{
  "argumentSchema": {
    "$defs": {
      "TopicAuthor": {
        "properties": {
          "avatar": {
            "type": "string"
          },
          "kind": {
            "description": "Open for the same reason `TopicLinkKind` is: this is provided data, so a\nclosed set here could never gain `\"service\"` or whatever acts next.\nWell-known values are `\"person\"` and `\"agent\"`, the latter marking an\nagent acting with its human user's key.",
            "type": "string"
          },
          "name": {
            "type": "string"
          }
        },
        "required": [
          "kind",
          "name"
        ],
        "type": "object"
      },
      "TopicComment": {
        "properties": {
          "author": {
            "$ref": "#/$defs/TopicAuthor",
            "description": "Snapshot taken at write time (profile enrichment comes later; never gate\nauthorship on a profile wish — CT-1879). Comments carry no minted id:\narray elements have stable entity identity; future editing addresses\nelements by reference (`equals()`), not by a synthetic key.\n\nOptional because durable Topics may contain a comment without structured\nauthorship. Current `addComment` calls require `agentName` and always write\nthis snapshot."
          },
          "body": {
            "default": "",
            "type": "string"
          },
          "editedAt": {
            "description": "When the body was last revised, absent on a comment never edited. The\noriginal `sentAt` and `author` are left alone: an edit changes what was\nsaid, not who said it or when the thread reached this point.",
            "type": "number"
          },
          "removedAt": {
            "description": "Set when the comment was retracted, and the retraction is the whole of\nit — the record stays, carrying what it always said. A reader hides it;\n`commentCount` stops counting it; `lastActivityOf` keeps reading its\n`sentAt`, which is what stops a retraction moving a topic backwards in\nthe board's ordering.",
            "type": "number"
          },
          "removedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "sentAt": {
            "default": 0,
            "type": "number"
          }
        },
        "required": [
          "body",
          "sentAt"
        ],
        "type": "object"
      },
      "TopicCrossrefRow": {
        "properties": {
          "mentionedBy": {
            "items": {
              "type": "unknown"
            },
            "type": "array"
          },
          "topic": {
            "description": "The topic this row is about. `unknown` because it is written as a\nreference and only ever compared — `equals` takes the raw link. Anything\nwider retrieves the piece instead of pointing at it: declared `object`,\nthis field reads back as the whole expanded topic, `$UI` tree included.",
            "type": "unknown"
          }
        },
        "required": [
          "topic",
          "mentionedBy"
        ],
        "type": "object"
      },
      "TopicLink": {
        "properties": {
          "addedAt": {
            "type": "number"
          },
          "addedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "kind": {
            "default": "web",
            "type": "string"
          },
          "label": {
            "default": "",
            "type": "string"
          },
          "removedAt": {
            "description": "As on a comment, and with one consequence of its own: a retracted link\nstops resolving into `mentions`, so the reference it contributed goes\nwith it rather than outliving the link that made it.",
            "type": "number"
          },
          "removedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "url": {
            "default": "",
            "type": "string"
          }
        },
        "required": [
          "kind",
          "url",
          "label"
        ],
        "type": "object"
      },
      "TopicMentionRef": {
        "properties": {
          "destination": {
            "type": "unknown"
          },
          "modifiedTitle": {
            "type": "boolean"
          }
        },
        "required": [
          "destination",
          "modifiedTitle"
        ],
        "type": "object"
      },
      "TopicMentionRefMap": {
        "additionalProperties": {
          "$ref": "#/$defs/TopicMentionRef"
        },
        "properties": {},
        "type": "object"
      },
      "TopicMentionable": {
        "properties": {
          "$NAME": {
            "default": "",
            "type": [
              "string",
              "undefined"
            ]
          },
          "title": {
            "default": "",
            "type": "string"
          }
        },
        "required": [
          "title",
          "$NAME"
        ],
        "type": "object"
      }
    },
    "properties": {
      "boardCrossrefs": {
        "asCell": [
          "readonly"
        ],
        "default": [],
        "description": "The board's mention pivot, one row per topic. A topic reads its own row\nout of it and nothing else; see `backlinksOf`. Absent, a topic simply shows\nno inbound references.\n\nReadable, not writable: the pivot is the board's derivation, and a topic\nhas no business writing into it. Declaring the narrower cell says so where\na reader can see it, rather than leaving it to convention.",
        "items": {
          "$ref": "#/$defs/TopicCrossrefRow"
        },
        "type": "array"
      },
      "body": {
        "asCell": [
          "cell"
        ],
        "default": "",
        "description": "The topic's living document: durable conclusions get folded up into the\nbody; the comment thread below holds the deliberation.",
        "type": "string"
      },
      "bodyUpdatedAt": {
        "asCell": [
          "cell"
        ],
        "default": 0,
        "type": "number"
      },
      "bodyUpdatedBy": {
        "$ref": "#/$defs/TopicAuthor",
        "asCell": [
          "cell"
        ],
        "default": {
          "kind": "person",
          "name": ""
        }
      },
      "comments": {
        "asCell": [
          "cell"
        ],
        "default": [],
        "items": {
          "$ref": "#/$defs/TopicComment"
        },
        "type": "array"
      },
      "createdAt": {
        "default": 0,
        "type": "number"
      },
      "createdBy": {
        "$ref": "#/$defs/TopicAuthor"
      },
      "links": {
        "asCell": [
          "cell"
        ],
        "default": [],
        "items": {
          "$ref": "#/$defs/TopicLink"
        },
        "type": "array"
      },
      "mentionable": {
        "asCell": [
          "cell"
        ],
        "default": [],
        "description": "The board's mention universe — what the body editor autocompletes\nover. Wired at creation to the board's mention index (one derived\ndocument of two-string rows; `TopicMentionableRow` in `main.tsx`), and\nrewired onto a piece from before the index as a one-time link-bind.\nA plain list of the pieces themselves also satisfies the demand — a\nboard not yet rewired, or a composer without a board. Absent, the\neditor simply offers no completions.",
        "items": {
          "$ref": "#/$defs/TopicMentionable"
        },
        "type": "array"
      },
      "mentioned": {
        "asCell": [
          "cell"
        ],
        "default": [],
        "description": "Pieces this topic references outside its prose — what `mention` records.\n\nIts own list rather than an entry in `references`, because that map belongs\nto the body editor: the editor mints its keys, rewrites its labels, and\ncollects entries whose token has left the document. A verb writing there\nwould be writing into somebody else's bookkeeping. Here there is nothing to\nkey by, because there is nothing to point back at from the prose — a\nreference outside a sentence is just a link in a list.",
        "items": {
          "type": "unknown"
        },
        "type": "array"
      },
      "references": {
        "$ref": "#/$defs/TopicMentionRefMap",
        "asCell": [
          "cell"
        ],
        "default": {},
        "description": "Where this topic's `[Label][key]` mentions point, keyed by the token that\nappears in the body. The editor owns the contents; this pattern owns the\ncell, which is what makes a mention durable and — because each entry holds\nthe destination as a REFERENCE — what makes the reference graph a question\nabout cell identity rather than about text.\n\nThe default has to match the one `TopicOutput` publishes. A map published\nunder a different default than its input carries cannot be materialized."
      },
      "title": {
        "asCell": [
          "cell"
        ],
        "default": "",
        "type": "string"
      },
      "titleUpdatedAt": {
        "asCell": [
          "cell"
        ],
        "default": 0,
        "type": "number"
      },
      "titleUpdatedBy": {
        "$ref": "#/$defs/TopicAuthor",
        "asCell": [
          "cell"
        ],
        "default": {
          "kind": "person",
          "name": ""
        },
        "description": "Attribution of the last rename, stamped by `setTitle` — the same pair\nthe body keeps, because a title is the other editable scalar."
      }
    },
    "type": "object"
  },
  "pattern": "topics/topic.tsx",
  "resultSchema": {
    "$defs": {
      "AddCommentEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "body": {
            "description": "The comment text, appended verbatim after trimming. Must be non-empty:\nan empty body rejects rather than recording a blank thread entry.",
            "type": "string"
          }
        },
        "required": [
          "body",
          "agentName"
        ],
        "type": "object"
      },
      "AddLinkEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "kind": {
            "description": "What the link points at — a rendering hint, not a behavior switch.\nOptional because the handler defaults it to `\"web\"`, and a caller should\nnot be made to supply a field the verb never needed.",
            "type": "string"
          },
          "label": {
            "description": "Display label. Optional, and a blank one falls back to the URL.",
            "type": "string"
          },
          "url": {
            "description": "The link target. Must be http(s): anything else rejects, because a\nuser-supplied scheme on a shared surface is script execution in every\nviewer's session.",
            "type": "string"
          }
        },
        "required": [
          "url",
          "agentName"
        ],
        "type": "object"
      },
      "EditCommentEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "body": {
            "description": "The complete replacement text, trimmed. Must be non-empty: emptying a\ncomment is a retraction, and `removeComment` is what says so.",
            "type": "string"
          },
          "comment": {
            "description": "The comment to revise, named and checked as in `RemoveCommentEvent`,\nand additionally naming `body`, which this verb writes.",
            "properties": {
              "body": {
                "default": "",
                "type": "string"
              },
              "editedAt": {
                "type": "number"
              },
              "removedAt": {
                "type": "number"
              },
              "sentAt": {
                "default": 0,
                "type": "number"
              }
            },
            "required": [
              "sentAt",
              "body"
            ],
            "type": "object"
          }
        },
        "required": [
          "comment",
          "body",
          "agentName"
        ],
        "type": "object"
      },
      "MentionEvent": {
        "properties": {
          "topic": {
            "description": "The piece to reference — the piece itself, not an address. Identity here\nis the cell, so this is what a caller passes and what gets stored.\n\nDeclared through the one field every Topic has rather than `unknown`. The\ncell declaration marks this as a reference position, so the CLI resolves a\ncanonical `/of:...` value from an inline JSON event into the live piece\nlink. It also bounds the validation read: `topic.get()` is `undefined` for\na value that is not a reference and an object for any piece, and `mention`\nchecks it before storing anything.\n\n`title` is also the most this can safely name: this schema reaches every\ntopic in `mentionable`, so a property without a default would be demanded\nof topics written before it existed and refuse their update. `title`\ncarries one, and that default does double duty — it is also why the check\nadmits a piece that is not a topic at all, which reads back `{ title: \"\" }`\nrather than `undefined`. `deno task pattern-vintage` proves the update side\nby replaying a real board.\n\nNothing reads THROUGH it beyond that one field — the value is stored and\ncompared.",
            "properties": {
              "title": {
                "default": "",
                "type": "string"
              }
            },
            "required": [
              "title"
            ],
            "type": "object"
          }
        },
        "required": [
          "topic"
        ],
        "type": "object"
      },
      "RemoveCommentEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "comment": {
            "description": "The comment to retract — the stored element, not a copy of its fields.\nNames only what this verb reads and writes, for the reason\n`MentionEvent.topic` names only `title`: the declaration bounds the\nvalidation read, and a payload that is not a reference reads back\n`undefined` and is refused rather than silently matching nothing.\n`sentAt` carries a default, so it is what makes a real element read back\nas an object; the stamp fields are optional, which is what lets this\nschema reach comments written before they existed.",
            "properties": {
              "removedAt": {
                "type": "number"
              },
              "removedBy": {
                "$ref": "#/$defs/TopicAuthor"
              },
              "sentAt": {
                "default": 0,
                "type": "number"
              }
            },
            "required": [
              "sentAt"
            ],
            "type": "object"
          }
        },
        "required": [
          "comment",
          "agentName"
        ],
        "type": "object"
      },
      "RemoveLinkEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "link": {
            "description": "The stored link element. What a reader passes, from the row it renders.\nNamed as in `RemoveCommentEvent`, with `url` playing the defaulted-field\nrole `sentAt` plays there.",
            "properties": {
              "removedAt": {
                "type": "number"
              },
              "removedBy": {
                "$ref": "#/$defs/TopicAuthor"
              },
              "url": {
                "default": "",
                "type": "string"
              }
            },
            "required": [
              "url"
            ],
            "type": "object"
          },
          "url": {
            "description": "The link's URL, for a caller that cannot pass a reference. Retracts the\nmost recently added link still present with this URL, so retracting twice\nretracts two rather than re-stamping one.\n\nSequentially. Two concurrent retractions naming the same URL both resolve\nthe same newest-present element and merge into one stamped record, so\nthey retract one link between them rather than two. Naming the link by\nreference is what makes a caller's target unambiguous under concurrency;\nthis spelling trades that for being reachable at all.",
            "type": "string"
          }
        },
        "required": [
          "agentName"
        ],
        "type": "object"
      },
      "SetBodyEvent": {
        "properties": {
          "agentName": {
            "description": "Explicit content-level signature for an agent using its human user's\nidentity key. Fabric authenticates the write with that key; this says\nwhich agent acted under it.\n\nRequired so every authored-content call carries structured attribution.\nAuthenticated execution provenance can supersede the field by relaxing it\nto optional without breaking existing callers.",
            "type": "string"
          },
          "body": {
            "description": "The complete replacement body, persisted verbatim — no trimming, so\nwhitespace-sensitive Markdown survives. An empty body is legal: clearing\na living document is an edit, not an error.",
            "type": "string"
          }
        },
        "required": [
          "body",
          "agentName"
        ],
        "type": "object"
      },
      "SetTitleEvent": {
        "properties": {
          "agentName": {
            "description": "The agent making this mutation, stored as structured attribution beside\nthe write time. Required so every successful rename is attributed.",
            "type": "string"
          },
          "title": {
            "description": "The new title, trimmed before it is stored. Must be non-empty.",
            "type": "string"
          }
        },
        "required": [
          "title",
          "agentName"
        ],
        "type": "object"
      },
      "TopicAuthor": {
        "properties": {
          "avatar": {
            "type": "string"
          },
          "kind": {
            "description": "Open for the same reason `TopicLinkKind` is: this is provided data, so a\nclosed set here could never gain `\"service\"` or whatever acts next.\nWell-known values are `\"person\"` and `\"agent\"`, the latter marking an\nagent acting with its human user's key.",
            "type": "string"
          },
          "name": {
            "type": "string"
          }
        },
        "required": [
          "kind",
          "name"
        ],
        "type": "object"
      },
      "TopicComment": {
        "properties": {
          "author": {
            "$ref": "#/$defs/TopicAuthor",
            "description": "Snapshot taken at write time (profile enrichment comes later; never gate\nauthorship on a profile wish — CT-1879). Comments carry no minted id:\narray elements have stable entity identity; future editing addresses\nelements by reference (`equals()`), not by a synthetic key.\n\nOptional because durable Topics may contain a comment without structured\nauthorship. Current `addComment` calls require `agentName` and always write\nthis snapshot."
          },
          "body": {
            "default": "",
            "type": "string"
          },
          "editedAt": {
            "description": "When the body was last revised, absent on a comment never edited. The\noriginal `sentAt` and `author` are left alone: an edit changes what was\nsaid, not who said it or when the thread reached this point.",
            "type": "number"
          },
          "removedAt": {
            "description": "Set when the comment was retracted, and the retraction is the whole of\nit — the record stays, carrying what it always said. A reader hides it;\n`commentCount` stops counting it; `lastActivityOf` keeps reading its\n`sentAt`, which is what stops a retraction moving a topic backwards in\nthe board's ordering.",
            "type": "number"
          },
          "removedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "sentAt": {
            "default": 0,
            "type": "number"
          }
        },
        "required": [
          "body",
          "sentAt"
        ],
        "type": "object"
      },
      "TopicLink": {
        "properties": {
          "addedAt": {
            "type": "number"
          },
          "addedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "kind": {
            "default": "web",
            "type": "string"
          },
          "label": {
            "default": "",
            "type": "string"
          },
          "removedAt": {
            "description": "As on a comment, and with one consequence of its own: a retracted link\nstops resolving into `mentions`, so the reference it contributed goes\nwith it rather than outliving the link that made it.",
            "type": "number"
          },
          "removedBy": {
            "$ref": "#/$defs/TopicAuthor"
          },
          "url": {
            "default": "",
            "type": "string"
          }
        },
        "required": [
          "kind",
          "url",
          "label"
        ],
        "type": "object"
      },
      "TopicMentionRef": {
        "properties": {
          "destination": {
            "type": "unknown"
          },
          "modifiedTitle": {
            "type": "boolean"
          }
        },
        "required": [
          "destination",
          "modifiedTitle"
        ],
        "type": "object"
      },
      "TopicMentionRefMap": {
        "additionalProperties": {
          "$ref": "#/$defs/TopicMentionRef"
        },
        "properties": {},
        "type": "object"
      },
      "TopicSummary": {
        "properties": {
          "commentCount": {
            "default": 0,
            "type": [
              "number",
              "undefined"
            ]
          },
          "createdAt": {
            "description": "When the topic was filed (epoch milliseconds), stamped at create.",
            "type": "number"
          },
          "createdBy": {
            "anyOf": [
              {
                "$ref": "#/$defs/TopicAuthor"
              },
              {
                "type": "undefined"
              }
            ],
            "default": {
              "kind": "person",
              "name": ""
            }
          },
          "lastActivityAt": {
            "default": 0,
            "type": [
              "number",
              "undefined"
            ]
          },
          "title": {
            "default": "",
            "description": "The topic's title. Defaulted rather than required, like every other\nfield a board card renders: the card list is a mapped sub-pattern, so\nthis type reaches a piece holding topics written before the field\nexisted as the argument schema its update is checked against, and a\nrequired property those topics lack refuses that update outright.\n`deno task pattern-vintage` is what catches it, by replaying a real\ndeployed board.",
            "type": "string"
          }
        },
        "required": [
          "title",
          "createdAt",
          "commentCount",
          "lastActivityAt"
        ],
        "type": "object"
      },
      "UnmentionEvent": {
        "properties": {
          "topic": {
            "description": "Declared and checked exactly as `MentionEvent.topic` is, and for the same\nreason: a payload that is not a reference matches no stored entry, so\nwithout the check it would remove nothing and report success.",
            "properties": {
              "title": {
                "default": "",
                "type": "string"
              }
            },
            "required": [
              "title"
            ],
            "type": "object"
          }
        },
        "required": [
          "topic"
        ],
        "type": "object"
      }
    },
    "description": "A #topic — one durable unit of shared attention: a title, a living body\ndocument, a flat chronological comment thread, typed links out to other\ncore objects (PRs, agent sessions, web pages), and the references it makes\nto sibling pieces.\n\nDurable conclusions get folded up into the body — revise it whole with\n`setBody`; the thread holds the deliberation as point-in-time `addComment`\nrecords. The thread only ever grows: `removeComment` and `removeLink` stamp\na record as retracted and leave it where it is, and `editComment` revises a\nbody in place, so what a reader shows is the array filtered rather than the\narray itself. Sign every authored-content mutation with `agentName`:\nFabric records the human principal behind the key; the name says which\nagent acted under it. Reference-only `mention` and `unmention` calls carry\nno content signature. The session-draft cells and `submit*` streams below\nbelong to the rendered page, not the headless contract — they read state\nonly this session holds.",
    "properties": {
      "$NAME": {
        "default": "",
        "description": "The topic's display name. Like the other derived display fields, a cold\nretained topic may not have produced this path yet; its persisted title\nremains authoritative until it does.",
        "type": [
          "string",
          "undefined"
        ]
      },
      "$UI": {
        "$ref": "https://commonfabric.org/schemas/vnode.json"
      },
      "addComment": {
        "$ref": "#/$defs/AddCommentEvent",
        "asCell": [
          "stream"
        ],
        "description": "Append to the thread — a point-in-time record of progress or\ndeliberation; durable conclusions belong in the body. Returns the\ncomment as recorded, resolved author and `sentAt` included."
      },
      "addLink": {
        "$ref": "#/$defs/AddLinkEvent",
        "asCell": [
          "stream"
        ],
        "description": "Attach a typed outbound link — a PR, an agent session, a web page.\nReturns the link as recorded, resolved `addedBy` and `addedAt`\nincluded. Appends merge and nothing dedupes: a repeated URL is two\nentries."
      },
      "body": {
        "default": "",
        "description": "The living document, verbatim Markdown. `setBody` replaces it whole.",
        "type": "string"
      },
      "bodyDraft": {
        "type": "string"
      },
      "bodyUpdatedAt": {
        "type": [
          "number",
          "undefined"
        ]
      },
      "bodyUpdatedBy": {
        "anyOf": [
          {
            "type": "undefined"
          },
          {
            "$ref": "#/$defs/TopicAuthor"
          }
        ]
      },
      "cancelEditBody": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: close the body editor; the session drafts are the discard.",
        "tier": "wrapper"
      },
      "cancelEditTitle": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: close the rename editor; the session draft is the discard.",
        "tier": "wrapper"
      },
      "commentCount": {
        "default": 0,
        "type": [
          "number",
          "undefined"
        ]
      },
      "commentDraft": {
        "description": "Session-local composer/edit state. These controls belong to a direct Topic\ninstance, not the shared TopicPiece projection used by the tracker's list.",
        "type": "string"
      },
      "comments": {
        "description": "The thread, in arrival order, each record carrying its author snapshot\nand `sentAt`.\n\nMEMBERSHIP is append-only; a record is not. Nothing is ever removed from\nthis array — `removeComment` stamps `removedAt` and leaves the record in\nplace, and `editComment` revises a body and stamps `editedAt` — so a\nreader that wants the live thread filters on `removedAt` rather than\ntaking the array as it stands. `commentCount` is that filtered count.",
        "items": {
          "$ref": "#/$defs/TopicComment"
        },
        "type": "array"
      },
      "createdAt": {
        "description": "When the topic was filed (epoch milliseconds), stamped at create.",
        "type": "number"
      },
      "createdBy": {
        "anyOf": [
          {
            "$ref": "#/$defs/TopicAuthor"
          },
          {
            "type": "undefined"
          }
        ],
        "default": {
          "kind": "person",
          "name": ""
        }
      },
      "editComment": {
        "$ref": "#/$defs/EditCommentEvent",
        "asCell": [
          "stream"
        ],
        "description": "Revise a comment's body in place, naming it by reference. Stamps\n`editedAt` and leaves `author` and `sentAt` as they were. Outside the\nprojection for the reason `removeComment` states."
      },
      "editingBody": {
        "scope": "session",
        "type": "boolean"
      },
      "editingTitle": {
        "scope": "session",
        "type": "boolean"
      },
      "lastActivityAt": {
        "default": 0,
        "type": [
          "number",
          "undefined"
        ]
      },
      "linkKindDraft": {
        "type": "string"
      },
      "linkLabelDraft": {
        "type": "string"
      },
      "linkUrlDraft": {
        "type": "string"
      },
      "links": {
        "description": "Typed outbound links, in arrival order, each carrying its author snapshot\nand `addedAt`. Append-only in membership on the same terms as `comments`:\n`removeLink` stamps rather than removes, and a stamped link additionally\nstops resolving into `mentions`.",
        "items": {
          "$ref": "#/$defs/TopicLink"
        },
        "type": "array"
      },
      "mention": {
        "$ref": "#/$defs/MentionEvent",
        "asCell": [
          "stream"
        ],
        "description": "Reference another piece from this topic — the payload is the piece\nitself, stored as a reference. Takes no `agentName` and returns no value;\nFabric retains the authenticated principal behind the edge."
      },
      "mentioned": {
        "default": [],
        "description": "Pieces referenced outside the prose, recorded by `mention`.",
        "items": {
          "type": "unknown"
        },
        "type": "array"
      },
      "mentions": {
        "default": [],
        "description": "Every piece this topic's prose and links point at, as references.\n\nThe board's pivot is declared over this and nothing else, so what one topic\ncosts a full-board scan is exactly this list of identities. Declared\n`unknown[]` because these are references, and comparing them never reads\nwhat is behind them.\n\nThe cell annotation that makes them comparable belongs to the READER, not\nhere: the pivot declares its own view of this list as\n`TopicMentionSource.mentions: ComparableCell<unknown>[]`, and that is what\nmakes its graph settle rather than depend on load order. A published\n`unknown[]` is what each reader annotates for itself.\n\nThe default stands alone: a declared default and `| undefined` collide,\nand the default is what a topic deployed before this path existed\nmaterializes against.",
        "items": {
          "type": "unknown"
        },
        "type": "array"
      },
      "referencedBy": {
        "default": [],
        "description": "The topics that mention this one, read out of the board's pivot.\n\nDeclared through `TopicSummary` rather than `TopicPiece`, and that is\nload-bearing rather than stingy: a topic whose backlinks were topics would\nbe a type that contains itself, and resolving one from a list would walk\nthe graph. The summary carries no reference of its own, so it terminates.\nA reader that wants more follows the link, which resolves whole.",
        "items": {
          "$ref": "#/$defs/TopicSummary"
        },
        "type": "array"
      },
      "references": {
        "$ref": "#/$defs/TopicMentionRefMap",
        "default": {},
        "description": "Where this topic's `[Label][key]` mentions point. Durable content, like\n`links`. The body editor works on a session copy of this map, which a save\npublishes here whole, beside the prose whose tokens name its entries."
      },
      "referencesDraft": {
        "$ref": "#/$defs/TopicMentionRefMap",
        "description": "The body draft's mention map, staged so Cancel can discard it.\n\n`cf-code-editor` writes an entry the moment a mention is inserted and\ndrops one the moment its token leaves the document, neither of them\nwaiting for Save. Pointed at the durable map while `$value` holds a\nsession draft, those writes would outlive a discarded edit: a canceled\ninsertion would leave an edge no token names, and a canceled deletion\nwould strip the destination from a token the durable body still carries.\nThe editor's own ordering assumes its two bindings share a lifetime, so\nthis gives them one."
      },
      "removeComment": {
        "$ref": "#/$defs/RemoveCommentEvent",
        "asCell": [
          "stream"
        ],
        "description": "Retract a comment, naming it by reference. The record is stamped rather\nthan deleted, so the thread keeps its evidence while a reader stops\nshowing it and `commentCount` stops counting it.\n\nHere rather than on `TopicPiece`, for the reason `setTitle` is: boards\nstore that projection, so it is a demand on every topic they already\nhold, and a required verb added to it would refuse every one deployed\nbefore the verb existed. A verb has no default to be rescued by, so there\nis no compatible way to demand a new one. Addressing the topic directly\nreaches all three of these."
      },
      "removeLink": {
        "$ref": "#/$defs/RemoveLinkEvent",
        "asCell": [
          "stream"
        ],
        "description": "Retract a link, by reference or by `url`. Stamped like a comment, and a\nretracted link stops resolving into `mentions`. The url spelling exists\nbecause a link record carries no fid for a CLI caller to name. Outside\nthe projection for the reason `removeComment` states."
      },
      "saveBody": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: publish the session body and mention-map drafts whole,\nattributed to the viewer's Profile — the contract verb is `setBody`.",
        "tier": "wrapper"
      },
      "saveTitle": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: save the session title draft under the viewer's Profile —\nthe contract verb is `setTitle`, and both land through the same core, so\na browser rename stamps the same attribution and moves the same activity\nclock.",
        "tier": "wrapper"
      },
      "setBody": {
        "$ref": "#/$defs/SetBodyEvent",
        "asCell": [
          "stream"
        ],
        "description": "Replace the living document whole — read it, revise it, write it back\ncomplete; the body is one value with whole-value conflict semantics.\nRequires `agentName` and returns the persisted body with its attribution."
      },
      "setTitle": {
        "$ref": "#/$defs/SetTitleEvent",
        "asCell": [
          "stream"
        ],
        "description": "Rename the topic. Requires `agentName` and returns the persisted title\nwith its attribution. This direct-address verb stays outside the board's\nnarrow `TopicPiece` demand."
      },
      "startEditBody": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: open the body editor, seeding the session drafts from the\ndurable body and mention map.",
        "tier": "wrapper"
      },
      "startEditTitle": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: open the rename editor, seeding the session draft from the\ndurable title.",
        "tier": "wrapper"
      },
      "submitComment": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: append the session comment draft under the viewer's\nProfile. Reads session-local state, so it is a silent no-op headless —\nthe contract verb is `addComment`.",
        "tier": "wrapper"
      },
      "submitLink": {
        "asCell": [
          "stream",
          "opaque"
        ],
        "description": "UI wrapper: append the session link drafts under the viewer's Profile —\nthe contract verb is `addLink`.",
        "tier": "wrapper"
      },
      "title": {
        "default": "",
        "description": "The topic's title. Defaulted rather than required, like every other\nfield a board card renders: the card list is a mapped sub-pattern, so\nthis type reaches a piece holding topics written before the field\nexisted as the argument schema its update is checked against, and a\nrequired property those topics lack refuses that update outright.\n`deno task pattern-vintage` is what catches it, by replaying a real\ndeployed board.",
        "type": "string"
      },
      "titleDraft": {
        "type": "string"
      },
      "titleUpdatedAt": {
        "type": [
          "number",
          "undefined"
        ]
      },
      "titleUpdatedBy": {
        "anyOf": [
          {
            "type": "undefined"
          },
          {
            "$ref": "#/$defs/TopicAuthor"
          }
        ],
        "description": "Attribution of the last rename; unset until the first `setTitle`.\nBeside `setTitle` rather than on the projection, for the same reason."
      },
      "unmention": {
        "$ref": "#/$defs/UnmentionEvent",
        "asCell": [
          "stream"
        ],
        "description": "Stop referencing a piece: removes every `mention`-made entry naming it.\nReferences made in the prose are retracted by editing the prose, not by\nthis. Takes no `agentName` and returns no value."
      }
    },
    "required": [
      "commentDraft",
      "bodyDraft",
      "editingBody",
      "titleDraft",
      "editingTitle",
      "linkUrlDraft",
      "linkLabelDraft",
      "linkKindDraft",
      "referencesDraft",
      "setTitle",
      "removeComment",
      "editComment",
      "removeLink",
      "startEditTitle",
      "saveTitle",
      "cancelEditTitle",
      "submitComment",
      "startEditBody",
      "saveBody",
      "cancelEditBody",
      "submitLink",
      "$UI",
      "body",
      "comments",
      "links",
      "mentions",
      "references",
      "mentioned",
      "referencedBy",
      "addComment",
      "addLink",
      "setBody",
      "mention",
      "unmention",
      "$NAME",
      "title",
      "createdAt",
      "commentCount",
      "lastActivityAt"
    ],
    "tags": [
      "topic"
    ],
    "type": "object"
  }
}