# orcareplay

Records coding-agent runs, replays them offline, and lets you fork a run onto another model. Useful when you need to inspect a failure.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 281
- Author: Continuum-AI-Corp
- License: Apache-2.0 · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Continuum-AI-Corp/OrcaReplay
- Updated: 2026-10-01
- HTML: https://affpapa.org/en/nevibecode/mcp/orcareplay

## What it does

orcareplay records a coding-agent session through a local proxy, then replays the saved trace without making another model call. You can inspect which tool call changed a file, rerun the same session after the terminal is closed, or branch from a chosen step and use a different model.

The server runs through `npx` and does not require edits to the agent. The proxy observes requests, responses, tool calls, and tool results through environment variables. During a normal replay, requests that are missing from the trace are blocked, while recorded tool calls still run for real. A command such as `curl`, or an MCP server that opens its own connection, sits outside that guarantee. Node.js 20+ is required.

## Requirements
- Needs: Node.js (commands run via npx)

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add orcareplay -- npx -y orcareplay
```

### Codex

**Platform CLI**
```bash
codex mcp add orcareplay -- npx -y orcareplay
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "orcareplay": {
            "command": "npx",
            "args": [
                "-y",
                "orcareplay"
            ]
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "orcareplay": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "orcareplay"
            ]
        }
    }
}
```

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add orcareplay npx -y orcareplay
```

## When to use it
- record a coding-agent session
- replay a failure without another model call
- identify the tool call that changed a file
- fork a run from a selected step
- compare another model on the same trace

## Example prompts
- Show me the last recorded run and identify the step that removed the file.
- Replay the latest run offline without contacting a model.
- Fork the recording from step 4 onto another model and compare the result.

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md