Record Replay Python Packages

retracesoftware

Turn failed Python tests and CI runs into replayable debug sessions.

replayx

Record and replay HTTP/S interactions for httpx. Fast, offline, deterministic tests. Install: pip install replayx

promptecho

Record & replay for LLM API calls. Like vcrpy / nock, but built for the way LLM traffic actually behaves.

tracefork

Time-travel debugger for AI agents: record a run to a content-addressed tape, replay it bit-exact for $0 (hash-verified), fork any step, and measure causal blame with confidence intervals.

karellen-rr-mcp

MCP Server for rr Reverse Debugging

orgecc-command-mock

VCR for subprocess calls. Record and replay CLI command outputs (Git, Docker, etc.) for fast, deterministic Python tests

flightbox

Record, replay, and diff every LLM call your AI agent makes

mcp-rec

Record and replay MCP servers — VCR for the Model Context Protocol.