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Midwest-AI-Solutions

CRE MCP Server

by Midwest-AI-Solutions
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TypeScript
Remote

CRE MCP Server

MCP server for the Chainlink Runtime Environment (CRE) — wraps the CRE CLI and SDK as 30 tools and 10 resources over the Model Context Protocol.

Build, simulate, deploy, and manage CRE workflows from any MCP client (Claude Code, Claude Desktop, Cursor, etc.).

Features

  • 30 MCP tools — full CRE lifecycle: auth, project scaffolding, workflow management, secrets, code generation, account keys, and Solidity contract scaffolding

  • 10 MCP resources — architecture docs, SDK reference, config schemas, contract templates, forwarder addresses

  • Solidity support — scaffold IReceiver contracts, typed consumer contracts, and CCIP receivers

  • Streamable HTTP transport — stateful sessions via Express on port 3200

Related MCP server: Heim MCP

Prerequisites

  • Node.js 18+

  • CRE CLI: curl -sSfL https://raw.githubusercontent.com/smartcontractkit/cre-cli/main/install/install.sh | bash

  • Bun (required by CRE CLI for WASM compilation): brew install oven-sh/bun/bun

Quick Start

git clone https://github.com/Midwest-AI-Solutions/cremcp.git
cd cremcp
npm install
npm run dev

The server starts at http://localhost:3200 with:

  • MCP endpoint: http://localhost:3200/mcp

  • Health check: http://localhost:3200/health

MCP Client Configuration

Claude Code (~/.claude.json)

{
  "mcpServers": {
    "cre": {
      "type": "http",
      "url": "http://localhost:3200/mcp"
    }
  }
}

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "cre": {
      "type": "http",
      "url": "http://localhost:3200/mcp"
    }
  }
}

Tools

Category

Tools

Description

Auth

cre_login, cre_logout, cre_whoami

Chainlink platform authentication

Project

cre_init, cre_build, cre_version, cre_update, cre_generate_bindings

Project scaffolding and build

Workflow

cre_workflow_simulate, cre_workflow_deploy, cre_workflow_activate, cre_workflow_pause, cre_workflow_delete

Full workflow lifecycle

Secrets

cre_secrets_create, cre_secrets_update, cre_secrets_delete, cre_secrets_list, cre_secrets_execute

DON-encrypted secrets management

Codegen

cre_scaffold_trigger, cre_scaffold_capability, cre_scaffold_handler

TypeScript workflow code generation

Docs

cre_get_docs, cre_list_capabilities, cre_list_triggers

Documentation and reference

Account

cre_account_link_key, cre_account_list_key, cre_account_unlink_key

Wallet key management

Solidity

cre_scaffold_receiver, cre_scaffold_consumer, cre_scaffold_ccip_receiver

On-chain contract scaffolding

Resources

URI

Description

cre://docs/overview

CRE architecture overview

cre://docs/sdk-reference

TypeScript SDK quick reference

cre://docs/forwarder-addresses

KeystoneForwarder addresses by chain

cre://docs/solidity-integration

End-to-end on-chain integration guide

cre://contracts/ireceiver

IReceiver interface specification

cre://contracts/consumer-template

Annotated consumer contract template

cre://config/workflow-yaml

Workflow YAML schema

cre://config/secrets-yaml

Secrets YAML schema

cre://config/project-yaml

Project YAML schema

cre://templates/workflow-ts

Minimal workflow TypeScript template

Supported Trigger Types

Type

Use Case

cron

Time-based scheduling

streams

Data Streams price updates

mercury

Mercury feed updates

log-trigger

EVM log events

on-demand

API-initiated

http

Incoming webhook

Supported Capability Types

Type

Use Case

custom-compute

Arbitrary WASM logic

write-evm

Write to EVM chains

data-feeds-read

Read Chainlink price feeds

streams-lookup

Fetch Data Streams reports

chain-reader

Read on-chain state

http-client

HTTP requests with DON consensus

consensus

Aggregate results across DON nodes

Architecture

src/
├── index.ts              # Express server + Streamable HTTP transport
├── server.ts             # McpServer instance + tool/resource registration
├── lib/
│   ├── cli-check.ts      # CRE CLI availability detection
│   ├── cli-runner.ts     # child_process.spawn wrapper
│   └── output-parser.ts  # Tool response formatting
├── tools/
│   ├── index.ts          # Tool module registration
│   ├── auth.ts           # Login, logout, whoami
│   ├── project.ts        # Init, build, version, update, generate-bindings
│   ├── workflow.ts       # Simulate, deploy, activate, pause, delete
│   ├── secrets.ts        # CRUD + execute for DON secrets
│   ├── codegen.ts        # Trigger, capability, handler scaffolding
│   ├── docs.ts           # Documentation retrieval
│   ├── account.ts        # Wallet key management
│   └── solidity.ts       # Solidity contract scaffolding
└── resources/
    ├── index.ts          # Resource module registration
    ├── docs.ts           # Overview + SDK reference
    ├── templates.ts      # Config schemas + workflow template
    └── solidity.ts       # IReceiver, consumer, forwarder addresses, integration guide

Development

npm run dev        # Start with hot reload (tsx --watch)
npm run build      # Compile TypeScript
npm start          # Run compiled JS
npm run typecheck  # Type check without emitting

Environment Variables

Variable

Default

Description

PORT

3200

Server port

CRE_CLI_PATH

~/.cre/bin/cre

Path to CRE CLI binary

License

MIT

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