T01 · Skill Instruction Hijacking
Error
- Location
SKILL.md:20- Finding
Mandatory Model Delegation Enables Skill Instruction Hijacking
- Content
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If anything will be executed, or the outcome matters, escalate. ## When to Escalate → MUST call sessions_spawn If the task matches ANY of the following, do NOT answer yourself. Instead, IMMEDIATELY call: ``` sessions_spawn( message: "", model: "gpt-5.3-codex", label: "" ) ``` ``` ### Technical Analysis The skill imposes mandatory, session-wide behavioral instructions rather than offering optional model-routing guidance. It directs the agent to classify every request before responding, forbids the current agent from answering requests that match broad conditions, and requires immediate invocation of `sessions_spawn`. The escalation criteria elsewhere in the same file cover tool execution, code changes, security analysis, structured reports, uncertainty, complex reasoning, and other common activities. Consequently, most meaningful tasks can be redirected. The skill also instructs the agent to forward the “full task description,” without requiring user consent, content minimization, or a check for sensitive information. The frontmatter states that its description is injected into the system prompt, making these behavioral directives active when the skill is loaded. This allows the skill text to alter the current session’s decision-making and tool-use flow. No operating-system privilege escalation ...[truncated 1743 chars]- Remediation
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