diff --git a/arch/arch_config_schema.yaml b/arch/arch_config_schema.yaml
index a11e9562..0f7e55ac 100644
--- a/arch/arch_config_schema.yaml
+++ b/arch/arch_config_schema.yaml
@@ -92,6 +92,8 @@ properties:
                 type: array
                 items:
                   type: string
+              in_path:
+                type: boolean
             additionalProperties: false
             required:
               - name
@@ -108,6 +110,11 @@ properties:
           required:
             - name
             - path
+        http_method:
+          type: string
+          enum:
+            - GET
+            - POST
         system_prompt:
           type: string
       additionalProperties: false
diff --git a/arch/tools/cli/config_generator.py b/arch/tools/cli/config_generator.py
index 293ffc8a..c32dae16 100644
--- a/arch/tools/cli/config_generator.py
+++ b/arch/tools/cli/config_generator.py
@@ -49,7 +49,9 @@ def validate_and_render_schema():
 
     if "prompt_targets" in config_yaml:
         for prompt_target in config_yaml["prompt_targets"]:
-            name = prompt_target.get("endpoint", {}).get("name", "")
+            name = prompt_target.get("endpoint", {}).get("name", None)
+            if not name:
+                continue
             if name not in inferred_clusters:
                 inferred_clusters[name] = {
                     "name": name,
diff --git a/crates/common/src/configuration.rs b/crates/common/src/configuration.rs
index 543849c9..7486e3d9 100644
--- a/crates/common/src/configuration.rs
+++ b/crates/common/src/configuration.rs
@@ -179,8 +179,6 @@ impl Display for LlmProvider {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Endpoint {
     pub endpoint: Option<String>,
-    // pub connect_timeout: Option<DurationString>,
-    // pub timeout: Option<DurationString>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -193,6 +191,7 @@ pub struct Parameter {
     #[serde(rename = "enum")]
     pub enum_values: Option<Vec<String>>,
     pub default: Option<String>,
+    pub in_path: Option<bool>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -201,11 +200,31 @@ pub struct EndpointDetails {
     pub path: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash, Default)]
+pub enum HttpMethod {
+    #[serde(rename = "GET")]
+    Get,
+    #[default]
+    #[serde(rename = "POST")]
+    Post,
+}
+
+impl Display for HttpMethod {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            HttpMethod::Get => write!(f, "GET"),
+            HttpMethod::Post => write!(f, "POST"),
+        }
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct PromptTarget {
     pub name: String,
     pub default: Option<bool>,
     pub description: String,
+    #[serde(rename = "http_method")]
+    pub method: Option<HttpMethod>,
     pub endpoint: Option<EndpointDetails>,
     pub parameters: Option<Vec<Parameter>>,
     pub system_prompt: Option<String>,
diff --git a/crates/common/src/lib.rs b/crates/common/src/lib.rs
index a41badf9..aa34f2fd 100644
--- a/crates/common/src/lib.rs
+++ b/crates/common/src/lib.rs
@@ -11,3 +11,4 @@ pub mod routing;
 pub mod stats;
 pub mod tokenizer;
 pub mod tracing;
+pub mod path;
diff --git a/crates/common/src/path.rs b/crates/common/src/path.rs
new file mode 100644
index 00000000..2b289c9d
--- /dev/null
+++ b/crates/common/src/path.rs
@@ -0,0 +1,82 @@
+use std::collections::HashMap;
+
+pub fn replace_params_in_path(path: &str, params: &HashMap<String, String>) -> Result<String, String> {
+    let mut result = String::new();
+    let mut in_param = false;
+    let mut current_param = String::new();
+
+    for c in path.chars() {
+        if c == '{' {
+            in_param = true;
+        } else if c == '}' {
+            in_param = false;
+            let param_name = current_param.clone();
+            if let Some(value) = params.get(&param_name) {
+                result.push_str(value);
+            } else {
+                return Err(format!("Missing value for parameter `{}`", param_name));
+            }
+            current_param.clear();
+        } else {
+            if in_param {
+                current_param.push(c);
+            } else {
+                result.push(c);
+            }
+        }
+    }
+
+    Ok(result)
+}
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn test_replace_path() {
+        let path = "/cluster.open-cluster-management.io/v1/managedclusters/{cluster_name}";
+        let params = vec![("cluster_name".to_string(), "test1".to_string())]
+            .into_iter()
+            .collect();
+        assert_eq!(
+            super::replace_params_in_path(path, &params),
+            Ok("/cluster.open-cluster-management.io/v1/managedclusters/test1".to_string())
+        );
+
+        let path = "/cluster.open-cluster-management.io/v1/managedclusters";
+        let params = vec![].into_iter().collect();
+        assert_eq!(
+            super::replace_params_in_path(path, &params),
+            Ok("/cluster.open-cluster-management.io/v1/managedclusters".to_string())
+        );
+
+        let path = "/foo/{bar}/baz";
+        let params = vec![("bar".to_string(), "qux".to_string())]
+            .into_iter()
+            .collect();
+        assert_eq!(
+            super::replace_params_in_path(path, &params),
+            Ok("/foo/qux/baz".to_string())
+        );
+
+        let path = "/foo/{bar}/baz/{qux}";
+        let params = vec![
+            ("bar".to_string(), "qux".to_string()),
+            ("qux".to_string(), "quux".to_string()),
+        ]
+        .into_iter()
+        .collect();
+        assert_eq!(
+            super::replace_params_in_path(path, &params),
+            Ok("/foo/qux/baz/quux".to_string())
+        );
+
+        let path = "/foo/{bar}/baz/{qux}";
+        let params = vec![("bar".to_string(), "qux".to_string())]
+            .into_iter()
+            .collect();
+        assert_eq!(
+            super::replace_params_in_path(path, &params),
+            Err("Missing value for parameter `qux`".to_string())
+        );
+    }
+}
diff --git a/crates/prompt_gateway/src/stream_context.rs b/crates/prompt_gateway/src/stream_context.rs
index 6df5a4d1..e134e07c 100644
--- a/crates/prompt_gateway/src/stream_context.rs
+++ b/crates/prompt_gateway/src/stream_context.rs
@@ -29,6 +29,7 @@ use derivative::Derivative;
 use http::StatusCode;
 use log::{debug, info, trace, warn};
 use proxy_wasm::traits::*;
+use serde_yaml::Value;
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::rc::Rc;
@@ -892,9 +893,37 @@ impl StreamContext {
         let endpoint = prompt_target.endpoint.unwrap();
         let path: String = endpoint.path.unwrap_or(String::from("/"));
 
+        // only add params that are of string, number and bool type
+        let url_params = tool_params
+            .iter()
+            .filter(|(_, value)| value.is_number() || value.is_string() || value.is_bool())
+            .map(|(key, value)| match value {
+                Value::Number(n) => (key.clone(), n.to_string()),
+                Value::String(s) => (key.clone(), s.clone()),
+                Value::Bool(b) => (key.clone(), b.to_string()),
+                Value::Null => todo!(),
+                Value::Sequence(_) => todo!(),
+                Value::Mapping(_) => todo!(),
+                Value::Tagged(_) => todo!(),
+            })
+            .collect::<HashMap<String, String>>();
+
+        let path = match common::path::replace_params_in_path(&path, &url_params) {
+            Ok(path) => path,
+            Err(e) => {
+                return self.send_server_error(
+                    ServerError::BadRequest {
+                        why: format!("error replacing params in path: {}", e),
+                    },
+                    Some(StatusCode::BAD_REQUEST),
+                );
+            }
+        };
+
+        let http_method = prompt_target.method.unwrap_or_default().to_string();
         let mut headers = vec![
             (ARCH_UPSTREAM_HOST_HEADER, endpoint.name.as_str()),
-            (":method", "POST"),
+            (":method", &http_method),
             (":path", &path),
             (":authority", endpoint.name.as_str()),
             ("content-type", "application/json"),
diff --git a/model_server/app/main.py b/model_server/app/main.py
index 43be1f74..4f9337bd 100644
--- a/model_server/app/main.py
+++ b/model_server/app/main.py
@@ -220,6 +220,12 @@ async def hallucination(req: HallucinationRequest, res: Response):
     if "messages" in req.parameters:
         req.parameters.pop("messages")
 
+    if not req.parameters or len(req.parameters) == 0:
+        return {
+            "params_scores": {},
+            "model": req.model,
+        }
+
     candidate_labels = {f"{k} is {v}": k for k, v in req.parameters.items()}
 
     predictions = classifier(