refactor(agent-runner): remove host context windowing

src/langbot/pkg/agent/runner/config_migration.py

@@ -114,6 +114,9 @@ class ConfigMigration:
         if old_runner_name:
             old_config = ai_config.get(old_runner_name, {})
             if old_config:
+                old_config = dict(old_config)
+                if runner_id == OLD_RUNNER_TO_PLUGIN_RUNNER_ID['local-agent']:
+                    old_config.pop('max-round', None)
                 return ConfigMigration.normalize_runner_config_for_migration(runner_id, old_config)
 
         return {}

src/langbot/pkg/agent/runner/context_builder.py

@@ -296,8 +296,6 @@ class AgentRunContextBuilder:
         adapter_context = {
             'query_id': None,
             'pipeline_uuid': binding.pipeline_uuid,
-            'max_round': binding.max_round,  # For reference only
-            'adapter_messages': [],
             'extra': {},
         }
 
@@ -316,7 +314,7 @@ class AgentRunContextBuilder:
             'state': state,
             'runtime': runtime,
             'config': binding.runner_config,
-            'bootstrap': None,  # Optional - no messages inlined by default
+            'bootstrap': None,
             'adapter': adapter_context,
             'metadata': {},  # Additional metadata
         }

src/langbot/pkg/agent/runner/event_log_store.py

@@ -11,7 +11,6 @@ from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession
 from sqlalchemy.orm import sessionmaker
 
 from ...entity.persistence.event_log import EventLog
-from ...entity.persistence.transcript import Transcript
 
 
 class EventLogStore:

src/langbot/pkg/agent/runner/host_models.py

@@ -8,8 +8,6 @@ import typing
 import pydantic
 
 from langbot_plugin.api.entities.builtin.agent_runner.event import (
-    AgentEventContext,
-    ConversationContext,
     ActorContext,
     SubjectContext,
     RawEventRef,
@@ -172,6 +170,3 @@ class AgentBinding(pydantic.BaseModel):
     # Fields for Pipeline adapter
     pipeline_uuid: str | None = None
     """Pipeline UUID (for Pipeline adapter)."""
-
-    max_round: int | None = None
-    """max-round (for Pipeline adapter bootstrap, not Protocol v1)."""

src/langbot/pkg/agent/runner/orchestrator.py

@@ -133,16 +133,6 @@ class AgentRunOrchestrator:
             # Merge prompt into adapter.extra for Pipeline adapter consumers.
             if 'prompt' in adapter_context:
                 context['adapter']['extra']['prompt'] = adapter_context['prompt']
-            # Merge bootstrap if provided
-            if adapter_context.get('bootstrap'):
-                context['bootstrap'] = adapter_context['bootstrap']
-                # Also expose the bootstrap window through adapter metadata.
-                bootstrap_messages = adapter_context['bootstrap'].get('messages')
-                if bootstrap_messages:
-                    context['adapter']['adapter_messages'] = bootstrap_messages
-            # Merge runtime metadata if provided
-            if adapter_context.get('runtime_metadata'):
-                context['runtime']['metadata'].update(adapter_context['runtime_metadata'])
             # Set query_id if provided
             if adapter_context.get('query_id'):
                 context['runtime']['query_id'] = adapter_context['query_id']

src/langbot/pkg/agent/runner/pipeline_adapter.py

@@ -29,7 +29,6 @@ from .host_models import (
     DeliveryPolicy,
 )
 from . import events as runner_events
-from ...pipeline.msgtrun.round_policy import select_max_round_messages
 
 
 class PipelineAdapter:
@@ -38,7 +37,6 @@ class PipelineAdapter:
     This adapter is responsible for:
     - Converting Query to AgentEventEnvelope
     - Converting Pipeline config to temporary AgentBinding
-    - Handling max-round as bootstrap policy
     - Putting Query-only fields into adapter context
     """
 
@@ -118,10 +116,6 @@ class PipelineAdapter:
         runner_config = ai_config.get('runner_config', {}).get(runner_id, {})
         pipeline_uuid = getattr(query, 'pipeline_uuid', None)
 
-        # Extract max_round for adapter (used in bootstrap, not Protocol v1)
-        # Note: config uses 'max-round' with hyphen, not 'max_round' with underscore
-        max_round = runner_config.get('max-round') or ai_config.get('max-round')
-
         # Build scope
         scope = BindingScope(
             scope_type="pipeline",
@@ -158,45 +152,8 @@ class PipelineAdapter:
             delivery_policy=delivery_policy,
             enabled=True,
             pipeline_uuid=pipeline_uuid,
-            max_round=max_round,
         )
 
-    @classmethod
-    def build_bootstrap_context(
-        cls,
-        query: pipeline_query.Query,
-        binding: AgentBinding,
-    ) -> tuple[dict[str, typing.Any] | None, dict[str, typing.Any]]:
-        """Build bootstrap messages and runtime metadata for Pipeline max-round."""
-        max_round = binding.max_round
-        source_messages = query.messages or []
-        if not max_round or max_round <= 0 or not source_messages:
-            return None, {}
-
-        packaged_messages = select_max_round_messages(source_messages, max_round)
-        bootstrap_messages = [cls._dump_message(msg) for msg in packaged_messages]
-        bootstrap = {
-            "messages": bootstrap_messages,
-            "summary": None,
-            "artifacts": [],
-            "metadata": {},
-        }
-        runtime_metadata = {
-            'context_packaging': {
-                'policy': {
-                    'mode': 'max_round',
-                    'max_round': max_round,
-                },
-                'history': {
-                    'source': 'query.messages',
-                    'source_total_count': len(source_messages),
-                    'delivered_count': len(packaged_messages),
-                    'messages_complete': len(packaged_messages) == len(source_messages),
-                },
-            },
-        }
-        return bootstrap, runtime_metadata
-
     @classmethod
     def build_adapter_context(
         cls,
@@ -204,13 +161,10 @@ class PipelineAdapter:
         binding: AgentBinding,
     ) -> dict[str, typing.Any]:
         """Build Query-derived fields for the Pipeline adapter entry."""
-        bootstrap, runtime_metadata = cls.build_bootstrap_context(query, binding)
         return {
             'params': cls.build_params(query),
             'prompt': cls.build_prompt(query),
-            'bootstrap': bootstrap,
             'query_id': getattr(query, 'query_id', None),
-            'runtime_metadata': runtime_metadata,
         }
 
     @classmethod