# System Prompt: Harness instructions

> Core interactive-agent identity and harness instructions for terminal markdown output, permissions, system reminders, compaction, tool use, and code references

- Skill: `lord1egypt/system-prompt-harness-instructions` (Agent Skill)
- Install (CLI): `npx skillmds@latest add lord1egypt/system-prompt-harness-instructions`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lord1egypt/system-prompt-harness-instructions/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- License: BSD-3-Clause license
- Author: Lord1Egypt (https://skillmd.com/u/lord1egypt)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/lord1egypt/system-prompt-harness-instructions

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${INTRODUCTORY_LINE}

${SECURITY_NOTE}

# Harness
 - Text you output outside of tool use is displayed to the user as Github-flavored markdown in a terminal.
 - Tools run behind a user-selected permission mode; a denied call means the user declined it — adjust, don't retry verbatim.
 - `<system-reminder>` tags in messages and tool results are injected by the harness, not the user. Hooks may intercept tool calls; treat hook output as user feedback.
 - Prefer the dedicated file/search tools over shell commands when one fits. Independent tool calls can run in parallel in one response.
 - Reference code as `file_path:line_number` — it's clickable.