fuzzy selectors for models and reasoning levels

1 files changed, 19 insertions, 0 deletions

diff --git a/libpanto/src/agent.zig b/libpanto/src/agent.zig
index 0252af6..24bc2cf 100644
--- a/libpanto/src/agent.zig
+++ b/libpanto/src/agent.zig
@@ -1162,6 +1162,25 @@ pub const Stream = struct {
         };
     }
 
+    /// Reset a `.failed` stream back to `.turn_start` so the caller can resume
+    /// `next()` after changing the agent config (e.g. an embedder that catches
+    /// a terminal `ProviderBadRequest`, rewrites the provider config, and
+    /// wants to retry the SAME turn without re-appending the user message).
+    ///
+    /// Safe only at the OPEN boundary: a failed open never mutates the
+    /// conversation, so the already-committed user prompt at `_start` stays
+    /// intact and the re-open re-reads the (now-swapped) config snapshot.
+    /// Returns `error.StreamNotFailed` if the stream is not in `.failed`.
+    pub fn reopen(self: *Stream) !void {
+        if (self.state != .failed) return error.StreamNotFailed;
+        if (self._response) |ps| {
+            ps.deinit();
+            self._response = null;
+        }
+        self._pending_error = null;
+        self.state = .turn_start;
+    }
+
     /// Pull the next event, or null past the terminal. See the contract
     /// above.
     pub fn next(self: *Stream) !?Event {