diff --git a/recipes/engine_v2/engine_v2.expected/monorepo_config_file.json b/recipes/engine_v2/engine_v2.expected/monorepo_config_file.json
new file mode 100644
index 0000000..a4424a9
--- /dev/null
+++ b/recipes/engine_v2/engine_v2.expected/monorepo_config_file.json
@@ -0,0 +1,538 @@
+[
+  {
+    "cmd": [],
+    "name": "Checkout flutter/monorepo"
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[START_DIR]/monorepo",
+      "--url",
+      "https://dart.googlesource.com/monorepo"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.git setup",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "--recurse-submodules",
+      "--progress",
+      "--tags"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.git fetch",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.git checkout",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.read revision",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.git clean",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.submodule sync",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[START_DIR]/monorepo",
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout flutter/monorepo.submodule update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/monorepo/ci/builders/config_name.json",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Read build config file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@config_name.json@{@@@",
+      "@@@STEP_LOG_LINE@config_name.json@  \"builds\": [@@@",
+      "@@@STEP_LOG_LINE@config_name.json@    {@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      \"generators\": [@@@",
+      "@@@STEP_LOG_LINE@config_name.json@        {@@@",
+      "@@@STEP_LOG_LINE@config_name.json@          \"name\": \"generator1\",@@@",
+      "@@@STEP_LOG_LINE@config_name.json@          \"script\": \"script1.sh\"@@@",
+      "@@@STEP_LOG_LINE@config_name.json@        }@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      ],@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      \"gn\": [@@@",
+      "@@@STEP_LOG_LINE@config_name.json@        \"--ios\"@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      ],@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      \"name\": \"ios_debug\",@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      \"ninja\": {@@@",
+      "@@@STEP_LOG_LINE@config_name.json@        \"config\": \"ios_debug\",@@@",
+      "@@@STEP_LOG_LINE@config_name.json@        \"targets\": []@@@",
+      "@@@STEP_LOG_LINE@config_name.json@      }@@@",
+      "@@@STEP_LOG_LINE@config_name.json@    }@@@",
+      "@@@STEP_LOG_LINE@config_name.json@  ]@@@",
+      "@@@STEP_LOG_LINE@config_name.json@}@@@",
+      "@@@STEP_LOG_END@config_name.json@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "launch builds"
+  },
+  {
+    "cmd": [
+      "bb",
+      "batch",
+      "-host",
+      "cr-buildbucket.appspot.com"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "launch builds.schedule",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"try\", \"builder\": \"Linux Staging Engine Drone\", \"project\": \"proj\"}, \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gerritChanges\": [{\"change\": \"123456\", \"host\": \"dart-review.googlesource.com\", \"patchset\": \"7\", \"project\": \"monorepo\"}], \"gitilesCommit\": {\"host\": \"dart.googlesource.com\", \"id\": \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\", \"project\": \"monorepo\", \"ref\": \"refs/heads/main\"}, \"priority\": 25, \"properties\": {\"build\": {\"generators\": [{\"name\": \"generator1\", \"script\": \"script1.sh\"}], \"gn\": [\"--ios\"], \"name\": \"ios_debug\", \"ninja\": {\"config\": \"ios_debug\", \"targets\": []}}, \"builds\": [{\"generators\": [{\"name\": \"generator1\", \"script\": \"script1.sh\"}], \"gn\": [\"--ios\"], \"name\": \"ios_debug\", \"ninja\": {\"config\": \"ios_debug\", \"targets\": []}}], \"config_name\": \"config_name\", \"environment\": \"Staging\", \"recipe\": \"engine_v2/builder\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"cq_experimental\", \"value\": \"false\"}, {\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@    {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"scheduleBuild\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"builder\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"bucket\": \"try\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"builder\": \"builder-subbuild1\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"project\": \"fuchsia\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }, @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"id\": \"8945511751514863186\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  ]@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@STEP_LOG_LINE@request@{@@@",
+      "@@@STEP_LOG_LINE@request@  \"requests\": [@@@",
+      "@@@STEP_LOG_LINE@request@    {@@@",
+      "@@@STEP_LOG_LINE@request@      \"scheduleBuild\": {@@@",
+      "@@@STEP_LOG_LINE@request@        \"builder\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"bucket\": \"try\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"builder\": \"Linux Staging Engine Drone\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"project\": \"proj\"@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"exe\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"cipdVersion\": \"refs/heads/main\"@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"experimental\": \"NO\", @@@",
+      "@@@STEP_LOG_LINE@request@        \"experiments\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"luci.buildbucket.parent_tracking\": false@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", @@@",
+      "@@@STEP_LOG_LINE@request@        \"gerritChanges\": [@@@",
+      "@@@STEP_LOG_LINE@request@          {@@@",
+      "@@@STEP_LOG_LINE@request@            \"change\": \"123456\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"host\": \"dart-review.googlesource.com\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"patchset\": \"7\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"project\": \"monorepo\"@@@",
+      "@@@STEP_LOG_LINE@request@          }@@@",
+      "@@@STEP_LOG_LINE@request@        ], @@@",
+      "@@@STEP_LOG_LINE@request@        \"gitilesCommit\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"host\": \"dart.googlesource.com\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"id\": \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"project\": \"monorepo\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/main\"@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
+      "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"build\": {@@@",
+      "@@@STEP_LOG_LINE@request@            \"generators\": [@@@",
+      "@@@STEP_LOG_LINE@request@              {@@@",
+      "@@@STEP_LOG_LINE@request@                \"name\": \"generator1\", @@@",
+      "@@@STEP_LOG_LINE@request@                \"script\": \"script1.sh\"@@@",
+      "@@@STEP_LOG_LINE@request@              }@@@",
+      "@@@STEP_LOG_LINE@request@            ], @@@",
+      "@@@STEP_LOG_LINE@request@            \"gn\": [@@@",
+      "@@@STEP_LOG_LINE@request@              \"--ios\"@@@",
+      "@@@STEP_LOG_LINE@request@            ], @@@",
+      "@@@STEP_LOG_LINE@request@            \"name\": \"ios_debug\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"ninja\": {@@@",
+      "@@@STEP_LOG_LINE@request@              \"config\": \"ios_debug\", @@@",
+      "@@@STEP_LOG_LINE@request@              \"targets\": []@@@",
+      "@@@STEP_LOG_LINE@request@            }@@@",
+      "@@@STEP_LOG_LINE@request@          }, @@@",
+      "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
+      "@@@STEP_LOG_LINE@request@            {@@@",
+      "@@@STEP_LOG_LINE@request@              \"generators\": [@@@",
+      "@@@STEP_LOG_LINE@request@                {@@@",
+      "@@@STEP_LOG_LINE@request@                  \"name\": \"generator1\", @@@",
+      "@@@STEP_LOG_LINE@request@                  \"script\": \"script1.sh\"@@@",
+      "@@@STEP_LOG_LINE@request@                }@@@",
+      "@@@STEP_LOG_LINE@request@              ], @@@",
+      "@@@STEP_LOG_LINE@request@              \"gn\": [@@@",
+      "@@@STEP_LOG_LINE@request@                \"--ios\"@@@",
+      "@@@STEP_LOG_LINE@request@              ], @@@",
+      "@@@STEP_LOG_LINE@request@              \"name\": \"ios_debug\", @@@",
+      "@@@STEP_LOG_LINE@request@              \"ninja\": {@@@",
+      "@@@STEP_LOG_LINE@request@                \"config\": \"ios_debug\", @@@",
+      "@@@STEP_LOG_LINE@request@                \"targets\": []@@@",
+      "@@@STEP_LOG_LINE@request@              }@@@",
+      "@@@STEP_LOG_LINE@request@            }@@@",
+      "@@@STEP_LOG_LINE@request@          ], @@@",
+      "@@@STEP_LOG_LINE@request@          \"config_name\": \"config_name\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"environment\": \"Staging\", @@@",
+      "@@@STEP_LOG_LINE@request@          \"recipe\": \"engine_v2/builder\"@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", @@@",
+      "@@@STEP_LOG_LINE@request@        \"swarming\": {@@@",
+      "@@@STEP_LOG_LINE@request@          \"parentRunId\": \"fake-task-id\"@@@",
+      "@@@STEP_LOG_LINE@request@        }, @@@",
+      "@@@STEP_LOG_LINE@request@        \"tags\": [@@@",
+      "@@@STEP_LOG_LINE@request@          {@@@",
+      "@@@STEP_LOG_LINE@request@            \"key\": \"cq_experimental\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"value\": \"false\"@@@",
+      "@@@STEP_LOG_LINE@request@          }, @@@",
+      "@@@STEP_LOG_LINE@request@          {@@@",
+      "@@@STEP_LOG_LINE@request@            \"key\": \"parent_buildbucket_id\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"value\": \"8945511751514863184\"@@@",
+      "@@@STEP_LOG_LINE@request@          }, @@@",
+      "@@@STEP_LOG_LINE@request@          {@@@",
+      "@@@STEP_LOG_LINE@request@            \"key\": \"user_agent\", @@@",
+      "@@@STEP_LOG_LINE@request@            \"value\": \"recipe\"@@@",
+      "@@@STEP_LOG_LINE@request@          }@@@",
+      "@@@STEP_LOG_LINE@request@        ]@@@",
+      "@@@STEP_LOG_LINE@request@      }@@@",
+      "@@@STEP_LOG_LINE@request@    }@@@",
+      "@@@STEP_LOG_LINE@request@  ]@@@",
+      "@@@STEP_LOG_LINE@request@}@@@",
+      "@@@STEP_LOG_END@request@@@",
+      "@@@STEP_LINK@8945511751514863186@https://cr-buildbucket.appspot.com/build/8945511751514863186@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "collect builds"
+  },
+  {
+    "cmd": [],
+    "name": "collect builds.collect",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "bb",
+      "collect",
+      "-host",
+      "cr-buildbucket.appspot.com",
+      "-interval",
+      "20s",
+      "8945511751514863186"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "collect builds.collect.wait",
+    "timeout": 86400,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "bb",
+      "batch",
+      "-host",
+      "cr-buildbucket.appspot.com"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "proj:try"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "collect builds.collect.get",
+    "stdin": "{\"requests\": [{\"getBuild\": {\"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,infra.swarming.taskId,input,number,output,startTime,status,summaryMarkdown,updateTime\", \"id\": \"8945511751514863186\"}}]}",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@    {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"getBuild\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"builder\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"bucket\": \"try\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"builder\": \"builder-subbuild1\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"project\": \"fuchsia\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }, @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"createTime\": \"2018-05-25T23:50:17Z\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"createdBy\": \"project:fuchsia\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"id\": \"8945511751514863186\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"infra\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"resultdb\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@            \"invocation\": \"invocations/build:8945511751514863186\"@@@",
+      "@@@STEP_LOG_LINE@json.output@          }, @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"swarming\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@            \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@json.output@            \"taskId\": \"abc123\"@@@",
+      "@@@STEP_LOG_LINE@json.output@          }@@@",
+      "@@@STEP_LOG_LINE@json.output@        }, @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"input\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"gerritChanges\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@            {@@@",
+      "@@@STEP_LOG_LINE@json.output@              \"change\": \"123456\", @@@",
+      "@@@STEP_LOG_LINE@json.output@              \"host\": \"chromium-review.googlesource.com\", @@@",
+      "@@@STEP_LOG_LINE@json.output@              \"patchset\": \"7\", @@@",
+      "@@@STEP_LOG_LINE@json.output@              \"project\": \"fuchsia\"@@@",
+      "@@@STEP_LOG_LINE@json.output@            }@@@",
+      "@@@STEP_LOG_LINE@json.output@          ]@@@",
+      "@@@STEP_LOG_LINE@json.output@        }, @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"output\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@            \"test_orchestration_inputs_hash\": \"abc\"@@@",
+      "@@@STEP_LOG_LINE@json.output@          }@@@",
+      "@@@STEP_LOG_LINE@json.output@        }, @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"status\": \"SUCCESS\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"tags\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@          {@@@",
+      "@@@STEP_LOG_LINE@json.output@            \"key\": \"cq_experimental\", @@@",
+      "@@@STEP_LOG_LINE@json.output@            \"value\": \"false\"@@@",
+      "@@@STEP_LOG_LINE@json.output@          }@@@",
+      "@@@STEP_LOG_LINE@json.output@        ]@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  ]@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@STEP_LOG_LINE@request@{@@@",
+      "@@@STEP_LOG_LINE@request@  \"requests\": [@@@",
+      "@@@STEP_LOG_LINE@request@    {@@@",
+      "@@@STEP_LOG_LINE@request@      \"getBuild\": {@@@",
+      "@@@STEP_LOG_LINE@request@        \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,infra.swarming.taskId,input,number,output,startTime,status,summaryMarkdown,updateTime\", @@@",
+      "@@@STEP_LOG_LINE@request@        \"id\": \"8945511751514863186\"@@@",
+      "@@@STEP_LOG_LINE@request@      }@@@",
+      "@@@STEP_LOG_LINE@request@    }@@@",
+      "@@@STEP_LOG_LINE@request@  ]@@@",
+      "@@@STEP_LOG_LINE@request@}@@@",
+      "@@@STEP_LOG_END@request@@@",
+      "@@@STEP_LINK@8945511751514863186@https://cr-buildbucket.appspot.com/build/8945511751514863186@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "display builds"
+  },
+  {
+    "cmd": [],
+    "name": "display builds.builder-subbuild1",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LINK@8945511751514863186@https://cr-buildbucket.appspot.com/build/8945511751514863186@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "launch tests"
+  },
+  {
+    "cmd": [],
+    "name": "collect tests"
+  },
+  {
+    "cmd": [],
+    "name": "display tests"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file
diff --git a/recipes/engine_v2/engine_v2.py b/recipes/engine_v2/engine_v2.py
index 0afce92..ddd8312 100644
--- a/recipes/engine_v2/engine_v2.py
+++ b/recipes/engine_v2/engine_v2.py
@@ -51,10 +51,15 @@
   archives = api.properties.get('archives')
   if config_name:
     # Read builds configuration from repository under test.
-    # Checkout engine repository only.
-    checkout_path = api.path['start_dir'].join('engine')
+    if api.buildbucket.gitiles_commit.project == 'monorepo':
+      project = 'monorepo'
+    else:
+      project = 'engine'
+
+    # Only check out the repository, not dependencies.
+    checkout_path = api.path['start_dir'].join(project)
     api.repo_util.checkout(
-        'engine',
+        project,
         checkout_path=checkout_path,
         url=api.properties.get('git_url'),
         ref=api.properties.get('git_ref')
@@ -319,3 +324,28 @@
           collect_step="collect builds",
       ),
   )
+
+  yield api.test(
+      'monorepo_config_file',
+      api.platform.name('linux'),
+      api.properties(
+          config_name='config_name',
+          builds=builds,
+          environment='Staging'),
+      api.buildbucket.try_build(
+          project='proj',
+          builder='try-builder',
+          git_repo='https://dart.googlesource.com/monorepo',
+          revision='a' * 40,
+          build_number=123,
+      ),
+      api.shard_util_v2.child_build_steps(
+          builds=[try_subbuild1],
+          launch_step="launch builds",
+          collect_step="collect builds",
+      ),
+      api.step_data(
+          'Read build config file',
+          api.file.read_json({'builds': builds})
+      ),
+  )