diff --git a/showcase/scripts/__tests__/fixtures/railway-envs.golden.json b/showcase/scripts/__tests__/fixtures/railway-envs.golden.json
index dbb1ea7507..f248c0e44c 100644
--- a/showcase/scripts/__tests__/fixtures/railway-envs.golden.json
+++ b/showcase/scripts/__tests__/fixtures/railway-envs.golden.json
@@ -95,6 +95,15 @@
       "repoName": "showcase-harness"
     }
   },
+  "harness-workers": {
+    "staging": {
+      "instanceId": "362c1e37-5f40-45f2-ac7b-0e5adac565f8",
+      "domain": null,
+      "probe": false,
+      "driver": "harness",
+      "repoName": "showcase-harness"
+    }
+  },
   "pocketbase": {
     "prod": {
       "instanceId": "1ee376e2-13f2-4464-801e-d0aa0bf76532",
@@ -239,15 +248,6 @@
       "repoName": "showcase-google-adk"
     }
   },
-  "showcase-harness-worker": {
-    "staging": {
-      "instanceId": "362c1e37-5f40-45f2-ac7b-0e5adac565f8",
-      "domain": null,
-      "probe": false,
-      "driver": "harness",
-      "repoName": "showcase-harness"
-    }
-  },
   "showcase-langgraph-fastapi": {
     "prod": {
       "instanceId": "105b7e01-acd0-48e2-9a09-541e2103e8d2",
diff --git a/showcase/scripts/__tests__/railway-envs.golden.test.ts b/showcase/scripts/__tests__/railway-envs.golden.test.ts
index 50761e5c7e..bdbbe631fc 100644
--- a/showcase/scripts/__tests__/railway-envs.golden.test.ts
+++ b/showcase/scripts/__tests__/railway-envs.golden.test.ts
@@ -22,12 +22,12 @@
  * placeholder/borrowed values it removes (visible as the only diff to this
  * fixture in the refactor commit):
  *
- *   1. `showcase-harness-worker.prod` — DROPPED. The old schema required a
+ *   1. `harness-workers.prod` — DROPPED. The old schema required a
  *      distinct prod UUID per entry, so the worker (a staging-only service)
  *      carried its own serviceId mirrored as a non-functional prod
  *      placeholder that was never dereferenced. The env-map schema simply
  *      omits the prod env.
- *   2. `showcase-harness-worker.staging`, `harness-legacy.{prod,staging}`
+ *   2. `harness-workers.staging`, `harness-legacy.{prod,staging}`
  *      `domain` — null (was a BORROWED control-plane host). These three
  *      envs are domainless workers with `probe:false`, so `domainFor` is
  *      never called for them at runtime; the old schema's `domains{}`
@@ -96,7 +96,7 @@ function buildSnapshot(): Record<
     // NOT a hardcoded ["prod","staging"]. This is what proves the refactor
     // preserved resolution for every REAL (service, env) pair while
     // dropping the old schema's non-functional placeholder env entries
-    // (e.g. showcase-harness-worker's mirrored prod instanceId).
+    // (e.g. harness-workers's mirrored prod instanceId).
     for (const env of envsFor(name)) {
       out[name][env] = resolveServiceEnv(name, env);
     }
diff --git a/showcase/scripts/__tests__/verify-railway-image-refs.test.ts b/showcase/scripts/__tests__/verify-railway-image-refs.test.ts
index 97e326d336..ba80829990 100644
--- a/showcase/scripts/__tests__/verify-railway-image-refs.test.ts
+++ b/showcase/scripts/__tests__/verify-railway-image-refs.test.ts
@@ -23,12 +23,12 @@ describe("ServiceEntry gateIgnore field", () => {
   it("is optional on the type and defaults to falsy when unset", () => {
     // Every real SSOT entry has gateIgnore unset (undefined / falsy),
     // EXCEPT two deliberately gateIgnore:true entries: the staging-only
-    // `showcase-harness-worker` pool-fleet worker (no public domain, does not
+    // `harness-workers` pool-fleet worker (no public domain, does not
     // fit the symmetric dual-env shape the gate validates) and the interim
     // `harness-legacy` fleet-migration bridge (runs a pinned out-of-band
     // digest, not the canonical :latest/@sha256 shape). See their SSOT
     // entries in railway-envs.ts for the rationale.
-    const GATE_IGNORED = new Set(["showcase-harness-worker", "harness-legacy"]);
+    const GATE_IGNORED = new Set(["harness-workers", "harness-legacy"]);
     for (const [name, entry] of Object.entries(SERVICES)) {
       const gi = (entry as ServiceEntry).gateIgnore;
       if (GATE_IGNORED.has(name)) {
@@ -246,11 +246,11 @@ describe("WS-C: all gate-managed services gateValidated, with correct overrides"
 
   it("marks every gate-managed service gateValidated (no Phase-2 holdouts)", () => {
     // Two intentional gateValidated:false entries: the staging-only
-    // `showcase-harness-worker` (gateIgnore:true — no public domain) and the
+    // `harness-workers` (gateIgnore:true — no public domain) and the
     // interim `harness-legacy` fleet-migration bridge (gateIgnore:true — runs
     // a pinned out-of-band digest). Every OTHER service must be
     // gateValidated:true.
-    const GATE_IGNORED = new Set(["showcase-harness-worker", "harness-legacy"]);
+    const GATE_IGNORED = new Set(["harness-workers", "harness-legacy"]);
     const unvalidated = Object.entries(SERVICES)
       .filter(
         ([name, entry]) => !entry.gateValidated && !GATE_IGNORED.has(name),
diff --git a/showcase/scripts/railway-envs.generated.json b/showcase/scripts/railway-envs.generated.json
index 96aa2fb259..743913a5c3 100644
--- a/showcase/scripts/railway-envs.generated.json
+++ b/showcase/scripts/railway-envs.generated.json
@@ -136,6 +136,27 @@
         "driver": "harness"
       }
     },
+    {
+      "name": "harness-workers",
+      "serviceId": "c2aa8a0b-350e-4b76-8541-3012dfac41d0",
+      "prodInstanceId": "c2aa8a0b-350e-4b76-8541-3012dfac41d0",
+      "stagingInstanceId": "362c1e37-5f40-45f2-ac7b-0e5adac565f8",
+      "ciBuilt": false,
+      "gateValidated": false,
+      "repoNameOverride": {
+        "prod": "showcase-harness",
+        "staging": "showcase-harness"
+      },
+      "domains": {
+        "staging": "harness-staging-2ee4.up.railway.app",
+        "prod": "showcase-harness-production.up.railway.app"
+      },
+      "probe": {
+        "staging": false,
+        "prod": false,
+        "driver": "harness"
+      }
+    },
     {
       "name": "pocketbase",
       "serviceId": "ba11e854-d695-4738-9a45-2b0776788824",
@@ -306,27 +327,6 @@
         "driver": "agent"
       }
     },
-    {
-      "name": "showcase-harness-worker",
-      "serviceId": "c2aa8a0b-350e-4b76-8541-3012dfac41d0",
-      "prodInstanceId": "c2aa8a0b-350e-4b76-8541-3012dfac41d0",
-      "stagingInstanceId": "362c1e37-5f40-45f2-ac7b-0e5adac565f8",
-      "ciBuilt": false,
-      "gateValidated": false,
-      "repoNameOverride": {
-        "prod": "showcase-harness",
-        "staging": "showcase-harness"
-      },
-      "domains": {
-        "staging": "harness-staging-2ee4.up.railway.app",
-        "prod": "showcase-harness-production.up.railway.app"
-      },
-      "probe": {
-        "staging": false,
-        "prod": false,
-        "driver": "harness"
-      }
-    },
     {
       "name": "showcase-langgraph-fastapi",
       "serviceId": "06cccb5c-59f4-46b5-8adc-7113e77011a4",
diff --git a/showcase/scripts/railway-envs.test.ts b/showcase/scripts/railway-envs.test.ts
index d82e8df33e..dee0a8b99e 100644
--- a/showcase/scripts/railway-envs.test.ts
+++ b/showcase/scripts/railway-envs.test.ts
@@ -452,10 +452,39 @@ describe("railway-envs SSOT — domains + probe", () => {
   it("envsFor lists exactly the envs a service declares", () => {
     // Dual-env services declare both; the staging-only worker declares one.
     expect(envsFor("aimock")).toEqual(["prod", "staging"]);
-    expect(envsFor("showcase-harness-worker")).toEqual(["staging"]);
+    expect(envsFor("harness-workers")).toEqual(["staging"]);
     expect(envsFor("harness-legacy")).toEqual(["prod", "staging"]);
   });
 
+  it("harness-workers is a staging-only, domainless, probe-disabled worker", () => {
+    // The pool-fleet worker is the canonical single-env / domainless shape
+    // the env-map schema enables (the old schema forced a placeholder prod
+    // instanceId + a borrowed control-plane domain). Pin every facet:
+    const worker = SERVICES["harness-workers"];
+    // Staging-only: no prod env at all (no placeholder).
+    expect(worker.environments.prod).toBeUndefined();
+    expect(worker.environments.staging).toBeDefined();
+    // Domainless: the staging env omits a public host entirely (it is a
+    // queue consumer, not HTTP-exposed). domainFor MUST throw rather than
+    // return a borrowed host.
+    expect(worker.environments.staging.domain).toBeUndefined();
+    expect(() => domainFor("harness-workers", "staging")).toThrow(
+      /malformed\/missing staging domain/,
+    );
+    // Probe disabled (covered by the control-plane harness probe + the
+    // Railway-internal healthcheck).
+    expect(probeEnabled("harness-workers", "staging")).toBe(false);
+    // Runs the shared showcase-harness image; not separately CI-built; kept
+    // out of both gate directions via gateIgnore.
+    expect(worker.environments.staging.repoName).toBe("showcase-harness");
+    expect(worker.ciBuilt).toBe(false);
+    expect(worker.gateIgnore).toBe(true);
+    expect(worker.serviceId).toBe("c2aa8a0b-350e-4b76-8541-3012dfac41d0");
+    expect(worker.environments.staging.instanceId).toBe(
+      "362c1e37-5f40-45f2-ac7b-0e5adac565f8",
+    );
+  });
+
   it("domainFor returns the no-scheme host for known service+env", () => {
     expect(domainFor("docs", "staging")).toBe("docs.staging.copilotkit.ai");
     expect(domainFor("docs", "prod")).toBe("docs.copilotkit.ai");
diff --git a/showcase/scripts/railway-envs.ts b/showcase/scripts/railway-envs.ts
index 404f9b41b2..d964217c72 100644
--- a/showcase/scripts/railway-envs.ts
+++ b/showcase/scripts/railway-envs.ts
@@ -340,7 +340,11 @@ export const SERVICES: Record<
       },
     },
   },
-  "showcase-harness-worker": {
+  // SSOT key MUST equal the EXACT Railway service name. The Railway service
+  // is `harness-workers` (PLURAL) — the image-ref gate matches SSOT keys to
+  // Railway service names verbatim, so the key here is `harness-workers`,
+  // not `showcase-harness-worker`.
+  "harness-workers": {
     serviceId: "c2aa8a0b-350e-4b76-8541-3012dfac41d0",
     // STAGING-ONLY worker (pool-fleet cutover). There is no prod
     // serviceInstance — the pool-fleet runs in staging only for now. Under
@@ -365,7 +369,7 @@ export const SERVICES: Record<
     // existing `harness` (control-plane) service runs — it is NOT a
     // separately-built image. The single `showcase-harness` build slot in
     // showcase_build.yml produces the image both services consume; there is
-    // no `showcase-harness-worker` build slot. Hence ciBuilt:false. The
+    // no `harness-workers` build slot. Hence ciBuilt:false. The
     // repoName override points at `showcase-harness` so the image-ref shape
     // resolves correctly if the gate ever validates it.
     //
@@ -411,7 +415,7 @@ export const SERVICES: Record<
     // gateIgnore: deliberately-untracked for the image-ref gate. This
     // interim service runs a pinned digest (not the canonical :latest /
     // @sha256 shape the gate enforces) and is short-lived. Mirrors
-    // showcase-harness-worker exactly (minus the worker's single-env shape —
+    // harness-workers exactly (minus the worker's single-env shape —
     // harness-legacy DOES exist in both envs).
     gateValidated: false,
     gateIgnore: true,