diff --git a/packages/core/src/__tests__/channel-messenger.test.ts b/packages/core/src/__tests__/channel-messenger.test.ts
index 1e9867e..0b39775 100644
--- a/packages/core/src/__tests__/channel-messenger.test.ts
+++ b/packages/core/src/__tests__/channel-messenger.test.ts
@@ -4,7 +4,9 @@ import { describe, expect, it, vi } from 'vitest';
 import {
   ChannelMessenger,
   formatError,
+  formatObserverGuidance,
   formatStepOutput,
+  scrubSecrets,
   sendToChannel,
   truncateMessage,
 } from '../channel-messenger.js';
@@ -42,6 +44,42 @@ describe('channel messenger helpers', () => {
     expect(formatted).not.toContain('ghp_abcdefghijklmnopqrstuvwxyzABCDEFGHIJ');
   });
 
+  it.each([
+    'rk_live_0123456789abcdef',
+    'at_live_0123456789abcdef',
+    'nt_live_0123456789abcdef',
+    'ot_live_0123456789abcdef',
+    'cld_at_0123456789abcdef',
+    'rth_at_0123456789abcdef',
+    'ocl_node_enr_0123456789abcdef',
+    'br_0123456789abcdef',
+  ])('scrubSecrets redacts Relay credential value %s', (credential) => {
+    const scrubbed = scrubSecrets(`request denied for ${credential}`);
+    expect(scrubbed).toBe('request denied for [REDACTED]');
+    expect(scrubbed).not.toContain(credential);
+  });
+
+  it.each([
+    'broker started on port 3888',
+    'the library is at ./br',
+    'abbreviation',
+    'number_of_brokers=4',
+    'https://agentrelay.com/observer',
+  ])('scrubSecrets preserves non-secret output %s', (text) => {
+    expect(scrubSecrets(text)).toBe(text);
+  });
+
+  it('omits credential-bearing observer links from auto-created workspace guidance', () => {
+    const guidance = formatObserverGuidance('workflow-room');
+
+    expect(guidance).toEqual([
+      'Workspace created for this workflow.',
+      '  Observation: requires a separately provisioned, read-only observer token',
+      '  Channel: workflow-room',
+    ]);
+    expect(guidance.join('\n')).not.toMatch(/observer\?key=|\[REDACTED\]/);
+  });
+
   it('formatError normalizes unknown errors', () => {
     expect(formatError('build', new Error('Boom'))).toBe('**[build]** Failed: Boom');
     expect(formatError('build', 'bad input')).toBe('**[build]** Failed: bad input');
diff --git a/packages/core/src/channel-messenger.ts b/packages/core/src/channel-messenger.ts
index 565afa7..6634efb 100644
--- a/packages/core/src/channel-messenger.ts
+++ b/packages/core/src/channel-messenger.ts
@@ -47,6 +47,7 @@ export function formatError(stepName: string, error: unknown): string {
 // Common secret patterns to redact from channel output.
 const SECRET_PATTERNS = [
   /(?:api[_-]?key|apikey|secret[_-]?key|access[_-]?token|auth[_-]?token|bearer)\s*[:=]\s*\S+/gi,
+  /(?:rk_live_|at_live_|nt_live_|ot_live_|cld_at_|rth_at_|ocl_node_enr_|br_)[a-zA-Z0-9_%-]+(?:\.[a-zA-Z0-9_%-]+)*/g,
   /(?:sk|pk|rk|ak)[-_][a-zA-Z0-9]{20,}/g,
   /ghp_[a-zA-Z0-9]{36,}/g,
   /gho_[a-zA-Z0-9]{36,}/g,
@@ -97,6 +98,14 @@ export function scrubSecrets(text: string): string {
   return result;
 }
 
+export function formatObserverGuidance(channel: string): string[] {
+  return [
+    'Workspace created for this workflow.',
+    '  Observation: requires a separately provisioned, read-only observer token',
+    `  Channel: ${channel}`,
+  ];
+}
+
 function stripMalformedPtyFrameGarbage(line: string): string {
   const strippedRuns = line.replace(MALFORMED_PTY_FRAME_RUN_RE, ' ');
   const compact = strippedRuns.replace(SPINNER_RE, '').replace(/\s+/g, '');
diff --git a/packages/core/src/runner.ts b/packages/core/src/runner.ts
index ee17545..b767fa2 100644
--- a/packages/core/src/runner.ts
+++ b/packages/core/src/runner.ts
@@ -64,7 +64,11 @@ import { ensureRelayfileMount, type MountHandle } from '@relayfile/sdk/workspace
 import { collectCliSession, type CliSessionReport } from './cli-session-collector.js';
 import { executeApiStep } from './api-executor.js';
 import { BudgetExceededError, BudgetTracker } from './budget-tracker.js';
-import { ChannelMessenger, scrubForChannel as scrubWorkflowOutputForChannel } from './channel-messenger.js';
+import {
+  ChannelMessenger,
+  formatObserverGuidance,
+  scrubForChannel as scrubWorkflowOutputForChannel,
+} from './channel-messenger.js';
 import { InMemoryWorkflowDb } from './memory-db.js';
 import { buildCommand as buildProcessCommand, spawnProcess } from './process-spawner.js';
 import { createProcessBackendExecutor } from './process-backend-executor.js';
@@ -3780,10 +3784,10 @@ export class WorkflowRunner {
           this.log('Resolving Relaycast API key...');
           await this.ensureRelaycastApiKey(channel);
           this.log('API key resolved');
-          if (this.relayApiKeyAutoCreated && this.relayApiKey) {
-            this.log(`Workspace created — follow this run in Relaycast:`);
-            this.log(`  Observer: https://agentrelay.com/observer?key=${this.relayApiKey}`);
-            this.log(`  Channel: ${channel}`);
+          if (this.relayApiKeyAutoCreated) {
+            for (const line of formatObserverGuidance(channel)) {
+              this.log(line);
+            }
           }
         }