Echo MCP v0.1.0 is the first public source-available release.
Highlights:
- MCP stdio control plane
- REST HTTP data plane
- OpenAPI 3.0.x JSON contract validation
- Webhook-style event delivery to developer-configured endpoints
- In-memory deterministic behavior
- AI-first installation and usage documentation
Security note:
Echo MCP is intended for local development and controlled test environments. Do not expose the HTTP data plane to untrusted networks.
License:
Source-available under Elastic License 2.0. Not OSI open source.