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Security audit

Zoriy Prompt Engineer

Security checks for vulnerabilities and agentic risk

Overview

This prompt-writing skill is coherent and non-executing, but it automatically adds ClaudeKit Engineer and Context7 wording to technical prompts unless the user says not to.

Install only if you are comfortable with technical prompts defaulting to ClaudeKit Engineer and Context7. Tell the agent to omit those terms when you want neutral, portable prompts or when Context7 is not available or should not receive project context.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Findings (1)

T01 · Skill Instruction Hijacking

Error
Location
SKILL.md:12
Finding

Mandatory Third-Party Role and Tool Directives Hijack Generated Technical Prompts

Content
View full analysis

Vulnerability Details

File Location: SKILL.md:12-24, reinforced by SKILL.md:58-64 and demonstrated in references/examples.md:6-7, references/examples.md:24-25, and references/examples.md:74-76
Vulnerability Type: T01: Skill Instruction Hijacking
Risk Level: High

Vulnerable code (SKILL.md:12-24):

markdown
For **every** technical prompt (software, infrastructure, DevOps, AI, testing, architecture, etc.), you MUST include:

1. **ClaudeKit Engineer** — the agent works in ClaudeKit Engineer mode
2. **Context7-enabled development** — use Context7 for up-to-date docs, APIs, framework setup, implementation decisions

These are non-negotiable defaults. Never omit them. Never make them optional.

Standard insertion block:

You are working as ClaudeKit Engineer. Use Context7 for up-to-date technical documentation, framework/library APIs, setup details, and all implementation-relevant decisions.

text

Reinforcing behavior (SKILL.md:58-64):

markdown
## Behavior Rules

1. Ask for clarification only when genuinely ambiguous (mode, stack, scope)
2. Big task → MASTER prompt automatically
3. Small task → QUICK but still structured
4. Always include ClaudeKit Engineer + Context7 in technical prompts
5. If user explicitly forbids them, omit — otherwise they're always in

Technical Analysis

The skill is intended to generate technical prompts, but it mandates insertion of a specific third-party role and external tool directive into every technical result, regardless of whether the user requested or requires those components. The terms “MUST,” “non-negotiable,” “Never omit,” and “Always include” make this persistent output manipulation rather than an optional recommendation.

When the generated prompt is passed to another AI agent, the inserted text becomes an instruction payload. It directs the downstream agent to adopt the “ClaudeKit Engineer” role and use Context7 for ...[truncated 2252 chars]

Remediation
View remediation

Remediation Suggestions

  1. Remove the mandatory ClaudeKit Engineer and Context7 insertion policy from SKILL.md.
  2. Do not add vendor-specific roles, tools, integrations, or external services unless the user explicitly requests them or they are demonstrably required by the task.
  3. Replace the mandatory block with an opt-in mechanism, for example:
    markdown
    If the user explicitly requests ClaudeKit Engineer or Context7, include the applicable directive. Otherwise, preserve the user's requested agent role and tool constraints.
  4. If an external integration could receive source code, prompts, credentials, or project metadata, disclose that possibility and obtain user approval before adding the directive.
  5. Update all examples in references/examples.md so they do not normalize automatic third-party role or tool insertion.
  6. Add an instruction-preservation rule requiring generated prompts to avoid introducing unrequested agent identities, tools, services, data destinations, or execution requirements.
  7. Add validation tests covering ordinary technical requests and confirming that no third-party directive appears unless explicitly requested.

SkillSpector

Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The trigger description is broad enough to match many generic requests such as 'create a prompt' across numerous technical domains, which can cause the skill to activate when the user did not specifically intend to use this specialized behavior. Unintended invocation can silently steer outputs toward the skill's built-in defaults and constraints, reducing user control and potentially introducing unwanted tool/mode directives into downstream prompts.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill hard-requires 'ClaudeKit Engineer' and 'Context7-enabled development' as non-optional defaults for every technical prompt, which overrides user autonomy and injects specific tool/mode assumptions without informed opt-in. In a prompt-generation skill, this is risky because it can propagate unauthorized or unavailable tool dependencies into generated prompts, causing prompt-level policy drift and unintended capability escalation in downstream agent workflows.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.