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Security audit

Jsonlint

Security checks for vulnerabilities and agentic risk

Overview

This is a local JSON utility that reads user-chosen JSON files and prints validation, formatting, comparison, or extraction output without hidden network access or persistence.

Install this only if you want a terminal JSON helper that can read and print the contents or selected values from files you name. Avoid running it on sensitive JSON files unless you are comfortable with those values appearing in terminal output or logs.

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

SkillSpector

Vulnerability Patterns
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • 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)

Tp4

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The code does include the declared capabilities of validating JSON and pretty-printing it. However, its actual functionality is materially broader than the description. It implements several additional JSON inspection and transformation features: minification, structural diffing between two files, listing keys with previews/types, and extracting nested values by path. These are undeclared capabilities and make the skill a more general JSON toolkit rather than only a validator/pretty-printer. There is no evidence of unrelated network access, exfiltration, or dangerous side effects; the mismatch is due to under-described functionality.

Content

No source excerpt is available for this finding.

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
70% confidence
Finding

Without declared permissions the skill's intent is opaque and cannot be validated.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.