diff --git a/packages/onboarding/src/tenant-seed.ts b/packages/onboarding/src/tenant-seed.ts
index a514c2da15..a77cff274d 100644
--- a/packages/onboarding/src/tenant-seed.ts
+++ b/packages/onboarding/src/tenant-seed.ts
@@ -282,9 +282,10 @@ export const CATALOG_WORKFLOWS: readonly DefaultWorkflow[] = [
     assetName: "workbench-digest",
     displayName: catalogDisplayName("workbench-digest"),
     automatable: catalogAutomatable("workbench-digest"),
-    buildJson: (_tenantDomain, inferencePreferences) =>
+    buildJson: (tenantDomain, inferencePreferences) =>
       serializeWorkbenchDigestWorkflow(
         buildWorkbenchDigestWorkflow({
+          triggerAddress: `workbench-digest@${tenantDomain}`,
           inferencePreferences,
           turnTimeoutMs: WORKBENCH_DIGEST_TURN_TIMEOUT_MS,
         }),
diff --git a/scripts/e2e/workbench-digest.test.ts b/scripts/e2e/workbench-digest.test.ts
index 2d2900be4a..dc38312dfa 100644
--- a/scripts/e2e/workbench-digest.test.ts
+++ b/scripts/e2e/workbench-digest.test.ts
@@ -161,6 +161,7 @@ describe.skipIf(databaseUrl === undefined)("workbench-digest workflow", () => {
       expectStatus("mint git token", minted, 201);
 
       const definition = buildWorkbenchDigestWorkflow({
+        triggerAddress: `workbench-digest@${slug}.localhost`,
         inferencePreferences: [{ provider: "anthropic", model: "noop" }],
         turnTimeoutMs: DIGEST_TURN_TIMEOUT_MS,
       });
diff --git a/workflows/credential-expiry/README.md b/workflows/credential-expiry/README.md
index 70c944e631..a6017a099e 100644
--- a/workflows/credential-expiry/README.md
+++ b/workflows/credential-expiry/README.md
@@ -1,8 +1,9 @@
 # @corbits/credential-expiry-workflow
 
-A schedule-triggered workflow that checks this tenant's credentials once
-a day and mails a reconnect notice for any credential that is `active`
-but past its own `expiresAt`. Replaces the hub-owned periodic loop
+A mail-triggered workflow that checks this tenant's credentials on each
+trigger and mails a reconnect notice for any credential that is `active`
+but past its own `expiresAt`. `@corbits/cron` delivers a tick mail once
+a day. Replaces the hub-owned periodic loop
 `apps/hub/src/credential-expiry-sweep.ts` (CL-8181): the same decision
 runs as a deployed Routine instead of inside the hub process.
 
@@ -37,6 +38,7 @@ import {
 } from "@corbits/credential-expiry-workflow";
 
 const definition = buildCredentialExpiryWorkflow({
+  triggerAddress: "ins_dep000000000000@example.test",
   inferencePreferences: [{ provider: "anthropic", model: "claude-haiku" }],
   turnTimeoutMs: 60_000,
 });
diff --git a/workflows/credential-expiry/src/index.ts b/workflows/credential-expiry/src/index.ts
index 10c281db65..be9ad7a6ad 100644
--- a/workflows/credential-expiry/src/index.ts
+++ b/workflows/credential-expiry/src/index.ts
@@ -1,12 +1,14 @@
-// The credential-expiry workflow (CL-8181): on a schedule, check this
+// The credential-expiry workflow (CL-8181): on each trigger, check this
 // tenant's credentials and mail a reconnect notice for each one that is
 // active but past its own `expiresAt`. Replaces the hub-owned periodic
 // loop `apps/hub/src/credential-expiry-sweep.ts` — that loop's own
 // decision logic now lives in `./decide.ts` (moved rather than
 // reimplemented; it needs no DB and no mail infrastructure to stay
-// correct), and this definition is deployed like any other scheduled
-// Routine instead of running inside the hub process for every tenant at
-// once.
+// correct), and this definition is deployed like any other Routine
+// instead of running inside the hub process for every tenant at once.
+// It is mail-triggered, not schedule-triggered: `@corbits/cron`
+// delivers a tick mail on the daily cadence, so this definition never
+// declares `type: "schedule"` itself (CL-8183).
 //
 // Scope narrows on the port: the old sweep also refreshed
 // `mcp:<slug>` OAuth tokens in place before ever mailing anyone
@@ -34,10 +36,6 @@ import { CREDENTIAL_EXPIRY_CHECK_TOOL_NAME } from "./tool";
 export const CREDENTIAL_EXPIRY_WORKFLOW_ID = "wf_credential_expiry";
 export const CREDENTIAL_EXPIRY_STEP_ID = "credential-expiry-check";
 
-/** Daily at 08:00 UTC — ahead of `workbench-digest`'s 09:00 slot, so a
- * reconnect notice for the day lands before the day's own digest. */
-export const CREDENTIAL_EXPIRY_SCHEDULE_CRON = "0 8 * * *";
-
 export const CREDENTIAL_EXPIRY_SYSTEM_PROMPT = [
   "You are a scheduled credential-expiry check for this workbench's " +
     "tenant. Nobody is watching this run happen — write for the tenant " +
@@ -55,10 +53,12 @@ export const CREDENTIAL_EXPIRY_SYSTEM_PROMPT = [
 
 /**
  * Everything the definition needs that is per-deployment data. The
- * schedule trigger is fixed on the definition; inference and the
- * per-turn timeout are resolved at deploy time.
+ * trigger address names a specific deployment's inbox, so a definition
+ * built here is per-deployment by construction.
  */
 export interface CredentialExpiryWorkflowInput {
+  /** The deployment's mail address; each inbound mail is one run. */
+  readonly triggerAddress: string;
   /** Provider/model preferences, in order; resolved at deploy time. */
   readonly inferencePreferences: readonly InferencePreference[];
   /** Per-turn timeout in milliseconds, enforced on the single step. */
@@ -78,6 +78,9 @@ export interface CredentialExpiryWorkflowInput {
 export function buildCredentialExpiryWorkflow(
   input: CredentialExpiryWorkflowInput,
 ): WorkflowDefinition {
+  if (input.triggerAddress === "") {
+    throw new Error("buildCredentialExpiryWorkflow requires a non-empty triggerAddress");
+  }
   if (!Number.isInteger(input.turnTimeoutMs) || input.turnTimeoutMs <= 0) {
     throw new Error(
       "buildCredentialExpiryWorkflow requires turnTimeoutMs to be a positive integer",
@@ -85,7 +88,7 @@ export function buildCredentialExpiryWorkflow(
   }
   return defineWorkflow({
     id: CREDENTIAL_EXPIRY_WORKFLOW_ID,
-    trigger: { type: "schedule", cron: CREDENTIAL_EXPIRY_SCHEDULE_CRON },
+    trigger: { type: "mail", to: input.triggerAddress },
     steps: {
       [CREDENTIAL_EXPIRY_STEP_ID]: step({
         agent: defineAgent({
diff --git a/workflows/workbench-digest/README.md b/workflows/workbench-digest/README.md
index 5238f27f73..a187dde875 100644
--- a/workflows/workbench-digest/README.md
+++ b/workflows/workbench-digest/README.md
@@ -1,19 +1,18 @@
 # @corbits/workbench-digest-workflow
 
-A single schedule-triggered step meant to be deployed against a
-workbench's own timeline address. It fires daily at 09:00 UTC
-(`0 9 * * *`) and relays a deterministic summary line straight back
-into the workbench, mirroring how a workbench host's reply becomes a
-workbench mail post (see `packages/chat/src/workbench-workflow.ts` and
-`platform-adapter.ts`).
+A single mail-triggered step meant to be deployed against a workbench's
+own timeline address. `@corbits/cron` delivers a tick mail on the
+digest's schedule (daily at 09:00 UTC), and each tick relays a
+deterministic summary line straight back into the workbench, mirroring
+how a workbench host's reply becomes a workbench mail post (see
+`packages/chat/src/workbench-workflow.ts` and `platform-adapter.ts`).
 
 ## What it does
 
 One step, one agent, a system prompt that instructs relaying the
 trigger's exact text with no additions, no commentary, no formatting of
-its own. The schedule is fixed on the definition; this package never
-computes the digest line itself, so its output is exactly as
-deterministic as its input.
+its own. This package never computes the digest line itself, so its
+output is exactly as deterministic as its input.
 
 ## Cost profile
 
@@ -25,7 +24,7 @@ constant, locally served SSE response, so running this on a tight
 schedule costs nothing. The trade-off: `noop-inference` always replies
 with empty text by design (see its header comment), so under this pin
 no visible digest line is actually posted — the run still proves the
-scheduling and workbench-mail-posting paths stay alive, just without
+mail-trigger and workbench-mail-posting paths stay alive, just without
 visible output.
 
 **Pinned to a real catalog model:** point `inferencePreferences` at any
@@ -42,6 +41,7 @@ import {
 } from "@corbits/workbench-digest-workflow";
 
 const definition = buildWorkbenchDigestWorkflow({
+  triggerAddress: "ins_dep000000000000@example.test",
   inferencePreferences: [{ provider: "anthropic", model: "noop" }],
   turnTimeoutMs: 60_000,
 });
diff --git a/workflows/workbench-digest/src/index.ts b/workflows/workbench-digest/src/index.ts
index 4e57c15ff2..f3d90b186c 100644
--- a/workflows/workbench-digest/src/index.ts
+++ b/workflows/workbench-digest/src/index.ts
@@ -4,10 +4,12 @@
 // and timestamp — back into the workbench, the same way a workbench
 // host's reply becomes a workbench mail post (see
 // `packages/chat/src/workbench-workflow.ts` and `platform-adapter.ts`'s
-// `connectorReplyContent` handling). Fired on a 09:00 UTC schedule
-// (`WORKBENCH_DIGEST_SCHEDULE_CRON`). This definition's only job is to
-// relay an already-deterministic digest line back out verbatim, so
-// nothing about the reply's content is left to the model.
+// `connectorReplyContent` handling). Fired by mail to the deployment's
+// own trigger address: `@corbits/cron` delivers a tick mail on the
+// digest's schedule, so this definition never declares `type:
+// "schedule"` itself. This definition's only job is to relay an
+// already-deterministic digest line back out verbatim, so nothing about
+// the reply's content is left to the model.
 //
 // No agent-free step primitive runs on the deployed host today (see
 // `@corbits/heartbeat-workflow`'s own header comment for why), so this
@@ -26,7 +28,6 @@ import type { WorkflowDefinition } from "@intx/workflow";
 
 export const WORKBENCH_DIGEST_WORKFLOW_ID = "wf_workbench_digest";
 export const WORKBENCH_DIGEST_STEP_ID = "workbench-digest";
-export const WORKBENCH_DIGEST_SCHEDULE_CRON = "0 9 * * *";
 
 export const WORKBENCH_DIGEST_SYSTEM_PROMPT =
   "You post a single deterministic summary line into a workbench. The " +
@@ -35,11 +36,13 @@ export const WORKBENCH_DIGEST_SYSTEM_PROMPT =
   "commentary, no formatting of your own.";
 
 /**
- * Everything the definition needs that is per-deployment data.
- * Inference preferences and the per-turn timeout are resolved at
- * deploy time; the schedule trigger is fixed on the definition.
+ * Everything the definition needs that is per-deployment data. The
+ * trigger address names a specific deployment's inbox, so a definition
+ * built here is per-deployment by construction.
  */
 export interface WorkbenchDigestWorkflowInput {
+  /** The deployment's mail address; each inbound mail is one run. */
+  readonly triggerAddress: string;
   /** Provider/model preferences, in order; resolved at deploy time. */
   readonly inferencePreferences: readonly InferencePreference[];
   /** Per-turn timeout in milliseconds, enforced on the single step. */
@@ -58,12 +61,15 @@ export interface WorkbenchDigestWorkflowInput {
 export function buildWorkbenchDigestWorkflow(
   input: WorkbenchDigestWorkflowInput,
 ): WorkflowDefinition {
+  if (input.triggerAddress === "") {
+    throw new Error("buildWorkbenchDigestWorkflow requires a non-empty triggerAddress");
+  }
   if (!Number.isInteger(input.turnTimeoutMs) || input.turnTimeoutMs <= 0) {
     throw new Error("buildWorkbenchDigestWorkflow requires turnTimeoutMs to be a positive integer");
   }
   return defineWorkflow({
     id: WORKBENCH_DIGEST_WORKFLOW_ID,
-    trigger: { type: "schedule", cron: WORKBENCH_DIGEST_SCHEDULE_CRON },
+    trigger: { type: "mail", to: input.triggerAddress },
     steps: {
       "workbench-digest": step({
         agent: defineAgent({
diff --git a/workflows/workbench-digest/test/definition.test.ts b/workflows/workbench-digest/test/definition.test.ts
index a168a9a986..48b6de6c1e 100644
--- a/workflows/workbench-digest/test/definition.test.ts
+++ b/workflows/workbench-digest/test/definition.test.ts
@@ -7,7 +7,6 @@ import { expect, test } from "bun:test";
 import type { StepPrimitive, WorkflowDefinition } from "@intx/workflow";
 
 import {
-  WORKBENCH_DIGEST_SCHEDULE_CRON,
   WORKBENCH_DIGEST_STEP_ID,
   WORKBENCH_DIGEST_SYSTEM_PROMPT,
   WORKBENCH_DIGEST_WORKFLOW_ID,
@@ -16,6 +15,7 @@ import {
 } from "../src/index";
 
 const INPUT = {
+  triggerAddress: "ins_dep000000000000@example.test",
   inferencePreferences: [{ provider: "anthropic", model: "claude-test" }],
   turnTimeoutMs: 60000,
 } as const;
@@ -39,11 +39,10 @@ test("the step carries an explicit per-turn timeout", () => {
   expect(digestStep(definition).timeout).toBe(INPUT.turnTimeoutMs);
 });
 
-test("the workflow is triggered on the daily 09:00 UTC schedule", () => {
+test("the workflow is triggered by mail to the given deployment address", () => {
   const definition = buildWorkbenchDigestWorkflow(INPUT);
   expect(definition.id).toBe(WORKBENCH_DIGEST_WORKFLOW_ID);
-  expect(definition.triggers).toEqual([{ type: "schedule", cron: "0 9 * * *" }]);
-  expect(WORKBENCH_DIGEST_SCHEDULE_CRON).toBe("0 9 * * *");
+  expect(definition.triggers).toEqual([{ type: "mail", to: INPUT.triggerAddress }]);
 });
 
 test("the agent instructs relaying the exact summary line, carries the preferences, and inlines no tools", () => {
@@ -86,6 +85,12 @@ test("serialization fails loud on a function-valued field, naming its path", ()
   );
 });
 
+test("an empty trigger address is rejected", () => {
+  expect(() => buildWorkbenchDigestWorkflow({ ...INPUT, triggerAddress: "" })).toThrow(
+    /triggerAddress/,
+  );
+});
+
 test("a non-positive or fractional turn timeout is rejected", () => {
   expect(() => buildWorkbenchDigestWorkflow({ ...INPUT, turnTimeoutMs: 0 })).toThrow(
     /turnTimeoutMs/,