Prompt Failure Mode Auditor
Hardens AI prompts and agent workflows against logic errors, tool-misuse, and prompt injection.
- Identify prompt injection risks and untrusted content vulnerabilities.
- Audit tool-calling boundaries for destructive or high-cost API actions.
- Generate a failure-mode matrix with severity ratings and specific fixes.
Free
Sample input
Audit this customer support agent prompt. It has access to a 'refund_customer' tool and 'read_order_history'. It keeps getting tricked into giving refunds for non-existent orders.
Sample output
Findings
| Severity | Issue | Fix |
| --- | --- | --- |
| High | No Order Validation | Require read_order_history confirmation before calling refund. |
| Med | Identity Spoofing | Verify customer_id against auth context, not user-provided text. |
Safer Rewrite
[Optimized instructions provided...]
Prompt Failure Mode Auditor
Hardens AI prompts and agent workflows against logic errors, tool-misuse, and prompt injection.
Free
Included in download
- Downloadable skill package
- Instant install
Sample input
Audit this customer support agent prompt. It has access to a 'refund_customer' tool and 'read_order_history'. It keeps getting tricked into giving refunds for non-existent orders.
Sample output
Findings
| Severity | Issue | Fix |
| --- | --- | --- |
| High | No Order Validation | Require read_order_history confirmation before calling refund. |
| Med | Identity Spoofing | Verify customer_id against auth context, not user-provided text. |
Safer Rewrite
[Optimized instructions provided...]
About This Skill
Secure and Optimize Your AI Agent Workflows
Deploying AI agents without a rigorous audit is a recipe for prompt injection, unintended tool execution, and "hallucinated" permissions. The Prompt Failure Mode Auditor acts as a professional security and logic review layer for your AI instructions and tool-calling workflows.
What it does
This skill systematically analyzes your prompts and agent instructions to find architectural weaknesses. It doesn't just look for typos; it investigates:
- Logical Contradictions: Conflicting priorities that cause agent loops or inconsistent behavior.
- Tool Boundaries: Vulnerabilities in how the agent handles destructive actions, payments, or private data through connected APIs.
- Injection Risks: How untrusted user input might hijack the agent's core instructions.
- Brittle Assumptions: Missing input requirements that lead to failure when data is incomplete.
Why use this skill?
Manually testing every edge case is impossible. This skill provides a structured Failure Mode Matrix and Evaluation Cases that you can use for automated or manual testing. It concludes with a production-ready rewrite of your prompt, implementing defensive engineering patterns that are difficult to write from scratch.
The Result
You receive a detailed report identifying severity-rated risks, a hardened version of your prompt, and 5-10 specific evaluation scenarios to ensure your agent stays within its sandbox.
Use Cases
- Identify prompt injection risks and untrusted content vulnerabilities.
- Audit tool-calling boundaries for destructive or high-cost API actions.
- Generate a failure-mode matrix with severity ratings and specific fixes.
- Produce 5-10 manual evaluation cases to stress-test agent behavior.
- Rewrite brittle prompts into hardened, production-ready instructions.
Known Limitations
- Focused on prompt logic, not code-level sandbox security.
- Evaluation scenarios require manual or external execution.
- Effectiveness depends on model reasoning capabilities.
How to Install
mkdir -p ~/.claude/skills && curl -sL https://www.agensi.io/api/install/prompt-failure-mode-auditor -o /tmp/prompt-failure-mode-auditor.zip && unzip -o /tmp/prompt-failure-mode-auditor.zip -d ~/.claude/skills && rm /tmp/prompt-failure-mode-auditor.zipFree skills install directly. Paid skills require purchase - use the download button above after buying.
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Compatible with SKILL.md-compatible agents
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