save request payload on any API error, not just timeouts

Serialize request JSON before send_and_check so it's available
for both HTTP errors and stream errors. Extracted save logic
into save_failed_request helper on SseReader.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/agent/api/mod.rs

@@ -192,6 +192,7 @@ pub(crate) async fn send_and_check(
     extra_headers: &[(&str, &str)],
     ui_tx: &UiSender,
     debug_label: &str,
+    request_json: Option<&str>,
 ) -> Result<reqwest::Response> {
     let debug = std::env::var("POC_DEBUG").is_ok();
     let start = Instant::now();
@@ -262,6 +263,18 @@ pub(crate) async fn send_and_check(
             url,
             &body[..body.len().min(500)]
         )));
+        if let Some(json) = request_json {
+            let log_dir = dirs::home_dir()
+                .unwrap_or_default()
+                .join(".consciousness/logs");
+            let ts = chrono::Local::now().format("%Y%m%dT%H%M%S");
+            let path = log_dir.join(format!("failed-request-{}.json", ts));
+            if std::fs::write(&path, json).is_ok() {
+                let _ = ui_tx.send(UiMessage::Debug(format!(
+                    "saved failed request to {} (HTTP {})", path.display(), status
+                )));
+            }
+        }
         anyhow::bail!("HTTP {} ({}): {}", status, url, &body[..body.len().min(1000)]);
     }
 
@@ -291,8 +304,8 @@ pub(crate) struct SseReader {
     debug: bool,
     ui_tx: UiSender,
     done: bool,
-    /// Serialized request payload — saved to disk on timeout for replay debugging.
+    /// Serialized request payload — saved to disk on errors for replay debugging.
-    request_json: Option<String>,
+    pub(crate) request_json: Option<String>,
 }
 
 impl SseReader {
@@ -312,8 +325,19 @@ impl SseReader {
     }
 
     /// Attach the serialized request payload for error diagnostics.
-    pub fn set_request(&mut self, request: &impl serde::Serialize) {
+    /// Save the request payload to disk for replay debugging.
-        self.request_json = serde_json::to_string_pretty(request).ok();
+    fn save_failed_request(&self, reason: &str) {
+        let Some(ref json) = self.request_json else { return };
+        let log_dir = dirs::home_dir()
+            .unwrap_or_default()
+            .join(".consciousness/logs");
+        let ts = chrono::Local::now().format("%Y%m%dT%H%M%S");
+        let path = log_dir.join(format!("failed-request-{}.json", ts));
+        if std::fs::write(&path, json).is_ok() {
+            let _ = self.ui_tx.send(UiMessage::Debug(format!(
+                "saved failed request to {} ({})", path.display(), reason
+            )));
+        }
     }
 
     /// Read the next SSE event from the response stream.
@@ -374,27 +398,19 @@ impl SseReader {
                     self.line_buf.push_str(&String::from_utf8_lossy(&chunk));
                 }
                 Ok(Ok(None)) => return Ok(None),
-                Ok(Err(e)) => return Err(e.into()),
+                Ok(Err(e)) => {
+                    self.save_failed_request(&format!("stream error: {}", e));
+                    return Err(e.into());
+                }
                 Err(_) => {
-                    let _ = self.ui_tx.send(UiMessage::Debug(format!(
+                    let msg = format!(
-                        "TIMEOUT: no data for {}s ({} chunks, {:.1}s elapsed)",
+                        "stream timeout: no data for {}s ({} chunks, {:.1}s elapsed)",
                         self.chunk_timeout.as_secs(),
                         self.chunks_received,
                         self.stream_start.elapsed().as_secs_f64()
-                    )));
+                    );
-                    // Save the request for replay debugging
+                    let _ = self.ui_tx.send(UiMessage::Debug(msg.clone()));
-                    if let Some(ref json) = self.request_json {
+                    self.save_failed_request(&msg);
-                        let log_dir = dirs::home_dir()
-                            .unwrap_or_default()
-                            .join(".consciousness/logs");
-                        let ts = chrono::Local::now().format("%Y%m%dT%H%M%S");
-                        let path = log_dir.join(format!("failed-request-{}.json", ts));
-                        if std::fs::write(&path, json).is_ok() {
-                            let _ = self.ui_tx.send(UiMessage::Debug(format!(
-                                "saved failed request to {}", path.display()
-                            )));
-                        }
-                    }
                     anyhow::bail!(
                         "stream timeout: no data for {}s ({} chunks received)",
                         self.chunk_timeout.as_secs(),

src/agent/api/openai.rs

@@ -55,6 +55,7 @@ pub async fn stream_events(
         None => String::new(),
     };
     let debug_label = format!("{} messages, model={}{}", msg_count, model, pri_label);
+    let request_json = serde_json::to_string_pretty(&request).ok();
 
     let mut response = super::send_and_check(
         client,
@@ -64,11 +65,12 @@ pub async fn stream_events(
         &[],
         ui_tx,
         &debug_label,
+        request_json.as_deref(),
     )
     .await?;
 
     let mut reader = super::SseReader::new(ui_tx);
-    reader.set_request(&request);
+    reader.request_json = request_json;
 
     let mut content_len: usize = 0;
     let mut reasoning_chars: usize = 0;