Rewind

What it does

Rewind is a sophisticated observability and debugging tool designed specifically for LLM-powered agents. Unlike traditional tracing tools that only show what happened, Rewind allows developers to "change the past." It captures the exact context window of every step, allowing you to fork an execution timeline at the point of failure, apply a fix (like a prompt change or model swap), and replay only the affected steps.

Tools

Rewind provides a comprehensive set of tools for agent lifecycle management:

• rewind fix: AI-powered diagnosis that identifies failures and suggests fixes.
• rewind replay: Executes a forked timeline from a specific step using cached results for previous steps.
• rewind eval: Scores original vs. forked timelines using LLM-as-judge to prove improvements.
• rewind inspect: Provides a deep dive into the exact context and messages seen by the model at any given step.
• rewind import: Ingests traces from Langfuse, Datadog, or OTel backends for local debugging.

Installation

Install the Python SDK and CLI:

pip install rewind-agent

To start recording in Python:

import rewind_agent
rewind_agent.init()

Supported hosts

• claude
• vscode-copilot
• cursor
• windsurf