diff --git a/POC-TO-MVP-PLAN.md b/POC-TO-MVP-PLAN.md
index 0fb5d19f9..6757a6706 100644
--- a/POC-TO-MVP-PLAN.md
+++ b/POC-TO-MVP-PLAN.md
@@ -253,17 +253,17 @@ Status:
 - Relay config pass-through exists for Hermes profiles.
 - Native harness outputs are preserved separately from Relay outputs.
 - SDK, CLI, and Harbor-facing paths expose ArtifactManifest data.
+- Relay artifact discovery is hardened for ATOF/ATIF outputs when telemetry is
+  enabled.
+- Relay-enabled profiles have tests for inspectable telemetry outputs or clear
+  telemetry references.
+- ArtifactManifest remains populated with output, logs, patch/status, native
+  harness artifacts, and telemetry references where available.
 
 Next steps:
 
-- Harden Relay artifact discovery for ATOF/ATIF outputs when telemetry is
-  enabled.
-- Add tests that verify Relay-enabled profiles produce inspectable telemetry
-  outputs or clear telemetry references.
 - Add tests that verify Relay-disabled profiles still produce native output,
   harness events where available, and logs.
-- Keep ArtifactManifest populated with output, logs, patch/status, native
-  harness artifacts, and telemetry references where available.
 - Confirm these artifacts are visible through SDK, CLI, and Harbor consumers.
 
 ### 6. Consumer Proof: Harbor
diff --git a/crates/fabric-core/src/runtime.rs b/crates/fabric-core/src/runtime.rs
index b18b2e0cb..347c0292c 100644
--- a/crates/fabric-core/src/runtime.rs
+++ b/crates/fabric-core/src/runtime.rs
@@ -751,6 +751,9 @@ fn run_process_adapter(
         None
     };
 
+    let parsed_output = parse_stdout_output(&stdout);
+    promote_relay_artifacts_to_manifest(&parsed_output, &mut artifacts);
+
     Ok(RunResult {
         agent_name: plan.agent_name.clone(),
         profile: plan.profile.clone(),
@@ -761,7 +764,7 @@ fn run_process_adapter(
         invocation_id: invocation.invocation_id,
         request_id: request.request_id,
         status,
-        output: parse_stdout_output(&stdout),
+        output: parsed_output,
         error,
         artifacts,
         telemetry: telemetry_ref(plan, relay_config.as_ref()),
@@ -959,6 +962,9 @@ fn run_python_adapter(
         None
     };
 
+    let parsed_output = parse_stdout_output(&stdout);
+    promote_relay_artifacts_to_manifest(&parsed_output, &mut artifacts);
+
     Ok(RunResult {
         agent_name: plan.agent_name.clone(),
         profile: plan.profile.clone(),
@@ -969,7 +975,7 @@ fn run_python_adapter(
         invocation_id: invocation.invocation_id,
         request_id: request.request_id,
         status,
-        output: parse_stdout_output(&stdout),
+        output: parsed_output,
         error,
         artifacts,
         telemetry: telemetry_ref(plan, relay_config.as_ref()),
@@ -1190,6 +1196,97 @@ fn parse_stdout_output(stdout: &str) -> Value {
     serde_json::from_str(stdout).unwrap_or_else(|_| Value::String(stdout.to_string()))
 }
 
+#[derive(Debug, Default, Deserialize)]
+struct RelayArtifactOutput {
+    #[serde(default)]
+    relay_artifacts: Vec<Value>,
+}
+
+#[derive(Debug, Deserialize)]
+struct RelayArtifactCandidate {
+    kind: String,
+    path: PathBuf,
+}
+
+fn promote_relay_artifacts_to_manifest(output: &Value, manifest: &mut ArtifactManifest) {
+    let relay_output: RelayArtifactOutput =
+        serde_json::from_value(output.clone()).unwrap_or_default();
+
+    for artifact in relay_output.relay_artifacts {
+        let Ok(artifact) = serde_json::from_value::<RelayArtifactCandidate>(artifact) else {
+            continue;
+        };
+        let kind = artifact.kind.as_str();
+        if !matches!(kind, "atof" | "atif") {
+            continue;
+        }
+        if artifact.path.as_os_str().is_empty() {
+            continue;
+        }
+
+        let path = resolve_relay_artifact_path(manifest, &artifact.path);
+        if !path.exists()
+            || manifest
+                .artifacts
+                .iter()
+                .any(|artifact| artifact.path == path)
+        {
+            continue;
+        }
+
+        let name = unique_relay_artifact_name(manifest, kind);
+        manifest.artifacts.push(ArtifactRef {
+            name,
+            kind: kind.to_string(),
+            path,
+            media_type: relay_artifact_media_type(kind).map(str::to_string),
+        });
+    }
+}
+
+fn resolve_relay_artifact_path(manifest: &ArtifactManifest, path: &Path) -> PathBuf {
+    if path.is_absolute() {
+        return path.to_path_buf();
+    }
+    manifest
+        .root
+        .as_ref()
+        .map(|root| root.join(path))
+        .unwrap_or_else(|| path.to_path_buf())
+}
+
+fn relay_artifact_media_type(kind: &str) -> Option<&'static str> {
+    match kind {
+        "atof" => Some("application/x-ndjson"),
+        "atif" => Some("application/json"),
+        _ => None,
+    }
+}
+
+fn unique_relay_artifact_name(manifest: &ArtifactManifest, kind: &str) -> String {
+    let base = format!("relay_{kind}");
+    if !manifest
+        .artifacts
+        .iter()
+        .any(|artifact| artifact.name == base)
+    {
+        return base;
+    }
+
+    let mut index = 2;
+    loop {
+        let candidate = format!("{base}_{index}");
+        if !manifest
+            .artifacts
+            .iter()
+            .any(|artifact| artifact.name == candidate)
+        {
+            return candidate;
+        }
+        index += 1;
+    }
+}
+
 fn process_command_args(plan: &RunPlan, settings: &ProcessAdapterSettings) -> Vec<String> {
     let mut args = Vec::new();
     if let Some(script) = settings.script.as_ref() {
@@ -1712,6 +1809,103 @@ environment:
         let _ = fs::remove_dir_all(root);
     }
 
+    #[test]
+    fn run_promotes_relay_artifacts_into_artifact_manifest() {
+        let root = std::env::temp_dir().join(format!(
+            "fabric-relay-artifact-manifest-test-{}",
+            std::process::id()
+        ));
+        let _ = fs::remove_dir_all(&root);
+        fs::create_dir_all(root.join("adapters/process")).expect("create adapters dir");
+        let adapter_script = r#"
+from pathlib import Path
+import json
+relay_dir = Path("artifacts/relay").resolve()
+relay_dir.mkdir(parents=True, exist_ok=True)
+atof = relay_dir / "events.atof.jsonl"
+atif = relay_dir / "trajectory-runtime.atif.json"
+atif_extra = relay_dir / "trajectory-child.atif.json"
+atof.write_text('{"kind":"scope"}\n', encoding="utf-8")
+atif.write_text('{"trajectory":true}', encoding="utf-8")
+atif_extra.write_text('{"trajectory":"child"}', encoding="utf-8")
+print(json.dumps({
+    "response": "ok",
+    "relay_artifacts": [
+        {"kind": "atof", "path": str(atof)},
+        {"kind": "atif", "path": str(atif)},
+        {"kind": "atif", "path": str(atif_extra)}
+    ]
+}))
+"#;
+        let agent_config = serde_json::json!({
+            "schema_version": "fabric.agent/v1alpha1",
+            "metadata": {
+                "name": "relay-artifact-test-agent",
+            },
+            "harness": {
+                "adapter_id": "acme.fabric.process",
+                "settings": {
+                    "command": "python3",
+                    "args": ["-c", adapter_script],
+                },
+            },
+            "models": {
+                "default": {
+                    "provider": "test",
+                    "model": "test-model",
+                },
+            },
+            "runtime": {
+                "mode": "oneshot",
+                "transport": "cli",
+                "input_schema": "text",
+                "output_schema": "text",
+                "artifacts": "./artifacts",
+            },
+        });
+        fs::write(
+            root.join("agent.yaml"),
+            serde_yaml::to_string(&agent_config).expect("serialize agent config"),
+        )
+        .expect("write config");
+        fs::write(
+            root.join("adapters/process/fabric-adapter.json"),
+            process_adapter_descriptor(),
+        )
+        .expect("write adapter descriptor");
+
+        let plan = resolve_run_plan(&root, None).expect("run plan");
+        let result = run_plan(&plan, RunRequest::text("collect relay")).expect("run result");
+
+        assert_eq!(result.status, RunStatus::Succeeded);
+        let atof = result
+            .artifacts
+            .artifacts
+            .iter()
+            .find(|artifact| artifact.name == "relay_atof" && artifact.kind == "atof")
+            .expect("ATOF artifact promoted to manifest");
+        let atif = result
+            .artifacts
+            .artifacts
+            .iter()
+            .find(|artifact| artifact.name == "relay_atif" && artifact.kind == "atif")
+            .expect("ATIF artifact promoted to manifest");
+        let atif_extra = result
+            .artifacts
+            .artifacts
+            .iter()
+            .find(|artifact| artifact.name == "relay_atif_2" && artifact.kind == "atif")
+            .expect("second ATIF artifact promoted to manifest with unique name");
+        assert!(atof.path.ends_with("events.atof.jsonl"));
+        assert_eq!(atof.media_type.as_deref(), Some("application/x-ndjson"));
+        assert!(atif.path.ends_with("trajectory-runtime.atif.json"));
+        assert_eq!(atif.media_type.as_deref(), Some("application/json"));
+        assert!(atif_extra.path.ends_with("trajectory-child.atif.json"));
+        assert_eq!(atif_extra.media_type.as_deref(), Some("application/json"));
+
+        let _ = fs::remove_dir_all(root);
+    }
+
     #[test]
     fn process_adapter_failure_returns_structured_error() {
         let root = std::env::temp_dir().join(format!(
diff --git a/tests/smoke_relay_integration.py b/tests/smoke_relay_integration.py
index 64ed8cba1..56a262c63 100644
--- a/tests/smoke_relay_integration.py
+++ b/tests/smoke_relay_integration.py
@@ -64,6 +64,12 @@ def main() -> None:
         relay_artifacts = result["output"]["relay_artifacts"]
         kinds = {artifact["kind"] for artifact in relay_artifacts}
         assert {"atof", "atif"} <= kinds
+        manifest_relay_kinds = {
+            artifact["kind"]
+            for artifact in result["artifacts"]["artifacts"]
+            if artifact["name"].startswith("relay_")
+        }
+        assert {"atof", "atif"} <= manifest_relay_kinds
 
         atof_paths = [Path(artifact["path"]) for artifact in relay_artifacts if artifact["kind"] == "atof"]
         atif_paths = [Path(artifact["path"]) for artifact in relay_artifacts if artifact["kind"] == "atif"]