Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly
Sign up
Appearance settings

feat(blocks): add Webhook tool for sending HTTP requests #2400

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
DeepakSilaych wants to merge 1 commit into simstudioai:main
base: main
Choose a base branch
Loading
from DeepakSilaych:feat/hitl-webhook-notification

Conversation

@DeepakSilaych
Copy link

@DeepakSilaych DeepakSilaych commented Dec 16, 2025

Adds a new Webhook tool block that allows sending HTTP requests to external webhook endpoints. This fixes the bug where users couldn't find a Webhook option in the Human in the Loop notification section as documented.

The block has category: 'tools' so it appears in:

  • Human in the Loop notification dropdown (fixes the reported bug)
  • Agent block's tool selector (enables agents to call webhooks)

Fixes #2379

Type of Change

  • Bug fix
  • New feature
  • Breaking change
  • Documentation
  • Other: ___________

Testing

  1. Open a workflow with a Human in the Loop block
  2. Click the Notification field
  3. Verify "Webhook" now appears in the tool dropdown
  4. Configure URL, method, headers, and body
  5. Test the webhook sends correctly when HITL pauses

Also verify the Webhook tool appears in Agent block's tool selector.

Checklist

  • Code follows project style guidelines
  • Self-reviewed my changes
  • Tests added/updated and passing
  • No new warnings introduced
  • I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

Screenshot 2025年12月16日 at 14 45 12

greptile-apps[bot] reacted with thumbs up emoji 
Fixes simstudioai#2379
- Add WebhookNotificationBlock with category 'tools'
- Supports POST/PUT/PATCH methods with custom headers and body
- Uses existing http_request tool under the hood
- Available in Agent tools and HITL notifications
Copy link

vercel bot commented Dec 16, 2025

@DeepakSilaych is attempting to deploy a commit to the Sim Team on Vercel.

A member of the Team first needs to authorize it.

Copy link
Contributor

greptile-apps bot commented Dec 16, 2025

Greptile Overview

Greptile Summary

Adds a new Webhook tool block that enables sending HTTP POST/PUT/PATCH requests to external endpoints. The block properly integrates with the existing architecture by:

  • Using category: 'tools' so it appears in both the Human in the Loop notification dropdown and Agent tool selector
  • Leveraging the existing http_request tool for actual request execution
  • Following the established block configuration pattern with proper inputs/outputs and subBlocks
  • Including AI-assisted JSON body generation via wandConfig

The implementation correctly fixes issue #2379 where users couldn't find a Webhook option in the HITL notification section.

Confidence Score: 4/5

  • This PR is safe to merge with minor style improvements recommended
  • The implementation correctly solves the reported bug and follows existing patterns. Only minor style inconsistencies exist with the icon import (uses lucide-react directly instead of @/components/icons). The block properly integrates with the http_request tool and HITL system.
  • No files require special attention - the style issues are minor and optional

Important Files Changed

File Analysis

Filename Score Overview
apps/sim/blocks/blocks/webhook_notification.ts 4/5 adds new Webhook tool block with HTTP request support; minor style issue with icon import pattern
apps/sim/blocks/registry.ts 5/5 correctly imports and registers the new WebhookNotificationBlock in alphabetical order

Sequence Diagram

sequenceDiagram
 participant User
 participant HITL as Human in the Loop Block
 participant Webhook as Webhook Notification Block
 participant HTTPTool as http_request Tool
 participant External as External Webhook Endpoint
 User->>HITL: Configure notification
 HITL->>HITL: Show tool dropdown (category: 'tools')
 User->>Webhook: Select "Webhook" from dropdown
 User->>Webhook: Configure URL, method, headers, body
 
 Note over HITL: Workflow pauses
 
 HITL->>Webhook: Trigger notification
 Webhook->>HTTPTool: Execute with params (url, method, headers, body)
 HTTPTool->>External: Send HTTP request (POST/PUT/PATCH)
 External-->>HTTPTool: Return response
 HTTPTool-->>Webhook: Return {data, status, headers}
 Webhook-->>HITL: Notification sent
 
 Note over HITL: Wait for approval
 
 User->>HITL: Approve/Resume
 HITL->>User: Workflow continues
Loading

Copy link
Contributor

@greptile-apps greptile-apps bot left a comment •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Additional Comments (3)

  1. apps/sim/blocks/blocks/webhook_notification.ts, line 5 (link)

    style: use WebhookIcon from @/components/icons instead of lucide-react for consistency with other blocks

    Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

  2. apps/sim/blocks/blocks/webhook_notification.ts, line 1-6 (link)

    style: remove unused createElement import and helper function since we should use WebhookIcon from @/components/icons

    Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

  3. apps/sim/blocks/blocks/webhook_notification.ts, line 20 (link)

    style: reuse the same icon reference pattern used in the existing WebhookBlock at apps/sim/blocks/blocks/webhook.ts:42

    Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

2 files reviewed, 3 comments

Edit Code Review Agent Settings | Greptile

Copy link
Author

DeepakSilaych commented Dec 16, 2025 •
edited
Loading

I did consider the minimal fix: just include the existing api block in the tool-input filter so it shows up in HITL notifications. That would be a ~1-line change and would technically solve the "no webhook option" problem.

I chose the dedicated Webhook tool (category tools) because:

  • The HITL "Notification" UI is conceptually "pick a tool to notify", and "Webhook" is clearer than "API" for most users.
  • tool-input is reused in multiple places (Agent tools, HITL notifications, etc.), and keeping the selection semantics "tools = integrations" felt more consistent than mixing in a core blocks primitive.
  • This avoids pushing users into the full API block UI (methods, query params, extra options) when the common use case is "send a POST to a webhook URL".

That said, if we prefer the smallest diff and don’t mind API appearing in that dropdown, the 1-line filter change is a valid alternative.

Copy link

OverSamu commented Dec 16, 2025 •
edited
Loading

If we choose to use the api block, wouldn't it be enough to move it to the tools category, instead of changing the tool-input filter?

category: 'blocks',

Copy link

Can this be merged?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

1 more reviewer

@greptile-apps greptile-apps[bot] greptile-apps[bot] left review comments

Reviewers whose approvals may not affect merge requirements

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

[BUG] Human in the Loop Webhook

AltStyle によって変換されたページ (->オリジナル) /