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Harness engineering
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Phase 00 — Setup & tooling
Phase 01 — LLM I/O foundations
Phase 02 — The agent loop
Phase 03 — Tool engineering
Phase 04 — Context engineering
Phase 05 — Prompt & instruction architecture
Phase 06 — File & code operations
Phase 07 — Shell & sandbox execution
Phase 08 — Permissions & safety gating
Phase 09 — Memory & persistence
Phase 10 — Subagents & orchestration
Phase 11 — Planning & task management
Phase 12 — MCP & extensibility
The MCP wire protocol from scratch
An MCP server: tools, resources, prompts
An MCP client & tool discovery
Skills (SKILL.md) & progressive disclosure
Plugins & deferred tool loading
Use it: the official MCP SDK
Phase 13 — Retrieval & codebase understanding
Phase 14 — Reliability engineering
Phase 15 — Evals & testing the harness
Phase 16 — Observability & cost
Phase 17 — Security & alignment
Phase 18 — Production & deployment
Phase 19 — Capstone: build your own coding agent
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Forward-deployed
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