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	<meta charset="utf-8" /><meta name="hf:doc:metadata" content="{"title":"Building Blocks of LangGraph","local":"building-blocks-of-langgraph","sections":[{"title":"1. State","local":"1-state","sections":[],"depth":2},{"title":"2. Nodes","local":"2-nodes","sections":[],"depth":2},{"title":"3. Edges","local":"3-edges","sections":[],"depth":2},{"title":"4. StateGraph","local":"4-stategraph","sections":[],"depth":2},{"title":"What’s Next?","local":"whats-next","sections":[],"depth":2}],"depth":1}">
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	<link rel="modulepreload" href="/docs/agents-course/pr_545/en/_app/immutable/chunks/getInferenceSnippets.031140c2.js"><!-- HEAD_svelte-u9bgzb_START --><meta name="hf:doc:metadata" content="{"title":"Building Blocks of LangGraph","local":"building-blocks-of-langgraph","sections":[{"title":"1. State","local":"1-state","sections":[],"depth":2},{"title":"2. Nodes","local":"2-nodes","sections":[],"depth":2},{"title":"3. Edges","local":"3-edges","sections":[],"depth":2},{"title":"4. StateGraph","local":"4-stategraph","sections":[],"depth":2},{"title":"What’s Next?","local":"whats-next","sections":[],"depth":2}],"depth":1}"><!-- HEAD_svelte-u9bgzb_END --> <p></p> <h1 class="relative group"><a id="building-blocks-of-langgraph" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#building-blocks-of-langgraph"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>Building Blocks of LangGraph</span></h1> <p data-svelte-h="svelte-s50h74">To build applications with LangGraph, you need to understand its core components. Let’s explore the fundamental building blocks that make up a LangGraph application.</p> <img src="https://huggingface.co/datasets/agents-course/course-images/resolve/main/en/unit2/LangGraph/Building_blocks.png" alt="Building Blocks" width="70%"> <p data-svelte-h="svelte-1n29p4d">An application in LangGraph starts from an <strong>entrypoint</strong>, and depending on the execution, the flow may go to one function or another until it reaches the END.</p> <img src="https://huggingface.co/datasets/agents-course/course-images/resolve/main/en/unit2/LangGraph/application.png" alt="Application"> <h2 class="relative group"><a id="1-state" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#1-state"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>1. State</span></h2> <p data-svelte-h="svelte-13mfgi9"><strong>State</strong> is the central concept in LangGraph. It represents all the information that flows through your application.</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START --><span class="hljs-keyword">from</span> typing_extensions <span class="hljs-keyword">import</span> TypedDict

	<span class="hljs-keyword">class</span> <span class="hljs-title class_">State</span>(<span class="hljs-title class_ inherited__">TypedDict</span>):
	graph_state: <span class="hljs-built_in">str</span><!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-1nv9oba">The state is <strong>User defined</strong>, hence the fields should carefully be crafted to contain all data needed for decision-making process!</p> <blockquote data-svelte-h="svelte-7zvkss"><p>💡 <strong>Tip:</strong> Think carefully about what information your application needs to track between steps.</p></blockquote> <h2 class="relative group"><a id="2-nodes" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#2-nodes"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>2. Nodes</span></h2> <p data-svelte-h="svelte-bl6xu8"><strong>Nodes</strong> are python functions. Each node:</p> <ul data-svelte-h="svelte-1ojc0n6"><li>Takes the state as input</li> <li>Performs some operation</li> <li>Returns updates to the state</li></ul> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START --><span class="hljs-keyword">def</span> <span class="hljs-title function_">node_1</span>(<span class="hljs-params">state</span>):
	<span class="hljs-built_in">print</span>(<span class="hljs-string">"---Node 1---"</span>)
	<span class="hljs-keyword">return</span> {<span class="hljs-string">"graph_state"</span>: state[<span class="hljs-string">'graph_state'</span>] +<span class="hljs-string">" I am"</span>}

	<span class="hljs-keyword">def</span> <span class="hljs-title function_">node_2</span>(<span class="hljs-params">state</span>):
	<span class="hljs-built_in">print</span>(<span class="hljs-string">"---Node 2---"</span>)
	<span class="hljs-keyword">return</span> {<span class="hljs-string">"graph_state"</span>: state[<span class="hljs-string">'graph_state'</span>] +<span class="hljs-string">" happy!"</span>}

	<span class="hljs-keyword">def</span> <span class="hljs-title function_">node_3</span>(<span class="hljs-params">state</span>):
	<span class="hljs-built_in">print</span>(<span class="hljs-string">"---Node 3---"</span>)
	<span class="hljs-keyword">return</span> {<span class="hljs-string">"graph_state"</span>: state[<span class="hljs-string">'graph_state'</span>] +<span class="hljs-string">" sad!"</span>}<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-16qrzia">For example, Nodes can contain:</p> <ul data-svelte-h="svelte-opt97h"><li><strong>LLM calls</strong>: Generate text or make decisions</li> <li><strong>Tool calls</strong>: Interact with external systems</li> <li><strong>Conditional logic</strong>: Determine next steps</li> <li><strong>Human intervention</strong>: Get input from users</li></ul> <blockquote data-svelte-h="svelte-15fspvc"><p>💡 <strong>Info:</strong> Some nodes necessary for the whole workflow like START and END exist from langGraph directly.</p></blockquote> <h2 class="relative group"><a id="3-edges" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#3-edges"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>3. Edges</span></h2> <p data-svelte-h="svelte-1da8kr2"><strong>Edges</strong> connect nodes and define the possible paths through your graph:</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START --><span class="hljs-keyword">import</span> random
	<span class="hljs-keyword">from</span> typing <span class="hljs-keyword">import</span> <span class="hljs-type">Literal</span>

	<span class="hljs-keyword">def</span> <span class="hljs-title function_">decide_mood</span>(<span class="hljs-params">state</span>) -> <span class="hljs-type">Literal</span>[<span class="hljs-string">"node_2"</span>, <span class="hljs-string">"node_3"</span>]:

	<span class="hljs-comment"># Often, we will use state to decide on the next node to visit</span>
	user_input = state[<span class="hljs-string">'graph_state'</span>]

	<span class="hljs-comment"># Here, let's just do a 50 / 50 split between nodes 2, 3</span>
	<span class="hljs-keyword">if</span> random.random() < <span class="hljs-number">0.5</span>:

	<span class="hljs-comment"># 50% of the time, we return Node 2</span>
	<span class="hljs-keyword">return</span> <span class="hljs-string">"node_2"</span>

	<span class="hljs-comment"># 50% of the time, we return Node 3</span>
	<span class="hljs-keyword">return</span> <span class="hljs-string">"node_3"</span><!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-edfl2t">Edges can be:</p> <ul data-svelte-h="svelte-1q9eq0"><li><strong>Direct</strong>: Always go from node A to node B</li> <li><strong>Conditional</strong>: Choose the next node based on the current state</li></ul> <h2 class="relative group"><a id="4-stategraph" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#4-stategraph"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>4. StateGraph</span></h2> <p data-svelte-h="svelte-g73ioo">The <strong>StateGraph</strong> is the container that holds your entire agent workflow:</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START --><span class="hljs-keyword">from</span> IPython.display <span class="hljs-keyword">import</span> Image, display
	<span class="hljs-keyword">from</span> langgraph.graph <span class="hljs-keyword">import</span> StateGraph, START, END

	<span class="hljs-comment"># Build graph</span>
	builder = StateGraph(State)
	builder.add_node(<span class="hljs-string">"node_1"</span>, node_1)
	builder.add_node(<span class="hljs-string">"node_2"</span>, node_2)
	builder.add_node(<span class="hljs-string">"node_3"</span>, node_3)

	<span class="hljs-comment"># Logic</span>
	builder.add_edge(START, <span class="hljs-string">"node_1"</span>)
	builder.add_conditional_edges(<span class="hljs-string">"node_1"</span>, decide_mood)
	builder.add_edge(<span class="hljs-string">"node_2"</span>, END)
	builder.add_edge(<span class="hljs-string">"node_3"</span>, END)

	<span class="hljs-comment"># Add</span>
	graph = builder.<span class="hljs-built_in">compile</span>()<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-147pt7a">Which can then be visualized!</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START --><span class="hljs-comment"># View</span>
	display(Image(graph.get_graph().draw_mermaid_png()))<!-- HTML_TAG_END --></pre></div> <img src="https://huggingface.co/datasets/agents-course/course-images/resolve/main/en/unit2/LangGraph/basic_graph.jpeg" alt="Graph Visualization"> <p data-svelte-h="svelte-12bcwpz">But most importantly, invoked:</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START -->graph.invoke({<span class="hljs-string">"graph_state"</span> : <span class="hljs-string">"Hi, this is Lance."</span>})<!-- HTML_TAG_END --></pre></div> <p data-svelte-h="svelte-1wdnc59">output :</p> <div class="code-block relative "><div class="absolute top-2.5 right-4"><button class="inline-flex items-center relative text-sm focus:text-green-500 cursor-pointer focus:outline-none transition duration-200 ease-in-out opacity-0 mx-0.5 text-gray-600 " title="code excerpt" type="button"><svg class="" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" fill="currentColor" focusable="false" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 32 32"><path d="M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z" transform="translate(0)"></path><path d="M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z" transform="translate(0)"></path><rect fill="none" width="32" height="32"></rect></svg> <div class="absolute pointer-events-none transition-opacity bg-black text-white py-1 px-2 leading-tight rounded font-normal shadow left-1/2 top-full transform -translate-x-1/2 translate-y-2 opacity-0"><div class="absolute bottom-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-black border-4 border-t-0" style="border-left-color: transparent; border-right-color: transparent; "></div> Copied</div></button></div> <pre class=""><!-- HTML_TAG_START -->---<span class="hljs-keyword">Node</span> <span class="hljs-title">1---</span>
	---<span class="hljs-keyword">Node</span> <span class="hljs-title">3---</span>
	{'graph_state': 'Hi, this is Lance. I am sad!'}<!-- HTML_TAG_END --></pre></div> <h2 class="relative group"><a id="whats-next" class="header-link block pr-1.5 text-lg no-hover:hidden with-hover:absolute with-hover:p-1.5 with-hover:opacity-0 with-hover:group-hover:opacity-100 with-hover:right-full" href="#whats-next"><span><svg class="" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" width="1em" height="1em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path d="M167.594 88.393a8.001 8.001 0 0 1 0 11.314l-67.882 67.882a8 8 0 1 1-11.314-11.315l67.882-67.881a8.003 8.003 0 0 1 11.314 0zm-28.287 84.86l-28.284 28.284a40 40 0 0 1-56.567-56.567l28.284-28.284a8 8 0 0 0-11.315-11.315l-28.284 28.284a56 56 0 0 0 79.196 79.197l28.285-28.285a8 8 0 1 0-11.315-11.314zM212.852 43.14a56.002 56.002 0 0 0-79.196 0l-28.284 28.284a8 8 0 1 0 11.314 11.314l28.284-28.284a40 40 0 0 1 56.568 56.567l-28.285 28.285a8 8 0 0 0 11.315 11.314l28.284-28.284a56.065 56.065 0 0 0 0-79.196z" fill="currentColor"></path></svg></span></a> <span>What’s Next?</span></h2> <p data-svelte-h="svelte-p74a0p">In the next section, we’ll put these concepts into practice by building our first graph. This graph lets Alfred take in your e-mails, classify them, and craft a preliminary answer if they are genuine.</p> <a class="!text-gray-400 !no-underline text-sm flex items-center not-prose mt-4" href="https://github.com/huggingface/agents-course/blob/main/units/en/unit2/langgraph/building_blocks.mdx" target="_blank"><span data-svelte-h="svelte-1kd6by1"><</span> <span data-svelte-h="svelte-x0xyl0">></span> <span data-svelte-h="svelte-1dajgef"><span class="underline ml-1.5">Update</span> on GitHub</span></a> <p></p>

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