[model-gateway] Dynamically Populate Tool Call Parser Choices (#14807)

sgl-model-gateway/bindings/python/src/lib.rs

@@ -1,5 +1,6 @@
 use pyo3::prelude::*;
 use sgl_model_gateway::*;
+use once_cell::sync::OnceCell;
 use std::collections::HashMap;
 
 // Define the enums with PyO3 bindings
@@ -730,6 +731,18 @@ fn get_verbose_version_string() -> String {
     version::get_verbose_version_string()
 }
 
+/// Get the list of available tool call parsers from the Rust factory.
+#[pyfunction]
+fn get_available_tool_call_parsers() -> Vec<String> {
+    static PARSERS: OnceCell<Vec<String>> = OnceCell::new();
+    PARSERS
+        .get_or_init(|| {
+            let factory = tool_parser::ParserFactory::new();
+            factory.list_parsers()
+        })
+        .clone()
+}
+
 #[pymodule]
 fn sglang_router_rs(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<PolicyType>()?;
@@ -740,5 +753,6 @@ fn sglang_router_rs(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<Router>()?;
     m.add_function(wrap_pyfunction!(get_version_string, m)?)?;
     m.add_function(wrap_pyfunction!(get_verbose_version_string, m)?)?;
+    m.add_function(wrap_pyfunction!(get_available_tool_call_parsers, m)?)?;
     Ok(())
 }