const w = await mn.api('/writing/capabilities');
if (!w) return;
mn.log(w.limits, w.routes);

{
  "carriers": [
    "blank",
    "focus"
  ],
  "routes": {
    "content": "/writing/content",
    "context": "/writing/context",
    "resolve": "/writing/resolve",
    "windows": "/writing/windows"
  },
  "prepare": false,
  "includesUnsavedCanvas": false,
  "managedLayers": false,
  "windowEnumeration": true,
  "confirmsWritable": false,
  "pencilCommit": {
    "canSwitch": false,
    "carriers": [
      "focus"
    ],
    "inputFrozen": false,
    "operationRecord": "process-local",
    "requiresConfirm": true,
    "result": "/writing/pencil-result",
    "submit": "/writing/pencil-commit"
  },
  "focusTransition": {
    "changesLayer": false,
    "createsAttempt": false,
    "result": "/writing/transition-result",
    "savesCurrentPencil": true,
    "submit": "/writing/focus-enter"
  },
  "ownedBlankEntry": {
    "changesLayer": false,
    "createsAttempt": false,
    "opensOwnedBlank": true,
    "result": "/writing/transition-result",
    "submit": "/writing/blank-enter"
  },
  "stage": "persisted-inspection",
  "practiceSessionRecord": {
    "assess": "/writing/session-assess",
    "blankBegin": "/writing/session-blank-begin",
    "canCreate": true,
    "canSwitch": false,
    "cancel": "/writing/session-cancel",
    "create": "/writing/session-create",
    "finish": "/writing/session-finish",
    "focusBegin": "/writing/session-focus-begin",
    "pause": "/writing/session-pause",
    "preview": "/writing/session-preview",
    "read": "/writing/session-read",
    "ready": false,
    "reconcile": "/writing/session-reconcile",
    "reserve": "/writing/session-reserve",
    "restore": "/writing/session-layer-restore",
    "result": "/writing/transition-result",
    "resume": "/writing/session-resume",
    "storage": "device-local"
  },
  "bridgeApiVersion": "0.91",
  "documentPencilCommit": {
    "canSwitch": false,
    "inputFrozen": false,
    "requiresConfirm": true,
    "result": "/writing/pencil-result",
    "submit": "/writing/pencil-document-commit",
    "targetFrom": "context.surfaces[].state.visiblePages[].continuousCommitTarget|pagedCommitTarget",
    "writers": [
      "continuous",
      "paged"
    ]
  },
  "ownedBlankPreparation": {
    "changesLayer": false,
    "createsAttempt": false,
    "opensAnswerSpace": false,
    "result": "/writing/transition-result",
    "submit": "/writing/blank-prepare"
  },
  "sessionContext": false,
  "resolve": true,
  "flush": false,
  "pencilInputGate": {
    "grantsCallerLease": false,
    "maximumSeconds": 15,
    "programmaticNavigationBlocked": false,
    "scope": "application-ui-only"
  },
  "liveWindowContext": true,
  "contentInventory": true,
  "practiceOnCurrentLayer": {
    "blankEnter": "/writing/session-blank-enter",
    "changesLayer": false,
    "createsAttempt": false,
    "exit": "/writing/session-exit",
    "focusEnter": "/writing/session-focus-enter",
    "restoresOnExit": false,
    "result": "/writing/transition-result",
    "takesLease": false
  },
  "managedLayerTrial": {
    "blankBegin": "/writing/blank-begin",
    "canSwitch": false,
    "compact": "/writing/layer-compact",
    "confirmsPersistedLayer": true,
    "createsAttempt": false,
    "focusBegin": "/writing/focus-begin",
    "leaseStorage": "device-local",
    "read": "/writing/layer-leases",
    "ready": false,
    "restore": "/writing/layer-restore",
    "result": "/writing/transition-result"
  },
  "schemaVersion": 1,
  "snapshot": false,
  "practicePlan": {
    "maxQuestions": 20,
    "read": "/writing/plan-read",
    "save": "/writing/plan-save",
    "startsWriting": false,
    "storage": "device-local"
  },
  "switch": false,
  "limits": {
    "layerIds": 32,
    "parts": 2048,
    "rows": 256
  }
}