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10 universal patterns for building CLI tools that AI agents can use reliably: non-interactive, --json, --dry-run, idempotent, lazy auth, progressive help, and more. Includes a bash scaffold template, Python API client reference, advanced edge-case patterns, MCP-vs-CLI decision framework, and an improvement cycle for iterating on shipped tools. Principles grounded in real failures from building 15+ agent-facing CLIs across multiple API services. Signed-off-by: Jasper <magnus@groktop.us>