Glenn-MS
diff --git a/‎python/packages/github_copilot/agent_framework_github_copilot/_agent.py‎
Lines changed: 93 additions & 7 deletions b/‎python/packages/github_copilot/agent_framework_github_copilot/_agent.py‎
Lines changed: 93 additions & 7 deletions
@@ -17,8 +17,10 @@
     BaseAgent,
     Content,
     ContextProvider,
+    HistoryProvider,
     Message,
     ResponseStream,
+    SessionContext,
     normalize_messages,
 )
 from agent_framework._settings import load_settings
@@ -352,13 +354,25 @@ def run(
             AgentException: If the request fails.
         """
         if stream:
+            ctx_holder: dict[str, Any] = {}
+
+            async def _after_run_hook(response: AgentResponse) -> None:
+                session_context = ctx_holder.get("session_context")
+                sess = ctx_holder.get("session")
+                if session_context is not None and sess is not None:
+                    session_context._response = response
+                    try:
+                        await self._run_after_providers(session=sess, context=session_context)
+                    except Exception:
+                        logger.exception("Error running after_run providers in streaming result hook")
 
             def _finalize(updates: Sequence[AgentResponseUpdate]) -> AgentResponse:
                 return AgentResponse.from_updates(updates)
 
             return ResponseStream(
-                self._stream_updates(messages=messages, session=session, options=options),
+                self._stream_updates(messages=messages, session=session, options=options, _ctx_holder=ctx_holder),
                 finalizer=_finalize,
+                result_hooks=[_after_run_hook],
             )
         return self._run_impl(messages=messages, session=session, options=options)
 
@@ -377,11 +391,22 @@ async def _run_impl(
             session = self.create_session()
 
         opts: dict[str, Any] = dict(options) if options else {}
-        timeout = opts.pop("timeout", None) or self._settings.get("timeout") or DEFAULT_TIMEOUT_SECONDS
+        timeout = opts.get("timeout") or self._settings.get("timeout") or DEFAULT_TIMEOUT_SECONDS
 
-        copilot_session = await self._get_or_create_session(session, streaming=False, runtime_options=opts)
         input_messages = normalize_messages(messages)
-        prompt = "\n".join([message.text for message in input_messages])
+
+        session_context = await self._run_before_providers(session=session, input_messages=input_messages, options=opts)
+
+        # NOTE: session is created after providers run so that future provider-contributed
+        # tools/config could be folded into runtime_options before session creation.
+        copilot_session = await self._get_or_create_session(session, streaming=False, runtime_options=opts)
+
+        # Build the prompt from the full set of messages in the session context,
+        # so that any context/history provider-injected messages are included.
+        context_messages = session_context.get_messages(include_input=True)
+        prompt = "\n".join([message.text for message in context_messages])
+        if session_context.instructions:
+            prompt = "\n".join(session_context.instructions) + "\n" + prompt
         message_options = cast(MessageOptions, {"prompt": prompt})
 
         try:
@@ -408,14 +433,18 @@ async def _run_impl(
                 )
             response_id = message_id
 
-        return AgentResponse(messages=response_messages, response_id=response_id)
+        response = AgentResponse(messages=response_messages, response_id=response_id)
+        session_context._response = response  # type: ignore[assignment]
+        await self._run_after_providers(session=session, context=session_context)
+        return response
 
     async def _stream_updates(
         self,
         messages: AgentRunInputs | None = None,
         *,
         session: AgentSession | None = None,
         options: OptionsT | None = None,
+        _ctx_holder: dict[str, Any] | None = None,
     ) -> AsyncIterable[AgentResponseUpdate]:
         """Internal method to stream updates from GitHub Copilot.
 
@@ -425,6 +454,9 @@ async def _stream_updates(
         Keyword Args:
             session: The conversation session associated with the message(s).
             options: Runtime options (model, timeout, etc.).
+            _ctx_holder: Internal dict populated with session_context and session
+                so that the caller (via a ResponseStream result_hook) can run
+                after_run providers without duplicating the updates buffer.
 
         Yields:
             AgentResponseUpdate items.
@@ -440,9 +472,23 @@ async def _stream_updates(
 
         opts: dict[str, Any] = dict(options) if options else {}
 
-        copilot_session = await self._get_or_create_session(session, streaming=True, runtime_options=opts)
         input_messages = normalize_messages(messages)
-        prompt = "\n".join([message.text for message in input_messages])
+
+        session_context = await self._run_before_providers(session=session, input_messages=input_messages, options=opts)
+
+        # NOTE: session is created after providers run so that future provider-contributed
+        # tools/config could be folded into runtime_options before session creation.
+        copilot_session = await self._get_or_create_session(session, streaming=True, runtime_options=opts)
+
+        if _ctx_holder is not None:
+            _ctx_holder["session_context"] = session_context
+            _ctx_holder["session"] = session
+
+        # Build the prompt from the full session context so provider-injected messages are included.
+        context_messages = session_context.get_messages(include_input=True)
+        prompt = "\n".join([message.text for message in context_messages])
+        if session_context.instructions:
+            prompt = "\n".join(session_context.instructions) + "\n" + prompt
         message_options = cast(MessageOptions, {"prompt": prompt})
 
         queue: asyncio.Queue[AgentResponseUpdate | Exception | None] = asyncio.Queue()
@@ -513,6 +559,46 @@ def event_handler(event: SessionEvent) -> None:
         finally:
             unsubscribe()
 
+    async def _run_before_providers(
+        self,
+        *,
+        session: AgentSession,
+        input_messages: list[Message],
+        options: dict[str, Any],
+    ) -> SessionContext:
+        """Run before_run on all context providers and return the session context.
+
+        Creates a SessionContext and invokes ``before_run`` on each provider in
+        forward order.  ``HistoryProvider`` instances with
+        ``load_messages=False`` are skipped.
+
+        Keyword Args:
+            session: The conversation session.
+            input_messages: The normalized input messages.
+            options: Runtime options dict.
+
+        Returns:
+            The SessionContext with provider context populated.
+        """
+        session_context = SessionContext(
+            session_id=session.session_id,
+            service_session_id=session.service_session_id,
+            input_messages=input_messages,
+            options=options,
+        )
+
+        for provider in self.context_providers:
+            if isinstance(provider, HistoryProvider) and not provider.load_messages:
+                continue
+            await provider.before_run(
+                agent=self,  # type: ignore[arg-type]
+                session=session,
+                context=session_context,
+                state=session.state.setdefault(provider.source_id, {}),
+            )
+
+        return session_context
+
     @staticmethod
     def _prepare_system_message(
         instructions: str | None,