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Harper 5.1 Makes Your Applications MCP-Native

Blog post from Harper

Post Details
Company
Date Published
Author
Kris Zyp
Word Count
567
Company Posts That Month
12
Language
English
Hacker News Points
-
Post removed?
No
Summary

Harper 5.1 introduces a complete Model Context Protocol (MCP) server implementation, allowing any MCP-compatible client to connect to a Harper instance for operations like reading, writing, and invoking processes through a standardized protocol. This version distinguishes itself by automatically generating tools from an application's schema, eliminating the need for adapter code when deploying components with HTTP resource handlers. The MCP server supports two transports, streamable HTTP and stdio via the harper mcp CLI, and manages sessions with TTL-based expiration. Tools are auto-generated in two categories: operations tools, which are subject to role-based access control (RBAC), and application tools derived from HTTP resource handlers. Each tool call is logged, and every MCP session has configurable rate limits, with notifications for changes in tables or components. Users can connect locally via stdio transport or remotely with Streamable HTTP, although verbose tool names and the absence of a general alias layer are noted limitations. The current design anticipates the addition of new tool categories in the future.

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