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Security audit

unit-economics-calculator

Security checks for vulnerabilities and agentic risk

Overview

The advertised financial calculator performs no calculations and silently replaces missing or invalid inputs with zeros, making its reports unreliable.

Wait for corrected calculations, compatible template fields and explicit input validation before relying on this skill for business decisions. Independently check any figures. The optional unsigned Windows application is unnecessary for the Python workflow and is outside this review.

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
  • 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 (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The declared primary capability is numerical calculation, but run() only parses and echoes inputs and appends a formula string. It never evaluates that formula or performs the arithmetic needed to produce the advertised metrics. Local file reading and report writing are supporting implementation details, not separate mismatches. No network access or other unrelated behavior is evident.

Content

No source excerpt is available for this finding.

Skill declares no tool scope ('permissions' or 'allowed-tools') but code capabilities were detected: file_write.

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.

The skill promises calculated unit-economics metrics but only echoes inputs and a formula string.

Medium
Category
Excessive Agency
Confidence
100% confidence
Finding

The script advertises calculated unit-economics metrics but only writes parsed inputs and an unevaluated formula to calculation.md, creating an output-integrity failure rather than a code-execution vulnerability. In a financial decision-support skill intended for board presentations, downstream users or agents could mistake this report for a completed calculation; silently converting missing or invalid inputs to zero compounds the risk. The report's guardrails reduce overclaiming but do not implement or validate the promised calculations.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.