Sequence

Skill shuakami/paperchart/skills/sequence

Quiet, editorial chart PNGs for technical blog posts. 15 primitives, six themes, one CLI.

Install

npx -y skills add shuakami/paperchart --skill sequence

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What its author says it does

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Render a sequence diagram (Mermaid `sequenceDiagram` equivalent). Actor boxes along the top, dashed lifelines descending, messages drawn as horizontal arrows in time order. Supports notes spanning one or more actors, reply arrows (dashed + open head), async arrows (open head, solid line), self-calls (right-hand loop), and an accent color for a single emphasized message.

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SKILL.md

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paperchart — sequence

Classic request-flow sequence diagram. Actors across the top, time flowing downward. Good for HTTP request flows, RPC traces, event interchanges.

When to use

API request / response flows across services.
RPC traces with returns.
Explaining ordering guarantees between concurrent actors.

Input shape

{
  "data": {
    "actors": [
      { "id": "client",  "label": "browser",  "caption": "web app" },
      { "id": "edge",    "label": "edge",     "caption": "CDN + runtime" },
      { "id": "origin",  "label": "origin",   "caption": "API server" }
    ],
    "steps": [
      { "kind": "msg",  "from": "client", "to": "edge",   "label": "GET /api/search" },
      { "kind": "note", "over": "edge",   "text": "parse and normalize query" },
      { "kind": "msg",  "from": "edge",   "to": "origin", "label": "lookup(q)", "accent": true },
      { "kind": "msg",  "from": "origin", "to": "edge",   "label": "18 hits", "reply": true },
      { "kind": "msg",  "from": "edge",   "to": "client", "label": "200 OK",  "reply": true }
    ]
  }
}

Step kinds

{ "kind": "msg", "from", "to", "label?", "reply?", "async?", "accent?" } — horizontal arrow. reply: true draws a dashed line with open arrowhead; async: true draws a solid line with open arrowhead; accent: true uses the theme accent color.
{ "kind": "note", "over": "actorId" | [idA, idB], "text": "..." } — a note box over one actor, or spanning two.

Self-calls

from === to draws a short loop to the right of the actor's lifeline, useful for "validate" / "score" / "retry internally" steps.

CLI

paperchart sequence -i data.json -o seq.png
paperchart sequence --defaults -o seq.png