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Security audit

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Security checks for vulnerabilities and agentic risk

Overview

This Pomodoro skill is a simple terminal timer with disclosed optional local notification and session logging behavior.

Before installing, be aware that notifications rely on macOS osascript and the optional logging command stores focus-session timestamps in ~/pomodoro.log. Avoid using the logging command if you do not want that local activity trail.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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)

Context-Inappropriate Capability

Low
Confidence
78% confidence
Finding
The stated purpose is to run timed focus sessions from the terminal, but the implementation also invokes a platform-specific GUI notification mechanism through osascript. While related to timer completion, this is an extra execution capability not clearly justified by the narrow manifest wording.

Description-Behavior Mismatch

Low
Confidence
87% confidence
Finding
The manifest frames the skill as a terminal timer for Pomodoro sessions, which implies running timers and displaying status, but this section adds persistent file-writing behavior by appending to ~/pomodoro.log. Logging may be useful, yet it expands the behavior beyond the narrow description of simply running timed focus sessions.

Missing User Warnings

Low
Confidence
94% confidence
Finding
The skill writes persistent activity data to ~/pomodoro.log without warning in the manifest or description, which can surprise users and create an unintended privacy trail of work habits and timestamps. While low severity, undisclosed persistence is security-relevant because it stores behavioral metadata in the home directory that other local processes or users may later access.

Static analysis

No suspicious patterns detected.