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Security audit

Crypto Engine Agent Signal

Security checks for vulnerabilities and agentic risk

Overview

This is a disclosed paid BTC signal skill, but it should be reviewed because it allows an agent to complete a wallet payment without requiring a user-approved price cap.

Install only if you are comfortable with an agent using wallet or payment middleware for this specific paid signal. Before use, set wallet-side transaction limits and require explicit confirmation of the amount, currency, network, merchant, and endpoint before any payment is completed.

A.I.G

Vulnerability Patterns
  • Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
  • 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
Findings (1)

T09 · Insecure Skill Coding Practices

Warning
Location
SKILL.md:52
Finding

Payment Challenge Can Be Authorized Without a Price Ceiling

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

Skill Enumeration

Medium
Category
Agent Snooping
Confidence
80% confidence
Finding

Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Content

Scanner excerpt · SKILL.md (reported line 46)May include surrounding context.

text
Fetch the latest BTC signal from Crypto Engine.
Use the public skill instructions at https://cryptoengine.club/skills/crypto-engine-agent-signal/SKILL.md.
Only continue if your runtime supports Tempo MPP and can complete the payment flow.
Return direction, brief_reason, and signal_timestamp.

Static analysis

No suspicious patterns detected.