For AI agents: the complete documentation index is available at https://lazygophers.github.io/pamphlet/en/llms.txt, the full documentation bundle is available at https://lazygophers.github.io/pamphlet/en/llms-full.txt, and this page is available as Markdown at https://lazygophers.github.io/pamphlet/en/write/diagrams/sequence.md.
Pamphlet
  • English

      • Sequence diagrams

      What it is

      Several participants passing messages back and forth in time order.

      When to use it

      Call order across services, a handshake, anywhere "who goes first" is unclear.

      How to write it

      Pamphlet's own syntax — declarations first, relationships second; all seventeen kinds share this skeleton:

      :::sequence[One compile]
participants:
  author = "Author"
  compiler = "Compiler"
messages:
  author -> compiler : pamphlet build plan.md
  compiler --> author : plan.html
:::

      This syntax does not render on GitHub. If you need it to, write the same diagram as a Mermaid fence instead.

      What comes out

      Drawn to SVG at compile time and inlined into the output, so the reader downloads no drawing library and makes no network request. Colours follow the theme; scroll to zoom, drag to pan, double-click to reset.

      Traps

      • The block names are fixed: participants: and messages:
      • -> is a solid request, --> a dashed reply — they mean different things
      • The message text goes after the colon: author -> compiler : build
      • A participant used in a message but never declared reports DIAG-306