Denylist Stuck Messages

Add message IDs to the relayer denylist configuration, create a PR, and deploy.

When to Use

1. After investigation:

   • User ran

     /investigate-stuck-messages

     and wants to denylist the found messages
   • User says "denylist these" or "add these to blacklist"

2. Direct denylist request:

   • User provides specific message IDs to denylist
   • User pastes message IDs from explorer or logs

Input Parameters

/denylist-stuck-messages <message_ids> [app_context=NAME] [reason=REASON]

message_ids

app_context

reason

environment

mainnet3

Examples:

/denylist-stuck-messages 0xabc123 0xdef456 app_context=USDC/mainnet-cctp-v2-standard

/denylist-stuck-messages
0xabc123
0xdef456
0x789ghi

Workflow

Step 1: Parse Message IDs

Extract all message IDs from the input. Valid formats:

• Space-separated:

  0xabc 0xdef 0x123

• Newline-separated
• Comma-separated:

  0xabc, 0xdef, 0x123

Validate each ID:

• Must start with

  0x

• Must be 66 characters (0x + 64 hex chars)

Step 2: Confirm with User

Use

AskUserQuestion

Ready to denylist X messages for [APP_CONTEXT]:

| Message ID |
|------------|
| 0xabc123... |
| 0xdef456... |

Proceed?

Options:

1. "Yes, denylist all" (Recommended)
2. "Let me modify the list"
3. "Cancel"

Step 3: Get User's GitHub Handle

Ask for GitHub handle if not known:

What is your GitHub handle for the branch name?

Step 4: Update Blacklist Configuration

Edit

typescript/infra/config/environments/mainnet3/customBlacklist.ts

1. Read the current file
2. Add new message IDs to the

   blacklistedMessageIds

   array
3. Include a comment with:
   • App context name
   • Date (YYYY-MM-DD format)
   • Reason

Example addition:

  // [APP_CONTEXT] [REASON] [YYYY-MM-DD]
  '0xabc123...',
  '0xdef456...',

Add entries near the end of the array, before the closing bracket.

Step 5: Create Branch and Pull Request

# Checkout main and pull latest
git checkout main && git pull origin main

# Create branch
git checkout -b <github_handle>/denylist-<app_context>

# Stage changes
git add typescript/infra/config/environments/mainnet3/customBlacklist.ts

# Commit
git commit -m "chore: denylist <APP_CONTEXT> stuck messages

Added X message IDs to denylist for <APP_CONTEXT> route.
Reason: <REASON>

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>"

# Push and create PR
git push -u origin HEAD
gh pr create --title "chore: denylist <APP_CONTEXT> stuck messages" --body "$(cat <<'EOF'
## Summary
- Added X message IDs to the relayer denylist
- App context: `<APP_CONTEXT>`
- Reason: <REASON>

## Message IDs
<list of message IDs>

## Test plan
- [ ] Review message IDs are correct
- [ ] Deploy relayer with updated denylist

Generated with [Claude Code](https://claude.com/claude-code)
EOF
)"

Step 6: Output Slack Message

Before asking about deployment, output the Slack message:

**Slack Message (copy/paste to #relayer-alerts):**

:no_entry_sign: *Denylist PR created*

App context: `<APP_CONTEXT>`
Messages denylisted: X
Reason: <REASON>

PR: <PR_URL>

Step 7: Ask About Deployment

Use

AskUserQuestion

PR created. Deploy the relayer now with the updated denylist?

Options:

1. "Yes, deploy now" (Recommended)
2. "No, I'll deploy later"

If user confirms, run:

pnpm --dir typescript/infra exec tsx ./scripts/agents/deploy-agents.ts -e mainnet3 --context hyperlane --role relayer

If user skips, output the command for later use.

Step 8: Update Slack Message After Deploy

If deployed, update the Slack message:

:no_entry_sign: *Denylist deployed*

App context: `<APP_CONTEXT>`
Messages denylisted: X
Reason: <REASON>

PR: <PR_URL>

Grouping by Destination

If message IDs are for multiple destinations (from investigation output), group them in the blacklist file:

  // [APP_CONTEXT] stuck messages [YYYY-MM-DD]
  // dest: arbitrum
  '0xabc123...',
  '0xdef456...',
  // dest: optimism
  '0x789ghi...',
  '0xjkl012...',

Error Handling

• Invalid message ID format: Show which IDs are invalid, ask user to fix
• Git conflicts: Pull latest main and retry
• PR creation fails: Check gh auth status
• Deployment fails: Show error, suggest manual deployment

Prerequisites

• gh

  CLI authenticated
• Git configured with push access to the repo
• For deployment:

  kubectl

  configured with mainnet cluster access