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Security audit

BTW Coach

Security checks for vulnerabilities and agentic risk

Overview

This is a disclosed writing-coach skill that comments on phrasing and tone, with no code, tools, persistence, or external data access.

Install this only if you want proactive English phrasing and tone tips appended to normal replies. Users who do not want unsolicited writing feedback, especially across all conversations, should leave it disabled or use it only in a writing-help context.

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
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

High
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill is configured to run on every user message, which creates continuous unsolicited behavioral analysis of user inputs. Even though the feature is framed as coaching, this broad trigger increases privacy and UX risk, can surface unwanted tone-policing, and makes accidental activation far more likely across sensitive or inappropriate contexts.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The skill’s stated purpose is to proactively correct English phrasing and politeness without user opt-in, which imposes English-centric norms on all users by default. This can lead to biased or unwelcome corrections, especially for non-native speakers or users who did not request language coaching, and may degrade trust or disproportionately affect certain groups.

Content

No source excerpt is available for this finding.