refactor(agent-runner): remove protocol_version from various components and update related documentation

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

@@ -124,7 +124,6 @@ class AgentRuntimeContext(typing.TypedDict):
     """Agent runtime context."""
 
     langbot_version: str | None
-    protocol_version: str
     trace_id: str | None
     deadline_at: float | None
     metadata: dict[str, typing.Any]
@@ -272,7 +271,6 @@ class AgentRunContextBuilder:
         # Build runtime context
         runtime: AgentRuntimeContext = {
             'langbot_version': self.ap.ver_mgr.get_current_version(),
-            'protocol_version': descriptor.protocol_version,
             'trace_id': run_id,
             'deadline_at': self._build_deadline_from_binding(binding),
             'metadata': {
@@ -424,6 +422,5 @@ class AgentRunContextBuilder:
                 'artifact_read': artifact_read_enabled,
                 'state': state_enabled,
                 'storage': True,
-                'prompt_get': False,
             },
         }

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

@@ -36,9 +36,6 @@ class AgentRunnerDescriptor(pydantic.BaseModel):
     plugin_version: str | None = None
     """Optional plugin version"""
 
-    protocol_version: str = '1'
-    """SDK protocol version, default '1'"""
-
     config_schema: list[dict[str, typing.Any]] = []
     """Configuration schema using DynamicForm format"""
 
@@ -69,4 +66,4 @@ class AgentRunnerDescriptor(pydantic.BaseModel):
 
     def supports_knowledge_retrieval(self) -> bool:
         """Check if runner supports knowledge retrieval."""
-        return self.capabilities.get('knowledge_retrieval', False)
+        return self.capabilities.get('knowledge_retrieval', False)

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

@@ -97,8 +97,6 @@ class AgentRunOrchestrator:
             session_query_id = adapter_context.get('query_id')
             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
 
         state_context = build_state_context(event, binding, descriptor)
         run_id = context['run_id']

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

@@ -149,7 +149,6 @@ class QueryEntryAdapter:
         return {
             'params': cls.build_params(query),
             'query_id': getattr(query, 'query_id', None),
-            'prompt_get': cls._has_effective_prompt(query),
         }
 
     @classmethod
@@ -187,12 +186,6 @@ 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

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

@@ -80,7 +80,7 @@ class AgentRunnerRegistry:
             runner_data: Raw runner data from plugin runtime with fields:
                 - plugin_author, plugin_name, runner_name
                 - manifest (full component manifest dict)
-                - protocol_version, capabilities, permissions, config (extracted from spec)
+                - capabilities, permissions, config (extracted from spec)
 
         Returns:
             AgentRunnerDescriptor if valid, None if invalid
@@ -114,7 +114,6 @@ class AgentRunnerRegistry:
 
         # SDK now provides these directly extracted from spec. Fall back to
         # manifest.spec for older runtimes/tests that return the raw manifest.
-        protocol_version = runner_data.get('protocol_version') or spec.get('protocol_version', '1')
         config_schema = runner_data.get('config') or spec.get('config', [])
         capabilities = runner_data.get('capabilities') or spec.get('capabilities', {})
         permissions = runner_data.get('permissions') or spec.get('permissions', {})
@@ -136,7 +135,6 @@ class AgentRunnerRegistry:
             plugin_name=plugin_name,
             runner_name=runner_name,
             plugin_version=runner_data.get('plugin_version'),
-            protocol_version=protocol_version,
             config_schema=config_schema,
             capabilities=capabilities,
             permissions=permissions,