diff --git a/packages/kernel/src/__tests__/adapter-manifest-coverage.test.ts b/packages/kernel/src/__tests__/adapter-manifest-coverage.test.ts
new file mode 100644
index 000000000..cf121308e
--- /dev/null
+++ b/packages/kernel/src/__tests__/adapter-manifest-coverage.test.ts
@@ -0,0 +1,26 @@
+/**
+ * Every machine adapter the kernel can build has a default evidence-emitter
+ * manifest in @pcc/spec. Without one, auto-onboarding writes free-text tier-0
+ * evidence for the device and the provenance planner sees it supply nothing,
+ * which is how the liquid handlers were capped at tier 0.
+ */
+
+import { describe, it, expect } from "vitest";
+import { ADAPTER_DEFAULT_MANIFESTS } from "@pcc/spec";
+import { listRegisteredMachineAdapters } from "../adapter-factory.js";
+
+describe("adapter default manifests cover the kernel's machine adapters", () => {
+  it("has a default manifest for every registered machine adapter", () => {
+    const registered = listRegisteredMachineAdapters();
+    expect(registered.length).toBeGreaterThan(0);
+    const missing = registered.filter((type) => !(type in ADAPTER_DEFAULT_MANIFESTS));
+    expect(missing).toEqual([]);
+  });
+
+  it("includes the liquid handlers", () => {
+    for (const type of ["opentrons", "hamilton"]) {
+      expect(listRegisteredMachineAdapters()).toContain(type);
+      expect(ADAPTER_DEFAULT_MANIFESTS[type]?.subject).toEqual({ kind: "adapter", ref: type });
+    }
+  });
+});
diff --git a/packages/spec/src/__tests__/emitter-manifest.test.ts b/packages/spec/src/__tests__/emitter-manifest.test.ts
index 265a9c7d2..0e0361285 100644
--- a/packages/spec/src/__tests__/emitter-manifest.test.ts
+++ b/packages/spec/src/__tests__/emitter-manifest.test.ts
@@ -136,7 +136,7 @@ describe("buildEvidenceTiersFromEmits — the digital-receipt core is tier-1 eli
 
 describe("adapter default manifests", () => {
   it("ships a manifest for every kernel adapter family", () => {
-    for (const t of ["octoprint", "ipp", "opcua", "sila", "modbus", "generic-http", "mock"]) {
+    for (const t of ["octoprint", "ipp", "opcua", "sila", "modbus", "opentrons", "hamilton", "generic-http", "mock"]) {
       expect(getAdapterManifest(t)).toBeDefined();
       expect(EvidenceEmitterManifestSchema.safeParse(getAdapterManifest(t)).success).toBe(true);
     }
@@ -152,7 +152,7 @@ describe("adapter default manifests", () => {
   });
 
   it("every digital adapter is eligible-by-default at tier 1", () => {
-    for (const t of ["octoprint", "ipp", "opcua", "sila", "modbus", "generic-http"]) {
+    for (const t of ["octoprint", "ipp", "opcua", "sila", "modbus", "hamilton", "generic-http"]) {
       const { evidence, structured } = buildAdapterEvidence(t);
       expect(structured).toBe(true);
       const report = computeCsdEligibility({ url: `pcc://adapter/${t}`, evidence });
@@ -173,6 +173,14 @@ describe("adapter default manifests", () => {
     expect(computeCsdEligibility({ url: "pcc://cam", evidence }).eligibleTier).toBe(1);
   });
 
+  it("opentrons claims only the tier-0 floor until its events map to the vocabulary", () => {
+    // Its real run path emits protocol_uploaded / run_action / run_* and no
+    // real completion event (evidence review of #418).
+    const { evidence, structured } = buildAdapterEvidence("opentrons");
+    expect(structured).toBe(true);
+    expect(computeCsdEligibility({ url: "pcc://opentrons", evidence }).eligibleTier).toBe(0);
+  });
+
   it("mock is honestly capped at tier 0 (cannot attest a real execution)", () => {
     const { evidence } = buildAdapterEvidence("mock");
     expect(computeCsdEligibility({ url: "pcc://mock", evidence }).eligibleTier).toBe(0);
diff --git a/packages/spec/src/evidence/adapter-manifests.ts b/packages/spec/src/evidence/adapter-manifests.ts
index a12116497..e1d94c5bb 100644
--- a/packages/spec/src/evidence/adapter-manifests.ts
+++ b/packages/spec/src/evidence/adapter-manifests.ts
@@ -1,9 +1,11 @@
 /**
  * Adapter + device-role DEFAULT emitter manifests — the supply-side DATA.
  *
- * One entry per adapter family present in packages/kernel/src/adapters/
- * (octoprint / ipp / opcua / sila / modbus / generic-http / mock) and per
- * evidence-only device ROLE (camera / sensor). Each declares, in the bounded
+ * One entry per machine adapter the kernel's factory registers
+ * (packages/kernel/src/adapter-factory.ts: octoprint / ipp / opcua / sila /
+ * modbus / opentrons / hamilton / generic-http / mock; a kernel test keeps the
+ * two in step) and per evidence-only device ROLE (camera / sensor).
+ * PyLabRobot is not a kernel AdapterType, so it has no entry here. Each declares, in the bounded
  * vocabulary, which primitives that adapter/role can EMIT. Auto-discovery reads
  * these to write structured `evidence.tierN.primitives[]` instead of free-text
  * `required[]`, turning an onboarded device from tier-0-capped into
@@ -91,6 +93,21 @@ export const ADAPTER_DEFAULT_MANIFESTS: Readonly<Record<string, EvidenceEmitterM
   // PLC / fieldbus via Modbus.
   modbus: adapterManifest("modbus", [...DIGITAL_RECEIPT_CORE]),
 
+  // Liquid handlers (evidence review of #418, #3251). Neither adapter feeds
+  // LogCaptureService (only printer-log-adapter does), so no
+  // machine.execution_log, and neither emits telemetry.
+  //   - hamilton (kernel/src/adapters/hamilton-adapter.ts): real runs emit the
+  //     vocabulary's execution_started / execution_completed /
+  //     execution_failed, inside the kernel job pipeline whose EvidenceEmitter
+  //     signs each job-step bundle and marks mock/simulated events fabricated
+  //     (kernel/src/evidence-emitter.ts). It carries the receipt core.
+  //   - opentrons (kernel/src/opentrons/adapter.ts): real runs emit only
+  //     non-vocabulary types (protocol_uploaded, run_action, run_*) and no
+  //     real completion event, so it claims the tier-0 floor only, until its
+  //     events are mapped to the vocabulary (evidence offered the mapping).
+  hamilton: adapterManifest("hamilton", [...DIGITAL_RECEIPT_CORE]),
+  opentrons: adapterManifest("opentrons", [{ id: "decl.self_attested" }]),
+
   // Arbitrary external HTTP capability. Adds target-system confirmation via the
   // upstream's own channel (api) — a natural fit for HTTP-backed work.
   "generic-http": adapterManifest("generic-http", [