What is Replay?
Replay records deterministic captures of browser sessions, including every DOM change, network request, and state update. The tool analyzes these recordings to identify root causes of bugs and delivers detailed fixes directly to coding agents through MCP integration or plain English via a Chrome extension.
It provides automated root-cause analysis that traces through recordings to find exact causes, delivering implementation-ready fixes with full context. Replay works with various coding agents like Claude Code, Cursor, Copilot, and Windsurf, giving them runtime visibility they otherwise lack.
Features
- Session Recording: Captures deterministic browser sessions with all DOM changes, network requests, and state updates
- Root Cause Analysis: Automatically traces through recordings to identify exact causes of bugs
- Detailed Fixes: Provides specific, implementation-ready fixes with full code context
- Agent Integration: Works with coding agents via MCP or Chrome extension
- Team Collaboration: Supports team sharing and collaborative sessions
Use Cases
- Debugging failing tests in development workflows
- Investigating user-reported bugs in production applications
- Diagnosing flaky tests in continuous integration pipelines
- Unblocking coding agents stuck in debugging loops
- Automating bug triage and fix generation
FAQs
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What is Replay MCP?
Replay MCP is a Model Context Protocol server that connects Replay's recording and analysis engine to coding agents, providing root cause analysis and detailed fixes from browser recordings. -
Which coding agents does Replay work with?
Replay works with Claude Code, Cursor, Copilot, Windsurf, and any agent that supports MCP. -
What counts as a session in Replay?
A session is one recorded debugging interaction where a bug is captured, analyzed, and returned with a root cause and proposed fix. -
Does recording slow down my app or tests?
The content does not provide specific information about performance impact of recording. -
What kinds of bugs does Replay work best for?
The content does not provide specific information about bug types Replay handles best.
