{"id":2125,"date":"2026-03-24T10:20:08","date_gmt":"2026-03-24T09:20:08","guid":{"rendered":"https:\/\/askem.eu\/?p=2125"},"modified":"2026-03-24T10:20:10","modified_gmt":"2026-03-24T09:20:10","slug":"le-model-context-protocol-mcp-connecter-ses-agents-ia-a-des-outils-et-services","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/03\/24\/le-model-context-protocol-mcp-connecter-ses-agents-ia-a-des-outils-et-services\/","title":{"rendered":"Le Model Context Protocol (MCP) : connecter ses agents IA \u00e0 des outils et services"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Le Model Context Protocol (MCP)&nbsp;: connecter ses agents IA \u00e0 des outils et services<\/h2>\n\n\n\n<p>Les agents IA comme Claude ne sont vraiment utiles que lorsqu&rsquo;ils peuvent agir sur leur environnement&nbsp;: lire des fichiers, interroger des APIs, ex\u00e9cuter des commandes, consulter des bases de donn\u00e9es. Le Model Context Protocol (MCP), standardis\u00e9 par Anthropic en 2024 et aujourd&rsquo;hui largement adopt\u00e9, d\u00e9finit un protocole ouvert pour connecter un LLM \u00e0 n&rsquo;importe quel service externe. Cet article pr\u00e9sente son fonctionnement, ses cas d&rsquo;usage concrets, et comment l&rsquo;int\u00e9grer dans une infrastructure open source.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pourquoi un protocole d\u00e9di\u00e9 aux outils des agents IA&nbsp;?<\/h3>\n\n\n\n<p>Avant MCP, chaque int\u00e9gration entre un LLM et un outil externe \u00e9tait une solution sur-mesure&nbsp;: une fonction ad hoc, un wrapper sp\u00e9cifique, une API propri\u00e9taire. Le r\u00e9sultat&nbsp;: des silos, des doublons, des incompatibilit\u00e9s entre mod\u00e8les et environnements. D\u00e8s qu&rsquo;on voulait r\u00e9utiliser un outil (par exemple, une recherche dans CKAN) dans un autre contexte d&rsquo;agent, il fallait tout r\u00e9\u00e9crire.<\/p>\n\n\n\n<p>MCP r\u00e9sout ce probl\u00e8me en d\u00e9finissant un contrat standard&nbsp;: un <em>serveur MCP<\/em> expose des outils (tools), des ressources (resources) et des invites (prompts) via une interface JSON-RPC normalis\u00e9e. Le client MCP \u2014 l&rsquo;agent IA ou l&rsquo;application h\u00f4te \u2014 peut alors d\u00e9couvrir dynamiquement ce que le serveur sait faire et l&rsquo;invoquer de mani\u00e8re structur\u00e9e. Un serveur MCP \u00e9crit une fois peut \u00eatre consomm\u00e9 par Claude Desktop, Claude Code, ou n&rsquo;importe quelle application compatible.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Architecture&nbsp;: h\u00f4te, client, serveur<\/h3>\n\n\n\n<p>MCP distingue trois r\u00f4les&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>L&rsquo;h\u00f4te<\/strong>&nbsp;: l&rsquo;application qui embarque le LLM et orchestre la session (Claude Desktop, une application Python, un syst\u00e8me d&rsquo;agents custom).<\/li>\n\n\n\n<li><strong>Le client MCP<\/strong>&nbsp;: le composant dans l&rsquo;h\u00f4te qui g\u00e8re les connexions aux serveurs MCP et fait le lien avec le mod\u00e8le de langage.<\/li>\n\n\n\n<li><strong>Le serveur MCP<\/strong>&nbsp;: le processus qui expose les capacit\u00e9s (outils, ressources, prompts) vers l&rsquo;h\u00f4te. Il peut s&rsquo;ex\u00e9cuter localement (via stdio) ou \u00e0 distance (via SSE ou WebSocket).<\/li>\n<\/ul>\n\n\n\n<p>Le serveur MCP expose ses capacit\u00e9s via trois primitives. Les <strong>tools<\/strong> sont des fonctions que le LLM peut appeler pour effectuer une action (requ\u00eate SQL, appel API, \u00e9criture de fichier). Les <strong>resources<\/strong> sont des donn\u00e9es que le serveur peut mettre \u00e0 disposition du mod\u00e8le sous forme de contexte (contenu d&rsquo;un fichier, r\u00e9sultat d&rsquo;une requ\u00eate, page web). Les <strong>prompts<\/strong> sont des mod\u00e8les d&rsquo;invite pr\u00e9configur\u00e9s que l&rsquo;utilisateur peut activer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9crire un serveur MCP&nbsp;: exemple avec FastMCP en Python<\/h3>\n\n\n\n<p>Le SDK Python officiel (et sa surcouche <code>FastMCP<\/code>) permet d&rsquo;\u00e9crire un serveur MCP en quelques dizaines de lignes. L&rsquo;exemple suivant expose un outil permettant \u00e0 un agent IA d&rsquo;interroger l&rsquo;API CKAN d&rsquo;un portail open data&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from mcp.server.fastmcp import FastMCP\nimport httpx\n\nmcp = FastMCP(\"ckan-portail\")\n\n@mcp.tool()\nasync def rechercher_datasets(query: str, portail_url: str = \"https:\/\/data.monportail.fr\") -&gt; str:\n    \"\"\"Recherche des jeux de donn\u00e9es dans un portail CKAN.\"\"\"\n    url = f\"{portail_url}\/api\/3\/action\/package_search\"\n    async with httpx.AsyncClient() as client:\n        r = await client.get(url, params={\"q\": query, \"rows\": 5})\n        resultats = r.json()&#91;\"result\"]&#91;\"results\"]\n    return \"\\n\".join(f\"- {d&#91;'title']} ({d&#91;'name']})\" for d in resultats)\n\nif __name__ == \"__main__\":\n    mcp.run(transport=\"stdio\")<\/code><\/pre>\n\n\n\n<p>En ajoutant ce serveur dans la configuration de Claude Desktop (fichier <code>claude_desktop_config.json<\/code>), l&rsquo;agent peut d\u00e9sormais rechercher des jeux de donn\u00e9es open data \u00e0 la demande, sans aucune configuration suppl\u00e9mentaire dans le prompt.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cas d&rsquo;usage dans une infrastructure open source<\/h3>\n\n\n\n<p>MCP prend tout son sens dans une stack auto-h\u00e9berg\u00e9e, o\u00f9 l&rsquo;on contr\u00f4le les APIs et les donn\u00e9es. Quelques exemples&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Serveur MCP pour CKAN&nbsp;:<\/strong> exposer la recherche, la lecture de jeux de donn\u00e9es et l&rsquo;acc\u00e8s aux ressources d&rsquo;un portail open data directement \u00e0 un agent.<\/li>\n\n\n\n<li><strong>Serveur MCP pour Gitea&nbsp;:<\/strong> lire des d\u00e9p\u00f4ts, cr\u00e9er des issues, consulter l&rsquo;historique de commits depuis un agent de revue de code ou de documentation.<\/li>\n\n\n\n<li><strong>Serveur MCP pour PostgreSQL&nbsp;:<\/strong> permettre \u00e0 un agent IA d&rsquo;ex\u00e9cuter des requ\u00eates SQL en lecture sur une base de donn\u00e9es analytique, avec contr\u00f4le des droits par r\u00f4le.<\/li>\n\n\n\n<li><strong>Serveur MCP pour Nextcloud&nbsp;:<\/strong> lire et \u00e9crire des fichiers dans un espace documentaire, alimenter un agent de gestion de connaissances.<\/li>\n\n\n\n<li><strong>Serveur MCP de monitoring&nbsp;:<\/strong> interroger Prometheus, lire les alertes Grafana, permettre \u00e0 un agent de diagnostic de r\u00e9pondre \u00e0 des questions sur l&rsquo;\u00e9tat de l&rsquo;infrastructure.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e9curit\u00e9 et p\u00e9rim\u00e8tre d&rsquo;acc\u00e8s<\/h3>\n\n\n\n<p>Un serveur MCP h\u00e9rite des droits du processus qui l&rsquo;ex\u00e9cute. Il est donc crucial de l&rsquo;ex\u00e9cuter avec des permissions minimales&nbsp;: acc\u00e8s en lecture seule aux bases de donn\u00e9es quand c&rsquo;est suffisant, token API \u00e0 port\u00e9e restreinte, isolation r\u00e9seau si le serveur est expos\u00e9 \u00e0 distance. Les transports SSE (Server-Sent Events) pour les serveurs distants doivent \u00eatre prot\u00e9g\u00e9s par authentification \u2014 un token Bearer ou une mTLS selon le niveau d&rsquo;exposition.<\/p>\n\n\n\n<p>Il faut \u00e9galement penser \u00e0 la tra\u00e7abilit\u00e9&nbsp;: chaque appel d&rsquo;outil par un agent est une action avec des effets potentiels. Journaliser les appels MCP \u2014 quel outil, avec quels param\u00e8tres, \u00e0 quelle heure \u2014 est une bonne pratique, surtout pour les outils qui modifient des donn\u00e9es.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L&rsquo;\u00e9cosyst\u00e8me MCP en 2026<\/h3>\n\n\n\n<p>Le protocole MCP s&rsquo;est rapidement impos\u00e9 comme un standard de facto pour l&rsquo;outillage des agents IA. Des centaines de serveurs MCP sont aujourd&rsquo;hui disponibles en open source&nbsp;: pour GitHub, Slack, PostgreSQL, Elasticsearch, les navigateurs web, les syst\u00e8mes de fichiers, et bien d&rsquo;autres. La sp\u00e9cification est ouverte, impl\u00e9ment\u00e9e en Python, TypeScript, Go, Rust, et int\u00e9gr\u00e9e nativement dans Claude Desktop, Claude Code, et de nombreux frameworks d&rsquo;agents (LangChain, CrewAI, AutoGen).<\/p>\n\n\n\n<p>Pour une infrastructure open source auto-h\u00e9berg\u00e9e, \u00e9crire ses propres serveurs MCP est la m\u00e9thode la plus directe pour donner \u00e0 ses agents IA un acc\u00e8s structur\u00e9, auditable et maintenable aux syst\u00e8mes internes \u2014 sans exposer ces syst\u00e8mes \u00e0 des tiers ni d\u00e9pendre d&rsquo;int\u00e9grations propri\u00e9taires.<\/p>","protected":false},"excerpt":{"rendered":"<p>Le Model Context Protocol (MCP)&nbsp;: connecter ses agents IA \u00e0 des outils et services Les agents IA comme Claude ne sont vraiment utiles que lorsqu&rsquo;ils peuvent agir sur leur environnement&nbsp;: lire des fichiers, interroger des APIs, ex\u00e9cuter des commandes, consulter des bases de donn\u00e9es. Le Model Context Protocol (MCP), standardis\u00e9 par Anthropic en 2024 et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2126,"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-2125","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>Le Model Context Protocol (MCP) : connecter ses agents IA \u00e0 des outils et services - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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