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


      
            type: "number",
          },
          {
            name: "likes-op-max:",
            description: I18n.t("filter.description.likes_op_max"),
            type: "number",
          },
          { name: "posts-min:", description: I18n.t("filter.description.posts_min"), type: "number" },
          { name: "posts-max:", description: I18n.t("filter.description.posts_max"), type: "number" },
          {
            name: "posters-min:",
            description: I18n.t("filter.description.posters_min"),
            type: "number",
          },
          {
            name: "posters-max:",
            description: I18n.t("filter.description.posters_max"),
            type: "number",
          },
          { name: "views-min:", description: I18n.t("filter.description.views_min"), type: "number" },
          { name: "views-max:", description: I18n.t("filter.description.views_max"), type: "number" },

What do you mean?

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MCP's default query parameter hallucination

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