The firewall for MCP tool calls. Block, audit, replay with evidence bundles.
io.github.Rul1an/assay
https://github.com/Rul1an/assay
STDIO
No auth required
How models use it and what it is built for.
The firewall for MCP tool calls. Block, audit, replay with evidence bundles.
Hosted endpoint — paste into any MCP client.
Where to find authoritative docs and source for assay.
MCP Playground runs 10,000+ hosted MCP servers — GitHub, Linear, Notion, Stripe, Sentry and more — across Claude, GPT, Gemini, DeepSeek and 30+ AI models. Compare model answers side-by-side, save agent presets, share runs. Zero install.
Open Agent Studio