ai-app-security-audit

name	ai-app-security-audit
description	Audit AI and LLM apps for concrete security, tool, prompt, key, cost, and supply-chain risks.

AI App Security Audit

Use this skill for security work specific to AI applications. It complements security-best-practices; do not replace framework security checks with this skill.

Core Rule

Only report findings with a concrete exploit path or concrete failure scenario. Do not list generic AI risks unless the current code, config, prompt flow, or architecture actually exposes them.

Scope

Audit these surfaces when present:

• Prompt assembly and role boundaries.
• User content flowing into system prompts, tool schemas, eval prompts, or agent instructions.
• Tool/function calling and argument validation.
• RAG ingestion, retrieval, citation, and source trust.
• LLM output parsing, schema validation, sanitization, and downstream execution.
• AI API keys, provider credentials, model routing, and proxy credentials.
• Cost, quota, retry, queue, and spend amplification controls.
• Agent memory, long-term context, uploaded files, browser sessions, and workspace access.
• Skill/plugin/agent supply chain, including local instructions that can run commands or read credentials.

Workflow

1. Map AI data flow.

   • Identify inputs: user text, files, URLs, database rows, RAG chunks, web pages, tool outputs.
   • Identify prompt construction: system, developer, user, tool, and hidden context.
   • Identify model calls and providers.
   • Identify tool calls, side effects, and output consumers.

2. Find trust boundary crossings.

   • Untrusted content entering privileged prompt positions.
   • Untrusted content shaping tool names, schemas, arguments, SQL, shell commands, file paths, URLs, or auth scopes.
   • Model output becoming executable code, HTML, SQL, shell, JSON instructions, or persisted state.

3. Check AI-specific risks.

   • Prompt injection that changes instructions or tool behavior.
   • RAG poisoning or untrusted retrieval content overriding app policy.
   • Tool call without schema validation, authorization, or allowlists.
   • Output parser trusting malformed, empty, hallucinated, or refusal responses.
   • Missing rate limits, retry caps, token caps, queue caps, or budget limits.
   • Secrets exposed through logs, traces, prompts, eval fixtures, screenshots, or tool results.
   • Cross-user memory or document leakage.
   • Unsafe browser, filesystem, terminal, or SaaS-account actions.

4. Verify before reporting.

   • Quote the exact file and line when possible.
   • Explain attacker control, trust boundary, exploit path, impact, and why existing controls do not block it.
   • If confidence is below 8/10 for a normal audit, mark it as Needs verification instead of a finding.

5. Produce fixes or a report depending on the user's request.

   • For a report-only audit, do not edit files.
   • For fix work, address one finding at a time and run the relevant tests.

False Positive Rules

• User content in a normal user-message position is not prompt injection by itself.
• A model returning wrong prose is not a security issue unless it crosses into privileged action, data exposure, fraud, compliance, or cost impact.
• Missing HSTS, TLS, or generic web headers belongs in security-best-practices, not this skill, unless directly tied to AI credential or data exposure.
• A theoretical jailbreak is not reportable without an app-specific path to data, tools, cost, or policy bypass.

Report Contract

Use this structure:

## AI App Security Audit

### Executive Summary
Overall risk:
Audit scope:
Confidence:

### AI Data Flow
Inputs:
Prompt assembly:
Model calls:
Tool calls:
Stored outputs/memory:

### Findings

#### AI-SEC-001: <title>
Severity: Critical / High / Medium / Low
Confidence: 8/10+
Evidence: <file:line>
Attacker control:
Trust boundary crossed:
Exploit path:
Impact:
Existing controls:
Recommended fix:
Validation:

### Needs Verification
- Items with plausible risk but insufficient proof.

### Not In Scope
- Security areas intentionally left to other skills or audits.

Severity Guide

• Critical: secret exfiltration, cross-tenant data exposure, arbitrary tool execution, irreversible external side effects, or uncontrolled spend.
• High: prompt/tool/RAG path that can access sensitive data, perform unauthorized writes, or materially bypass policy.
• Medium: validated but bounded risk with limited data/action/cost impact.
• Low: evidenced hardening issue with a concrete failure scenario but no immediate exploit path.