diff --git a/server/src/config.rs b/server/src/config.rs
index d66cb33..5cd8d22 100644
--- a/server/src/config.rs
+++ b/server/src/config.rs
@@ -245,66 +245,29 @@ pub struct SessionConfig {
 /// The shape `config.ron` had before setups (up to 2026-08-28).
 ///
 /// Here only so an existing install upgrades rather than refusing to
-/// start. Nothing else may use these types, and when no install can
-/// plausibly still be on that shape they go, along with the branch in
-/// [`Config::load`] that reaches them.
+/// start, and **due for deletion as soon as it has run**. There is one
+/// backend and one phone, so once they are past this shape nothing
+/// anywhere is still on it, and a second parsing path that nothing
+/// exercises only constrains later changes to the schema.
+///
+/// The reader for the kebab-case driver kind has already gone for that
+/// reason. Delete the rest -- this module and the branch in
+/// [`Config::load`] that reaches it -- once the host has started on a
+/// build containing it.
 mod legacy {
     use serde::Deserialize;
 
-    use super::{DriverKind, ProviderConfig, TokenEntry};
+    use super::{ProviderConfig, TokenEntry};
 
     #[derive(Deserialize, Default)]
     #[serde(rename_all = "camelCase", default)]
     pub struct Config {
         pub tokens: Vec<TokenEntry>,
-        pub providers: Vec<Provider>,
+        pub providers: Vec<ProviderConfig>,
         pub hosts: Vec<Host>,
         pub sessions: Vec<Session>,
     }
 
-    /// A provider, when the driver kind was spelled in kebab case.
-    ///
-    /// Both spellings are accepted because the rename happened on the same
-    /// day as the RON move, so a config written that morning says
-    /// `r#claude-cli` and one written that afternoon says `claude_cli`.
-    /// Reading only one of them would turn this migration into a different
-    /// crash.
-    #[derive(Deserialize)]
-    #[serde(rename_all = "camelCase")]
-    pub struct Provider {
-        pub name: String,
-        pub kind: LegacyKind,
-        #[serde(default)]
-        pub command: Option<String>,
-        #[serde(default)]
-        pub models: Vec<String>,
-    }
-
-    #[derive(Deserialize, Clone, Copy)]
-    #[serde(rename_all = "snake_case")]
-    pub enum LegacyKind {
-        Echo,
-        #[serde(alias = "claude-cli")]
-        ClaudeCli,
-        #[serde(alias = "llama-cpp")]
-        LlamaCpp,
-    }
-
-    impl From<Provider> for ProviderConfig {
-        fn from(old: Provider) -> Self {
-            Self {
-                name: old.name,
-                kind: match old.kind {
-                    LegacyKind::Echo => DriverKind::Echo,
-                    LegacyKind::ClaudeCli => DriverKind::ClaudeCli,
-                    LegacyKind::LlamaCpp => DriverKind::LlamaCpp,
-                },
-                command: old.command,
-                models: old.models,
-            }
-        }
-    }
-
     /// A machine, when the name lived on the connection rather than on a
     /// setup.
     #[derive(Deserialize)]
@@ -454,7 +417,7 @@ impl Config {
             id: LOCAL_SETUP_ID.to_string(),
             name: LOCAL_SETUP.to_string(),
             ssh: None,
-            providers: old.providers.into_iter().map(Into::into).collect(),
+            providers: old.providers,
         });
         // Name and id both taken from the old host's name: it is what
         // sessions referenced, so reusing it is what lets them keep
@@ -675,10 +638,8 @@ mod tests {
         let path = dir.path().join("config.ron");
         std::fs::write(
             &path,
-            // `r#claude-cli` deliberately: the kebab spelling and the RON
-            // move landed the same day, so a real file may have either.
             "tokens: [(name: \"phone\", sha256: \"ab\")],\n\
-             providers: [(name: \"claude-cli\", kind: r#claude-cli, models: [\"opus\"])],\n\
+             providers: [(name: \"claude-cli\", kind: claude_cli, models: [\"opus\"])],\n\
              hosts: [(name: \"dev vm\", address: \"bob@10.0.0.2\", port: 2222)],\n\
              sessions: [\n\
              (id: \"a\", provider: \"claude-cli\", host: \"dev vm\", title: \"remote\", created: 1.0),\n\