# UHP Developer Guide

> Independent technical reference for the Unified Harness Protocol (UHP). This site is not affiliated with HarnessRouter or the official UHP project.

Important notes:
- Last verified: 2026-08-15.
- Current UHP version reviewed: 2026-08-11.
- Treat the official UHP specification and repository as normative; this site is explanatory.
- HarnessRouter Community Edition support for Codex, Claude Code and Hermes does not by itself mean those vendors natively adopt UHP.

## Core guide
- [What is UHP?](https://unifiedharnessprotocol.dev/what-is-uhp/): Scope, problem, lifecycle and boundaries.
- [Architecture](https://unifiedharnessprotocol.dev/architecture/): Client, server, harness, object model, sessions and transport.
- [Specification](https://unifiedharnessprotocol.dev/spec/): UHP version 2026-08-11 and implementation guidance.
- [Conformance](https://unifiedharnessprotocol.dev/conformance/): Core, Extended and Full classes; current 52-check suite.
- [UHP vs MCP](https://unifiedharnessprotocol.dev/uhp-vs-mcp/): Execution interoperability versus tool/context interoperability.
- [UHP vs Harness Protocol](https://unifiedharnessprotocol.dev/uhp-vs-harness-protocol/): Runtime execution versus portable harness configuration.

## Harnesses
- [UHP and Codex](https://unifiedharnessprotocol.dev/codex/)
- [UHP and Claude Code](https://unifiedharnessprotocol.dev/claude-code/)
- [UHP and Hermes](https://unifiedharnessprotocol.dev/hermes/)

## Ecosystem
- [Ecosystem](https://unifiedharnessprotocol.dev/ecosystem/)
- [Adoption tracker](https://unifiedharnessprotocol.dev/adoption/)
- [News](https://unifiedharnessprotocol.dev/news/)
- [Glossary](https://unifiedharnessprotocol.dev/glossary/)
- [Primary sources](https://unifiedharnessprotocol.dev/sources/)

## Official sources
- [Official UHP site](https://unifiedharnessprotocol.org/)
- [Official UHP/HarnessRouter repository](https://github.com/HarnessRouter/harnessrouter)
- [UHP 2026-08-11 specification](https://github.com/HarnessRouter/harnessrouter/tree/main/protocol/versions/2026-08-11)
- [UHP conformance suite](https://github.com/HarnessRouter/harnessrouter/tree/main/protocol/conformance)