{"id":2212,"date":"2026-04-09T07:59:18","date_gmt":"2026-04-09T05:59:18","guid":{"rendered":"https:\/\/askem.eu\/?p=2212"},"modified":"2026-04-09T07:59:24","modified_gmt":"2026-04-09T05:59:24","slug":"langgraph-construire-des-agents-ia-autonomes-avec-orchestration-memoire-et-outils","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/04\/09\/langgraph-construire-des-agents-ia-autonomes-avec-orchestration-memoire-et-outils\/","title":{"rendered":"LangGraph : construire des agents IA autonomes avec orchestration, m\u00e9moire et outils"},"content":{"rendered":"<h2 class=\"wp-block-heading\">LangGraph&nbsp;: construire des agents IA autonomes avec orchestration, m\u00e9moire et outils<\/h2>\n\n\n\n<p>Les LLM savent g\u00e9n\u00e9rer du texte. Mais un agent IA, c&rsquo;est autre chose&nbsp;: c&rsquo;est un programme qui raisonne, d\u00e9cide, utilise des outils, revient en arri\u00e8re si n\u00e9cessaire, et maintient un \u00e9tat entre les \u00e9tapes. <strong>LangGraph<\/strong>, biblioth\u00e8que open source de l&rsquo;\u00e9cosyst\u00e8me LangChain, permet de construire exactement cela&nbsp;: des agents \u00e0 base de graphes d&rsquo;\u00e9tats, avec cycles, branchements conditionnels et m\u00e9moire persistante.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pourquoi LangGraph plut\u00f4t qu&rsquo;une cha\u00eene lin\u00e9aire<\/h3>\n\n\n\n<p>Un pipeline RAG classique est s\u00e9quentiel&nbsp;: requ\u00eate \u2192 retrieval \u2192 g\u00e9n\u00e9ration \u2192 r\u00e9ponse. Mais un agent doit pouvoir boucler, prendre des d\u00e9cisions, appeler un outil puis d\u00e9cider d&rsquo;en appeler un autre en fonction du r\u00e9sultat. LangGraph mod\u00e9lise ce comportement sous forme de <strong>graphe orient\u00e9 avec \u00e9tat<\/strong> (StateGraph) o\u00f9 chaque n\u0153ud est une fonction Python et chaque ar\u00eate peut \u00eatre conditionnelle. Le graphe tourne en boucle tant que l&rsquo;agent n&rsquo;a pas atteint un n\u0153ud terminal, exactement comme un humain qui it\u00e8re sur un probl\u00e8me.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Les concepts fondamentaux<\/h3>\n\n\n\n<p>LangGraph repose sur quatre briques principales&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>State&nbsp;:<\/strong> un objet typ\u00e9 (TypedDict ou Pydantic) qui porte l&rsquo;\u00e9tat complet de l&rsquo;agent \u2014 messages, r\u00e9sultats interm\u00e9diaires, compteurs de boucle, flags de d\u00e9cision.<\/li>\n\n\n\n<li><strong>Nodes&nbsp;:<\/strong> des fonctions Python qui re\u00e7oivent l&rsquo;\u00e9tat, ex\u00e9cutent une action (appel LLM, requ\u00eate API, transformation de donn\u00e9es) et retournent un \u00e9tat mis \u00e0 jour.<\/li>\n\n\n\n<li><strong>Edges&nbsp;:<\/strong> les transitions entre n\u0153uds, qui peuvent \u00eatre inconditionnelles ou conditionnelles (une fonction Python d\u00e9cide du prochain n\u0153ud en fonction de l&rsquo;\u00e9tat).<\/li>\n\n\n\n<li><strong>Checkpointer&nbsp;:<\/strong> un m\u00e9canisme de persistance (SQLite, PostgreSQL) qui sauvegarde l&rsquo;\u00e9tat \u00e0 chaque \u00e9tape, permettant reprise apr\u00e8s erreur, historique de conversation, et human-in-the-loop.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Exemple minimal&nbsp;: un agent qui utilise des outils<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>from langgraph.graph import StateGraph, MessagesState, START, END\nfrom langgraph.prebuilt import ToolNode, tools_condition\nfrom langchain_community.llms import Ollama\nfrom langchain_core.tools import tool\n\n@tool\ndef rechercher_ckan(query: str) -&gt; str:\n    \"\"\"Recherche un jeu de donn\u00e9es sur le portail CKAN.\"\"\"\n    # Appel API CKAN ici\n    return f\"3 jeux de donn\u00e9es trouv\u00e9s pour '{query}'\"\n\n@tool\ndef analyser_csv(url: str) -&gt; str:\n    \"\"\"T\u00e9l\u00e9charge et analyse un fichier CSV.\"\"\"\n    # DuckDB ou pandas ici\n    return \"Le fichier contient 12 colonnes et 45 000 lignes\"\n\n# D\u00e9finir le mod\u00e8le (Ollama local)\nllm = Ollama(model=\"mistral\").bind_tools(&#91;rechercher_ckan, analyser_csv])\n\n# Construire le graphe\ngraph = StateGraph(MessagesState)\ngraph.add_node(\"agent\", lambda state: {\"messages\": &#91;llm.invoke(state&#91;\"messages\"])]})\ngraph.add_node(\"tools\", ToolNode(&#91;rechercher_ckan, analyser_csv]))\n\ngraph.add_edge(START, \"agent\")\ngraph.add_conditional_edges(\"agent\", tools_condition)\ngraph.add_edge(\"tools\", \"agent\")\n\napp = graph.compile()\n\n# Lancer l'agent\nresult = app.invoke({\n    \"messages\": &#91;(\"user\", \"Trouve les donn\u00e9es transport de Rennes et analyse le premier CSV\")]\n})<\/code><\/pre>\n\n\n\n<p>Dans cet exemple, l&rsquo;agent commence par appeler le LLM. Si le LLM d\u00e9cide d&rsquo;utiliser un outil (recherche CKAN, analyse CSV), le graphe route vers le n\u0153ud <code>tools<\/code>, puis revient au n\u0153ud <code>agent<\/code> avec le r\u00e9sultat. Le cycle continue jusqu&rsquo;\u00e0 ce que le LLM produise une r\u00e9ponse finale sans appel d&rsquo;outil.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00e9moire persistante et human-in-the-loop<\/h3>\n\n\n\n<p>En ajoutant un <strong>checkpointer<\/strong>, chaque ex\u00e9cution du graphe est sauvegard\u00e9e \u00e9tape par \u00e9tape. Cela ouvre deux capacit\u00e9s essentielles en production&nbsp;: la reprise apr\u00e8s erreur (l&rsquo;agent reprend exactement l\u00e0 o\u00f9 il s&rsquo;est arr\u00eat\u00e9) et le <strong>human-in-the-loop<\/strong>&nbsp;: on peut interrompre le graphe avant un n\u0153ud critique (par exemple avant d&rsquo;\u00e9crire dans une base de donn\u00e9es), demander validation \u00e0 un humain, puis reprendre l&rsquo;ex\u00e9cution.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langgraph.checkpoint.sqlite import SqliteSaver\n\nmemory = SqliteSaver.from_conn_string(\":memory:\")\napp = graph.compile(checkpointer=memory, interrupt_before=&#91;\"tools\"])\n\n# Premier appel \u2014 s'arr\u00eate avant l'ex\u00e9cution de l'outil\nconfig = {\"configurable\": {\"thread_id\": \"session-42\"}}\nresult = app.invoke({\"messages\": &#91;(\"user\", \"Supprime les doublons du dataset\")]}, config)\n\n# Validation humaine, puis reprise\napp.invoke(None, config)  # continue l'ex\u00e9cution<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Agents multi-acteurs et sous-graphes<\/h3>\n\n\n\n<p>LangGraph permet de composer des agents complexes \u00e0 partir de sous-graphes. Un superviseur peut d\u00e9l\u00e9guer des t\u00e2ches \u00e0 des agents sp\u00e9cialis\u00e9s&nbsp;: un agent  \u00ab&nbsp;recherche open data&nbsp;\u00bb, un agent  \u00ab&nbsp;analyse qualit\u00e9&nbsp;\u00bb, un agent  \u00ab&nbsp;r\u00e9daction de fiche m\u00e9tadonn\u00e9e&nbsp;\u00bb,  chacun avec son propre graphe d&rsquo;\u00e9tats. Le superviseur orchestre les \u00e9changes via un \u00e9tat partag\u00e9. C&rsquo;est le pattern <strong>supervisor-worker<\/strong> qui se rapproche d&rsquo;un v\u00e9ritable control plane pour agents.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Int\u00e9gration dans une stack auto-h\u00e9berg\u00e9e<\/h3>\n\n\n\n<p>LangGraph s&rsquo;int\u00e8gre naturellement avec les briques d\u00e9j\u00e0 couvertes sur askem.eu&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/03\/29\/ollama-executer-des-llm-en-local\/\" type=\"post\" id=\"2141\">Ollama<\/a> \/ <a href=\"https:\/\/askem.eu\/en\/2026\/04\/07\/vllm-servir-des-llm-a-haute-performance-en-production\/\" type=\"post\" id=\"2198\">vLLM<\/a><\/strong> comme backend LLM (via LangChain ou API OpenAI-compatible)<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/01\/qdrant-base-vectorielle-open-source-pour-le-rag-et-la-recherche-semantique\/\" type=\"post\" id=\"2159\">Qdrant<\/a><\/strong> pour le retrieval vectoriel dans les n\u0153uds RAG<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/03\/30\/n8n-automatiser-ses-workflows\/\" type=\"post\" id=\"2144\">n8n<\/a><\/strong> pour d\u00e9clencher un agent via webhook ou planification<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/02\/langfuse-observer-et-evaluer-ses-pipelines-llm-open-source-en-production\/\" type=\"post\" id=\"2162\">Langfuse<\/a><\/strong> pour tracer chaque \u00e9tape du graphe (chaque n\u0153ud, chaque appel LLM, chaque outil)<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/03\/22\/optimiser-postgresql-pour-une-stack-open-source-tuning-maintenance-et-haute-disponibilite\/\" type=\"post\" id=\"2116\">PostgreSQL<\/a><\/strong> comme checkpointer persistant en production<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/03\/05\/mcp-plus-que-api-deployer-un-serveur-mcp-avec-fastmcp-pour-exposer-vos-outils-internes-aux-agents-ia\/\" type=\"post\" id=\"1970\">MCP<\/a><\/strong> pour exposer des outils externes \u00e0 l&rsquo;agent via le protocole standard<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">LangGraph vs. les alternatives<\/h3>\n\n\n\n<p>D&rsquo;autres frameworks existent pour construire des agents&nbsp;: <strong>CrewAI<\/strong> (orient\u00e9 r\u00f4les et collaboration), <strong>AutoGen<\/strong> (Microsoft, multi-agent conversationnel), <strong>Haystack<\/strong> (pipelines modulaires). LangGraph se distingue par sa granularit\u00e9 de contr\u00f4le&nbsp;: on d\u00e9finit explicitement chaque transition, chaque condition, chaque point d&rsquo;interruption. C&rsquo;est moins magique mais plus pr\u00e9dictible, ce qui compte en production quand on a besoin de garantir un comportement d\u00e9terministe et de d\u00e9boguer finement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Points de vigilance en production<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Boucles infinies&nbsp;:<\/strong> toujours d\u00e9finir un compteur de r\u00e9cursion maximal (<code>recursion_limit<\/code>) pour \u00e9viter qu&rsquo;un agent tourne ind\u00e9finiment.<\/li>\n\n\n\n<li><strong>Co\u00fbt et latence&nbsp;:<\/strong> chaque cycle du graphe implique un appel LLM. Un agent qui boucle 8 fois sur un probl\u00e8me co\u00fbte 8\u00d7 en tokens et en temps. Monitorer avec Langfuse.<\/li>\n\n\n\n<li><strong>D\u00e9terminisme&nbsp;:<\/strong> les LLM sont stochastiques. Le m\u00eame \u00e9tat peut produire des d\u00e9cisions diff\u00e9rentes. Pr\u00e9voir des tests de non-r\u00e9gression sur les chemins critiques.<\/li>\n\n\n\n<li><strong>S\u00e9curit\u00e9 des outils&nbsp;:<\/strong> un agent qui a acc\u00e8s \u00e0 des outils d&rsquo;\u00e9criture (API, base de donn\u00e9es, fichiers) doit \u00eatre sandbox\u00e9. Le pattern human-in-the-loop est indispensable pour les actions irr\u00e9versibles.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Pour aller plus loin<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Documentation officielle&nbsp;: <a href=\"https:\/\/langchain-ai.github.io\/langgraph\/\">langchain-ai.github.io\/langgraph<\/a><\/li>\n\n\n\n<li>D\u00e9p\u00f4t GitHub&nbsp;: <a href=\"https:\/\/github.com\/langchain-ai\/langgraph\">github.com\/langchain-ai\/langgraph<\/a><\/li>\n\n\n\n<li>LangGraph Platform (option cloud ou self-hosted) pour le d\u00e9ploiement \u00e0 l&rsquo;\u00e9chelle<\/li>\n\n\n\n<li>Tutoriel  \u00ab&nbsp;Build a ReAct Agent&nbsp;\u00bb dans la documentation officielle<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>LangGraph&nbsp;: construire des agents IA autonomes avec orchestration, m\u00e9moire et outils Les LLM savent g\u00e9n\u00e9rer du texte. Mais un agent IA, c&rsquo;est autre chose&nbsp;: c&rsquo;est un programme qui raisonne, d\u00e9cide, utilise des outils, revient en arri\u00e8re si n\u00e9cessaire, et maintient un \u00e9tat entre les \u00e9tapes. LangGraph, biblioth\u00e8que open source de l&rsquo;\u00e9cosyst\u00e8me LangChain, permet de construire [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2213,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2212","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LangGraph : construire des agents IA autonomes avec orchestration, m\u00e9moire et outils - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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