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Webhook & callback layer for AI agents: create a URL, wait_for_callback, and verify over MCP.
About
Webhook & callback layer for AI agents: create a URL, wait_for_callback, and verify over MCP.
Security Report
This MCP server is well-structured with proper authentication, input validation, and secure credential handling. The API token is correctly sourced from environment variables and never logged or hardcoded. The server appropriately validates input (URL encoding, timeout bounds, limit clamping) and returns errors safely. Permissions align well with the server's purpose as a webhook/callback management tool. Supply chain analysis found 2 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
3 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: HOOKSENSE_TOKEN
Environment variable: HOOKSENSE_API
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-ozers-hooksense": {
"env": {
"HOOKSENSE_API": "your-hooksense-api-here",
"HOOKSENSE_TOKEN": "your-hooksense-token-here"
},
"args": [
"-y",
"@hooksense/mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
@hooksense/mcp
Model Context Protocol server for HookSense — the webhook & callback layer for AI agents. Lets Claude Desktop, Cursor, Claude Code, Continue, and any MCP client create a callback URL, wait for the result instead of polling, and verify its signature — all from the agent session.
Why
Agents that kick off async work — a deploy, a render, a human-in-the-loop approval, a long tool call, another agent — need the result back without burning context on polling loops. With this server the agent creates a callback endpoint, hands the URL to the job, then calls wait_for_callback and is woken the instant the webhook lands — signature-verified and decrypted. Stop polling for async results; await them.
Setup
- Get an API token at https://hooksense.com/account/tokens
- Configure your MCP client (examples below)
Claude Desktop / Claude Code
Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):
{
"mcpServers": {
"hooksense": {
"command": "npx",
"args": ["-y", "@hooksense/mcp"],
"env": {
"HOOKSENSE_TOKEN": "hsk_your_token_here"
}
}
}
}
Cursor
Add to ~/.cursor/mcp.json:
{
"mcpServers": {
"hooksense": {
"command": "npx",
"args": ["-y", "@hooksense/mcp"],
"env": {
"HOOKSENSE_TOKEN": "hsk_your_token_here"
}
}
}
}
Hello callback (60 seconds)
Once configured, ask your agent:
- Create — "Create a callback endpoint." → the agent calls
create_callback_endpointand gets back acallbackUrllikehttps://hooksense.com/w/ab12cd. - Fire — point any job at that URL (or just
curl -X POST <callbackUrl> -d '{"status":"done"}'from another terminal). - Await — "Wait for the callback." → the agent calls
wait_for_callbackand blocks until the webhook lands, then receives{ status: "received", request: { body, headers, … } }. - Verify (optional) — set a webhook secret on the endpoint, then "Verify the signature." →
verify_signatureconfirms the payload is authentic before the agent acts on it.
No polling, no dashboards, no copy-paste.
Tools
| Tool | Description |
|---|---|
create_callback_endpoint | Create a callback endpoint; returns the callbackUrl |
wait_for_callback | Block until the next callback lands, then return it (timeoutMs, after cursor) |
list_callbacks | List callbacks received by an endpoint (summary view) |
get_callback_payload | Fetch one callback with full headers + decrypted body |
verify_signature | Timing-safe HMAC check against the endpoint's configured secret |
replay_callback | POST a received callback to any target URL |
list_endpoints | List your endpoints |
get_endpoint | Get one endpoint's full settings |
Environment
| Variable | Default | Notes |
|---|---|---|
HOOKSENSE_TOKEN | (required) | API token from /account/tokens |
HOOKSENSE_API | https://hooksense.com | Override for self-hosted/staging |
Example agent prompts
"Create a callback endpoint, use it as the webhook for my Replicate prediction, and wait for the result — then summarize the output."
"Open a callback URL, give it to the approval step, and block until a human approves before continuing."
"Wait for the next Stripe callback on
payments-prod, verify its signature, and tell me the amount."
License
MIT
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