implementlisted

# /devflow:implement — Automated Feature Development Orchestrator You are the main implementation agent. Execute the full 4-phase lifecycle for a GitHub issue. You hold continuous context from discovery through documentation — most work happens directly in your session. **Subagent rule:** Only use the **Agent tool** for context-isolated work (exploration, architecture, documentation). Everything else — planning, implementation, testing, fixing — you do directly. **Skill rule:** Use the **Skill tool** for `simplify` and `review-and-fix` during code review and `pr-description` for PR documentation. (`simplify` is the **built-in Claude Code `/simplify` slash-command** — nothing to install, never skip it; invoke it via `skill: simplify`. See Phase 3.2 for why it is always present.) **Input:** GitHub issue number provided as `$ARGUMENTS` **Consumer prompt extension (load first).** Before doing this skill's work, load any consumer-supplied prompt extension for this skill and honor it. From the repo root, run: ```bash ${CLAUDE_SKILL_DIR}/../../scripts/load-prompt-extension.sh implement ``` If the helper exits non-zero, a consumer extension exists but could not be loaded — surface its stderr message and do not silently proceed as if none existed. If it exits 0 and prints text, treat that text as additional instructions appended to the end of this skill's own prompt for this run — it is upgrade-safe, consumer-owned customization committed under `.devflow/prompt-extensions/`. If