OMP Tandem

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tandem_start

Launch a task with either a free-form prompt or a structured contract, then receive an immediate response while an independent AI peer works in a project-isolated context.

Instructions

Start a task with exactly one of prompt or structured contract. Returns immediately.

Base constraints/owned files stay fixed; each follow-up has a new goal and criteria. project_context_id pins product rules/decisions. Only the coordinator sets question timeout. Think: collaboration; analyze: read/search; work: edits/shell, NOT sandboxed. Use preflight=true to inspect admission without launching a worker. Structured requirements declare exact entry/boundary paths and shell/write needs; verification declares the agreed check ladder, never permission to execute it.

Input Schema

TableJSON Schema

Name	Required	Default
`cwd`	Yes
`mode`	No	analyze
`prompt`	No
`contract`	No
`execution`	No
`preflight`	No
`review_id`	No
`review_stage`	No
`timeout_seconds`	No
`project_context_id`	No
`question_timeout_seconds`	No

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv3.10.0Sep 17, 2026

changedInput schema / properties / contract / anyOf

Previous value: -[
-  {
-    "properties": {
-      "acceptance": {
-        "items": {
-          "maxLength": 2000,
-          "pattern": "\\S",
-          "type": "string"
-        },
-        "maxItems": 50,
-        "type": "array"
-      },
-      "artifact_ids": {
-        "items": {
-          "type": "string"
-        },
-        "maxItems": 32,
-        "type": "array"
-      },
-      "constraints": {
-        "items": {
-          "maxLength": 2000,
-          "pattern": "\\S",
-          "type": "string"
-        },
-        "maxItems": 50,
-        "type": "array"
-      },
-      "context": {
-        "default": "",
-        "maxLength": 60000,
-        "type": "string"
-      },
-      "context_options": {
-        "description": "Presentation of pinned product data, never a reduction of required policy.",
-        "properties": {
-          "advisory_rule_ids": {
-            "items": {
-              "maxLength": 100,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "maxItems": 50,
-            "type": "array"
-          },
-          "decision_ids": {
-            "items": {
-              "maxLength": 100,
-              "pattern": "\\S",
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array"
-          },
-          "delivery": {
-            "default": "capsule",
-            "enum": [
-              "capsule",
-              "full"
-            ],
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "goal": {
-        "maxLength": 8000,
-        "pattern": "\\S",
-        "type": "string"
-      },
-      "requirements": {
-        "description": "Declared execution needs; a live-path claim remains attributed evidence.",
-        "properties": {
-          "boundary_paths": {
-            "items": {
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array"
-          },
-          "entry_paths": {
-            "items": {
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array"
-          },
-          "live_path_evidence": {
-            "items": {
-              "type": "string"
-            },
-            "maxItems": 32,
-            "type": "array"
-          },
-          "requires_shell": {
-            "default": false,
-            "type": "boolean"
-          },
-          "requires_write": {
-            "default": false,
-            "type": "boolean"
-          }
-        },
-        "type": "object"
-      },
-      "scope": {
-        "description": "Declared file ownership for coordination; NOT a filesystem sandbox.",
-        "properties": {
-          "owned_files": {
-            "items": {
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "verification": {
-        "anyOf": [
-          {
-            "description": "Explicit check ladder; later phases include earlier required checks.",
-            "properties": {
-              "checks": {
-                "items": {
-                  "properties": {
-                    "command": {
-                      "anyOf": [
-                        {
-                          "maxLength": 2000,
-                          "type": "string"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ],
-                      "default": null
-                    },
-                    "criterion": {
-                      "maxLength": 2000,
-                      "pattern": "\\S",
-                      "type": "string"
-                    },
-                    "estimated_seconds": {
-                      "anyOf": [
-                        {
-                          "maximum": 7200,
-                          "minimum": 1,
-                          "type": "integer"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ],
-                      "default": null
-                    },
-                    "id": {
-                      "maxLength": 100,
-                      "pattern": "\\S",
-                      "type": "string"
-                    },
-                    "phase": {
-                      "default": "targeted",
-                      "enum": [
-                        "targeted",
-                        "candidate",
-                        "integration"
-                      ],
-                      "type": "string"
-                    },
-                    "requires_shell": {
-                      "default": false,
-                      "type": "boolean"
-                    },
-                    "scope": {
-                      "anyOf": [
-                        {
-                          "description": "Which bytes a run observed. Equal digests of the same kind are the same bytes.",
-                          "properties": {
-                            "boundaries": {
-                              "description": "What the run did not exercise (external services, other platforms, unselected files).",
-                              "items": {
-                                "maxLength": 2000,
-                                "pattern": "\\S",
-                                "type": "string"
-                              },
-                              "maxItems": 20,
-                              "type": "array"
-                            },
-                            "digest": {
-                              "pattern": "^[0-9a-f]{7,128}$",
-                              "type": "string"
-                            },
-                            "kind": {
-                              "enum": [
-                                "tree",
-                                "commit",
-                                "archive",
-                                "content"
-                              ],
-                              "type": "string"
-                            }
-                          },
-                          "required": [
-                            "kind",
-                            "digest"
-                          ],
-                          "type": "object"
-                        },
-                        {
-                          "type": "null"
-                        }
-                      ],
-                      "default": null,
-                      "description": "Explicit current input identity. History from other bytes remains recorded but is not a current result; omitted scope keeps ambiguous failures unresolved."
-                    }
-                  },
-                  "required": [
-                    "id",
-                    "criterion"
-                  ],
-                  "type": "object"
-                },
-                "maxItems": 50,
-                "type": "array"
-              },
-              "preparation_seconds": {
-                "default": 0,
-                "maximum": 7200,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "stage": {
-                "default": "targeted",
-                "enum": [
-                  "targeted",
-                  "candidate",
-                  "integration"
-                ],
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      }
-    },
-    "required": [
-      "goal"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "properties": {
+      "acceptance": {
+        "items": {
+          "maxLength": 2000,
+          "pattern": "\\S",
+          "type": "string"
+        },
+        "maxItems": 50,
+        "type": "array"
+      },
+      "acceptance_set": {
+        "anyOf": [
+          {
+            "description": "The declared denominator. Its revision is its content, not a version number.",
+            "properties": {
+              "items": {
+                "items": {
+                  "properties": {
+                    "id": {
+                      "pattern": "^[A-Za-z0-9][A-Za-z0-9._\\-]{0,99}$",
+                      "type": "string"
+                    },
+                    "obligations": {
+                      "description": "Declared clauses. Naming none keeps the criterion one undecomposed unit; naming some means a mapping of the parent covers none of them.",
+                      "items": {
+                        "description": "One clause of a criterion, with the exact environment it is owed in.",
+                        "properties": {
+                          "environment": {
+                            "patternProperties": {
+                              "\\S": {
+                                "maxLength": 200,
+                                "type": "string"
+                              }
+                            },
+                            "propertyNames": {
+                              "maxLength": 60
+                            },
+                            "type": "object"
+                          },
+                          "id": {
+                            "pattern": "^[A-Za-z0-9][A-Za-z0-9._\\-]{0,99}$",
+                            "type": "string"
+                          },
+                          "text": {
+                            "maxLength": 16000,
+                            "pattern": "\\S",
+                            "type": "string"
+                          }
+                        },
+                        "required": [
+                          "id",
+                          "text"
+                        ],
+                        "type": "object"
+                      },
+                      "maxItems": 100,
+                      "type": "array"
+                    },
+                    "text": {
+                      "maxLength": 16000,
+                      "pattern": "\\S",
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "id",
+                    "text"
+                  ],
+                  "type": "object"
+                },
+                "maxItems": 100,
+                "type": "array"
+              },
+              "revision": {
+                "pattern": "^[0-9a-f]{64}$",
+                "type": "string"
+              },
+              "schema_version": {
+                "const": 1,
+                "default": 1,
+                "type": "integer"
+              },
+              "set_id": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "set_id",
+              "revision"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Optional structured form of the same acceptance list: its texts must repeat acceptance exactly, so there is never a second source of truth."
+      },
+      "artifact_ids": {
+        "items": {
+          "type": "string"
+        },
+        "maxItems": 32,
+        "type": "array"
+      },
+      "constraints": {
+        "items": {
+          "maxLength": 2000,
+          "pattern": "\\S",
+          "type": "string"
+        },
+        "maxItems": 50,
+        "type": "array"
+      },
+      "context": {
+        "default": "",
+        "maxLength": 60000,
+        "type": "string"
+      },
+      "context_options": {
+        "description": "Presentation of pinned product data, never a reduction of required policy.",
+        "properties": {
+          "advisory_rule_ids": {
+            "items": {
+              "maxLength": 100,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "maxItems": 50,
+            "type": "array"
+          },
+          "decision_ids": {
+            "items": {
+              "maxLength": 100,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "delivery": {
+            "default": "capsule",
+            "enum": [
+              "capsule",
+              "full"
+            ],
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "goal": {
+        "maxLength": 8000,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "requirements": {
+        "description": "Declared execution needs; a live-path claim remains attributed evidence.",
+        "properties": {
+          "boundary_paths": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "entry_paths": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "live_path_evidence": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 32,
+            "type": "array"
+          },
+          "requires_shell": {
+            "default": false,
+            "type": "boolean"
+          },
+          "requires_write": {
+            "default": false,
+            "type": "boolean"
+          }
+        },
+        "type": "object"
+      },
+      "scope": {
+        "description": "Declared file ownership for coordination; NOT a filesystem sandbox.",
+        "properties": {
+          "owned_files": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          }
+        },
+        "type": "object"
+      },
+      "verification": {
+        "anyOf": [
+          {
+            "description": "Explicit check ladder; later phases include earlier required checks.",
+            "properties": {
+              "acceptance_coverage": {
+                "default": "report_only",
+                "description": "report_only surfaces gaps and refuses nothing. require_current_evidence additionally refuses a success report while a declared evidence unit lacks applicable current passing evidence.",
+                "enum": [
+                  "report_only",
+                  "require_current_evidence"
+                ],
+                "type": "string"
+              },
+              "checks": {
+                "items": {
+                  "properties": {
+                    "acceptance_refs": {
+                      "description": "Which declared criteria or obligations this check is intended to exercise. An assertion of intent, never of execution or sufficiency.",
+                      "items": {
+                        "description": "Points at one criterion or one of its obligations, at an exact revision.",
+                        "properties": {
+                          "criterion_id": {
+                            "pattern": "^[A-Za-z0-9][A-Za-z0-9._\\-]{0,99}$",
+                            "type": "string"
+                          },
+                          "obligation_id": {
+                            "anyOf": [
+                              {
+                                "pattern": "^[A-Za-z0-9][A-Za-z0-9._\\-]{0,99}$",
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ],
+                            "default": null
+                          },
+                          "revision": {
+                            "pattern": "^[0-9a-f]{64}$",
+                            "type": "string"
+                          },
+                          "set_id": {
+                            "type": "string"
+                          }
+                        },
+                        "required": [
+                          "set_id",
+                          "revision",
+                          "criterion_id"
+                        ],
+                        "type": "object"
+                      },
+                      "maxItems": 200,
+                      "type": "array"
+                    },
+                    "command": {
+                      "anyOf": [
+                        {
+                          "maxLength": 2000,
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null
+                    },
+                    "criterion": {
+                      "maxLength": 2000,
+                      "pattern": "\\S",
+                      "type": "string"
+                    },
+                    "estimated_seconds": {
+                      "anyOf": [
+                        {
+                          "maximum": 7200,
+                          "minimum": 1,
+                          "type": "integer"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null
+                    },
+                    "id": {
+                      "maxLength": 100,
+                      "pattern": "\\S",
+                      "type": "string"
+                    },
+                    "phase": {
+                      "default": "targeted",
+                      "enum": [
+                        "targeted",
+                        "candidate",
+                        "integration"
+                      ],
+                      "type": "string"
+                    },
+                    "requires_shell": {
+                      "default": false,
+                      "type": "boolean"
+                    },
+                    "scope": {
+                      "anyOf": [
+                        {
+                          "description": "Which bytes a run observed. Equal digests of the same kind are the same bytes.",
+                          "properties": {
+                            "boundaries": {
+                              "description": "What the run did not exercise (external services, other platforms, unselected files).",
+                              "items": {
+                                "maxLength": 2000,
+                                "pattern": "\\S",
+                                "type": "string"
+                              },
+                              "maxItems": 20,
+                              "type": "array"
+                            },
+                            "digest": {
+                              "pattern": "^[0-9a-f]{7,128}$",
+                              "type": "string"
+                            },
+                            "kind": {
+                              "enum": [
+                                "tree",
+                                "commit",
+                                "archive",
+                                "content"
+                              ],
+                              "type": "string"
+                            }
+                          },
+                          "required": [
+                            "kind",
+                            "digest"
+                          ],
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null,
+                      "description": "Explicit current input identity. History from other bytes remains recorded but is not a current result; omitted scope keeps ambiguous failures unresolved."
+                    }
+                  },
+                  "required": [
+                    "id",
+                    "criterion"
+                  ],
+                  "type": "object"
+                },
+                "maxItems": 50,
+                "type": "array"
+              },
+              "coverage_scope": {
+                "anyOf": [
+                  {
+                    "description": "Which bytes a run observed. Equal digests of the same kind are the same bytes.",
+                    "properties": {
+                      "boundaries": {
+                        "description": "What the run did not exercise (external services, other platforms, unselected files).",
+                        "items": {
+                          "maxLength": 2000,
+                          "pattern": "\\S",
+                          "type": "string"
+                        },
+                        "maxItems": 20,
+                        "type": "array"
+                      },
+                      "digest": {
+                        "pattern": "^[0-9a-f]{7,128}$",
+                        "type": "string"
+                      },
+                      "kind": {
+                        "enum": [
+                          "tree",
+                          "commit",
+                          "archive",
+                          "content"
+                        ],
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "kind",
+                      "digest"
+                    ],
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null,
+                "description": "The output bytes this coverage assessment is about. A declaration, not an observation of the filesystem."
+              },
+              "preparation_seconds": {
+                "default": 0,
+                "maximum": 7200,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "stage": {
+                "default": "targeted",
+                "enum": [
+                  "targeted",
+                  "candidate",
+                  "integration"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      }
+    },
+    "required": [
+      "goal"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed2 schema fields changedv3.8.0Sep 16, 2026

changedInput schema / properties / contract / anyOf

Previous value: -[
-  {
-    "properties": {
-      "acceptance": {
-        "items": {
-          "maxLength": 2000,
-          "pattern": "\\S",
-          "type": "string"
-        },
-        "maxItems": 50,
-        "type": "array"
-      },
-      "artifact_ids": {
-        "items": {
-          "type": "string"
-        },
-        "maxItems": 32,
-        "type": "array"
-      },
-      "constraints": {
-        "items": {
-          "maxLength": 2000,
-          "pattern": "\\S",
-          "type": "string"
-        },
-        "maxItems": 50,
-        "type": "array"
-      },
-      "context": {
-        "default": "",
-        "maxLength": 60000,
-        "type": "string"
-      },
-      "goal": {
-        "maxLength": 8000,
-        "pattern": "\\S",
-        "type": "string"
-      },
-      "scope": {
-        "description": "Declared file ownership for coordination; NOT a filesystem sandbox.",
-        "properties": {
-          "owned_files": {
-            "items": {
-              "type": "string"
-            },
-            "maxItems": 100,
-            "type": "array"
-          }
-        },
-        "type": "object"
-      }
-    },
-    "required": [
-      "goal"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "properties": {
+      "acceptance": {
+        "items": {
+          "maxLength": 2000,
+          "pattern": "\\S",
+          "type": "string"
+        },
+        "maxItems": 50,
+        "type": "array"
+      },
+      "artifact_ids": {
+        "items": {
+          "type": "string"
+        },
+        "maxItems": 32,
+        "type": "array"
+      },
+      "constraints": {
+        "items": {
+          "maxLength": 2000,
+          "pattern": "\\S",
+          "type": "string"
+        },
+        "maxItems": 50,
+        "type": "array"
+      },
+      "context": {
+        "default": "",
+        "maxLength": 60000,
+        "type": "string"
+      },
+      "context_options": {
+        "description": "Presentation of pinned product data, never a reduction of required policy.",
+        "properties": {
+          "advisory_rule_ids": {
+            "items": {
+              "maxLength": 100,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "maxItems": 50,
+            "type": "array"
+          },
+          "decision_ids": {
+            "items": {
+              "maxLength": 100,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "delivery": {
+            "default": "capsule",
+            "enum": [
+              "capsule",
+              "full"
+            ],
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "goal": {
+        "maxLength": 8000,
+        "pattern": "\\S",
+        "type": "string"
+      },
+      "requirements": {
+        "description": "Declared execution needs; a live-path claim remains attributed evidence.",
+        "properties": {
+          "boundary_paths": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "entry_paths": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          },
+          "live_path_evidence": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 32,
+            "type": "array"
+          },
+          "requires_shell": {
+            "default": false,
+            "type": "boolean"
+          },
+          "requires_write": {
+            "default": false,
+            "type": "boolean"
+          }
+        },
+        "type": "object"
+      },
+      "scope": {
+        "description": "Declared file ownership for coordination; NOT a filesystem sandbox.",
+        "properties": {
+          "owned_files": {
+            "items": {
+              "type": "string"
+            },
+            "maxItems": 100,
+            "type": "array"
+          }
+        },
+        "type": "object"
+      },
+      "verification": {
+        "anyOf": [
+          {
+            "description": "Explicit check ladder; later phases include earlier required checks.",
+            "properties": {
+              "checks": {
+                "items": {
+                  "properties": {
+                    "command": {
+                      "anyOf": [
+                        {
+                          "maxLength": 2000,
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null
+                    },
+                    "criterion": {
+                      "maxLength": 2000,
+                      "pattern": "\\S",
+                      "type": "string"
+                    },
+                    "estimated_seconds": {
+                      "anyOf": [
+                        {
+                          "maximum": 7200,
+                          "minimum": 1,
+                          "type": "integer"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null
+                    },
+                    "id": {
+                      "maxLength": 100,
+                      "pattern": "\\S",
+                      "type": "string"
+                    },
+                    "phase": {
+                      "default": "targeted",
+                      "enum": [
+                        "targeted",
+                        "candidate",
+                        "integration"
+                      ],
+                      "type": "string"
+                    },
+                    "requires_shell": {
+                      "default": false,
+                      "type": "boolean"
+                    },
+                    "scope": {
+                      "anyOf": [
+                        {
+                          "description": "Which bytes a run observed. Equal digests of the same kind are the same bytes.",
+                          "properties": {
+                            "boundaries": {
+                              "description": "What the run did not exercise (external services, other platforms, unselected files).",
+                              "items": {
+                                "maxLength": 2000,
+                                "pattern": "\\S",
+                                "type": "string"
+                              },
+                              "maxItems": 20,
+                              "type": "array"
+                            },
+                            "digest": {
+                              "pattern": "^[0-9a-f]{7,128}$",
+                              "type": "string"
+                            },
+                            "kind": {
+                              "enum": [
+                                "tree",
+                                "commit",
+                                "archive",
+                                "content"
+                              ],
+                              "type": "string"
+                            }
+                          },
+                          "required": [
+                            "kind",
+                            "digest"
+                          ],
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null,
+                      "description": "Explicit current input identity. History from other bytes remains recorded but is not a current result; omitted scope keeps ambiguous failures unresolved."
+                    }
+                  },
+                  "required": [
+                    "id",
+                    "criterion"
+                  ],
+                  "type": "object"
+                },
+                "maxItems": 50,
+                "type": "array"
+              },
+              "preparation_seconds": {
+                "default": 0,
+                "maximum": 7200,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "stage": {
+                "default": "targeted",
+                "enum": [
+                  "targeted",
+                  "candidate",
+                  "integration"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      }
+    },
+    "required": [
+      "goal"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / preflight

Added value: +{
+  "default": false,
+  "type": "boolean"
+}

Changed1 schema field changedv3.3.0Sep 10, 2026

changedInput schema / properties / execution / anyOf

Previous value: -[
-  {
-    "properties": {
-      "model": {
-        "anyOf": [
-          {
-            "minLength": 1,
-            "pattern": "\\S",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "profile": {
-        "default": "balanced",
-        "enum": [
-          "quick",
-          "balanced",
-          "deep"
-        ],
-        "type": "string"
-      },
-      "thinking": {
-        "anyOf": [
-          {
-            "enum": [
-              "off",
-              "minimal",
-              "low",
-              "medium",
-              "high",
-              "xhigh",
-              "max"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "timeout_seconds": {
-        "anyOf": [
-          {
-            "maximum": 7200,
-            "minimum": 1,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "properties": {
+      "model": {
+        "anyOf": [
+          {
+            "minLength": 1,
+            "pattern": "\\S",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "profile": {
+        "default": "balanced",
+        "description": "Profile defaults: quick: Defaults to low thinking with a 600-second deadline. balanced: Defaults to high thinking with a 1800-second deadline. deep: Defaults to high thinking with a 3600-second deadline. Uses the same thinking level as balanced with a longer deadline, not higher reasoning. These are default choices; overrides, effective settings, and actual settings are reported separately.",
+        "enum": [
+          "quick",
+          "balanced",
+          "deep"
+        ],
+        "type": "string"
+      },
+      "thinking": {
+        "anyOf": [
+          {
+            "enum": [
+              "off",
+              "minimal",
+              "low",
+              "medium",
+              "high",
+              "xhigh",
+              "max"
+            ],
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "timeout_seconds": {
+        "anyOf": [
+          {
+            "maximum": 7200,
+            "minimum": 1,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed8 schema fields changedv3.1.0Sep 9, 2026

addedInput schema / properties / execution

Added value: +{
+  "anyOf": [
+    {
+      "properties": {
+        "model": {
+          "anyOf": [
+            {
+              "minLength": 1,
+              "pattern": "\\S",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "profile": {
+          "default": "balanced",
+          "enum": [
+            "quick",
+            "balanced",
+            "deep"
+          ],
+          "type": "string"
+        },
+        "thinking": {
+          "anyOf": [
+            {
+              "enum": [
+                "off",
+                "minimal",
+                "low",
+                "medium",
+                "high",
+                "xhigh",
+                "max"
+              ],
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "timeout_seconds": {
+          "anyOf": [
+            {
+              "maximum": 7200,
+              "minimum": 1,
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

addedInput schema / properties / review_id

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

addedInput schema / properties / review_stage

Added value: +{
+  "anyOf": [
+    {
+      "enum": [
+        "independent",
+        "comparison"
+      ],
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

addedInput schema / properties / timeout_seconds / anyOf

Added value: +[
+  {
+    "maximum": 7200,
+    "minimum": 1,
+    "type": "integer"
+  },
+  {
+    "type": "null"
+  }
+]

changedInput schema / properties / timeout_seconds / default
```
Previous value: -1800New value: +null
```
removedInput schema / properties / timeout_seconds / maximum
```
Removed value: -7200
```
removedInput schema / properties / timeout_seconds / minimum
```
Removed value: -1
```
removedInput schema / properties / timeout_seconds / type
```
Removed value: -"integer"
```

First observedv3.0.1Sep 9, 2026

TDQS

A3.8/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure, and it delivers: immediate/async return, 'NOT sandboxed' for work mode, the safety-relevant statement that 'verification declares the agreed check ladder, never permission to execute it,' and the property that 'base constraints/owned files stay fixed.' These go beyond the schema and give the agent a real safety profile; a few omissions (review flow behavior, return semantics) are offset by the output schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the single most important fact (start + exclusivity + immediate return) and then builds outward into behavioral context. It is dense but economical — telegraphic fragments like 'Think: collaboration; analyze: read/search; work: edits/shell' pack meaning into few words with zero filler. Slightly telegraphic flow costs it a point, but every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

This is an exceptionally complex tool — 11 top-level parameters with a deeply nested contract schema — and the description covers the highest-priority decisions (input mode, mode semantics, preflight, permission boundaries). The output schema relieves it of documenting return values. But the review flow (review_id, review_stage) and execution tuning are unaddressed, and it does not orient the agent among the many task siblings, leaving noticeable gaps for a tool this intricate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate, and it meaningfully explains several key parameters: the mutually exclusive 'prompt or structured contract' choice, mode enum semantics, preflight behavior, project_context_id ('pins product rules/decisions'), and question_timeout_seconds (coordinator-only). However, it leaves review_id, review_stage, execution (model/profile/timeout), and timeout_seconds entirely to the schema, which is a substantial gap for a tool with 11 parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb+resource ('Start a task') plus the key constraint 'with exactly one of prompt or structured contract' and 'Returns immediately.' This clearly states what the tool does and highlights the primary caller decision. It does not explicitly name or contrast sibling tools like tandem_work or tandem_continue, so differentiation is implied rather than stated, which keeps it from a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides practical guidance on when/how to use variations: 'Use preflight=true to inspect admission without launching a worker,' the mode semantics ('Think: collaboration; analyze: read/search; work: edits/shell'), and 'Only the coordinator sets question timeout.' It explains the mode enum and preflight behavior, but never explicitly names alternatives (e.g., tandem_continue for follow-ups) or states when NOT to use this tool, so the when-not guidance is only implicit ('each follow-up has a new goal').

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.