postext.dev WebMCP Tools, Schemas & Agent Capabilities

postext.dev

live Unverified (seed import) Developer Tools 61 tools imperative implementation

Try the Postext typesetting engine live: edit markdown, manage figures and tables, tune Knuth-Plass justification, and export print-ready PDF and EPUB — in the browser.

First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com

Answer 8 · Act 48 · Transact 5 · Score: Not yet scored

Tool inspector

sandbox_save_font

transact imperative May require confirmation

The book's own fonts, as the Fonts panel keeps them. add: upload a font file (WOFF2, WOFF, TTF or OTF, by url or base64) as one face — a weight and a style — of a custom family; a face of that weight and style already there is replaced, and the answer says so. update_face: give a face another weight or style. rename_family: give a family another name; the fontFamily settings that name the old one are listed, not changed. remove: take away a family, or its faces of a weight, a style or a file name. remove_all: take away every custom font. A removed face's file is deleted and cannot be brought back. A family's name is used like any other in a fontFamily setting, and travels with the book in its .postext file.

Page: /en/sandbox

Input schema

Property	Type	Required	Description
`action`	string	yes	—
`family`	string	no	The family name (every action but remove_all).
`weight`	integer	no	add: the face's weight (default 400). update_face, remove: the faces of this weight.
`style`	string	no	add: the face's style (default normal). update_face, remove: the faces of this style.
`fileName`	string	no	update_face, remove: the face uploaded under this file name, as sandbox_list_fonts gives it.
`file`	object	no	A file: where to fetch it (url) or its bytes (base64).
`newFamily`	string	no	rename_family: the family's new name.
`newWeight`	integer	no	update_face: the weight the face is declared at.
`newStyle`	string	no	update_face: the style the face is declared as.
`wait`	boolean	no	Wait for the book to be laid out again (default true).

Raw JSON schema

{
  "type": "object",
  "properties": {
    "action": {
      "type": "string",
      "enum": [
        "add",
        "update_face",
        "rename_family",
        "remove",
        "remove_all"
      ]
    },
    "family": {
      "type": "string",
      "description": "The family name (every action but remove_all)."
    },
    "weight": {
      "type": "integer",
      "minimum": 1,
      "maximum": 1000,
      "description": "add: the face's weight (default 400). update_face, remove: the faces of this weight."
    },
    "style": {
      "type": "string",
      "enum": [
        "normal",
        "italic"
      ],
      "description": "add: the face's style (default normal). update_face, remove: the faces of this style."
    },
    "fileName": {
      "type": "string",
      "description": "update_face, remove: the face uploaded under this file name, as sandbox_list_fonts gives it."
    },
    "file": {
      "type": "object",
      "description": "A file: where to fetch it (url) or its bytes (base64).",
      "properties": {
        "url": {
          "type": "string",
          "description": "An http(s) or data: URL the page can fetch."
        },
        "base64": {
          "type": "string",
          "description": "The bytes, base64-encoded."
        },
        "mimeType": {
          "type": "string",
          "description": "Its media type, e.g. image/png. Read from the response or the file name when left out."
        },
        "fileName": {
          "type": "string",
          "description": "Its file name, with its extension."
        }
      },
      "additionalProperties": false
    },
    "newFamily": {
      "type": "string",
      "description": "rename_family: the family's new name."
    },
    "newWeight": {
      "type": "integer",
      "minimum": 1,
      "maximum": 1000,
      "description": "update_face: the weight the face is declared at."
    },
    "newStyle": {
      "type": "string",
      "enum": [
        "normal",
        "italic"
      ],
      "description": "update_face: the style the face is declared as."
    },
    "wait": {
      "type": "boolean",
      "description": "Wait for the book to be laid out again (default true)."
    }
  },
  "required": [
    "action"
  ],
  "additionalProperties": false
}

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