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diff --git a/games/rstnode/rst-core/src/config/mod.rs b/games/rstnode/rst-core/src/config/mod.rs
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index 000000000000..447c0fcbcc35
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+++ b/games/rstnode/rst-core/src/config/mod.rs
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+//! The file formats backing maps and other configs
+//!
+//! When creating maps to share with other clients, or to load into a
+//! server, these types can be constructed with the YML description
+//! format, outlined in [load_map](config::io::load_map)
+
+mod io;
+pub use io::*;
+
+use crate::data::{LinkId, NodeId};
+use serde::{Deserialize, Serialize};
+
+/// A config tree that describes a map
+#[derive(Serialize, Deserialize)]
+pub struct MapCfg {
+    /// The set of nodes
+    pub nodes: Vec<NodeCfg>,
+    /// Links connecting nodes
+    pub links: Vec<LinkCfg>,
+    /// Default spawn points (player count)
+    pub spawns: Vec<SpawnCfg>,
+}
+
+/// A single node on a map, with an x and y coordinate
+#[derive(Serialize, Deserialize)]
+pub struct NodeCfg {
+    /// Node ID
+    pub id: NodeId,
+    /// Render/world position
+    pub x: f64,
+    pub y: f64,
+}
+
+/// A link between two nodes
+#[derive(Serialize, Deserialize)]
+pub struct LinkCfg {
+    /// The link ID
+    id: LinkId,
+    /// List of connectioned nodes
+    con: (NodeId, NodeId),
+}
+
+/// Special configuration for a node to act as a player spawn point
+#[derive(Serialize, Deserialize)]
+pub struct SpawnCfg {
+    /// The node of the spawn point
+    pub n_id: NodeId,
+    /// At what number of players is this spawn available?
+    pub max_players: usize,
+}