diff --git a/adapters/codex-cli/src/nemo_fabric_adapters/codex_cli/adapter.py b/adapters/codex-cli/src/nemo_fabric_adapters/codex_cli/adapter.py
index 974e81084..0f135a5b1 100755
--- a/adapters/codex-cli/src/nemo_fabric_adapters/codex_cli/adapter.py
+++ b/adapters/codex-cli/src/nemo_fabric_adapters/codex_cli/adapter.py
@@ -689,7 +689,6 @@ def run_codex(payload: dict[str, Any]) -> dict[str, Any]:
         )
         output["relay_runtime"] = {
             "enabled": True,
-            "mode": os.environ.get("FABRIC_RELAY_MODE"),
             "config_path": os.environ.get("FABRIC_RELAY_CONFIG_PATH"),
             "emitter": "nemo-relay",
         }
diff --git a/adapters/hermes-cli/src/nemo_fabric_adapters/hermes_cli/adapter.py b/adapters/hermes-cli/src/nemo_fabric_adapters/hermes_cli/adapter.py
index 985f87df4..9cf4800fe 100755
--- a/adapters/hermes-cli/src/nemo_fabric_adapters/hermes_cli/adapter.py
+++ b/adapters/hermes-cli/src/nemo_fabric_adapters/hermes_cli/adapter.py
@@ -137,7 +137,6 @@ def run_hermes_cli(payload: dict[str, Any]) -> dict[str, Any]:
         relay_artifacts = common_utils.collect_relay_artifacts(relay_plugin_config)
         output["relay_runtime"] = {
             "enabled": True,
-            "mode": os.environ.get("FABRIC_RELAY_MODE"),
             "config_path": os.environ.get("FABRIC_RELAY_CONFIG_PATH"),
             "emitter": "hermes.observability/nemo_relay",
         }
diff --git a/adapters/hermes-sdk/src/nemo_fabric_adapters/hermes_sdk/adapter.py b/adapters/hermes-sdk/src/nemo_fabric_adapters/hermes_sdk/adapter.py
index cdc614ac1..72f291231 100755
--- a/adapters/hermes-sdk/src/nemo_fabric_adapters/hermes_sdk/adapter.py
+++ b/adapters/hermes-sdk/src/nemo_fabric_adapters/hermes_sdk/adapter.py
@@ -151,7 +151,6 @@ async def run_hermes_sdk(payload: dict[str, Any]) -> dict[str, Any]:
     if relay_plugin_config is not None:
         output["relay_runtime"] = {
             "enabled": True,
-            "mode": os.environ.get("FABRIC_RELAY_MODE"),
             "config_path": os.environ.get("FABRIC_RELAY_CONFIG_PATH"),
             "emitter": "hermes.observability/nemo_relay",
         }
diff --git a/crates/fabric-core/src/runtime.rs b/crates/fabric-core/src/runtime.rs
index f5b06f2d5..12b527426 100644
--- a/crates/fabric-core/src/runtime.rs
+++ b/crates/fabric-core/src/runtime.rs
@@ -23,7 +23,6 @@ use crate::config::{
 use crate::error::{FabricError, Result};
 
 static NEXT_ID: AtomicU64 = AtomicU64::new(1);
-const RELAY_RUNTIME_MODE: &str = "sdk";
 #[cfg(test)]
 static TEST_STOPPED_AGENTS: Mutex<Vec<String>> = Mutex::new(Vec::new());
 
@@ -1683,7 +1682,6 @@ fn prepare_relay_runtime_config(
         "schema_version": "fabric.relay/v1alpha1",
         "relay": {
             "enabled": true,
-            "mode": RELAY_RUNTIME_MODE,
             "project": telemetry.relay_project.clone(),
             "output_dir": telemetry
                 .relay_output_dir
@@ -1721,10 +1719,6 @@ fn prepare_relay_runtime_config(
         path: path.clone(),
         env: BTreeMap::from([
             ("FABRIC_RELAY_ENABLED".to_string(), "true".to_string()),
-            (
-                "FABRIC_RELAY_MODE".to_string(),
-                RELAY_RUNTIME_MODE.to_string(),
-            ),
             (
                 "FABRIC_RELAY_CONFIG_PATH".to_string(),
                 path.to_string_lossy().into_owned(),
diff --git a/tests/e2e/test_hermes_e2e.py b/tests/e2e/test_hermes_e2e.py
index b66e8c52d..062f39ca1 100644
--- a/tests/e2e/test_hermes_e2e.py
+++ b/tests/e2e/test_hermes_e2e.py
@@ -83,7 +83,6 @@ async def test_artifacts(self):
         assert output["base_url"] == f"{self.api_server}/v1"
         assert output["error"] is None
         assert output["relay_runtime"]["enabled"] is True
-        assert output["relay_runtime"]["mode"] == "sdk"
         assert output["relay_runtime"]["emitter"] == "hermes.observability/nemo_relay"        
         assert output["failed"] is False