{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://example.invalid/mosaic/chat-01/draft-2",
  "title": "CHAT-01 draft contracts, not an implemented API",
  "description": "Closed proposal shapes. Stateful authorization, runtime compatibility, privacy and effect proof require separate enforcement. No credentials or arbitrary paths.",
  "oneOf": [
    {
      "$ref": "#/$defs/binding"
    },
    {
      "$ref": "#/$defs/grant"
    },
    {
      "$ref": "#/$defs/connection"
    },
    {
      "$ref": "#/$defs/clientRequest"
    },
    {
      "$ref": "#/$defs/request"
    },
    {
      "$ref": "#/$defs/receipt"
    },
    {
      "$ref": "#/$defs/entry"
    },
    {
      "$ref": "#/$defs/event"
    },
    {
      "$ref": "#/$defs/cursor"
    },
    {
      "$ref": "#/$defs/page"
    },
    {
      "$ref": "#/$defs/catalogueItem"
    },
    {
      "$ref": "#/$defs/upload"
    },
    {
      "$ref": "#/$defs/draft"
    },
    {
      "$ref": "#/$defs/queueItem"
    },
    {
      "$ref": "#/$defs/approval"
    },
    {
      "$ref": "#/$defs/confirmation"
    },
    {
      "$ref": "#/$defs/stop"
    },
    {
      "$ref": "#/$defs/frozenPayload"
    },
    {
      "$ref": "#/$defs/nativeDecision"
    },
    {
      "$ref": "#/$defs/cohortProof"
    },
    {
      "$ref": "#/$defs/effectReport"
    },
    {
      "$ref": "#/$defs/turnProof"
    },
    {
      "$ref": "#/$defs/draftListing"
    },
    {
      "$ref": "#/$defs/clientView"
    }
  ],
  "$defs": {
    "id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$"
    },
    "digest": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$"
    },
    "time": {
      "type": "string",
      "format": "date-time",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d{1,3})?Z$"
    },
    "generation": {
      "type": "integer",
      "minimum": 1,
      "maximum": 9007199254740991
    },
    "ids": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/id"
      },
      "maxItems": 100,
      "uniqueItems": true
    },
    "target": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "conversation": {
          "$ref": "#/$defs/id"
        },
        "branch": {
          "$ref": "#/$defs/id"
        },
        "execution": {
          "$ref": "#/$defs/id"
        },
        "controllerGeneration": {
          "$ref": "#/$defs/generation"
        }
      },
      "required": [
        "conversation",
        "branch",
        "execution",
        "controllerGeneration"
      ]
    },
    "scope": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "host": {
          "$ref": "#/$defs/id"
        },
        "seat": {
          "$ref": "#/$defs/id"
        },
        "project": {
          "$ref": "#/$defs/id"
        },
        "workspace": {
          "$ref": "#/$defs/id"
        },
        "conversation": {
          "$ref": "#/$defs/id"
        }
      },
      "required": [
        "host",
        "seat",
        "project",
        "workspace",
        "conversation"
      ]
    },
    "capabilities": {
      "type": "array",
      "items": {
        "enum": [
          "observe",
          "send",
          "take-control",
          "approve",
          "interrupt",
          "force-stop",
          "recover",
          "recover-control",
          "draft",
          "upload",
          "confirm"
        ]
      },
      "maxItems": 11,
      "uniqueItems": true
    },
    "binding": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "binding"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "scope": {
          "$ref": "#/$defs/scope"
        },
        "harness": {
          "enum": [
            "pi",
            "claude-code"
          ]
        },
        "nativeSession": {
          "$ref": "#/$defs/id"
        },
        "branch": {
          "$ref": "#/$defs/id"
        },
        "execution": {
          "$ref": "#/$defs/id"
        },
        "engineDigest": {
          "$ref": "#/$defs/digest"
        },
        "configDigest": {
          "$ref": "#/$defs/digest"
        },
        "policyRevision": {
          "$ref": "#/$defs/id"
        },
        "sourceRootRef": {
          "$ref": "#/$defs/id"
        },
        "snapshotDigest": {
          "$ref": "#/$defs/digest"
        },
        "cohortRef": {
          "$ref": "#/$defs/id"
        },
        "controllerGeneration": {
          "$ref": "#/$defs/generation"
        },
        "controllerConnection": {
          "anyOf": [
            {
              "$ref": "#/$defs/id"
            },
            {
              "type": "null"
            }
          ]
        },
        "state": {
          "enum": [
            "reserved",
            "active",
            "stopping",
            "uncertain",
            "stopped"
          ]
        },
        "admission": {
          "enum": [
            "closed",
            "open"
          ]
        },
        "createdAt": {
          "$ref": "#/$defs/time"
        },
        "stop": {
          "anyOf": [
            {
              "$ref": "#/$defs/id"
            },
            {
              "type": "null"
            }
          ]
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "scope",
        "harness",
        "nativeSession",
        "branch",
        "execution",
        "engineDigest",
        "configDigest",
        "policyRevision",
        "sourceRootRef",
        "snapshotDigest",
        "cohortRef",
        "controllerGeneration",
        "controllerConnection",
        "state",
        "admission",
        "createdAt",
        "stop"
      ]
    },
    "grant": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "grant"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "revision": {
          "$ref": "#/$defs/id"
        },
        "actor": {
          "$ref": "#/$defs/id"
        },
        "scope": {
          "$ref": "#/$defs/scope"
        },
        "capabilities": {
          "$ref": "#/$defs/capabilities"
        },
        "state": {
          "enum": [
            "active",
            "revoked"
          ]
        },
        "expiresAt": {
          "$ref": "#/$defs/time"
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "revision",
        "actor",
        "scope",
        "capabilities",
        "state",
        "expiresAt"
      ]
    },
    "connection": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "connection"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "actor": {
          "$ref": "#/$defs/id"
        },
        "grant": {
          "$ref": "#/$defs/id"
        },
        "grantRevision": {
          "$ref": "#/$defs/id"
        },
        "conversation": {
          "$ref": "#/$defs/id"
        },
        "mode": {
          "enum": [
            "observer",
            "controller"
          ]
        },
        "transport": {
          "enum": [
            "local-browser",
            "local-terminal",
            "private-host"
          ]
        },
        "state": {
          "enum": [
            "connected",
            "disconnected",
            "revoked"
          ]
        },
        "authenticatedChannelRef": {
          "$ref": "#/$defs/id"
        },
        "createdAt": {
          "$ref": "#/$defs/time"
        },
        "generation": {
          "$ref": "#/$defs/generation"
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "actor",
        "grant",
        "grantRevision",
        "conversation",
        "mode",
        "transport",
        "state",
        "authenticatedChannelRef",
        "createdAt",
        "generation"
      ]
    },
    "command": {
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "observe"
            },
            "cursor": {
              "anyOf": [
                {
                  "$ref": "#/$defs/id"
                },
                {
                  "type": "null"
                }
              ]
            },
            "limit": {
              "type": "integer",
              "minimum": 1,
              "maximum": 100
            }
          },
          "required": [
            "operation",
            "cursor",
            "limit"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "prompt"
            },
            "draft": {
              "$ref": "#/$defs/id"
            },
            "draftRevision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "draft",
            "draftRevision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "takeover"
            }
          },
          "required": [
            "operation"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "edit-queued"
            },
            "item": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            },
            "draft": {
              "$ref": "#/$defs/id"
            },
            "draftRevision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "item",
            "revision",
            "draft",
            "draftRevision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "cancel-queued"
            },
            "item": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "item",
            "revision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "approval"
            },
            "approval": {
              "$ref": "#/$defs/id"
            },
            "choice": {
              "$ref": "#/$defs/id"
            },
            "intentDigest": {
              "$ref": "#/$defs/digest"
            }
          },
          "required": [
            "operation",
            "approval",
            "choice",
            "intentDigest"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "interrupt"
            }
          },
          "required": [
            "operation"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "force-stop"
            },
            "confirmation": {
              "$ref": "#/$defs/id"
            }
          },
          "required": [
            "operation",
            "confirmation"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "recover"
            },
            "stop": {
              "$ref": "#/$defs/id"
            },
            "confirmation": {
              "$ref": "#/$defs/id"
            }
          },
          "required": [
            "operation",
            "stop",
            "confirmation"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "acquire-recovery-control"
            },
            "confirmation": {
              "$ref": "#/$defs/id"
            }
          },
          "required": [
            "operation",
            "confirmation"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "list-drafts"
            },
            "cursor": {
              "anyOf": [
                {
                  "$ref": "#/$defs/id"
                },
                {
                  "type": "null"
                }
              ]
            },
            "limit": {
              "type": "integer",
              "minimum": 1,
              "maximum": 100
            }
          },
          "required": [
            "operation",
            "cursor",
            "limit"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "create-draft"
            },
            "text": {
              "type": "string",
              "minLength": 0,
              "maxLength": 262144
            }
          },
          "required": [
            "operation",
            "text"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "update-draft"
            },
            "draft": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            },
            "text": {
              "type": "string",
              "minLength": 0,
              "maxLength": 262144
            },
            "attachments": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/id"
              },
              "maxItems": 10,
              "uniqueItems": true
            }
          },
          "required": [
            "operation",
            "draft",
            "revision",
            "text",
            "attachments"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "discard-draft"
            },
            "draft": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "draft",
            "revision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "begin-upload"
            },
            "filename": {
              "type": "string",
              "minLength": 1,
              "maxLength": 255
            },
            "mimeType": {
              "type": "string",
              "minLength": 1,
              "maxLength": 127
            },
            "size": {
              "type": "integer",
              "minimum": 1,
              "maximum": 20971520
            },
            "digest": {
              "$ref": "#/$defs/digest"
            }
          },
          "required": [
            "operation",
            "filename",
            "mimeType",
            "size",
            "digest"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "append-upload"
            },
            "upload": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            },
            "offset": {
              "type": "integer",
              "minimum": 0,
              "maximum": 20971520
            },
            "dataBase64": {
              "type": "string",
              "minLength": 4,
              "maxLength": 349528,
              "pattern": "^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$"
            }
          },
          "required": [
            "operation",
            "upload",
            "revision",
            "offset",
            "dataBase64"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "complete-upload"
            },
            "upload": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "upload",
            "revision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "discard-upload"
            },
            "upload": {
              "$ref": "#/$defs/id"
            },
            "revision": {
              "$ref": "#/$defs/generation"
            }
          },
          "required": [
            "operation",
            "upload",
            "revision"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "issue-confirmation"
            },
            "operationToConfirm": {
              "enum": [
                "force-stop",
                "recover",
                "acquire-recovery-control"
              ]
            }
          },
          "required": [
            "operation",
            "operationToConfirm"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "operation": {
              "const": "answer-confirmation"
            },
            "confirmation": {
              "$ref": "#/$defs/id"
            },
            "answer": {
              "enum": [
                "confirm",
                "cancel"
              ]
            }
          },
          "required": [
            "operation",
            "confirmation",
            "answer"
          ]
        }
      ]
    },
    "clientRequest": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "clientRequest"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "connection": {
          "$ref": "#/$defs/id"
        },
        "target": {
          "$ref": "#/$defs/target"
        },
        "command": {
          "$ref": "#/$defs/command"
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "connection",
        "target",
        "command"
      ]
    },
    "request": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "request"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "clientRequest": {
          "$ref": "#/$defs/id"
        },
        "connection": {
          "$ref": "#/$defs/id"
        },
        "actor": {
          "$ref": "#/$defs/id"
        },
        "grant": {
          "$ref": "#/$defs/id"
        },
        "grantRevision": {
          "$ref": "#/$defs/id"
        },
        "target": {
          "$ref": "#/$defs/target"
        },
        "operationDigest": {
          "$ref": "#/$defs/digest"
        },
        "command": {
          "$ref": "#/$defs/command"
        },
        "admittedAt": {
          "$ref": "#/$defs/time"
        },
        "frozenPayload": {
          "anyOf": [
            {
              "$ref": "#/$defs/id"
            },
            {
              "type": "null"
            }
          ]
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "clientRequest",
        "connection",
        "actor",
        "grant",
        "grantRevision",
        "target",
        "operationDigest",
        "command",
        "admittedAt",
        "frozenPayload"
      ]
    },
    "receipt": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "version": {
          "const": 2
        },
        "kind": {
          "const": "receipt"
        },
        "id": {
          "$ref": "#/$defs/id"
        },
        "request": {
          "$ref": "#/$defs/id"
        },
        "target": {
          "$ref": "#/$defs/target"
        },
        "state": {
          "enum": [
            "admitted",
            "queued",
            "dispatched",
            "acknowledged",
            "working",
            "finished",
            "failed",
            "rejected",
            "delivery-unknown",
            "recovered-as-draft",
            "recovery-failed",
            "dispatch-refused"
          ]
        },
        "revision": {
          "$ref": "#/$defs/generation"
        },
        "reasonCode": {
          "anyOf": [
            {
              "$ref": "#/$defs/id"
            },
            {
              "type": "null"
            }
          ]
        },
        "event": {
          "anyOf": [
            {
              "$ref": "#/$defs/id"
            },
            {
              "type": "null"
            }
          ]
        },
        "createdAt": {
          "$ref": "#/$defs/time"
        }
      },
      "required": [
        "version",
        "kind",
        "id",
        "request",
        "target",
        "state",
        "revision",
        "reasonCode",
        "event",
        "createdAt"
      ]
    },
    "contentBlock": {
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "type": {
              "const": "text"
            },
            "text": {
              "type": "string",
              "minLength": 0,
              "maxLength": 262144
            },
            "block": {
              "type": "integer",
              "minimum": 0,
              "maximum": 9007199254740991
            },
            "fragment": {
              "type": "integer",
              "minimum": 0,
              "maximum": 9007199254740991
            },
            "lastFragment": {
              "type": "boolean"
            }
          },
          "required": [
            "type",
            "text",
            "block",
            "fragment",
            "lastFragment"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "type": {
              "const": "thinking"
            },
            "text": {
              "type": "string",
              "minLength": 0,
              "maxLength": 262144
            },
            "visibility": {
              "enum": [
                "permitted-visible",
                "unavailable"
              ]
            },
            "block": {
              "type": "integer",
              "minimum": 0,
              "maximum": 9007199254740991
            },
            "fragment": {
              "type": "integer",
              "minimum": 0,
              "maximum": 9007199254740991
            },
            "lastFragment": {
              "type": "boolean"
            }
          },
          "required": [
            "type",
            "text",
            "visibility",
            "block",
            "fragment",
            "lastFragment"
          ],
          "allOf": [
            {
              "if": {
                "properties": {
                  "visibility": {
                    "const": "unavailable"
                  }
                }
              },
              "then": {
                "properties": {
                  "text": {
                    "const": ""
                  }
                }
              }
            }
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