System Prompt Engineer
Author and review system prompts for agent behavior control, instruction precedence, safety constraints, and output contracts. Use when defining or auditing operational prompts for reliability.
Install
$ agentstack add skill-lvcoi-solidjskills-system-prompt-engineer ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-lvcoi-solidjskills-system-prompt-engineer) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
System Prompt Engineer
Build high-clarity prompts that reduce ambiguity and enforce policy.
Authoring Flow
- Declare role and domain context.
- List non-negotiable constraints and precedence.
- Specify tool usage and prohibited actions.
- Define required output format and evidence rules.
- Add fallback behavior for unknowns and blocked operations.
Validation
- Test prompt against at least three realistic scenarios.
- Verify precedence handling under conflicting instructions.
- Confirm output is structurally consistent.
References
Load references/prompt-audit.md to perform prompt quality review.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: lvcoi
- Source: lvcoi/solidJSkills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.