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Testing MCP agents offline: the recording is the server 📼

This story is from 2026-10-11. It is preserved in the archive; the latest stories are on the live feed.

TL;DR 📼 mcp-cassette records one real MCP session into a JSONL file, then serves that file as an MCP server . Any client, in any language, runs its tests against the recording offline: no credentials, no rate limits, no network. 🤔 The problem If your agent calls tools over the Model Context Proto…

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  1. 2026-10-11 08:55 · DEV Community — AI
    Testing MCP agents offline: the recording is the server 📼

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