MCP's default query parameter hallucination

Falco · December 1, 2025, 8:33pm

latest-post is a valid parameter in the filter route:

lib/topics_filter.rb

main


      
          { name: "status:unlisted", description: I18n.t("filter.description.status_unlisted") },
          { name: "status:deleted", description: I18n.t("filter.description.status_deleted") },
          { name: "status:public", description: I18n.t("filter.description.status_public") },
          { name: "order:", description: I18n.t("filter.description.order"), priority: 1 },
          { name: "order:activity", description: I18n.t("filter.description.order_activity") },
          { name: "order:activity-asc", description: I18n.t("filter.description.order_activity_asc") },
          { name: "order:category", description: I18n.t("filter.description.order_category") },
          { name: "order:category-asc", description: I18n.t("filter.description.order_category_asc") },
          { name: "order:created", description: I18n.t("filter.description.order_created") },
          { name: "order:created-asc", description: I18n.t("filter.description.order_created_asc") },
          { name: "order:latest-post", description: I18n.t("filter.description.order_latest_post") },
          {
            name: "order:latest-post-asc",
            description: I18n.t("filter.description.order_latest_post_asc"),
          },
          { name: "order:likes", description: I18n.t("filter.description.order_likes") },
          { name: "order:likes-asc", description: I18n.t("filter.description.order_likes_asc") },
          { name: "order:likes-op", description: I18n.t("filter.description.order_likes_op") },
          { name: "order:likes-op-asc", description: I18n.t("filter.description.order_likes_op_asc") },
          { name: "order:posters", description: I18n.t("filter.description.order_posters") },
          { name: "order:posters-asc", description: I18n.t("filter.description.order_posters_asc") },

What do you mean?

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MCP's default query parameter hallucination

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