diff --git a/src/tools/rust-analyzer/crates/hir-def/src/attr/builtin.rs b/src/tools/rust-analyzer/crates/hir-def/src/attr/builtin.rs
index 55b9a1dfdcb91..8c8df08e8559d 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/attr/builtin.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/attr/builtin.rs
@@ -12,9 +12,6 @@ use std::sync::OnceLock;
 
 use rustc_hash::FxHashMap;
 
-/// Ignored attribute namespaces used by tools.
-pub const TOOL_MODULES: &[&str] = &["rustfmt", "clippy"];
-
 pub struct BuiltinAttribute {
     pub name: &'static str,
     pub template: AttributeTemplate,
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/nameres.rs b/src/tools/rust-analyzer/crates/hir-def/src/nameres.rs
index a528c4cc6972d..497b69889acc6 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/nameres.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/nameres.rs
@@ -84,6 +84,14 @@ use crate::{
     LocalModuleId, Lookup, MacroExpander, MacroId, ModuleId, ProcMacroId, UseId,
 };
 
+const PREDEFINED_TOOLS: &[SmolStr] = &[
+    SmolStr::new_static("clippy"),
+    SmolStr::new_static("rustfmt"),
+    SmolStr::new_static("diagnostic"),
+    SmolStr::new_static("miri"),
+    SmolStr::new_static("rust_analyzer"),
+];
+
 /// Contains the results of (early) name resolution.
 ///
 /// A `DefMap` stores the module tree and the definitions that are in scope in every module after
@@ -160,7 +168,7 @@ impl DefMapCrateData {
             fn_proc_macro_mapping: FxHashMap::default(),
             proc_macro_loading_error: None,
             registered_attrs: Vec::new(),
-            registered_tools: Vec::new(),
+            registered_tools: PREDEFINED_TOOLS.into(),
             unstable_features: FxHashSet::default(),
             rustc_coherence_is_core: false,
             no_core: false,
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/nameres/attr_resolution.rs b/src/tools/rust-analyzer/crates/hir-def/src/nameres/attr_resolution.rs
index eb7f4c05ae217..3cb0666edf9c3 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/nameres/attr_resolution.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/nameres/attr_resolution.rs
@@ -10,7 +10,7 @@ use syntax::{ast, SmolStr};
 use triomphe::Arc;
 
 use crate::{
-    attr::builtin::{find_builtin_attr_idx, TOOL_MODULES},
+    attr::builtin::find_builtin_attr_idx,
     db::DefDatabase,
     item_scope::BuiltinShadowMode,
     nameres::path_resolution::ResolveMode,
@@ -82,8 +82,7 @@ impl DefMap {
             let name = name.to_smol_str();
             let pred = |n: &_| *n == name;
 
-            let registered = self.data.registered_tools.iter().map(SmolStr::as_str);
-            let is_tool = TOOL_MODULES.iter().copied().chain(registered).any(pred);
+            let is_tool = self.data.registered_tools.iter().map(SmolStr::as_str).any(pred);
             // FIXME: tool modules can be shadowed by actual modules
             if is_tool {
                 return true;
diff --git a/src/tools/rust-analyzer/crates/hir/src/lib.rs b/src/tools/rust-analyzer/crates/hir/src/lib.rs
index 85f33a10fcb2d..a902ae2d3363f 100644
--- a/src/tools/rust-analyzer/crates/hir/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/lib.rs
@@ -3372,34 +3372,21 @@ impl BuiltinAttr {
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct ToolModule {
-    krate: Option<CrateId>,
+    krate: CrateId,
     idx: u32,
 }
 
 impl ToolModule {
-    // FIXME: consider crates\hir_def\src\nameres\attr_resolution.rs?
     pub(crate) fn by_name(db: &dyn HirDatabase, krate: Crate, name: &str) -> Option<Self> {
-        if let builtin @ Some(_) = Self::builtin(name) {
-            return builtin;
-        }
+        let krate = krate.id;
         let idx =
-            db.crate_def_map(krate.id).registered_tools().iter().position(|it| it == name)? as u32;
-        Some(ToolModule { krate: Some(krate.id), idx })
-    }
-
-    fn builtin(name: &str) -> Option<Self> {
-        hir_def::attr::builtin::TOOL_MODULES
-            .iter()
-            .position(|&tool| tool == name)
-            .map(|idx| ToolModule { krate: None, idx: idx as u32 })
+            db.crate_def_map(krate).registered_tools().iter().position(|it| it == name)? as u32;
+        Some(ToolModule { krate, idx })
     }
 
     pub fn name(&self, db: &dyn HirDatabase) -> SmolStr {
         // FIXME: Return a `Name` here
-        match self.krate {
-            Some(krate) => db.crate_def_map(krate).registered_tools()[self.idx as usize].clone(),
-            None => SmolStr::new(hir_def::attr::builtin::TOOL_MODULES[self.idx as usize]),
-        }
+        db.crate_def_map(self.krate).registered_tools()[self.idx as usize].clone()
     }
 }