mcpixels.app WebMCP Tools, Schemas & Agent Capabilities

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mcpixels.app

live Unverified (seed import) Media & Personal 6 tools imperative implementation

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A pixel canvas that people and AI agents can edit together through WebMCP.

First seen 2026-09-07 · Last seen 2026-09-14 · Source: webmcp.com

Answer 1 · Act 5 · Transact 0 · Score: Not yet scored

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draw_pixel_art

act imperative

Draw editable pixel art on the live canvas; x and y run -512..511, y downward. rows place one-character palette entries from origin; "." keeps a cell and "-" erases it. Set format:"rle" to send those rows as runs instead ("12k8r." is twelve k, eight r, one dot), which fits a whole large scene in one call. ops are ";"-separated: c COLOR; px x y...; line x0 y0 x1 y1; rect/ellipse x0 y0 x1 y1 [f]; poly x0 y0 x1 y1 x2 y2... [f]; path x0 y0 x1 y1...; fill x0 y0 x1 y1 checker|dither A B [n]; bucket x y; recolor from to x0 y0 x1 y1. COLOR is a palette key, hex, or "-"; f fills. poly closes back to its first point and path does not, so poly ... f is any filled polygon — a roof, a mountain, a fin. fill writes a two-color pattern over a whole rectangle: checker takes a square size, dither an ordered-dither percent of B. Ops use absolute coordinates. Rows run first and later writes win. Off-canvas clips. One call is one undo step; invalid input changes nothing.

Input schema

Property	Type	Required	Description
`origin`	array	no	Canvas position of the top-left cell of rows.
`palette`	object	no	Character to color, e.g. {"k":"#161616","r":"#ff5c35"}. Up to 64 entries. "." and "-" are reserved.
`rows`	array	no	Picture rows, top to bottom. As "chars": at most 256 rows of 256 characters and 32768 cells per call, counted as widest row x row count — so 256x256 is over the limit. As "rle": at most 1024 rows of 1024 characters decoding to 262144 cells, which covers a 512x512 picture in one call.
`format`	string	no	How rows are encoded. Default "chars", one character per cell; "rle" reads them as runs, as above. Digits are run counts in "rle", so no palette key may be a digit there.
`ops`	string	no	Command string, up to 128 ops and 4000 characters. px takes up to 500 x y pairs, poly and path up to 64 points; one shape or fill covers up to 50000 pixels. Ops are not counted against the rows cell limit, so large flat geometry is cheapest here.
`mirror`	string	no	Also mirror everything this call draws across the canvas center.
`dryRun`	boolean	no	Validate and price the call without drawing: same counts, bounds, warnings and hint, no pixels changed and no undo step. Worth one call before a big or expensive draw.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "origin": {
      "type": "array",
      "items": {
        "type": "integer",
        "minimum": -512,
        "maximum": 511
      },
      "minItems": 2,
      "maxItems": 2,
      "description": "Canvas position of the top-left cell of rows."
    },
    "palette": {
      "type": "object",
      "description": "Character to color, e.g. {\"k\":\"#161616\",\"r\":\"#ff5c35\"}. Up to 64 entries. \".\" and \"-\" are reserved.",
      "additionalProperties": {
        "type": "string",
        "pattern": "^#([0-9A-Fa-f]{3}|[0-9A-Fa-f]{6})$"
      }
    },
    "rows": {
      "type": "array",
      "description": "Picture rows, top to bottom. As \"chars\": at most 256 rows of 256 characters and 32768 cells per call, counted as widest row x row count — so 256x256 is over the limit. As \"rle\": at most 1024 rows of 1024 characters decoding to 262144 cells, which covers a 512x512 picture in one call.",
      "items": {
        "type": "string",
        "maxLength": 1024
      },
      "maxItems": 1024
    },
    "format": {
      "type": "string",
      "enum": [
        "chars",
        "rle"
      ],
      "description": "How rows are encoded. Default \"chars\", one character per cell; \"rle\" reads them as runs, as above. Digits are run counts in \"rle\", so no palette key may be a digit there."
    },
    "ops": {
      "type": "string",
      "description": "Command string, up to 128 ops and 4000 characters. px takes up to 500 x y pairs, poly and path up to 64 points; one shape or fill covers up to 50000 pixels. Ops are not counted against the rows cell limit, so large flat geometry is cheapest here.",
      "maxLength": 4000
    },
    "mirror": {
      "type": "string",
      "enum": [
        "left-right",
        "top-bottom",
        "both"
      ],
      "description": "Also mirror everything this call draws across the canvas center."
    },
    "dryRun": {
      "type": "boolean",
      "description": "Validate and price the call without drawing: same counts, bounds, warnings and hint, no pixels changed and no undo step. Worth one call before a big or expensive draw."
    }
  },
  "additionalProperties": false
}

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