diff --git a/senses/git-workspace-status/index.js b/senses/git-workspace-status/index.js
index a5732c7..5a90a3d 100644
--- a/senses/git-workspace-status/index.js
+++ b/senses/git-workspace-status/index.js
@@ -55,16 +55,7 @@ async function compute() {
     const inside = runGit(root, ["rev-parse", "--is-inside-work-tree"]).trim();
     if (inside !== "true") {
       gitError = "not a git work tree";
-      return {
-        ts,
-        branch,
-        headShort,
-        porcelainLines,
-        hasUpstream,
-        aheadCount,
-        behindCount,
-        gitError
-      };
+      return { signal: { ts, branch, headShort, porcelainLines, hasUpstream, aheadCount, behindCount, gitError }, workflow: null };
     }
     branch = runGit(root, ["rev-parse", "--abbrev-ref", "HEAD"]);
     headShort = runGit(root, ["rev-parse", "--short", "HEAD"]);
@@ -86,16 +77,7 @@ async function compute() {
   } catch (e) {
     gitError = gitErrorMessage(e);
   }
-  return {
-    ts,
-    branch,
-    headShort,
-    porcelainLines,
-    hasUpstream,
-    aheadCount,
-    behindCount,
-    gitError
-  };
+  return { signal: { ts, branch, headShort, porcelainLines, hasUpstream, aheadCount, behindCount, gitError }, workflow: null };
 }
 export {
   compute,
diff --git a/senses/git-workspace-status/src/index.ts b/senses/git-workspace-status/src/index.ts
index 16bb0c1..27901c0 100644
--- a/senses/git-workspace-status/src/index.ts
+++ b/senses/git-workspace-status/src/index.ts
@@ -47,16 +47,7 @@ export async function compute() {
     const inside = runGit(root, ["rev-parse", "--is-inside-work-tree"]).trim();
     if (inside !== "true") {
       gitError = "not a git work tree";
-      return {
-        ts,
-        branch,
-        headShort,
-        porcelainLines,
-        hasUpstream,
-        aheadCount,
-        behindCount,
-        gitError,
-      };
+      return { signal: { ts, branch, headShort, porcelainLines, hasUpstream, aheadCount, behindCount, gitError }, workflow: null };
     }
 
     branch = runGit(root, ["rev-parse", "--abbrev-ref", "HEAD"]);
@@ -81,14 +72,5 @@ export async function compute() {
     gitError = gitErrorMessage(e);
   }
 
-  return {
-    ts,
-    branch,
-    headShort,
-    porcelainLines,
-    hasUpstream,
-    aheadCount,
-    behindCount,
-    gitError,
-  };
+  return { signal: { ts, branch, headShort, porcelainLines, hasUpstream, aheadCount, behindCount, gitError }, workflow: null };
 }
diff --git a/senses/hermes-gateway-health/index.js b/senses/hermes-gateway-health/index.js
index e87c3e5..ebd7d02 100644
--- a/senses/hermes-gateway-health/index.js
+++ b/senses/hermes-gateway-health/index.js
@@ -353,7 +353,7 @@ async function compute() {
     httpLatencyMs,
     httpError
   };
-  return row;
+  return { signal: row, workflow: null };
 }
 export {
   compute,
diff --git a/senses/hermes-gateway-health/src/index.ts b/senses/hermes-gateway-health/src/index.ts
index f23d2ca..4df345e 100644
--- a/senses/hermes-gateway-health/src/index.ts
+++ b/senses/hermes-gateway-health/src/index.ts
@@ -404,5 +404,5 @@ export async function compute() {
     httpError,
   };
 
-  return row;
+  return { signal: row, workflow: null };
 }
diff --git a/senses/hermes-session-message-stats/index.js b/senses/hermes-session-message-stats/index.js
index 916a333..325eb15 100644
--- a/senses/hermes-session-message-stats/index.js
+++ b/senses/hermes-session-message-stats/index.js
@@ -102,7 +102,7 @@ async function compute() {
     activeSessions,
     measurementWindowSeconds: MEASUREMENT_WINDOW_SECONDS
   };
-  return row;
+  return { signal: row, workflow: null };
 }
 export {
   compute,
diff --git a/senses/hermes-session-message-stats/src/index.ts b/senses/hermes-session-message-stats/src/index.ts
index a388c92..263d1bf 100644
--- a/senses/hermes-session-message-stats/src/index.ts
+++ b/senses/hermes-session-message-stats/src/index.ts
@@ -113,5 +113,5 @@ export async function compute() {
     measurementWindowSeconds: MEASUREMENT_WINDOW_SECONDS,
   };
 
-  return row;
+  return { signal: row, workflow: null };
 }
diff --git a/senses/linux-system-health/index.js b/senses/linux-system-health/index.js
index 0143ac5..8173fc0 100644
--- a/senses/linux-system-health/index.js
+++ b/senses/linux-system-health/index.js
@@ -80,7 +80,7 @@ async function compute() {
   }
   const ts = Date.now();
   const uptimeSec = Math.round(uptime());
-  return {
+  const data = {
     ts,
     cpuLoad1m: load1,
     cpuLoad5m: load5,
@@ -99,6 +99,7 @@ async function compute() {
     tcpAlloc: tcp.tcpAlloc,
     tcpMemPages: tcp.tcpMemPages
   };
+  return { signal: data, workflow: null };
 }
 export {
   compute,
diff --git a/senses/linux-system-health/src/index.ts b/senses/linux-system-health/src/index.ts
index b9bcf3e..f255505 100644
--- a/senses/linux-system-health/src/index.ts
+++ b/senses/linux-system-health/src/index.ts
@@ -72,7 +72,7 @@ export async function compute() {
   const ts = Date.now();
   const uptimeSec = Math.round(uptime());
 
-  return {
+  const data = {
     ts, cpuLoad1m: load1, cpuLoad5m: load5, cpuLoad15m: load15,
     memTotalMB, memUsedMB, memUsedPct,
     diskTotalGB, diskUsedGB, diskUsedPct,
@@ -84,4 +84,5 @@ export async function compute() {
     tcpAlloc: tcp.tcpAlloc,
     tcpMemPages: tcp.tcpMemPages,
   };
+  return { signal: data, workflow: null };
 }
diff --git a/senses/worker-process-metrics/index.js b/senses/worker-process-metrics/index.js
index d7423f1..c0f56b0 100644
--- a/senses/worker-process-metrics/index.js
+++ b/senses/worker-process-metrics/index.js
@@ -29,7 +29,7 @@ async function compute() {
     rssMB,
     externalMB
   };
-  return row;
+  return { signal: row, workflow: null };
 }
 export {
   compute,
diff --git a/senses/worker-process-metrics/src/index.ts b/senses/worker-process-metrics/src/index.ts
index e18e1d9..b584519 100644
--- a/senses/worker-process-metrics/src/index.ts
+++ b/senses/worker-process-metrics/src/index.ts
@@ -22,5 +22,5 @@ export async function compute() {
     externalMB,
   };
 
-  return row;
+  return { signal: row, workflow: null };
 }