Stripe Minions Blueprint Architecture: Deterministic Context Prefetching + Toolshed MCP (400 Tools) Curates ~15 Surgical Tools Per Run

Stripe Engineering Blog·high signal

Stripe's Part 2 engineering blog reveals the architecture behind 1,300+ weekly merged PRs. Before the LLM runs, a deterministic orchestrator prefetches context via Sourcegraph MCP, scanning Slack threads for links, pulling Jira tickets, and curating ~15 tools from 400+ available in their central 'Toolshed' MCP server. Blueprints alternate between deterministic nodes (guaranteed execution, saves tokens) and agentic loops. Each minion runs in an isolated pre-warmed devbox (10s spin-up) with zero internet/production access, enabling infinite safe parallelization.