From ed001f2409ef671a9d398d4aecdf259c9957cfb3 Mon Sep 17 00:00:00 2001
From: Evan Quiney <evanev7@gmail.com>
Date: Thu, 19 Feb 2026 18:23:28 +0000
Subject: [PATCH] remove prefillprogress event (#1550)

this should never have been a separate event, but i didnt quite
communicate that well when this was merged. convert PrefillProgress to a
chunk like the rest of the runner responses.

tested with Llama-3.3-70B, prefill progress events still show up in the
dashboard as usual
---
 src/exo/master/api.py           | 17 -----------------
 src/exo/shared/apply.py         |  2 --
 src/exo/shared/types/events.py  | 10 +---------
 src/exo/worker/runner/runner.py | 19 +++++++++++++------
 4 files changed, 14 insertions(+), 34 deletions(-)

diff --git a/src/exo/master/api.py b/src/exo/master/api.py
index c3811072..319a8164 100644
--- a/src/exo/master/api.py
+++ b/src/exo/master/api.py
@@ -138,7 +138,6 @@ from exo.shared.types.events import (
     Event,
     ForwarderEvent,
     IndexedEvent,
-    PrefillProgress,
     TracesMerged,
 )
 from exo.shared.types.memory import Memory
@@ -1455,22 +1454,6 @@ class API:
                                 await queue.send(event.chunk)
                             except BrokenResourceError:
                                 self._text_generation_queues.pop(event.command_id, None)
-
-                    elif isinstance(event, PrefillProgress):
-                        if queue := self._text_generation_queues.get(
-                            event.command_id, None
-                        ):
-                            try:
-                                await queue.send(
-                                    PrefillProgressChunk(
-                                        model=event.model,
-                                        processed_tokens=event.processed_tokens,
-                                        total_tokens=event.total_tokens,
-                                    )
-                                )
-                            except BrokenResourceError:
-                                self._text_generation_queues.pop(event.command_id, None)
-
                     if isinstance(event, TracesMerged):
                         self._save_merged_trace(event)
 
diff --git a/src/exo/shared/apply.py b/src/exo/shared/apply.py
index ee5b2229..94869dfe 100644
--- a/src/exo/shared/apply.py
+++ b/src/exo/shared/apply.py
@@ -15,7 +15,6 @@ from exo.shared.types.events import (
     NodeDownloadProgress,
     NodeGatheredInfo,
     NodeTimedOut,
-    PrefillProgress,
     RunnerDeleted,
     RunnerStatusUpdated,
     TaskAcknowledged,
@@ -65,7 +64,6 @@ def event_apply(event: Event, state: State) -> State:
             | ChunkGenerated()
             | TaskAcknowledged()
             | InputChunkReceived()
-            | PrefillProgress()
             | TracesCollected()
             | TracesMerged()
         ):  # Pass-through events that don't modify state
diff --git a/src/exo/shared/types/events.py b/src/exo/shared/types/events.py
index 83e162ab..5cf93d0c 100644
--- a/src/exo/shared/types/events.py
+++ b/src/exo/shared/types/events.py
@@ -5,7 +5,7 @@ from pydantic import Field
 
 from exo.shared.topology import Connection
 from exo.shared.types.chunks import GenerationChunk, InputImageChunk
-from exo.shared.types.common import CommandId, Id, ModelId, NodeId, SessionId
+from exo.shared.types.common import CommandId, Id, NodeId, SessionId
 from exo.shared.types.tasks import Task, TaskId, TaskStatus
 from exo.shared.types.worker.downloads import DownloadProgress
 from exo.shared.types.worker.instances import Instance, InstanceId
@@ -102,13 +102,6 @@ class InputChunkReceived(BaseEvent):
     chunk: InputImageChunk
 
 
-class PrefillProgress(BaseEvent):
-    command_id: CommandId
-    model: ModelId
-    processed_tokens: int
-    total_tokens: int
-
-
 class TopologyEdgeCreated(BaseEvent):
     conn: Connection
 
@@ -155,7 +148,6 @@ Event = (
     | NodeDownloadProgress
     | ChunkGenerated
     | InputChunkReceived
-    | PrefillProgress
     | TopologyEdgeCreated
     | TopologyEdgeDeleted
     | TracesCollected
diff --git a/src/exo/worker/runner/runner.py b/src/exo/worker/runner/runner.py
index 2dc340c3..51950192 100644
--- a/src/exo/worker/runner/runner.py
+++ b/src/exo/worker/runner/runner.py
@@ -21,12 +21,17 @@ from exo.shared.constants import EXO_MAX_CHUNK_SIZE, EXO_TRACING_ENABLED
 from exo.shared.models.model_cards import ModelId, ModelTask
 from exo.shared.tracing import clear_trace_buffer, get_trace_buffer
 from exo.shared.types.api import ImageGenerationStats
-from exo.shared.types.chunks import ErrorChunk, ImageChunk, TokenChunk, ToolCallChunk
+from exo.shared.types.chunks import (
+    ErrorChunk,
+    ImageChunk,
+    PrefillProgressChunk,
+    TokenChunk,
+    ToolCallChunk,
+)
 from exo.shared.types.common import CommandId
 from exo.shared.types.events import (
     ChunkGenerated,
     Event,
-    PrefillProgress,
     RunnerStatusUpdated,
     TaskAcknowledged,
     TaskStatusUpdated,
@@ -315,11 +320,13 @@ def main(
                     ) -> None:
                         if device_rank == 0:
                             event_sender.send(
-                                PrefillProgress(
+                                ChunkGenerated(
                                     command_id=command_id,
-                                    model=shard_metadata.model_card.model_id,
-                                    processed_tokens=processed,
-                                    total_tokens=total,
+                                    chunk=PrefillProgressChunk(
+                                        model=shard_metadata.model_card.model_id,
+                                        processed_tokens=processed,
+                                        total_tokens=total,
+                                    ),
                                 )
                             )
                         cancelled_tasks.update(cancel_receiver.collect())