[dotnet-port-fixes] Cover implicit tool approval sessions

[github-actions]

Summary

Added regression coverage for the .NET tool-approval no-session fix by exercising Go's existing implicit-session behavior through a real agent run. The new tests verify that agent.prepareRun creates exactly one implicit session, threads it through tool-approval auto-approval re-entry, and still provides that session on a no-approval pass-through run.

Ported .NET PRs

• .NET: Create session for tool approval agent when none provided agent-framework#7310 - create and thread a session for tool approval when the caller does not supply one
• Upstream commit: 28e02d466997972d51c0a435b133a875f7444976 (link)

Breaking Changes

No. This is a test-only parity update for behavior the Go SDK already implements.

Tests and Examples

• go test ./agent/harness/toolapproval
• Added focused tests for implicit session threading during tool-approval auto-approval re-entry and for single implicit-session creation when no approval request is returned

Notes

Go already aligned the runtime behavior before this change because agent.prepareRun injects an implicit session before middleware executes. This PR ports the upstream regression coverage so that alignment stays protected. Go uses a single streamed run path, so separate .NET non-streaming and streaming coverage collapses into these focused tests.

Generated by .NET to Go Fixes and Test Porting Agent · gpt54 · 229.6 AIC · ⌖ 11.7 AIC · ⊞ 24.2K · ◷

---

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The changes have been pushed to branch copilot/dotnet-port-fixes-toolapproval-implicit-session-684c84d4411d22d8.

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Show patch preview (169 of 169 lines)

From a9aba78c4bedef81f692dd7042c1a5154b785801 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Wed, 19 Aug 2026 02:55:15 +0000
Subject: [PATCH] test: cover implicit tool approval sessions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .../harness/toolapproval/toolapproval_test.go | 137 ++++++++++++++++++
 1 file changed, 137 insertions(+)

diff --git a/agent/harness/toolapproval/toolapproval_test.go b/agent/harness/toolapproval/toolapproval_test.go
index d078861fd..f1f4021ea 100644
--- a/agent/harness/toolapproval/toolapproval_test.go
+++ b/agent/harness/toolapproval/toolapproval_test.go
@@ -30,6 +30,15 @@ func collectUpdates(t *testing.T, mw agent.Middleware, next agent.RunFunc, messa
 	return updates
 }
 
+func sessionFromOptions(t *testing.T, opts ...agent.Option) *agent.Session {
+	t.Helper()
+	session, ok := agent.GetOption(opts, agent.WithSession)
+	if !ok || session == nil {
+		t.Fatal("expected run options to include a non-nil session")
+	}
+	return session
+}
+
 func TestToolApproval_PassthroughWithoutApprovalRequests(t *testing.T) {
 	runner := &agenttest.Runner{
 		Responses: agenttest.NewResponseBuilder().AddText("hello").Build(),
@@ -147,6 +156,134 @@ func TestToolApproval_SurfacesFirstApprovalRequest(t *testing.T) {
 	}
 }
 
+func TestToolApproval_AutoApprovalRuleWithoutExplicitSessionThreadsImplicitSession(t *testing.T) {
+	fcc := &message.FunctionCallContent{CallID: "c1", Name: "deploy", Arguments: `{"env":"prod"}`}
+
+	var createdSession *agent.Session
+	createSessionCalls := 0
+	capturedSessions := []*agent.Session{}
+
+	runner := &agenttest.Runner{
+		Responses: agenttest.NewResponseBuilder(
+			func(_ context.Context, _ []*message.Message, opts ...agent.Option) {
+				capturedSessions = append(capturedSessions, sessionFromOptions(t, opts...))
+			},
+		).
+			Add(&agent.ResponseUpdate{
+				Role: message.RoleAssistant,
+				Contents: []message.Content{
+					&mes
... (truncated)