fix(orchestrator): corrige la delegation inter-agent GLM/OpenCode sans reponse Final

La detection d'absence de reponse structuree finale (structured_no_reply_error)
ne couvrait pas AgentSessionError::Decode ni le message "aucun final textuel
exploitable" emis par l'adaptateur OpenCode, ce qui laissait idea_ask_agent
planter silencieusement sur les profils GLM/OpenCode au lieu de retomber sur
le chemin de secours prevu.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

crates/infrastructure/src/session/opencode.rs

@@ -3,7 +3,8 @@
 //! OpenCode est piloté comme host process local : IdeA génère un `opencode.json`
 //! isolé dans le run dir, OpenCode lance le bridge MCP `idea`, puis chaque tour est
 //! un `opencode run --format json <prompt>`. L'adapter ne connaît que le contrat
-//! JSONL minimal observé/cadré : `step_start`, `text`, `step_finish`.
+//! JSONL observé/cadré : `step_start`, `text(part.text)`, `tool_use`,
+//! `step_finish`, `error`.
 
 use std::process::Stdio;
 use std::sync::Arc;
@@ -25,6 +26,8 @@ pub enum ParsedEvent {
     StepStart,
     /// Fragment texte assistant.
     Text(String),
+    /// Activité outil OpenCode.
+    ToolActivity(String),
     /// Fin d'étape OpenCode.
     StepFinish,
     /// Erreur terminale remontée par OpenCode.
@@ -41,14 +44,13 @@ pub fn extract_session_id(line: &str) -> Result<Option<String>, AgentSessionErro
     }
     let value: Value = serde_json::from_str(trimmed)
         .map_err(|e| AgentSessionError::Decode(format!("ligne JSON OpenCode illisible: {e}")))?;
-    Ok(value
-        .get("sessionID")
-        .or_else(|| value.get("session_id"))
-        .or_else(|| value.get("sessionId"))
-        .and_then(Value::as_str)
-        .map(str::trim)
-        .filter(|id| !id.is_empty())
-        .map(str::to_owned))
+    Ok(
+        json_string_field(&value, &["sessionID", "session_id", "sessionId"]).or_else(|| {
+            value
+                .get("part")
+                .and_then(|part| json_string_field(part, &["sessionID", "session_id", "sessionId"]))
+        }),
+    )
 }
 
 /// Message d'erreur par défaut quand `error` n'est ni une chaîne ni un objet exploitable.
@@ -59,34 +61,77 @@ const OPENCODE_ERROR_FALLBACK: &str = "OpenCode a signalé une erreur sans déta
 /// # Errors
 /// [`AgentSessionError::Decode`] si la ligne non vide n'est pas du JSON valide.
 pub fn parse_jsonl_event(line: &str) -> Result<ParsedEvent, AgentSessionError> {
+    parse_jsonl_record(line).map(|record| record.event)
+}
+
+#[derive(Debug, Clone)]
+struct ParsedRecord {
+    event: ParsedEvent,
+    session_id: Option<String>,
+    message_id: Option<String>,
+}
+
+fn parse_jsonl_record(line: &str) -> Result<ParsedRecord, AgentSessionError> {
     let trimmed = line.trim();
     if trimmed.is_empty() {
-        return Ok(ParsedEvent::Ignored);
+        return Ok(ParsedRecord {
+            event: ParsedEvent::Ignored,
+            session_id: None,
+            message_id: None,
+        });
     }
     let value: Value = serde_json::from_str(trimmed)
         .map_err(|e| AgentSessionError::Decode(format!("ligne JSON OpenCode illisible: {e}")))?;
-    match value.get("type").and_then(Value::as_str) {
-        Some("step_start") | Some("step.start") => Ok(ParsedEvent::StepStart),
-        Some("step_finish") | Some("step.finish") => Ok(ParsedEvent::StepFinish),
+    let part = value.get("part");
+    let session_id =
+        json_string_field(&value, &["sessionID", "session_id", "sessionId"]).or_else(|| {
+            part.and_then(|part| json_string_field(part, &["sessionID", "session_id", "sessionId"]))
+        });
+    let message_id =
+        json_string_field(&value, &["messageID", "message_id", "messageId"]).or_else(|| {
+            part.and_then(|part| json_string_field(part, &["messageID", "message_id", "messageId"]))
+        });
+    let event = match value.get("type").and_then(Value::as_str).or_else(|| {
+        part.and_then(|part| part.get("type"))
+            .and_then(Value::as_str)
+    }) {
+        Some("step_start" | "step.start" | "step-start") => ParsedEvent::StepStart,
+        Some("step_finish" | "step.finish" | "step-finish") => ParsedEvent::StepFinish,
         // Le texte réel est niché sous `.part.text` (cf. `packages/opencode/src/cli/cmd/run.ts`) ;
         // un seul événement `text` par part, déjà finalisé — pas de delta à dédupliquer.
-        Some("text") => Ok(ParsedEvent::Text(
-            value
-                .get("part")
-                .and_then(|part| part.get("text"))
-                .and_then(Value::as_str)
-                .unwrap_or_default()
-                .to_owned(),
-        )),
-        Some("error") => Ok(ParsedEvent::Error(opencode_error_message(&value))),
-        _ => Ok(ParsedEvent::Ignored),
-    }
+        Some("text") => part
+            .and_then(|part| part.get("text"))
+            .or_else(|| value.get("text"))
+            .or_else(|| value.get("content"))
+            .and_then(Value::as_str)
+            .map(|text| ParsedEvent::Text(text.to_owned()))
+            .unwrap_or(ParsedEvent::Ignored),
+        Some("tool_use" | "tool.use" | "tool") => ParsedEvent::ToolActivity(tool_label(&value)),
+        Some("error" | "session.error") => ParsedEvent::Error(opencode_error_message(&value)),
+        _ => ParsedEvent::Ignored,
+    };
+    Ok(ParsedRecord {
+        event,
+        session_id,
+        message_id,
+    })
+}
+
+fn json_string_field(value: &Value, names: &[&str]) -> Option<String> {
+    names
+        .iter()
+        .find_map(|name| value.get(*name).and_then(Value::as_str))
+        .map(str::trim)
+        .filter(|id| !id.is_empty())
+        .map(str::to_owned)
 }
 
 /// Extrait un message d'erreur exploitable depuis `value.error`, qu'il s'agisse d'une
 /// chaîne brute ou d'un objet `{message: ...}` (forme exacte non confirmée empiriquement).
 fn opencode_error_message(value: &Value) -> String {
-    let error = value.get("error");
+    let error = value
+        .get("error")
+        .or_else(|| value.get("properties").and_then(|props| props.get("error")));
     error
         .and_then(Value::as_str)
         .map(str::to_owned)
@@ -96,29 +141,59 @@ fn opencode_error_message(value: &Value) -> String {
                 .and_then(Value::as_str)
                 .map(str::to_owned)
         })
+        .or_else(|| {
+            error
+                .and_then(|e| e.get("data"))
+                .and_then(|data| data.get("message"))
+                .and_then(Value::as_str)
+                .map(str::to_owned)
+        })
+        .or_else(|| {
+            error
+                .and_then(|e| e.get("name"))
+                .and_then(Value::as_str)
+                .map(str::to_owned)
+        })
         .unwrap_or_else(|| OPENCODE_ERROR_FALLBACK.to_owned())
 }
 
+fn tool_label(value: &Value) -> String {
+    let part = value.get("part").unwrap_or(value);
+    json_string_field(part, &["tool", "name"])
+        .or_else(|| json_string_field(value, &["tool", "name"]))
+        .unwrap_or_else(|| "outil OpenCode".to_owned())
+}
+
 /// Convertit des lignes JSONL OpenCode en événements domaine.
 ///
-/// Le `Final` est la concaténation ordonnée des événements `text`. Un tour sans
-/// texte mais terminé proprement (`step_finish`) émet un `Final` vide : cela
-/// couvre les tours tool-call-only tout en gardant un hard-fail pour un vrai flux
-/// vide, uniquement ignoré, ou seulement démarré.
+/// Le `Final` est la concaténation ordonnée des événements `text` du tour courant.
+/// Si OpenCode rejoue des événements d'une même session, les identifiants de
+/// message (`messageID`/`messageId`) servent à conserver seulement le dernier
+/// message assistant observable. Un tour terminé sans texte exploitable est une
+/// erreur de décodage, pas un succès vide.
 pub fn parse_jsonl_turn(lines: &[String]) -> Result<Vec<ReplyEvent>, AgentSessionError> {
+    parse_jsonl_turn_scoped(lines, None)
+}
+
+fn parse_jsonl_turn_scoped(
+    lines: &[String],
+    expected_session_id: Option<&str>,
+) -> Result<Vec<ReplyEvent>, AgentSessionError> {
+    let records = current_turn_records(lines, expected_session_id)?;
     let mut events = Vec::new();
     let mut final_text = String::new();
     let mut error_seen = false;
-    let mut step_finish_seen = false;
-    for line in lines {
-        match parse_jsonl_event(line)? {
+    for record in records {
+        match record.event {
             ParsedEvent::StepStart => {
                 events.push(ReplyEvent::Heartbeat);
             }
             ParsedEvent::StepFinish => {
-                step_finish_seen = true;
                 events.push(ReplyEvent::Heartbeat);
             }
+            ParsedEvent::ToolActivity(label) => {
+                events.push(ReplyEvent::ToolActivity { label });
+            }
             ParsedEvent::Text(text) => {
                 if !text.is_empty() {
                     final_text.push_str(&text);
@@ -136,14 +211,8 @@ pub fn parse_jsonl_turn(lines: &[String]) -> Result<Vec<ReplyEvent>, AgentSessio
         if error_seen {
             return Ok(events);
         }
-        if step_finish_seen {
-            events.push(ReplyEvent::Final {
-                content: String::new(),
-            });
-            return Ok(events);
-        }
         return Err(AgentSessionError::Decode(
-            "OpenCode n'a produit aucun final textuel".to_owned(),
+            "OpenCode n'a produit aucun final textuel exploitable".to_owned(),
         ));
     }
     events.push(ReplyEvent::Final {
@@ -152,6 +221,49 @@ pub fn parse_jsonl_turn(lines: &[String]) -> Result<Vec<ReplyEvent>, AgentSessio
     Ok(events)
 }
 
+fn current_turn_records(
+    lines: &[String],
+    expected_session_id: Option<&str>,
+) -> Result<Vec<ParsedRecord>, AgentSessionError> {
+    let mut records = Vec::new();
+    for line in lines {
+        let record = parse_jsonl_record(line)?;
+        if let (Some(expected), Some(actual)) = (expected_session_id, record.session_id.as_deref())
+        {
+            if actual != expected {
+                continue;
+            }
+        }
+        if !matches!(record.event, ParsedEvent::Ignored) {
+            records.push(record);
+        }
+    }
+    let Some(current_message_id) = records.iter().rev().find_map(|record| {
+        matches!(
+            record.event,
+            ParsedEvent::Text(_)
+                | ParsedEvent::ToolActivity(_)
+                | ParsedEvent::StepStart
+                | ParsedEvent::StepFinish
+                | ParsedEvent::Error(_)
+        )
+        .then(|| record.message_id.as_deref())
+        .flatten()
+        .map(str::to_owned)
+    }) else {
+        return Ok(records);
+    };
+    Ok(records
+        .into_iter()
+        .filter(|record| {
+            record
+                .message_id
+                .as_deref()
+                .is_none_or(|message_id| message_id == current_message_id.as_str())
+        })
+        .collect())
+}
+
 fn has_structured_terminal_event(events: &[ReplyEvent]) -> bool {
     events
         .iter()
@@ -301,6 +413,7 @@ impl AgentSession for OpenCodeSession {
             .take()
             .ok_or_else(|| AgentSessionError::Io("stderr pipe indisponible".to_owned()))?;
 
+        let expected_session = self.conversation_id();
         let mut lines = BufReader::new(stdout).lines();
         let mut collected = Vec::new();
         while let Some(line) = lines
@@ -309,7 +422,12 @@ impl AgentSession for OpenCodeSession {
             .map_err(|e| AgentSessionError::Io(e.to_string()))?
         {
             if let Some(engine_id) = extract_session_id(&line)? {
-                self.capture_session_id(engine_id);
+                if expected_session
+                    .as_deref()
+                    .is_none_or(|expected| expected == engine_id)
+                {
+                    self.capture_session_id(engine_id);
+                }
             }
             collected.push(line);
         }
@@ -324,7 +442,8 @@ impl AgentSession for OpenCodeSession {
             .await
             .map_err(|e| AgentSessionError::Io(e.to_string()))?;
         let stderr = String::from_utf8_lossy(&stderr_bytes);
-        let parsed = parse_jsonl_turn(&collected);
+        let parsed_session = expected_session.or_else(|| self.conversation_id());
+        let parsed = parse_jsonl_turn_scoped(&collected, parsed_session.as_deref());
         if !status.success() {
             if let Ok(events) = parsed {
                 if has_structured_terminal_event(&events) {
@@ -410,21 +529,15 @@ mod tests {
     }
 
     #[test]
-    fn parse_jsonl_turn_accepts_tool_only_finished_turn() {
-        let events = parse_jsonl_turn(&[
+    fn parse_jsonl_turn_rejects_tool_only_finished_turn() {
+        let err = parse_jsonl_turn(&[
             r#"{"type":"step_start"}"#.to_owned(),
             r#"{"type":"step_finish"}"#.to_owned(),
         ])
-        .unwrap();
-        assert_eq!(
-            events,
-            vec![
-                ReplyEvent::Heartbeat,
-                ReplyEvent::Heartbeat,
-                ReplyEvent::Final {
-                    content: String::new()
-                }
-            ]
+        .unwrap_err();
+        assert!(
+            matches!(err, AgentSessionError::Decode(ref message) if message.contains("aucun final textuel exploitable")),
+            "tool-only turn must be actionable, not a fake empty success: {err:?}"
         );
     }
 
@@ -498,6 +611,64 @@ mod tests {
         assert_eq!(event, ParsedEvent::Error("panne réseau".to_owned()));
     }
 
+    #[test]
+    fn parse_jsonl_event_accepts_tool_use() {
+        let event = parse_jsonl_event(r#"{"type":"tool_use","part":{"tool":"bash"}}"#).unwrap();
+        assert_eq!(event, ParsedEvent::ToolActivity("bash".to_owned()));
+    }
+
+    #[test]
+    fn parse_jsonl_turn_keeps_latest_message_when_opencode_replays_history() {
+        let events = parse_jsonl_turn(&[
+            r#"{"type":"step_start","sessionID":"s1","part":{"messageID":"old","type":"step-start"}}"#
+                .to_owned(),
+            r#"{"type":"text","sessionID":"s1","part":{"messageID":"old","type":"text","text":"ancienne réponse"}}"#
+                .to_owned(),
+            r#"{"type":"step_finish","sessionID":"s1","part":{"messageID":"old","type":"step-finish"}}"#
+                .to_owned(),
+            r#"{"type":"step_start","sessionID":"s1","part":{"messageID":"new","type":"step-start"}}"#
+                .to_owned(),
+            r#"{"type":"text","sessionID":"s1","part":{"messageID":"new","type":"text","text":"réponse courante"}}"#
+                .to_owned(),
+            r#"{"type":"step_finish","sessionID":"s1","part":{"messageID":"new","type":"step-finish"}}"#
+                .to_owned(),
+        ])
+        .unwrap();
+        assert_eq!(
+            events.last(),
+            Some(&ReplyEvent::Final {
+                content: "réponse courante".to_owned()
+            })
+        );
+        assert!(
+            !events.iter().any(|event| matches!(
+                event,
+                ReplyEvent::TextDelta { text } if text.contains("ancienne")
+            )),
+            "replayed text from a previous message must not pollute the current final: {events:?}"
+        );
+    }
+
+    #[test]
+    fn parse_jsonl_turn_scoped_ignores_other_sessions_when_known() {
+        let events = parse_jsonl_turn_scoped(
+            &[
+                r#"{"type":"text","sessionID":"other","part":{"messageID":"m1","text":"pollution"}}"#
+                    .to_owned(),
+                r#"{"type":"text","sessionID":"current","part":{"messageID":"m2","text":"ok"}}"#
+                    .to_owned(),
+            ],
+            Some("current"),
+        )
+        .unwrap();
+        assert_eq!(
+            events.last(),
+            Some(&ReplyEvent::Final {
+                content: "ok".to_owned()
+            })
+        );
+    }
+
     #[cfg(unix)]
     struct TempDir(PathBuf);
 
@@ -674,4 +845,45 @@ printf '%s\n' '{{"type":"step_finish","sessionID":"seeded-engine"}}'
         );
         assert_eq!(argv.last(), Some(&"prompt"));
     }
+
+    #[cfg(unix)]
+    #[tokio::test]
+    async fn seeded_session_ignores_and_does_not_capture_other_session_events() {
+        let tmp = TempDir::new("ignore-other-session");
+        let script = tmp.path().join("opencode-fixture.sh");
+        fs::write(
+            &script,
+            r#"#!/bin/sh
+printf '%s\n' '{"type":"step_start","sessionID":"seeded-engine","part":{"messageID":"m1"}}'
+printf '%s\n' '{"type":"text","sessionID":"seeded-engine","part":{"messageID":"m1","text":"réponse seed"}}'
+printf '%s\n' '{"type":"step_finish","sessionID":"seeded-engine","part":{"messageID":"m1"}}'
+printf '%s\n' '{"type":"text","sessionID":"other-engine","part":{"messageID":"m2","text":"pollution"}}'
+"#,
+        )
+        .unwrap();
+        let mut permissions = fs::metadata(&script).unwrap().permissions();
+        permissions.set_mode(0o755);
+        fs::set_permissions(&script, permissions).unwrap();
+        let session = OpenCodeSession::new(
+            SessionId::new_random(),
+            script.to_string_lossy(),
+            Vec::new(),
+            tmp.path().to_string_lossy(),
+            Some("seeded-engine".to_owned()),
+            Vec::new(),
+            None,
+            None,
+        )
+        .unwrap();
+
+        let events = session.send("prompt").await.unwrap().collect::<Vec<_>>();
+
+        assert_eq!(
+            events.last(),
+            Some(&ReplyEvent::Final {
+                content: "réponse seed".to_owned()
+            })
+        );
+        assert_eq!(session.conversation_id().as_deref(), Some("seeded-engine"));
+    }
 }