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io.github.useotterkit/otterkit

Official registry Security

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

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package otterkit
Claude Code 
claude mcp add otterkit -- npx -y otterkit@0.12.2 mcp
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "otterkit": {
            "command": "npx",
            "args": [
                "-y",
                "otterkit@0.12.2",
                "mcp"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

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.

SkillWhat the agent learns
otterkitCore: tunnels, webhook endpoints, capture, inspect, replay, daemons, pricing
stripe-webhooksStripe: signed synthetic events, Stripe-Signature verification, re-signed replay
github-webhooksGitHub Apps: persistent capture endpoint, X-Hub-Signature-256 verification, replay
shopify-webhooksShopify: stable --tunnel-url for the CLI, HMAC verification, standby endpoints
slack-webhooksSlack: 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):

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:

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.

Frequently asked questions

What is io.github.useotterkit/otterkit?

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

How do I install io.github.useotterkit/otterkit?

It runs on your machine. In Claude Code: claude mcp add otterkit -- npx -y otterkit@0.12.2 mcp. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.useotterkit/otterkit need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.useotterkit/otterkit open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains io.github.useotterkit/otterkit?

It is published by useotterkit. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.