A bash tool: capture stdout, stderr, exit code · Harness engineering

Forward-deployed / Learning zone

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← Track overview

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

A bash tool: capture stdout, stderr, exit code Timeouts & killing runaway processes Background tasks & long-running commands Working-directory & shell-state pitfalls Sandboxing: containers, namespaces, seccomp Network policies & egress control

Phase 08 — Permissions & safety gating

Phase 09 — Memory & persistence

Phase 10 — Subagents & orchestration

Phase 11 — Planning & task management

Phase 12 — MCP & extensibility

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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