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Security audit

Signal Detector

Security checks for vulnerabilities and agentic risk

Overview

This note-taking skill is coherent, but it would automatically save exact wording from most user messages into persistent notes, so it needs review before installation.

Install only if you intentionally want ambient knowledge capture across conversations. Before using it with sensitive work, confirm where notes are stored, who can access them, how to disable capture, how to delete captured entries, and whether exact quotes can be replaced with summaries or redacted by default.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (5)

Missing User Warnings

High
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill is explicitly designed for always-on capture of inbound user messages and describes logging/capture behavior without any user-facing notice, consent, or privacy boundary. Because it operates ambiently and persistently, users may disclose sensitive personal, business, or credential-adjacent information that is then retained unexpectedly.

Content

No source excerpt is available for this finding.

Ssd 3

High
Category
Not specified by scanner
Confidence
99% confidence
Finding

The skill mandates collection from every substantive user message, in parallel, with exact phrasing and provenance, which amounts to broad surveillance-style harvesting of natural-language content. In context, this is more dangerous because it is silent, continuous, and framed as non-blocking background behavior, making overcollection and unnoticed retention very likely.

Content

No source excerpt is available for this finding.

Missing User Warnings

High
Category
Not specified by scanner
Confidence
98% confidence
Finding

These instructions direct the agent to write user-derived content into notes, project indexes, dashboards, or the knowledge base, creating persistent storage of user messages and inferred ideas. Persisting exact user phrasing and cross-linked facts without warning or consent materially increases privacy, confidentiality, and downstream disclosure risk.

Content

No source excerpt is available for this finding.

Ssd 3

High
Category
Not specified by scanner
Confidence
98% confidence
Finding

The required output format logs exact quoted user phrasing, encouraging verbatim retention of potentially sensitive statements, secrets, regulated data, or proprietary ideas. Quoted logging also increases the chance that confidential content is later surfaced through search, sharing, sync, backups, or other downstream knowledge-base operations.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 79)May include surrounding context.

md
- Paraphrasing or smoothing the user's language — keep the original voice
- Blocking the main conversation to finish capture — spawn or defer
- Creating knowledge pages for every passing mention — apply the notability gate
- Over-writing existing knowledge base material without checking what's there first
- Capturing purely operational exchanges as signal

Static analysis

No suspicious patterns detected.