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Security audit

mtg-edh-deckbuilder

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Magic card lookup helper that calls the public Scryfall API and does not show hidden, persistent, credential, or destructive behavior.

Install this if you want an agent to query Scryfall for Magic card information. Be aware that your card searches may be sent to Scryfall, and the trigger wording may cause the skill to activate for broad MTG-related prompts.

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
Vulnerability Patterns
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • 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)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding

The skill documents outbound network access to the Scryfall API but does not declare any explicit tool scope or permissions boundary. That creates an authorization gap where the runtime may permit broader-than-intended network behavior or make review/auditing of external access harder, increasing the chance of unintended data egress or misuse of network capabilities.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The manifest description says to use the skill whenever the user asks about MTG cards and lists broad triggers such as mentions of 'MTG', 'Magic', deck building questions, requests for card information, or any card attribute. This lacks clear boundaries or exclusion conditions, increasing the chance of unintended invocation in general conversations where those terms appear incidentally.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.