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Security audit

breakup-buddy

Security checks for vulnerabilities and agentic risk

Overview

This is a local breakup logistics organizer, but its final report can miscalculate non-50/50 expense splits, so users should review settlement numbers carefully.

Use this only as a local organizer, keep the untangle.json file private, and do not rely on the report's expense summary when any expense uses a custom share such as 60/40; run the dedicated expense settle command and verify the numbers manually before using them in an agreement.

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)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
93% confidence
Finding

The skill describes persistent local storage in untangle.json and operational commands that read and write user data, but it does not declare any explicit tool scope or permissions boundaries. In a security-sensitive context involving highly personal relationship, financial, and account data, undeclared file read/write capability increases the risk of overbroad filesystem access, unintended data exposure, or writes outside the expected working file.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The tool advertises a single accurate settle-up flow, but report computes expense netting with a hardcoded 50/50 split while expense settle honors per-expense share ratios. This can misstate who owes whom in a high-stress financial separation context, leading users to rely on an incorrect final payment summary and potentially causing financial loss or disputes.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.