Otterkit

Tunnels and webhooks for AI agents: capture, await, verify, replay, and send signed test events.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "otterkit": {
      "command": "npx",
      "args": [
        "-y",
        "otterkit"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

OtterKit Agent Skills

Skills that teach AI coding agents (Claude Code, Cursor, Copilot — anything that reads the Agent Skills format) to drive OtterKit: tunnels and serverless webhook endpoints with capture, signature verification, and replay.

Skill	What the agent learns
`otterkit`	Core: tunnels, webhook endpoints, capture, inspect, replay, daemons, pricing
`stripe-webhooks`	Stripe: signed synthetic events, `Stripe-Signature` verification, re-signed replay
`github-webhooks`	GitHub Apps: persistent capture endpoint, `X-Hub-Signature-256` verification, replay
`shopify-webhooks`	Shopify: stable `--tunnel-url` for the CLI, HMAC verification, standby endpoints
`slack-webhooks`	Slack: Events API via capture tunnel, signing-secret verification, re-signed replay

Install (Claude Code)

Copy any skill directory into .claude/skills/ in your project (or ~/.claude/skills/ for all projects):

bash

git clone https://github.com/useotterkit/skill && cp -r skill/stripe-webhooks .claude/skills/

Or add the OtterKit MCP server, which exposes the same capabilities as tools:

Terminal

claude mcp add otterkit -- npx otterkit mcp

What's different from a plain tunnel

Every skill leans on three things ngrok-class tools don't do:

otterkit send — synthetic provider events signed with real signature headers (stripe:payment_intent.succeeded, github:pull_request.opened, …) against a local handler, free, no provider account interaction.
otterkit verify — check captured deliveries against a signing secret, per request, with the failure reason.
otterkit replay --resign — re-deliver a captured event to local code, re-signed with a current timestamp so timestamp-tolerant handlers (Stripe, Slack) still accept it.

Skills are generated from the CLI's actual implementation and updated alongside it.

Read the full README →View source on GitHub →

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Frequently Asked Questions about Otterkit

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "otterkit": { "command": "npx", "args": ["-y", "otterkit"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Otterkit →Install in Claude Desktop Install in Cursor Install in VS Code