diff --git a/docs/agent-runner-pluginization/PROTOCOL_V1.md b/docs/agent-runner-pluginization/PROTOCOL_V1.md
index a6f7a2eb..dda2ee44 100644
--- a/docs/agent-runner-pluginization/PROTOCOL_V1.md
+++ b/docs/agent-runner-pluginization/PROTOCOL_V1.md
@@ -89,6 +89,8 @@ class AgentRunnerCapabilities(BaseModel):
     tool_calling: bool = False
     knowledge_retrieval: bool = False
     multimodal_input: bool = False
+    skill_authoring: bool = False
+    skill_injection: bool = False
     event_context: bool = True
     platform_api: bool = False
     interrupt: bool = False
@@ -102,6 +104,8 @@ class AgentRunnerCapabilities(BaseModel):
 - `tool_calling`: runner 可能调用 Host tool API。
 - `knowledge_retrieval`: runner 可能调用 Host knowledge API。
 - `multimodal_input`: runner 可以处理非纯文本 input / artifact。
+- `skill_authoring`: runner 需要 Host 提供的 skill authoring tools。
+- `skill_injection`: runner 需要 Host 在 effective prompt 中注入 skill index。
 - `event_context`: runner 理解 event-first 输入。
 - `platform_api`: runner 可能请求平台动作。
 - `interrupt`: runner 支持取消或中断。
diff --git a/src/langbot/pkg/agent/runner/config_schema.py b/src/langbot/pkg/agent/runner/config_schema.py
index 430d2d5e..b09d25fd 100644
--- a/src/langbot/pkg/agent/runner/config_schema.py
+++ b/src/langbot/pkg/agent/runner/config_schema.py
@@ -64,6 +64,20 @@ def uses_host_knowledge_bases(descriptor: AgentRunnerDescriptor | None) -> bool:
     )
 
 
+def supports_skill_authoring(descriptor: AgentRunnerDescriptor | None) -> bool:
+    """Return whether the runner wants Host skill-authoring tools."""
+    if descriptor is None:
+        return False
+    return bool(descriptor.capabilities.get('skill_authoring', False))
+
+
+def supports_skill_injection(descriptor: AgentRunnerDescriptor | None) -> bool:
+    """Return whether the runner wants the Host skill index in the effective prompt."""
+    if descriptor is None:
+        return False
+    return bool(descriptor.capabilities.get('skill_injection', False))
+
+
 def extract_prompt_config(
     descriptor: AgentRunnerDescriptor | None,
     runner_config: dict[str, typing.Any],
diff --git a/src/langbot/pkg/agent/runner/orchestrator.py b/src/langbot/pkg/agent/runner/orchestrator.py
index 97092452..6fd934a6 100644
--- a/src/langbot/pkg/agent/runner/orchestrator.py
+++ b/src/langbot/pkg/agent/runner/orchestrator.py
@@ -137,6 +137,8 @@ class AgentRunOrchestrator:
             # Merge params into adapter.extra
             if 'params' in adapter_context:
                 context['adapter']['extra']['params'] = adapter_context['params']
+            if adapter_context.get('prompt_get'):
+                context['context']['available_apis']['prompt_get'] = True
 
         # Build state context for State API handlers
         state_context = build_state_context(event, binding, descriptor)
diff --git a/src/langbot/pkg/agent/runner/query_entry_adapter.py b/src/langbot/pkg/agent/runner/query_entry_adapter.py
index 9591de72..b5d9a65e 100644
--- a/src/langbot/pkg/agent/runner/query_entry_adapter.py
+++ b/src/langbot/pkg/agent/runner/query_entry_adapter.py
@@ -148,6 +148,7 @@ class QueryEntryAdapter:
         return {
             'params': cls.build_params(query),
             'query_id': getattr(query, 'query_id', None),
+            'prompt_get': cls._has_effective_prompt(query),
         }
 
     @classmethod
@@ -185,6 +186,12 @@ class QueryEntryAdapter:
             )
         return False
 
+    @classmethod
+    def _has_effective_prompt(cls, query: pipeline_query.Query) -> bool:
+        prompt = getattr(query, 'prompt', None)
+        messages = getattr(prompt, 'messages', None) if prompt is not None else None
+        return isinstance(messages, list)
+
     # Private helper methods
 
     @classmethod
@@ -374,24 +381,18 @@ class QueryEntryAdapter:
             content = getattr(user_message, 'content', None)
             if isinstance(content, list):
                 for elem in content:
-                    # Handle both real objects and mocks
+                    elem_dict = None
                     if hasattr(elem, 'model_dump'):
-                        contents.append(elem.model_dump(mode='json'))
+                        elem_dict = elem.model_dump(mode='json')
                     elif isinstance(elem, dict):
-                        contents.append(elem)
-                    else:
-                        # For mocks, extract type and text attributes
-                        elem_type = getattr(elem, 'type', None)
-                        if elem_type == 'text':
-                            elem_text = getattr(elem, 'text', None)
-                            contents.append({'type': 'text', 'text': elem_text})
-                            if elem_text:
-                                text_parts.append(elem_text)
+                        elem_dict = elem
+
+                    if not isinstance(elem_dict, dict):
                         continue
 
-                    # Extract text for the text field
-                    if hasattr(elem, 'type') and getattr(elem, 'type', None) == 'text':
-                        elem_text = getattr(elem, 'text', None)
+                    contents.append(elem_dict)
+                    if elem_dict.get('type') == 'text':
+                        elem_text = elem_dict.get('text')
                         if elem_text:
                             text_parts.append(elem_text)
             elif content is not None:
@@ -466,36 +467,37 @@ class QueryEntryAdapter:
         message_chain = getattr(query, 'message_chain', None)
         if message_chain:
             try:
-                for component in message_chain:
-                    artifact_id = str(uuid.uuid4())  # Generate unique ID
-
-                    if isinstance(component, platform_message.Image):
-                        attachments.append({
-                            'artifact_id': artifact_id,
-                            'artifact_type': 'image',
-                            'source': 'message_chain',
-                            'id': component.image_id or None,
-                            'url': component.url or None,
-                        })
-                    elif isinstance(component, platform_message.File):
-                        attachments.append({
-                            'artifact_id': artifact_id,
-                            'artifact_type': 'file',
-                            'source': 'message_chain',
-                            'id': component.id or None,
-                            'name': component.name or None,
-                        })
-                    elif isinstance(component, platform_message.Voice):
-                        attachments.append({
-                            'artifact_id': artifact_id,
-                            'artifact_type': 'voice',
-                            'source': 'message_chain',
-                            'id': component.voice_id or None,
-                            'url': component.url or None,
-                        })
+                message_components = iter(message_chain)
             except TypeError:
-                # message_chain is not iterable (e.g., a Mock object)
-                pass
+                message_components = iter(())
+
+            for component in message_components:
+                artifact_id = str(uuid.uuid4())  # Generate unique ID
+
+                if isinstance(component, platform_message.Image):
+                    attachments.append({
+                        'artifact_id': artifact_id,
+                        'artifact_type': 'image',
+                        'source': 'message_chain',
+                        'id': component.image_id or None,
+                        'url': component.url or None,
+                    })
+                elif isinstance(component, platform_message.File):
+                    attachments.append({
+                        'artifact_id': artifact_id,
+                        'artifact_type': 'file',
+                        'source': 'message_chain',
+                        'id': component.id or None,
+                        'name': component.name or None,
+                    })
+                elif isinstance(component, platform_message.Voice):
+                    attachments.append({
+                        'artifact_id': artifact_id,
+                        'artifact_type': 'voice',
+                        'source': 'message_chain',
+                        'id': component.voice_id or None,
+                        'url': component.url or None,
+                    })
 
         return attachments
 
diff --git a/src/langbot/pkg/agent/runner/transcript_store.py b/src/langbot/pkg/agent/runner/transcript_store.py
index ef18115f..b1d7487b 100644
--- a/src/langbot/pkg/agent/runner/transcript_store.py
+++ b/src/langbot/pkg/agent/runner/transcript_store.py
@@ -11,6 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession
 from sqlalchemy.orm import sessionmaker
 
 from ...entity.persistence.transcript import Transcript
+from langbot_plugin.api.entities.builtin.provider import message as provider_message
 
 
 class TranscriptStore:
@@ -225,6 +226,30 @@ class TranscriptStore:
                 return None
             return str(row)
 
+    async def get_legacy_provider_messages(
+        self,
+        conversation_id: str,
+        limit: int = HARD_LIMIT,
+    ) -> list[provider_message.Message]:
+        """Project Transcript rows into the legacy provider Message view.
+
+        AgentRunner history is canonical in Transcript. This view exists for
+        legacy Pipeline readers such as PromptPreProcessing that still expect
+        query.messages.
+        """
+        items, _, _, _ = await self.page_transcript(
+            conversation_id=conversation_id,
+            limit=limit,
+            direction="backward",
+        )
+
+        messages: list[provider_message.Message] = []
+        for item in reversed(items):
+            message = self._transcript_item_to_provider_message(item)
+            if message is not None:
+                messages.append(message)
+        return messages
+
     async def has_history_before(
         self,
         conversation_id: str,
@@ -288,3 +313,29 @@ class TranscriptStore:
             result['artifact_refs'] = []
 
         return result
+
+    def _transcript_item_to_provider_message(
+        self,
+        item: dict[str, typing.Any],
+    ) -> provider_message.Message | None:
+        """Convert one Transcript API item into a provider Message."""
+        if item.get('item_type') != 'message':
+            return None
+
+        role = item.get('role')
+        if role not in {'user', 'assistant'}:
+            return None
+
+        content_json = item.get('content_json')
+        if isinstance(content_json, dict):
+            message_data = dict(content_json)
+            message_data['role'] = role
+            try:
+                return provider_message.Message.model_validate(message_data)
+            except Exception:
+                pass
+
+        content = item.get('content')
+        if content is None:
+            return None
+        return provider_message.Message(role=role, content=content)
diff --git a/src/langbot/pkg/pipeline/preproc/preproc.py b/src/langbot/pkg/pipeline/preproc/preproc.py
index 13265530..b223e438 100644
--- a/src/langbot/pkg/pipeline/preproc/preproc.py
+++ b/src/langbot/pkg/pipeline/preproc/preproc.py
@@ -19,8 +19,6 @@ DEFAULT_PROMPT_CONFIG = [
     {'role': 'system', 'content': 'You are a helpful assistant.'},
 ]
 
-LOCAL_AGENT_RUNNER_ID = 'plugin:langbot/local-agent/default'
-
 
 @stage.stage_class('PreProcessor')
 class PreProcessor(stage.PipelineStage):
@@ -107,6 +105,48 @@ class PreProcessor(stage.PipelineStage):
             if isinstance(msg.content, list):
                 msg.content = [elem for elem in msg.content if elem.type != 'image_url']
 
+    def _has_declared_db_engine(self) -> bool:
+        persistence_mgr = getattr(self.ap, 'persistence_mgr', None)
+        if persistence_mgr is None:
+            return False
+        if 'get_db_engine' in getattr(persistence_mgr, '__dict__', {}):
+            return True
+        return hasattr(type(persistence_mgr), 'get_db_engine')
+
+    async def _load_agent_runner_history_messages(
+        self,
+        runner_id: str | None,
+        conversation_uuid: str | None,
+    ) -> list[provider_message.Message] | None:
+        if not runner_id or not conversation_uuid or not self._has_declared_db_engine():
+            return None
+
+        try:
+            from ...agent.runner.transcript_store import TranscriptStore
+
+            store = TranscriptStore(self.ap.persistence_mgr.get_db_engine())
+            messages = await store.get_legacy_provider_messages(str(conversation_uuid))
+        except Exception as e:
+            self.ap.logger.warning(
+                f'Unable to load Transcript history view for conversation {conversation_uuid}: {e}'
+            )
+            return None
+
+        return messages or None
+
+    async def _resolve_history_messages(
+        self,
+        runner_id: str | None,
+        conversation: typing.Any,
+    ) -> list[provider_message.Message]:
+        transcript_messages = await self._load_agent_runner_history_messages(
+            runner_id,
+            getattr(conversation, 'uuid', None),
+        )
+        if transcript_messages is not None:
+            return transcript_messages
+        return conversation.messages.copy()
+
     async def process(
         self,
         query: pipeline_query.Query,
@@ -127,8 +167,11 @@ class PreProcessor(stage.PipelineStage):
 
         uses_host_models = config_schema.uses_host_models(descriptor)
         uses_host_tools = config_schema.uses_host_tools(descriptor)
-        is_local_agent = runner_id == LOCAL_AGENT_RUNNER_ID
-        include_skill_authoring = is_local_agent and getattr(self.ap, 'skill_service', None) is not None
+        include_skill_authoring = (
+            config_schema.supports_skill_authoring(descriptor)
+            and getattr(self.ap, 'skill_service', None) is not None
+        )
+        inject_skill_context = config_schema.supports_skill_injection(descriptor)
         llm_model = None
         if uses_host_models:
             primary_uuid, fallback_uuids = config_schema.extract_model_selection(descriptor, runner_config)
@@ -171,7 +214,7 @@ class PreProcessor(stage.PipelineStage):
         # 设置query
         query.session = session
         query.prompt = conversation.prompt.copy()
-        query.messages = conversation.messages.copy()
+        query.messages = await self._resolve_history_messages(runner_id, conversation)
 
         if uses_host_models:
             query.use_funcs = []
@@ -307,7 +350,7 @@ class PreProcessor(stage.PipelineStage):
         query.prompt.messages = event_ctx.event.default_prompt
         query.messages = event_ctx.event.prompt
 
-        # =========== Skill awareness for the local-agent runner ===========
+        # =========== Skill awareness for capable runners ===========
         # The actual activation goes through the ``activate`` Tool Call so the
         # LLM doesn't see full SKILL.md instructions until it commits to a
         # skill (Claude Code's progressive disclosure). But the LLM still has
@@ -319,7 +362,7 @@ class PreProcessor(stage.PipelineStage):
         #      only) into the system prompt. The contributor's original PR
         #      relied on this injection; without it the LLM never discovers
         #      the skills are there and just calls native tools instead.
-        if is_local_agent and self.ap.skill_mgr:
+        if inject_skill_context and self.ap.skill_mgr:
             pipeline_data = await self.ap.pipeline_service.get_pipeline(query.pipeline_uuid)
             extensions_prefs = (pipeline_data or {}).get('extensions_preferences', {})
             enable_all_skills = extensions_prefs.get('enable_all_skills', True)
diff --git a/src/langbot/pkg/pipeline/process/handlers/chat.py b/src/langbot/pkg/pipeline/process/handlers/chat.py
index 34eea9bf..c12d3b38 100644
--- a/src/langbot/pkg/pipeline/process/handlers/chat.py
+++ b/src/langbot/pkg/pipeline/process/handlers/chat.py
@@ -146,10 +146,11 @@ class ChatMessageHandler(handler.MessageHandler):
                         f'Conversation({query.query_id}) Streaming completed: {chunk_count} chunks, {text_length} chars'
                     )
 
-                # Update conversation history
-                conversation = await self._ensure_conversation_for_history(query)
-                conversation.messages.append(query.user_message)
-                conversation.messages.extend(query.resp_messages)
+                # Keep a conversation object available for downstream legacy
+                # readers, but do not mirror AgentRunner history into
+                # conversation.messages. TranscriptStore is the canonical
+                # history source for this path.
+                await self._ensure_conversation_for_history(query)
 
             except Exception as e:
                 # Import orchestrator errors for specific handling
diff --git a/src/langbot/pkg/plugin/handler.py b/src/langbot/pkg/plugin/handler.py
index f9cfe5f4..2fb78cb0 100644
--- a/src/langbot/pkg/plugin/handler.py
+++ b/src/langbot/pkg/plugin/handler.py
@@ -368,6 +368,25 @@ def _resolve_remove_think(data: dict[str, Any], query: Any | None) -> bool:
     return False
 
 
+def _dump_prompt_messages(query: Any) -> list[dict[str, Any]]:
+    """Serialize the current effective prompt from a cached Query."""
+    prompt = getattr(query, 'prompt', None)
+    messages = getattr(prompt, 'messages', None) if prompt is not None else None
+    if not isinstance(messages, list):
+        return []
+
+    dumped: list[dict[str, Any]] = []
+    for message in messages:
+        if hasattr(message, 'model_dump'):
+            try:
+                dumped.append(message.model_dump(mode='json'))
+            except TypeError:
+                dumped.append(message.model_dump())
+        elif isinstance(message, dict):
+            dumped.append(message)
+    return dumped
+
+
 def _merge_model_extra_args(model: Any, call_extra_args: Any) -> dict[str, Any]:
     """Merge persisted model extra_args with action-level overrides."""
     merged: dict[str, Any] = {}
@@ -787,17 +806,21 @@ class RuntimeConnectionHandler(handler.Handler):
 
             For AgentRunner calls: requires run_id and validates tool_name against session.resources.tools.
             For regular plugin calls: no run_id, unrestricted access (backward compatibility).
-
-            Note: SDK LangBotAPIProxy (legacy) sends 'tool_parameters' and expects 'tool_response'.
-            SDK AgentRunAPIProxy sends 'parameters' and expects 'result'.
-            Handler returns both for backward compatibility.
             """
             tool_name = data['tool_name']
-            # Support 'tool_parameters' (LangBotAPIProxy) and 'parameters' (AgentRunAPIProxy)
-            parameters = data.get('tool_parameters') or data.get('parameters', {})
             run_id = data.get('run_id')  # Optional: present for AgentRunner calls
             caller_plugin_identity = data.get('caller_plugin_identity')  # Optional: for cross-plugin validation
             session = None
+            is_agent_runner_call = bool(run_id)
+
+            if is_agent_runner_call:
+                if 'parameters' not in data:
+                    return handler.ActionResponse.error(
+                        message='parameters is required for AgentRunner tool calls',
+                    )
+                parameters = data.get('parameters') or {}
+            else:
+                parameters = data.get('tool_parameters') or {}
 
             # Permission validation for AgentRunner calls
             if run_id:
@@ -817,14 +840,9 @@ class RuntimeConnectionHandler(handler.Handler):
                     parameters=parameters,
                     query=query,
                 )
-                # Return both 'tool_response' (LangBotAPIProxy) and 'result' (AgentRunAPIProxy)
-                # LangBotAPIProxy expects 'tool_response', AgentRunAPIProxy expects 'result'
-                return handler.ActionResponse.success(
-                    data={
-                        'tool_response': result,
-                        'result': result,  # backward compatibility
-                    },
-                )
+                if is_agent_runner_call:
+                    return handler.ActionResponse.success(data={'result': result})
+                return handler.ActionResponse.success(data={'tool_response': result})
             except Exception as e:
                 traceback.print_exc()
                 return handler.ActionResponse.error(
@@ -1430,6 +1448,32 @@ class RuntimeConnectionHandler(handler.Handler):
 
         # ================= Agent History/Event APIs =================
 
+        @self.action(PluginToRuntimeAction.PROMPT_GET)
+        async def prompt_get(data: dict[str, Any]) -> handler.ActionResponse:
+            """Return the post-preprocessing effective prompt for a query-backed run."""
+            run_id = data.get('run_id')
+            caller_plugin_identity = data.get('caller_plugin_identity')
+
+            if not run_id:
+                return handler.ActionResponse.error(message='run_id is required')
+
+            session, error = await _validate_agent_run_session(
+                run_id,
+                caller_plugin_identity,
+                self.ap,
+                'Prompt get',
+            )
+            if error:
+                return error
+
+            query = _resolve_action_query(data, session, self.ap)
+            if query is None:
+                return handler.ActionResponse.error(
+                    message='Prompt get is only available for query-backed agent runs',
+                )
+
+            return handler.ActionResponse.success(data={'prompt': _dump_prompt_messages(query)})
+
         @self.action(PluginToRuntimeAction.HISTORY_PAGE)
         async def history_page(data: dict[str, Any]) -> handler.ActionResponse:
             """Page through transcript history for a conversation.
diff --git a/tests/unit_tests/agent/test_chat_handler.py b/tests/unit_tests/agent/test_chat_handler.py
index 602296a5..c3f62550 100644
--- a/tests/unit_tests/agent/test_chat_handler.py
+++ b/tests/unit_tests/agent/test_chat_handler.py
@@ -408,8 +408,8 @@ class TestChatHandlerAsyncBehavior:
         assert query.resp_messages[1].content == 'Response 2'
 
     @pytest.mark.asyncio
-    async def test_history_update_recreates_conversation_if_tool_resets_it(self):
-        """History update should tolerate CREATE_NEW_CONVERSATION during runner execution."""
+    async def test_agent_turn_recreates_conversation_if_tool_resets_it(self):
+        """Agent turn bookkeeping should tolerate CREATE_NEW_CONVERSATION during runner execution."""
         from langbot.pkg.pipeline.process.handlers.chat import ChatMessageHandler
         from langbot.pkg.pipeline import entities
 
@@ -449,7 +449,7 @@ class TestChatHandlerAsyncBehavior:
         assert results[0].result_type == entities.ResultType.CONTINUE
         mock_ap.sess_mgr.get_conversation.assert_awaited_once()
         assert query.session.using_conversation is new_conversation
-        assert new_conversation.messages == [query.user_message, response]
+        assert new_conversation.messages == []
 
     @pytest.mark.asyncio
     async def test_runner_not_found_error(self):
diff --git a/tests/unit_tests/agent/test_context_builder_params_state.py b/tests/unit_tests/agent/test_context_builder_params_state.py
index 05e868eb..711a1c9b 100644
--- a/tests/unit_tests/agent/test_context_builder_params_state.py
+++ b/tests/unit_tests/agent/test_context_builder_params_state.py
@@ -159,4 +159,4 @@ class TestBuildAdapterContext:
 
         context = QueryEntryAdapter.build_adapter_context(query, binding=None)
 
-        assert context == {'params': {}, 'query_id': 123}
+        assert context == {'params': {}, 'query_id': 123, 'prompt_get': False}
diff --git a/tests/unit_tests/agent/test_event_log_transcript.py b/tests/unit_tests/agent/test_event_log_transcript.py
index 814144ec..fa24e4b6 100644
--- a/tests/unit_tests/agent/test_event_log_transcript.py
+++ b/tests/unit_tests/agent/test_event_log_transcript.py
@@ -2,8 +2,6 @@
 from __future__ import annotations
 
 import pytest
-from unittest.mock import Mock, MagicMock, patch
-import datetime
 
 from langbot.pkg.agent.runner.host_models import (
     AgentEventEnvelope,
@@ -17,7 +15,6 @@ from langbot.pkg.agent.runner.event_log_store import EventLogStore
 from langbot.pkg.agent.runner.transcript_store import TranscriptStore
 from langbot.pkg.agent.runner.session_registry import get_session_registry
 from langbot_plugin.api.entities.builtin.agent_runner.event import (
-    AgentEventContext,
     ActorContext,
 )
 from langbot_plugin.api.entities.builtin.agent_runner.input import AgentInput
@@ -386,9 +383,7 @@ class TestEventLogStoreRealSQLite:
     async def db_engine(self):
         """Create an in-memory SQLite database for testing."""
         from sqlalchemy.ext.asyncio import create_async_engine
-        from sqlalchemy import text
         from langbot.pkg.entity.persistence.base import Base
-        from langbot.pkg.entity.persistence.event_log import EventLog
 
         engine = create_async_engine("sqlite+aiosqlite:///:memory:")
 
@@ -483,9 +478,7 @@ class TestTranscriptStoreRealSQLite:
     async def db_engine(self):
         """Create an in-memory SQLite database for testing."""
         from sqlalchemy.ext.asyncio import create_async_engine
-        from sqlalchemy import text
         from langbot.pkg.entity.persistence.base import Base
-        from langbot.pkg.entity.persistence.transcript import Transcript
 
         engine = create_async_engine("sqlite+aiosqlite:///:memory:")
 
@@ -521,6 +514,44 @@ class TestTranscriptStoreRealSQLite:
         assert len(items) == 3
         assert items[0]["conversation_id"] == "conv_001"
 
+    @pytest.mark.asyncio
+    async def test_get_legacy_provider_messages_projects_transcript_history(self, db_engine):
+        """Transcript is the canonical source; legacy Pipeline readers get a Message view."""
+        store = TranscriptStore(db_engine)
+
+        await store.append_transcript(
+            transcript_id="trans_view_001",
+            event_id="evt_view_001",
+            conversation_id="conv_view",
+            role="user",
+            content="User text",
+            content_json={
+                "role": "user",
+                "content": [{"type": "text", "text": "User structured text"}],
+            },
+        )
+        await store.append_transcript(
+            transcript_id="trans_view_002",
+            event_id="evt_view_002",
+            conversation_id="conv_view",
+            role="tool",
+            item_type="tool_result",
+            content="ignored tool result",
+        )
+        await store.append_transcript(
+            transcript_id="trans_view_003",
+            event_id="evt_view_003",
+            conversation_id="conv_view",
+            role="assistant",
+            content="Assistant text",
+        )
+
+        messages = await store.get_legacy_provider_messages("conv_view")
+
+        assert [message.role for message in messages] == ["user", "assistant"]
+        assert messages[0].content[0].text == "User structured text"
+        assert messages[1].content == "Assistant text"
+
     @pytest.mark.asyncio
     async def test_search_transcript_real_db(self, db_engine):
         """Test search_transcript with real DB."""
@@ -586,7 +617,7 @@ def mock_db_engine():
 @pytest.fixture
 def mock_handler():
     """Create a mock handler for testing actions."""
-    from langbot_plugin.runtime.io.handler import Handler, ActionResponse
+    from langbot_plugin.runtime.io.handler import Handler
 
     class MockHandler(Handler):
         def __init__(self):
diff --git a/tests/unit_tests/agent/test_orchestrator_integration.py b/tests/unit_tests/agent/test_orchestrator_integration.py
index cf3deaf6..81557f87 100644
--- a/tests/unit_tests/agent/test_orchestrator_integration.py
+++ b/tests/unit_tests/agent/test_orchestrator_integration.py
@@ -593,6 +593,7 @@ class TestQueryEntryAdapterParams:
         context = plugin_connector.contexts[0]
         assert "prompt" not in context
         assert "prompt" not in context["adapter"]["extra"]
+        assert context["context"]["available_apis"]["prompt_get"] is True
 
     @pytest.mark.asyncio
     async def test_params_filtering_keeps_public_param(self, clean_agent_state):
diff --git a/tests/unit_tests/pipeline/test_preproc.py b/tests/unit_tests/pipeline/test_preproc.py
index 9620a1c1..9495b69c 100644
--- a/tests/unit_tests/pipeline/test_preproc.py
+++ b/tests/unit_tests/pipeline/test_preproc.py
@@ -50,6 +50,8 @@ def make_host_model_runner_descriptor(
     multimodal_input: bool = True,
     tool_calling: bool = True,
     knowledge_retrieval: bool = True,
+    skill_authoring: bool = False,
+    skill_injection: bool = False,
 ):
     from langbot.pkg.agent.runner.descriptor import AgentRunnerDescriptor
 
@@ -69,6 +71,8 @@ def make_host_model_runner_descriptor(
             'tool_calling': tool_calling,
             'knowledge_retrieval': knowledge_retrieval,
             'multimodal_input': multimodal_input,
+            'skill_authoring': skill_authoring,
+            'skill_injection': skill_injection,
         },
         permissions={
             'models': ['list', 'invoke', 'stream'],
diff --git a/tests/unit_tests/test_preproc.py b/tests/unit_tests/test_preproc.py
index 3164f35b..079a5201 100644
--- a/tests/unit_tests/test_preproc.py
+++ b/tests/unit_tests/test_preproc.py
@@ -17,6 +17,32 @@ from langbot_plugin.api.entities.builtin.provider.prompt import Prompt
 from langbot_plugin.api.entities.builtin.provider.session import Conversation, LauncherTypes, Session
 
 
+class _FakeRunnerDescriptor:
+    config_schema = [
+        {'name': 'model', 'type': 'model-fallback-selector'},
+        {'name': 'prompt', 'type': 'prompt-editor', 'default': []},
+        {'name': 'knowledge-bases', 'type': 'knowledge-base-multi-selector', 'default': []},
+    ]
+    permissions = {
+        'models': ['list', 'invoke', 'stream'],
+        'tools': ['list', 'detail', 'call'],
+        'knowledge_bases': ['list', 'retrieve'],
+    }
+    capabilities = {
+        'tool_calling': True,
+        'knowledge_retrieval': True,
+        'multimodal_input': True,
+        'skill_authoring': True,
+        'skill_injection': True,
+    }
+
+    def supports_tool_calling(self):
+        return self.capabilities.get('tool_calling', False)
+
+    def supports_knowledge_retrieval(self):
+        return self.capabilities.get('knowledge_retrieval', False)
+
+
 def _make_query() -> Query:
     message_chain = MessageChain([Plain(text='create a skill')])
     return Query(
@@ -34,11 +60,13 @@ def _make_query() -> Query:
         pipeline_uuid='pipe-1',
         pipeline_config={
             'ai': {
-                'runner': {'runner': 'local-agent'},
-                'local-agent': {
-                    'model': {'primary': 'model-1', 'fallbacks': []},
-                    'prompt': 'default',
-                    'knowledge-bases': [],
+                'runner': {'id': 'plugin:langbot/local-agent/default'},
+                'runner_config': {
+                    'plugin:langbot/local-agent/default': {
+                        'model': {'primary': 'model-1', 'fallbacks': []},
+                        'prompt': [],
+                        'knowledge-bases': [],
+                    },
                 },
             },
             'trigger': {'misc': {}},
@@ -57,6 +85,15 @@ def _make_conversation() -> Conversation:
     )
 
 
+async def _passthrough_preproc_event(event, bound_plugins):
+    return SimpleNamespace(
+        event=SimpleNamespace(
+            default_prompt=event.default_prompt,
+            prompt=event.prompt,
+        )
+    )
+
+
 def _make_app(*, skill_service) -> SimpleNamespace:
     session = Session(launcher_type=LauncherTypes.PERSON, launcher_id='launcher-1', sender_id='sender-1')
     conversation = _make_conversation()
@@ -83,6 +120,7 @@ def _make_app(*, skill_service) -> SimpleNamespace:
         pipeline_service=SimpleNamespace(
             get_pipeline=AsyncMock(return_value={'extensions_preferences': {'enable_all_skills': True}})
         ),
+        agent_runner_registry=SimpleNamespace(get=AsyncMock(return_value=_FakeRunnerDescriptor())),
         skill_mgr=SimpleNamespace(
             build_skill_aware_prompt_addition=Mock(return_value=''),
             skills={},
@@ -197,6 +235,49 @@ async def test_preproc_skips_injection_when_addendum_is_empty():
         assert 'Available Skills' not in (query.prompt.messages[0].content or '')
 
 
+@pytest.mark.asyncio
+async def test_preproc_uses_transcript_history_view_when_available():
+    preproc_module, entities_module = _import_preproc_modules()
+
+    app = _make_app(skill_service=SimpleNamespace())
+    conversation = app.sess_mgr.get_conversation.return_value
+    conversation.messages = [Message(role='user', content='legacy history')]
+    app.plugin_connector.emit_event = AsyncMock(side_effect=_passthrough_preproc_event)
+
+    transcript_messages = [
+        Message(role='user', content='from transcript user'),
+        Message(role='assistant', content='from transcript assistant'),
+    ]
+
+    stage = preproc_module.PreProcessor(app)
+    stage._load_agent_runner_history_messages = AsyncMock(return_value=transcript_messages)
+
+    query = _make_query()
+    result = await stage.process(query, 'PreProcessor')
+
+    assert result.result_type == entities_module.ResultType.CONTINUE
+    assert query.messages == transcript_messages
+
+
+@pytest.mark.asyncio
+async def test_preproc_falls_back_to_conversation_messages_when_transcript_empty():
+    preproc_module, entities_module = _import_preproc_modules()
+
+    app = _make_app(skill_service=SimpleNamespace())
+    legacy_messages = [Message(role='user', content='legacy history')]
+    app.sess_mgr.get_conversation.return_value.messages = legacy_messages
+    app.plugin_connector.emit_event = AsyncMock(side_effect=_passthrough_preproc_event)
+
+    stage = preproc_module.PreProcessor(app)
+    stage._load_agent_runner_history_messages = AsyncMock(return_value=None)
+
+    query = _make_query()
+    result = await stage.process(query, 'PreProcessor')
+
+    assert result.result_type == entities_module.ResultType.CONTINUE
+    assert query.messages == legacy_messages
+
+
 async def stage_process_capture(preproc_module, app, query):
     """Run PreProcessor.process and return the result while keeping ``query``
     accessible to the assertions (process mutates query in place)."""