> **Back to [Style Guide](../mermaid_style_guide.md)** — Read the style guide first for emoji, color, and accessibility rules. **Syntax keyword:** `packet-beta` **Best for:** Network protocol headers, data structure layouts, binary format documentation, bit-level specifications **When NOT to use:** General data models (use [ER](er.md)), system architecture (use [C4](c4.md) or [Architecture](architecture.md)) > ⚠️ **Accessibility:** Packet diagrams do **not** support `accTitle`/`accDescr`. Alw...
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<!-- Source: https://github.com/SuperiorByteWorks-LLC/agent-project | License: Apache-2.0 | Author: Clayton Young / Superior Byte Works, LLC (Boreal Bytes) -->
# Packet Diagram
> **Back to [Style Guide](../mermaid_style_guide.md)** — Read the style guide first for emoji, color, and accessibility rules.
**Syntax keyword:** `packet-beta`
**Best for:** Network protocol headers, data structure layouts, binary format documentation, bit-level specifications
**When NOT to use:** General data models (use [ER](er.md)), system architecture (use [C4](c4.md) or [Architecture](architecture.md))
> ⚠️ **Accessibility:** Packet diagrams do **not** support `accTitle`/`accDescr`. Always place a descriptive _italic_ Markdown paragraph directly above the code block.
---
## Exemplar Diagram
_Packet diagram showing the structure of a simplified TCP header with field sizes in bits:_
```mermaid
packet-beta
0-15: "Source Port"
16-31: "Destination Port"
32-63: "Sequence Number"
64-95: "Acknowledgment Number"
96-99: "Data Offset"
100-105: "Reserved"
106-111: "Flags (URG,ACK,PSH,RST,SYN,FIN)"
112-127: "Window Size"
128-143: "Checksum"
144-159: "Urgent Pointer"
```
---
## Tips
- Ranges are `start-end:` in bits (0-indexed)
- Keep field labels concise — abbreviate if needed
- Use for any fixed-width binary format, not just network packets
- Row width defaults to 32 bits — fields wrap naturally
- **Always** pair with a Markdown text description above for screen readers
---
## Template
_Description of the protocol or data format and its field structure:_
```mermaid
packet-beta
0-7: "Field A"
8-15: "Field B"
16-31: "Field C"
32-63: "Field D"
```
