diff --git a/conductor/tier2/opencode.json.fragment b/conductor/tier2/opencode.json.fragment
index 582273bd..620d12bb 100644
--- a/conductor/tier2/opencode.json.fragment
+++ b/conductor/tier2/opencode.json.fragment
@@ -1,6 +1,53 @@
 {
   "$schema": "https://opencode.ai/config.json",
   "default_agent": "tier2-autonomous",
+  "permission": {
+    "edit": "deny",
+    "read": {
+      "*": "deny",
+      "C:\\projects\\manual_slop_tier2\\**": "allow",
+      "C:\\Users\\Ed\\AppData\\Local\\manual_slop\\tier2\\**": "allow",
+      "C:\\Users\\Ed\\AppData\\Local\\manual_slop\\tier2_failures\\**": "allow"
+    },
+    "write": {
+      "*": "deny",
+      "C:\\projects\\manual_slop_tier2\\**": "allow",
+      "C:\\Users\\Ed\\AppData\\Local\\manual_slop\\tier2\\**": "allow",
+      "C:\\Users\\Ed\\AppData\\Local\\manual_slop\\tier2_failures\\**": "allow"
+    },
+    "bash": {
+      "*": "deny",
+      "git status*": "allow",
+      "git diff*": "allow",
+      "git log*": "allow",
+      "git add*": "allow",
+      "git commit*": "allow",
+      "git switch*": "allow",
+      "git branch*": "allow",
+      "git fetch*": "allow",
+      "git remote*": "allow",
+      "git rev-parse*": "allow",
+      "git show*": "allow",
+      "git config --get*": "allow",
+      "ls*": "allow",
+      "cat*": "allow",
+      "head*": "allow",
+      "tail*": "allow",
+      "find*": "allow",
+      "echo*": "allow",
+      "mkdir*": "allow",
+      "cp*": "allow",
+      "mv*": "allow",
+      "rm*": "allow",
+      "uv run python scripts/run_tests_batched.py*": "allow",
+      "uv run python scripts/tier2/*": "allow",
+      "pwsh -File scripts/tier2/*": "allow",
+      "git push*": "deny",
+      "git checkout*": "deny",
+      "git restore*": "deny",
+      "git reset*": "deny"
+    }
+  },
   "agent": {
     "tier2-autonomous": {
       "model": "minimax-coding-plan/MiniMax-M3",
diff --git a/scripts/tier2/setup_tier2_clone.ps1 b/scripts/tier2/setup_tier2_clone.ps1
index e874451f..7b0c38b9 100644
--- a/scripts/tier2/setup_tier2_clone.ps1
+++ b/scripts/tier2/setup_tier2_clone.ps1
@@ -61,13 +61,24 @@ if ($PSCmdlet.ShouldProcess("Bootstrap Tier 2 clone at $Tier2ClonePath")) {
         Copy-Item -Force "$MainRepoPath\conductor\tier2\agents\tier2-autonomous.md" "$Tier2ClonePath\.opencode\agents\tier2-autonomous.md"
         Copy-Item -Force "$MainRepoPath\conductor\tier2\commands\tier-2-auto-execute.md" "$Tier2ClonePath\.opencode\commands\tier-2-auto-execute.md"
 
-        # Merge opencode.json.fragment into the clone's opencode.json
+        # Merge opencode.json.fragment into the clone's opencode.json.
+        # The clone inherits a copy of the main repo's opencode.json (via
+        # `git clone`), which has top-level `permission.edit: ask` and
+        # `permission.bash: ask`. Those would be unsafe in the sandbox: the
+        # build/plan default agents could read/write anywhere on disk, and
+        # there is no file-system allowlist at the top level. We replace
+        # the top-level `permission` with the hardened sandbox version
+        # (deny-all + allowlist for the sandbox dirs + the tier2-autonomous
+        # agent's permission block). The agent's `permission` overrides the
+        # top-level for that agent's tool calls.
         $cloneConfig = "$Tier2ClonePath\opencode.json"
         $fragment = Get-Content "$MainRepoPath\conductor\tier2\opencode.json.fragment" -Raw | ConvertFrom-Json
         if (Test-Path $cloneConfig) {
             $existing = Get-Content $cloneConfig -Raw | ConvertFrom-Json
             if (-not $existing.agent) { $existing | Add-Member -MemberType NoteProperty -Name agent -Value ([PSCustomObject]@{}) }
             $existing.agent | Add-Member -MemberType NoteProperty -Name "tier2-autonomous" -Value $fragment.agent."tier2-autonomous" -Force
+            if (-not $existing.permission) { $existing | Add-Member -MemberType NoteProperty -Name permission -Value ([PSCustomObject]@{}) }
+            $existing.permission = $fragment.permission
             $existing | Add-Member -MemberType NoteProperty -Name default_agent -Value "tier2-autonomous" -Force
             $existing | ConvertTo-Json -Depth 10 | Set-Content $cloneConfig
         } else {
diff --git a/tests/test_tier2_slash_command_spec.py b/tests/test_tier2_slash_command_spec.py
index 31c4ff52..cddbcdb8 100644
--- a/tests/test_tier2_slash_command_spec.py
+++ b/tests/test_tier2_slash_command_spec.py
@@ -42,9 +42,9 @@ def test_command_uses_git_switch_not_checkout() -> None:
  assert all("checkout" not in line for line in shell_lines), f"protocol uses git checkout: {shell_lines}"
 
 
-def test_command_fetches_origin_main() -> None:
+def test_command_fetches_origin_master() -> None:
  content = COMMAND_PATH.read_text(encoding="utf-8")
- assert "git fetch origin main" in content
+ assert "git fetch origin master" in content
 
 
 def test_command_initializes_failcount_state() -> None:
@@ -87,3 +87,26 @@ def test_config_fragment_valid_json() -> None:
  assert "git checkout*" in perms["bash"]
  assert "git restore*" in perms["bash"]
  assert "git reset*" in perms["bash"]
+
+
+def test_config_fragment_has_top_level_permission() -> None:
+ """Top-level permission.read/write MUST allow the sandbox dirs (added
+ 2026-06-17 after the bug where the agent's permission.read was not
+ enforced for the default agent, leading to ACCESS DENIED on
+ manual_slop_tier2 paths)."""
+ data = json.loads(CONFIG_PATH.read_text(encoding="utf-8"))
+ assert "permission" in data
+ top = data["permission"]
+ assert "read" in top, "top-level permission.read is required"
+ assert top["read"].get("*") == "deny", "top-level permission.read MUST deny *"
+ assert top["read"].get("C:\\projects\\manual_slop_tier2\\**") == "allow", "sandbox clone path must be allowlisted"
+ assert "write" in top
+ assert top["write"].get("*") == "deny"
+ assert top["write"].get("C:\\projects\\manual_slop_tier2\\**") == "allow"
+ assert "bash" in top
+ assert top["bash"].get("*") == "deny", "top-level bash MUST deny * (default agents are locked down)"
+ assert top["bash"].get("git status*") == "allow", "read-only git commands must be in the allowlist"
+ assert top["bash"].get("git push*") == "deny"
+ assert top["bash"].get("git checkout*") == "deny"
+ assert top["bash"].get("git restore*") == "deny"
+ assert top["bash"].get("git reset*") == "deny"