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mcp-security-scanner

by badchars

rt_check_tool_poisoning

Scans MCP tool descriptions for prompt injection, detecting hidden instructions like file reads, exfiltration, override, and social engineering, then returns findings with pattern and severity.

Instructions

Analyze ALL tool descriptions for hidden prompt injection instructions. Checks for: file read instructions, exfiltration patterns, instruction override, system prompt extraction, social engineering. Returns findings with matched pattern and severity.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
commandYesServer command to execute (e.g. 'node', 'bun', 'npx')
argsNoCommand arguments (e.g. ['run', 'server.js'])
envNoAdditional environment variables
timeout_msNoConnection timeout in milliseconds (default: 30000)
tool_nameNoCheck only this tool (default: all tools)
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations present; description covers input and output but lacks details on side effects, resource usage, or whether it modifies state.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two efficient sentences conveying core purpose, patterns checked, and return format. No unnecessary words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Missing output schema; description provides minimal return details. No context on distinguishing from similar rt_check_* siblings. Adequate but not comprehensive.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with descriptions for all parameters. Description adds no new parameter information beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it analyzes tool descriptions for hidden prompt injection instructions, listing specific patterns checked. Distinct from sibling tools like rt_check_ansi_injection.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied as part of security auditing but no explicit when-to-use or when-not-to-use, nor alternatives provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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