{"id":2410,"date":"2026-07-09T18:01:36","date_gmt":"2026-07-09T16:01:36","guid":{"rendered":"https:\/\/askem.eu\/?p=2410"},"modified":"2026-07-09T18:01:40","modified_gmt":"2026-07-09T16:01:40","slug":"a2a-le-protocole-open-source-qui-fait-dialoguer-vos-agents-ia-entre-eux","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/07\/09\/a2a-le-protocole-open-source-qui-fait-dialoguer-vos-agents-ia-entre-eux\/","title":{"rendered":"A2A : le protocole open source qui fait dialoguer vos agents IA entre eux"},"content":{"rendered":"

A2A : le protocole open source qui fait dialoguer vos agents IA entre eux<\/h2>\n\n\n\n

Le protocole Model Context Protocol (MCP) a r\u00e9gl\u00e9 la question de connecter un agent \u00e0 ses outils. Restait une autre brique : comment faire collaborer plusieurs agents autonomes, d\u00e9velopp\u00e9s par des \u00e9quipes ou des \u00e9diteurs diff\u00e9rents, sans tout r\u00e9\u00e9crire \u00e0 chaque int\u00e9gration. C’est exactement le r\u00f4le d’Agent2Agent<\/a> (A2A), un protocole ouvert d\u00e9sormais h\u00e9berg\u00e9 par la Linux Foundation.<\/p>\n\n\n\n

D’o\u00f9 vient A2A et pourquoi le regarder maintenant<\/h3>\n\n\n\n

A2A a \u00e9t\u00e9 annonc\u00e9 par Google en avril 2025, puis donn\u00e9 \u00e0 la Linux Foundation en juin 2025, sous licence Apache 2.0. Le projet est donc gouvern\u00e9 par une fondation neutre et ouvert aux contributions de toute la communaut\u00e9, ce qui limite le risque de verrouillage par un \u00e9diteur. En moins d’un an, il est pass\u00e9 d’une premi\u00e8re version \u00e0 un standard de production : plus de 150 organisations le soutiennent, parmi lesquelles Google, Microsoft, AWS, Salesforce, SAP, ServiceNow, Workday et IBM.<\/p>\n\n\n\n

Le probl\u00e8me que A2A r\u00e9sout<\/h3>\n\n\n\n

D\u00e8s qu’une organisation d\u00e9ploie plusieurs agents, par exemple un agent de tri documentaire, un agent de recherche et un agent de r\u00e9daction, se pose la question de leur coordination. Sans standard commun, chaque connexion devient une int\u00e9gration sur mesure, fragile et co\u00fbteuse \u00e0 maintenir. A2A fournit une couche d’interop\u00e9rabilit\u00e9 horizontale : un agent peut en d\u00e9couvrir un autre, lui d\u00e9l\u00e9guer une t\u00e2che, et suivre son avancement, m\u00eame si les deux sont \u00e9crits dans des frameworks diff\u00e9rents et h\u00e9berg\u00e9s sur des infrastructures distinctes.<\/p>\n\n\n\n

Comment \u00e7a marche, concr\u00e8tement<\/h3>\n\n\n\n

A2A r\u00e9utilise des standards \u00e9prouv\u00e9s plut\u00f4t que d’inventer une nouvelle pile technique : tout passe par HTTP, avec JSON-RPC 2.0 comme format d’\u00e9change et Server-Sent Events pour le streaming des r\u00e9ponses longues. Trois notions suffisent pour comprendre l’essentiel.<\/p>\n\n\n\n

    \n
  • L’Agent Card<\/strong> : un document JSON publi\u00e9 par chaque agent, qui d\u00e9crit son identit\u00e9, ses capacit\u00e9s, ses comp\u00e9tences, son point d’acc\u00e8s et ses exigences d’authentification. C’est la carte de visite qui permet \u00e0 un agent client de rep\u00e9rer le bon interlocuteur pour une t\u00e2che donn\u00e9e.<\/li>\n\n\n\n
  • La Task<\/strong> : l’unit\u00e9 de travail fondamentale, identifi\u00e9e par un identifiant unique. Une t\u00e2che est avec \u00e9tat et suit un cycle de vie d\u00e9fini, ce qui permet aux agents de rester synchronis\u00e9s sur l’avancement, y compris pour des traitements de longue dur\u00e9e.<\/li>\n\n\n\n
  • Le transport<\/strong> : le client envoie une requ\u00eate JSON-RPC 2.0 en HTTP POST vers le point d’acc\u00e8s du serveur, qui r\u00e9pond soit par une r\u00e9ponse classique, soit par un flux SSE pour les m\u00e9thodes en streaming.<\/li>\n<\/ul>\n\n\n\n

    A2A et MCP : compl\u00e9mentaires, pas concurrents<\/h3>\n\n\n\n

    La confusion est fr\u00e9quente, alors qu’il s’agit de deux couches distinctes. MCP normalise la connexion verticale entre un agent et ses outils ou services externes : il aide \u00e0 construire un agent puissant. A2A normalise la d\u00e9l\u00e9gation horizontale entre agents autonomes : il aide \u00e0 construire un syst\u00e8me d’agents. Dans une architecture m\u00fbre, les deux cohabitent : MCP pour donner des capacit\u00e9s \u00e0 chaque agent, A2A pour orchestrer leur collaboration.<\/p>\n\n\n\n

    \u00c0 retenir<\/strong> : si vous d\u00e9ployez d\u00e9j\u00e0 des serveurs MCP, A2A est la suite logique le jour o\u00f9 vous passez d’un agent isol\u00e9 \u00e0 plusieurs agents qui doivent se parler. Standard ouvert, licence Apache 2.0, gouvernance par la Linux Foundation : les conditions d’une adoption sereine et souveraine sont r\u00e9unies.<\/p>\n\n\n\n

    Par o\u00f9 commencer<\/h3>\n\n\n\n

    La sp\u00e9cification, les SDK et des exemples sont publics sur le d\u00e9p\u00f4t officiel du projet. Une premi\u00e8re approche utile consiste \u00e0 publier l’Agent Card d’un agent existant, puis \u00e0 \u00e9crire un agent client minimal qui le d\u00e9couvre et lui d\u00e9l\u00e8gue une t\u00e2che simple. C’est le meilleur moyen de mesurer ce que A2A change dans une architecture multi-agents avant de l’industrialiser.<\/p>\n\n\n\n

    <\/p>","protected":false},"excerpt":{"rendered":"

    A2A : le protocole open source qui fait dialoguer vos agents IA entre eux Le protocole Model Context Protocol (MCP) a r\u00e9gl\u00e9 la question de connecter un agent \u00e0 ses outils. Restait une autre brique : comment faire collaborer plusieurs agents autonomes, d\u00e9velopp\u00e9s par des \u00e9quipes ou des \u00e9diteurs diff\u00e9rents, sans tout r\u00e9\u00e9crire \u00e0 chaque int\u00e9gration. C’est […]<\/p>\n","protected":false},"author":1,"featured_media":2411,"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-2410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai","entry","has-media"],"yoast_head":"\nA2A : le protocole open source qui fait dialoguer vos agents IA entre eux - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D'\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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