System design: AI coding agent platform for 1,000 engineers (EXPLAINED)

TL;DR — Quick Answer
Centralize identity + policy, run agents in ephemeral sandboxes, expose tools via an MCP gateway, store org context in versioned repos + retrieval, meter cost per team, and audit every tool call.
The Interview Question
Design an internal AI coding agent platform for 1,000 engineers. Cover identity, sandboxes, MCP tool gateway, context stores, cost controls, and auditability.
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