From 5c20b9bb327eb026ce1d3c027ff28702e2036b68 Mon Sep 17 00:00:00 2001
From: w4ffl35 <25737761+w4ffl35@users.noreply.github.com>
Date: Wed, 16 Sep 2026 05:17:54 -0600
Subject: [PATCH] Correct the frame-list type on the pipeline runner's node
 input

_node_input is annotated Tuple[List[float], bool], but it returns a list of frames, not a list of floats: the no-incoming-edge branch returns frames_from(), which is List[Any], and the other branch wraps a single extracted vector as [frame]. mypy caught the mismatch and the lint job has been failing on main since 60763a2.

Only the annotation was wrong. The runtime shape is correct and unchanged -- ServingService.predict consumes a list of frames, and a single-node graph run returns a prediction end to end.

Verified: mypy clean across all 413 source files, ruff clean, and the four pipeline test files pass (33 passed).
---
 spikeforge_serve/pipeline_runner.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/spikeforge_serve/pipeline_runner.py b/spikeforge_serve/pipeline_runner.py
index 77fd74f..0348c7f 100644
--- a/spikeforge_serve/pipeline_runner.py
+++ b/spikeforge_serve/pipeline_runner.py
@@ -112,8 +112,14 @@ def _node_input(
     incoming: List[PipelineEdge],
     results: Dict[str, Dict[str, Any]],
     service: ServingService,
-) -> Tuple[List[float], bool]:
-    """Return the ``(frames, encoded)`` input for one node."""
+) -> Tuple[List[Any], bool]:
+    """Return the ``(frames, encoded)`` input for one node.
+
+    The first element is a list of *frames*, matching what ``frames_from``
+    yields and what ``ServingService.predict`` consumes. An upstream node
+    contributes exactly one frame, so its vector is wrapped rather than
+    spread.
+    """
     if not incoming:
         return frames_from(ctx.request), encoded_flag(ctx.request)
     edge = incoming[0]