Replay MCP
Replay MCP lets agents inspect time-travel browser recordings, including console output, exceptions, network activity, source code, React state, performance profiles, screenshots, and execution points.
What agents can do
Actions32
Annotations
Inspect the annotations in a recording.
Console messages
Show console API messages (console.log, console.warn, console.error, etc.).
Describe point
Describes the application state at a code execution point.
Evaluate
Evaluates an expression at a code execution point.
Execution delay
Computes execution delays for functions based on their source length and the delay before the first breakpoint in each function executes.
Get point component
Gets the React component being rendered at a code execution point.
Get point link
Generates an app.replay.io link for users to inspect a given execution point.
Get stack
Gets the call stack at a code execution point.
24 moreFewer
Inspect element
Get size, layout, ancestry and render point information for a DOM element.
List sources
List the sources in the recording.
Local storage
Describe all the accesses made to localStorage.
Logpoint
Evaluates an expression at breakpoint hits for a given path and line number.
Network request
Analyze network requests in the recording.
Playwright steps
Show all steps taken by Playwright in the recording.
Profile graph
Profiles dependency graph entry execution between two points in a recording.
Profile sampling
Profiles the native C++ replay engine using stack sampling between two execution points.
Profile statements
Profiles JS statement execution between two points in a recording.
React component tree
Get the structure of the committed/mounted React component tree at a point in time.
React exception
Describe any exceptions thrown which caused React to unmount.
React performance insights
Run all deterministic React performance checks on a recording and return prioritized findings.
React renders
Analyze React renders in a recording.
Read source
Read up to 50 lines of code centered around the given line and see what statements executed.
Recording overview
Provides a comprehensive overview of a recording: test results, errors, environment info, network activity, React render performance, and suggested next investigation steps.
Redux actions
Analyze Redux actions in a recording.
Screenshot
Lists all screenshot timestamps in the recording, or fetches a screenshot at a given timestamp.
Search sources
Search the sources in the recording and see which statements executed.
Tan stack queries
Analyze TanStack Query (React Query) cache events in a recording.
Uncaught exception
Describe uncaught exceptions and unhandled promise rejections (runtime errors not caught by try/catch).
User interactions
Show all user interactions (clicks and key presses) in the recording.
Warm recording
Starts processing a recording if needed and reports its status.
Web socket messages
Inspect the WebSocket connections in a recording and the messages sent and received on them.
Zustand stores
Analyze Zustand stores in a recording.
How it connects
You paste an API key from Replay MCP on a page Composio hosts, so the key never passes through Definable.
Keep the connection to yourself or share it with your workspace. Any action that writes or sends can wait for your approval.
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