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Mercury Engineering

The team behind Mercury. Postmortems, design notes and the reasoning behind how Mercury works.

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EngineeringOct 15, 20265 min read

The setup wizard that quit at the first menu

For six releases, a brand-new Mercury install asked for your name, showed one menu, and exited without an error. A walkthrough of a one-tick race between two readers of the same terminal, and the test that now keeps it from coming back.

Mercury Engineering

ProductOct 9, 20266 min read

Asks before it acts: how Mercury's permission model works

An agent with a shell, a file system and network access is only useful if you can trust what it will do with them. A tour of the layers between the model and your machine: scopes, approvals, a blocklist nothing can override, an SSRF guard, and tiers for unattended bots.

Mercury Engineering