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docs/dagpipe/wiki/01_overview/index.html
Vishesh 'ironeagle' Bangotra 7aadae1736 feat: collect dagpipe wiki, refresh lib and mcp artifacts 
Enables dagpipe wiki on the docs hub alongside lib and mcp, removes stale nested lib pages, and picks up regenerated GSDFC docstrings in the MCP bundle.
2026-09-16 15:43:14 +05:30

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<h1 id="library-overview">🗺️ Library Overview</h1>
<p><code>dagpipe</code> is a small execution framework that propagates immutable <code>State</code>
objects through <code>Node</code> units connected in a directed acyclic graph (DAG). It is
designed for deterministic, observable, and resumable data-processing pipelines.</p>
<hr />
<h2 id="architecture">🏗️ Architecture</h2>
<p>At runtime a pipeline is made of four cooperating layers:</p>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-0-10">10</a></span>
<span class="normal"><a href="#__codelineno-0-11">11</a></span>
<span class="normal"><a href="#__codelineno-0-12">12</a></span>
<span class="normal"><a href="#__codelineno-0-13">13</a></span>
<span class="normal"><a href="#__codelineno-0-14">14</a></span>
<span class="normal"><a href="#__codelineno-0-15">15</a></span>
<span class="normal"><a href="#__codelineno-0-16">16</a></span>
<span class="normal"><a href="#__codelineno-0-17">17</a></span>
<span class="normal"><a href="#__codelineno-0-18">18</a></span>
<span class="normal"><a href="#__codelineno-0-19">19</a></span>
<span class="normal"><a href="#__codelineno-0-20">20</a></span>
<span class="normal"><a href="#__codelineno-0-21">21</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a>┌────────────────────────────────────────────────────────────┐
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a>│ YAML (optional) │
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a>│ schema · initial · nodes · graph → load_pipeline() │
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a>└──────────────────────────────┬─────────────────────────────┘
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a> ▼
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a>┌────────────────────────────────────────────────────────────┐
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a>│ Graph (execution topology) │
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a>│ roots · add_edge(child) · children() · parents() │
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a>│ acyclic — validated on every mutation │
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a>└──────────────────────────────┬─────────────────────────────┘
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11"></a> ▼
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a>┌────────────────────────────────────────────────────────────┐
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13"></a>│ Engine (orchestration) │
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14"></a>│ run / run_async / run_steps / run_steps_async │
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a>│ mode: linear sequence OR graph BFS │
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16"></a>└──────────────────────────────┬─────────────────────────────┘
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17"></a> ▼
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18"></a>┌────────────────────────────────────────────────────────────┐
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19"></a>│ State · Payload · Schema (data plane) │
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20"></a>│ immutable State · fork() · dot-path payload · validation │
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21"></a>└────────────────────────────────────────────────────────────┘
</span></code></pre></div></td></tr></table></div>
<ul>
<li><strong><code>Node</code></strong> — a pure unit of work. Each node consumes one <code>State</code> and yields
zero, one, or many derived <code>State</code> objects.</li>
<li><strong><code>Graph</code></strong> — the execution topology. It only stores connectivity; it never
executes anything.</li>
<li><strong><code>Engine</code></strong> — the orchestrator. It accepts either a linear <code>Sequence[Node]</code>
or a <code>Graph</code> and produces terminal states.</li>
<li><strong><code>State</code> / <code>Payload</code> / <code>Schema</code></strong> — the immutable data plane. Nodes read a
<code>State</code>, fork new ones, and let the <code>Schema</code> guarantee shape.</li>
</ul>
<hr />
<h2 id="lifecycle-of-a-run">🔄 Lifecycle of a run</h2>
<table>
<thead>
<tr>
<th>Step</th>
<th>Who</th>
<th>What happens</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>You</td>
<td>Define <code>Node</code> subclasses and a <code>State</code> subclass bound to a <code>Schema</code>.</td>
</tr>
<tr>
<td>2</td>
<td>You</td>
<td>Build a <code>Graph</code> (order + <code>add_edge</code>) or a linear <code>Sequence[Node]</code>.</td>
</tr>
<tr>
<td>3</td>
<td>You</td>
<td>Construct <code>Engine(nodes_or_graph)</code>.</td>
</tr>
<tr>
<td>4</td>
<td>You</td>
<td>Create a root <code>State</code> (<code>MyState(payload=Payload(...))</code>) — validated here.</td>
</tr>
<tr>
<td>5</td>
<td>Engine</td>
<td>Executes roots first, then fans <code>State</code> out along edges (graph mode) or feeds each sequence element (linear mode).</td>
</tr>
<tr>
<td>6</td>
<td>Engine</td>
<td>Collects <strong>terminal states</strong> — states from nodes with no children (or the last step in linear mode).</td>
</tr>
</tbody>
</table>
<p>Nodes that yield no states prune the branch — see
<a href="../03_use_cases/02_graph_execution/">use case 02</a>.</p>
<hr />
<h2 id="which-execution-model-should-you-use">⚖️ Which execution model should you use?</h2>
<table>
<thead>
<tr>
<th>Model</th>
<th>Construct</th>
<th>Use when</th>
<th>Runs</th>
</tr>
</thead>
<tbody>
<tr>
<td>Linear</td>
<td><code>Engine([a, b, c])</code></td>
<td>A fixed pipeline of steps, no branches</td>
<td><code>run</code></td>
</tr>
<tr>
<td>Graph</td>
<td><code>Engine(Graph)</code></td>
<td>Branching, merging, multiple roots</td>
<td><code>run</code></td>
</tr>
<tr>
<td>Async</td>
<td><code>Engine</code> + <code>AsyncNode</code> subclasses</td>
<td>I/O-bound steps (HTTP, DB, files)</td>
<td><code>run_async</code></td>
</tr>
<tr>
<td>Steps</td>
<td><code>Engine.run_steps(...)</code></td>
<td>Progress bars, resume-after-interrupt</td>
<td><code>run_steps</code></td>
</tr>
</tbody>
</table>
<blockquote>
<p>A linear sequence is equivalent to a chain graph: each step receives every
state its predecessor produced. Graph mode gives you explicit fan-out and
fan-in.</p>
</blockquote>
<hr />
<h2 id="read-next">📚 Read Next</h2>
<ul>
<li><a href="../02_components/">Core Components</a> — the validated public API surface.</li>
<li><a href="../03_use_cases/01_basic_linear_pipeline/">Use case 01</a> — the minimal pipeline.</li>
<li><a href="../03_use_cases/02_graph_execution/">Use case 02</a> — branching and merging.</li>
<li><a href="../04_best_practices/">Best Practices</a> — team-wide conventions.</li>
</ul>
</article>
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