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Security audit

Brainstorm Beagle

Security checks for vulnerabilities and agentic risk

Overview

This is a coherent spec-brainstorming skill, but it can inspect the workspace and create a git commit without prominent, separate user consent.

Install only if you are comfortable with a brainstorming skill reading broad repository context and saving specs under .beagle. Before use, treat any git commit as requiring explicit approval: ask the agent to show the target path and diff, and to skip committing unless you specifically request it.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • 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
Findings (7)

Description-Behavior Mismatch

High
Category
Not specified by scanner
Confidence
98% confidence
Finding

The skill claims it only produces a spec and does not take implementation action, but later instructs the agent to write files to disk and create a git commit. That mismatch can mislead users and higher-level orchestrators about the skill's side effects, enabling unexpected state changes in the workspace and repository.

Content

No source excerpt is available for this finding.

Context-Inappropriate Capability

High
Category
Not specified by scanner
Confidence
97% confidence
Finding

Automatically committing to git is a high-impact side effect that is not necessary for brainstorming/spec generation and can permanently alter project history. If invoked unexpectedly or on sensitive repositories, it could create unwanted commits, leak generated content into version control, or interfere with existing workflows and approvals.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The trigger phrases are broad enough that the skill may activate for generic brainstorming or project-help requests outside its intended scope. Because this skill can inspect the repository, write files, and even commit to git, overbroad activation increases the chance of unintended side effects from an imprecise user request.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
84% confidence
Finding

The stated purpose is a dialogue-centered brainstorming/spec skill that does not plan or implement. Yet the workflow includes reading project files, docs, git history, running a repo-wide prior-art sweep, and potentially invoking web-research or artifact-analysis, which materially expands the behavior from conversational clarification into repository investigation and external research orchestration.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
92% confidence
Finding

The skill description presents the tool as producing a spec through dialogue, but does not upfront warn that it may write files and persist artifacts. Missing disclosure undermines informed consent and can cause users to invoke the skill without realizing it will modify the workspace.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

Committing to git without a clear user-facing warning is especially dangerous because it creates durable repository state and may trigger downstream automation, review noise, or accidental disclosure through later pushes. The absence of prominent disclosure makes the side effect surprising and harder for users to control.

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 · references/spec-reviewer.md (reported line 108)May include surrounding context.

md
**Only fix issues that would cause real problems downstream.**

A downstream planning system acting on this spec should be able to:
- Understand what to build without asking the user again
- Decompose requirements into tasks
- Know what's in scope and what's not
- Understand the constraints they're working within

Static analysis

No suspicious patterns detected.