packetdiag

packetdiag diagram (uml-mcp)

diagram_type: packetdiag
Backend: packetdiag
Output formats: png, svg, pdf

Network packet layout diagrams

Load the workflow skill uml-mcp-diagrams for URL-first replies, progressive discovery, and which MCP tool to call. This file is notation only; it does not add an MCP tool.

Styling

• Field lengths drive the layout; label every span.
• No MCP theme — use short field names for contrast.

Starter template

packetdiag {
  0-15: Source Port;
  16-31: Destination Port;
  32-63: Sequence Number;
  64-95: Acknowledgment Number;
}

Example

packetdiag {
  colwidth = 32;
  node_height = 72;
  0-15: Source Port;
  16-31: Destination Port;
  32-63: Sequence Number;
  64-95: Acknowledgment Number;
  96-99: Data Offset;
  100-105: Reserved;
  106: URG [rotate = 270];
  107: ACK [rotate = 270];
  108: PSH [rotate = 270];
  109: RST [rotate = 270];
  110: SYN [rotate = 270];
  111: FIN [rotate = 270];
  112-127: Window;
  128-143: Checksum;
  144-159: Urgent Pointer;
  160-191: (Options and Padding);
  192-223: data [colheight = 3];
}

Render with uml-mcp

1. Set diagram_type to packetdiag exactly.
2. Call validate_uml when the source is untrusted (prefer strict: true for Mermaid sequence).
3. Call generate_uml, generate_uml_image (chat PNG), or generate_uml_batch.
4. Pass theme when this skill's Themes section lists supported values.
5. Surface the returned url / playground (see the workflow skill).

Confirm formats with uml://formats or list_diagram_types when unsure.