diff --git a/detect/detect_test.go b/detect/detect_test.go
index 74ab89c..0d0d709 100644
--- a/detect/detect_test.go
+++ b/detect/detect_test.go
@@ -658,6 +658,125 @@ func TestNodeProject(t *testing.T) {
 	}
 }
 
+func TestNodeRustNativeExtensions(t *testing.T) {
+	t.Run("projects", func(t *testing.T) {
+		tests := []struct {
+			name    string
+			fixture string
+			tool    string
+		}{
+			{name: "napi-rs", fixture: "../testdata/napi-rs-project", tool: "napi-rs"},
+			{name: "Neon", fixture: "../testdata/neon-project", tool: "Neon"},
+		}
+
+		for _, tt := range tests {
+			t.Run(tt.name, func(t *testing.T) {
+				r := runOn(t, tt.fixture)
+				assertToolDetectedWithConfidence(t, r, "native_extension", tt.tool, brief.ConfidenceHigh)
+			})
+		}
+	})
+
+	t.Run("signals", func(t *testing.T) {
+		tests := []struct {
+			name  string
+			files map[string]string
+			tool  string
+		}{
+			{
+				name: "napi-rs npm dependency",
+				files: map[string]string{
+					"package.json": `{"name":"example","devDependencies":{"@napi-rs/cli":"^3.0.0"}}`,
+				},
+				tool: "napi-rs",
+			},
+			{
+				name: "napi-rs build script",
+				files: map[string]string{
+					"package.json": `{"name":"example","scripts":{"build":"napi build --platform --release"}}`,
+				},
+				tool: "napi-rs",
+			},
+			{
+				name: "napi crate",
+				files: map[string]string{
+					"package.json": `{"name":"example"}`,
+					"Cargo.toml":   "[package]\nname = \"example\"\nversion = \"0.1.0\"\n[dependencies]\nnapi = \"3\"\n",
+				},
+				tool: "napi-rs",
+			},
+			{
+				name: "napi-derive crate",
+				files: map[string]string{
+					"package.json": `{"name":"example"}`,
+					"Cargo.toml":   "[package]\nname = \"example\"\nversion = \"0.1.0\"\n[dependencies]\nnapi-derive = \"3\"\n",
+				},
+				tool: "napi-rs",
+			},
+			{
+				name: "napi-build crate",
+				files: map[string]string{
+					"package.json": `{"name":"example"}`,
+					"Cargo.toml":   "[package]\nname = \"example\"\nversion = \"0.1.0\"\n[build-dependencies]\nnapi-build = \"2\"\n",
+				},
+				tool: "napi-rs",
+			},
+			{
+				name: "Neon npm dependency",
+				files: map[string]string{
+					"package.json": `{"name":"example","devDependencies":{"@neon-rs/cli":"^0.1.82"}}`,
+				},
+				tool: "Neon",
+			},
+			{
+				name: "Neon Cargo dependency",
+				files: map[string]string{
+					"package.json": `{"name":"example"}`,
+					"Cargo.toml":   "[package]\nname = \"example\"\nversion = \"0.1.0\"\n[dependencies.neon]\nversion = \"1.1\"\n",
+				},
+				tool: "Neon",
+			},
+		}
+
+		for _, tt := range tests {
+			t.Run(tt.name, func(t *testing.T) {
+				dir := t.TempDir()
+				for path, content := range tt.files {
+					writeProjectFile(t, dir, path, content)
+				}
+				r := runOn(t, dir)
+				assertToolDetectedWithConfidence(t, r, "native_extension", tt.tool, brief.ConfidenceHigh)
+			})
+		}
+	})
+
+	t.Run("near miss", func(t *testing.T) {
+		dir := t.TempDir()
+		writeProjectFile(
+			t,
+			dir,
+			"package.json",
+			`{"name":"near-miss","dependencies":{"napi":"1","neon":"1"},"scripts":{"palette":"echo neon"}}`,
+		)
+		writeProjectFile(
+			t,
+			dir,
+			"Cargo.toml",
+			"[package]\nname = \"near-miss\"\nversion = \"0.1.0\"\n[dependencies]\nother-napi = \"1\"\nultraviolet-neon = \"1\"\n",
+		)
+		writeProjectFile(t, dir, "README.md", "napi-rs uses the napi build command.\n")
+
+		r := runOn(t, dir)
+		for _, name := range []string{"napi-rs", "Neon"} {
+			if slices.ContainsFunc(r.Tools["native_extension"], func(d brief.Detection) bool {
+				return d.Name == name
+			}) {
+				t.Errorf("prose mention should not detect %s", name)
+			}
+		}
+	})
+}
+
 func TestPythonProject(t *testing.T) {
 	engine := New(loadKB(t), "../testdata/python-project")
 	r, err := engine.Run()
diff --git a/knowledge/node/napi-rs.toml b/knowledge/node/napi-rs.toml
new file mode 100644
index 0000000..02371f2
--- /dev/null
+++ b/knowledge/node/napi-rs.toml
@@ -0,0 +1,37 @@
+[tool]
+name = "napi-rs"
+category = "native_extension"
+homepage = "https://napi.rs/"
+docs = "https://napi.rs/docs/introduction/getting-started"
+repo = "https://github.com/napi-rs/napi-rs"
+description = "Builds Node-API addons written in Rust"
+
+# Match the Cargo crates in Cargo.toml rather than through the global dependency
+# cache so same-named npm packages do not trigger this definition.
+[detect]
+dependencies = ["@napi-rs/cli"]
+ecosystems = ["node"]
+
+[detect.file_contains]
+"package.json" = ["napi build"]
+"Cargo.toml" = [
+  "\nnapi =",
+  "\nnapi=",
+  "\nnapi-derive =",
+  "\nnapi-derive=",
+  "\nnapi-build =",
+  "\nnapi-build=",
+  "[dependencies.napi]",
+  "[dependencies.napi-derive]",
+  "[build-dependencies.napi-build]",
+]
+
+[commands]
+run = "npx napi build --platform --release"
+alternatives = ["npx napi build"]
+
+[config]
+files = ["package.json", "Cargo.toml", "build.rs"]
+
+[taxonomy]
+role = ["native-extension"]
diff --git a/knowledge/node/neon.toml b/knowledge/node/neon.toml
new file mode 100644
index 0000000..9b3c60b
--- /dev/null
+++ b/knowledge/node/neon.toml
@@ -0,0 +1,26 @@
+[tool]
+name = "Neon"
+category = "native_extension"
+homepage = "https://neon-rs.dev/"
+docs = "https://neon-rs.dev/docs/hello-world/"
+repo = "https://github.com/neon-bindings/neon"
+description = "Builds Node.js native addons written in Rust"
+
+# Match the Cargo crate in Cargo.toml rather than through the global dependency
+# cache so a same-named npm package does not trigger this definition.
+[detect]
+dependencies = ["@neon-rs/cli"]
+ecosystems = ["node"]
+
+[detect.file_contains]
+"Cargo.toml" = ["\nneon =", "\nneon=", "[dependencies.neon]"]
+
+[commands]
+run = "npm run build"
+alternatives = ["npm run build -- --release"]
+
+[config]
+files = ["package.json", "Cargo.toml"]
+
+[taxonomy]
+role = ["native-extension"]
diff --git a/testdata/napi-rs-project/Cargo.toml b/testdata/napi-rs-project/Cargo.toml
new file mode 100644
index 0000000..56be32f
--- /dev/null
+++ b/testdata/napi-rs-project/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "napi-rs-project"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+napi = { version = "3", features = ["napi8"] }
+napi-derive = "3"
+
+[build-dependencies]
+napi-build = "2"
diff --git a/testdata/napi-rs-project/package.json b/testdata/napi-rs-project/package.json
new file mode 100644
index 0000000..cdc9ca8
--- /dev/null
+++ b/testdata/napi-rs-project/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "napi-rs-project",
+  "version": "0.1.0",
+  "scripts": {
+    "build": "napi build --platform --release"
+  },
+  "devDependencies": {
+    "@napi-rs/cli": "^3.0.0"
+  }
+}
diff --git a/testdata/napi-rs-project/src/lib.rs b/testdata/napi-rs-project/src/lib.rs
new file mode 100644
index 0000000..ace84d3
--- /dev/null
+++ b/testdata/napi-rs-project/src/lib.rs
@@ -0,0 +1 @@
+pub fn fixture() {}
diff --git a/testdata/neon-project/Cargo.toml b/testdata/neon-project/Cargo.toml
new file mode 100644
index 0000000..6dfecc4
--- /dev/null
+++ b/testdata/neon-project/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "neon-project"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies.neon]
+version = "1.1"
+features = ["napi-8"]
diff --git a/testdata/neon-project/package.json b/testdata/neon-project/package.json
new file mode 100644
index 0000000..2fc1cb1
--- /dev/null
+++ b/testdata/neon-project/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "neon-project",
+  "version": "0.1.0",
+  "scripts": {
+    "cargo-build": "cargo build --message-format=json-render-diagnostics > cargo.log",
+    "postcargo-build": "neon dist < cargo.log",
+    "build": "npm run cargo-build -- --release"
+  },
+  "devDependencies": {
+    "@neon-rs/cli": "^0.1.82"
+  }
+}
diff --git a/testdata/neon-project/src/lib.rs b/testdata/neon-project/src/lib.rs
new file mode 100644
index 0000000..ace84d3
--- /dev/null
+++ b/testdata/neon-project/src/lib.rs
@@ -0,0 +1 @@
+pub fn fixture() {}