteRequest {
144                        initial_message,
145                        event_tx: mpsc_tx.clone(),
146                        cancel_token,
147                        tools: tools_override,
148                        provider_override,
149                        model: Some(model),
150                        provider_name,
151                        provider_type,
152                        fast_model,
153                        fast_model_provider,
154                        background_model,
155                        background_model_provider,
156                        summarization_model,
157                        summarization_model_provider,
158                        reasoning_effort,
159                        auxiliary_model_resolver,
160                        disabled_tools,
161                        disabled_skill_ids,
162                        selected_skill_ids,
163                        selected_skill_mode,
164                        image_fallback,
165                        app_data_dir,
166                    },
167                )
168                .await;
169
170            // Send terminal event for all error cases (including cancellation).
171            if let Some(error_event) = terminal_error_event_for_result(&result) {
172                let _ = mpsc_tx.send(error_event).await;
173            }
174
175            // Update runner status.
176            finalize_runner(&runners, &session_id, &result).await;
177
178            // Save session via merge-save so any concurrent UI edits to
179            // title / pinned / title_version are preserved (the runtime is not
180            // an authoritative title writer).
181            if let Err(error) = agent.persistence().save_runtime_session(&mut session).await {
182                tracing::warn!("[{}] Failed to save session: {}", session_id, error);
183            }
184
185            // Update memory cache.
186            {
187                let mut sessions = sessions_cache.write().await;
188                sessions.insert(session_id.clone(), session);
189            }
190
191            tracing::info!("[{}] Agent execution completed", session_id);
192        }
193        .instrument(session_span),
194    );
195}
196
197/// Log a snapshot of the base system prompt for debugging.
198pub fn log_base_system_prompt_snapshot(session_id: &str, prompt: &str) {
199    tracing::info!(
200        "[{}] Base system prompt snapshot: len={} chars, has_skill={}, has_tool_guide={}, has_external_memory={}, has_task_list={}",
201        session_id,
202        prompt.len(),
203        prompt.contains(SKILL_CONTEXT_START_MARKER),
204        prompt.contains(TOOL_GUIDE_START_MARKER),
205        prompt.contains(EXTERNAL_MEMORY_START_MARKER),
206        prompt.contains(TASK_LIST_START_MARKER),
207    );
208
209    tracing::debug!(
210        "[{}] ========== BASE SYSTEM PROMPT SNAPSHOT ==========",
211        session_id
212    );
213    tracing::debug!("[{}] Snapshot length: {} chars", session_id, prompt.len());
214    tracing::debug!("[{}] -----------------------------------", session_id);
215    tracing::debug!("[{}] {}", session_id, prompt);
216    tracing::debug!(
217        "[{}] ========== END BASE SYSTEM PROMPT SNAPSHOT ==========",
218        session_id
219    );
220}
221
222/// Map an execution result to a terminal error event.
223pub fn terminal_error_event_for_result<E>(result: &Result<(), E>) -> Option<AgentEvent>
224where
225    E: std::fmt::Display,
226{
227    match result {
228        Ok(_) => None,
229        Err(error) if is_cancelled_error(error) => Some(AgentEvent::Error {
230            message: "Agent execution cancelled by user".to_string(),
231        }),
232        Err(error) => Some(AgentEvent::Error {
233            message: error.to_string(),
234        }),
235    }
236}
237
238fn is_cancelled_error<E>(error: &E) -> bool
239where
240    E: std::fmt::Display,
241{
242    error.to_string().contains("cancelled")
243}
244
245// Session metadata helpers (pure functions, no server dependency).
246
247fn system_prompt_for_session(session: &Session) -> Option<String> {
248    session
249        .messages
250        .iter()
251        .find(|message| matches!(message.role, bamboo_agent_core::Role::System))
252        .map(|message| message.content.clone())
253}
254
255fn initial_user_message_for_session(session: &Session) -> String {
256    session
257        .messages
258        .last()
259        .filter(|message| matches!(message.role, bamboo_agent_core::Role::User))
260        .map(|message| message.content.clone())
261        .unwrap_or_default()
262}
263
264fn selected_skill_ids_for_session(session: &Session) -> Option<Vec<String>> {
265    session
266        .metadata
267        .get("selected_skill_ids")
268        .and_then(|raw| crate::skills::selection::parse_selected_skill_ids_metadata(raw))
269}
270
271fn selected_skill_mode_for_session(session: &Session) -> Option<String> {
272    let value = session
273        .metadata
274        .get("skill_mode")
275        .or_else(|| session.metadata.get("mode"))?;
276    let trimmed = value.trim();
277    if trimmed.is_empty() {
278        None
279    } else {
280        Some(trimmed.to_string())
281    }
282}
bamboo_engine/runtime/execution/agent_spawn.rs

bamboo_engine/runtime/execution/
agent_spawn.rs
