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io.github.philo-kim/openharness

Official registry Developer tools

Lets AI coding agents discover and reference each other's recent sessions.

Source code 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 @freebird-ai/openharness
Claude Code 
claude mcp add openharness -- npx -y @freebird-ai/openharness@0.1.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "openharness": {
            "command": "npx",
            "args": [
                "-y",
                "@freebird-ai/openharness@0.1.1"
            ]
        }
    }
}

Documentation

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

Contents
  1. OpenHarness
  2. Supported Agents (MVP)
  3. Prerequisites
  4. Install
  5. MCP Tools
  6. Project Matching
  7. How It Works
  8. Manual MCP Configuration
  9. License

OpenHarness

AI 코딩 에이전트의 최근 세션 파일을 찾아 서로 참조하게 해주는 로컬 MCP 서버.

전용 하네스 없이 하네스처럼 동작한다. 기존 도구 환경을 그대로 유지하면서, 에이전트 간 세션을 연결하는 디스커버리 레이어.

Supported Agents (MVP)

AgentSession PathFormat
Claude Code~/.claude/projects/JSONL
Codex CLI~/.codex/sessions/JSONL
Gemini CLI~/.gemini/tmp/<hash>/chats/JSON

Prerequisites

  • Each agent must be able to read local files directly.
  • OpenHarness only provides paths and metadata — it does not transform, relay, or store session content.

Install

npm install -g @freebird-ai/openharness
openharness init

This registers OpenHarness as an MCP server in each agent's config.

MCP Tools

get_agent_sessions

Returns recent session paths for all agents, filtered by project.

Input:

{ "project": "/Users/me/my-app" }

Output:

[
  {
    "agent": "claude-code",
    "path": "/Users/me/.claude/projects/-Users-me-my-app/session.jsonl",
    "format": "jsonl",
    "updatedAt": "2026-03-17T14:32:00Z",
    "matchedProject": "/Users/me/my-app",
    "matchedBy": "directory-name"
  }
]
get_agent_session

Returns the recent session path for a specific agent.

Input:

{ "agent": "claude-code", "project": "/Users/me/my-app" }

Output:

{
  "agent": "claude-code",
  "path": "/Users/me/.claude/projects/-Users-me-my-app/session.jsonl",
  "format": "jsonl",
  "updatedAt": "2026-03-17T14:32:00Z",
  "matchedProject": "/Users/me/my-app",
  "matchedBy": "directory-name"
}

Returns null if no session is found.

Project Matching

AgentStrategy
Claude CodeProject path escaped with - as directory name
Codex CLIWorkspace field inside session JSONL
Gemini CLIProject path hash matching tmp/<hash>/

How It Works

User → Codex: "Review what Claude Code worked on recently"

Codex → OpenHarness MCP: get_agent_session({ agent: "claude-code", project: "..." })
Codex ← receives session path + metadata
Codex → reads the JSONL file directly and performs review

No rules needed in agent instruction files. MCP tool descriptions are enough for agents to use naturally.

Manual MCP Configuration

If you prefer to configure manually instead of using init:

{
  "mcpServers": {
    "openharness": {
      "command": "openharness",
      "args": []
    }
  }
}

Add this to your agent's MCP config file:

AgentConfig File
Claude Code~/.claude/mcp.json or project .mcp.json
Codex CLIproject .codex/
Gemini CLI~/.gemini/settings.json

License

MIT

Frequently asked questions

What is io.github.philo-kim/openharness?

Lets AI coding agents discover and reference each other's recent sessions.

How do I install io.github.philo-kim/openharness?

It runs on your machine. In Claude Code: claude mcp add openharness -- npx -y @freebird-ai/openharness@0.1.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.philo-kim/openharness 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.philo-kim/openharness open source?

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

Who maintains io.github.philo-kim/openharness?

It is published by philo-kim. AI.tn lists it but does not maintain or endorse it.

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