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mcp-security-scanner

by badchars

rt_check_resource_exposure

Enumerates MCP resources and prompts to flag broad URI patterns, sensitive paths, and social engineering risks.

Instructions

Enumerate all MCP resources and prompts exposed by the server. Flag resources with broad URI patterns (file://, https://), resources exposing sensitive paths, and prompts that could be used for social engineering.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
envNoAdditional environment variables for stdio
urlNoMCP server URL for HTTP/SSE transport (e.g. 'http://localhost:3000/mcp')
argsNoCommand arguments for stdio (e.g. ['run', 'server.js'])
commandNoServer command for stdio transport (e.g. 'node', 'bun', 'npx')
headersNoCustom HTTP headers (e.g. { 'Authorization': 'Bearer token' })
timeout_msNoConnection timeout in milliseconds (default: 30000)
Behavior3/5

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

No annotations are provided. The description discloses the tool enumerates and flags but does not mention side effects, authentication requirements, or whether it modifies state. Safe operation is implied but not confirmed.

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 sentences, front-loaded with the main action, no wasted words. Efficiently conveys purpose and key behaviors.

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?

Without an output schema, the description does not explain the return format or structure of flagged issues. The agent lacks information on how to interpret results, which is important for an enumeration tool.

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%, so the schema already documents all 6 parameters. The description adds no additional meaning or usage hints for parameters (e.g., which to set for typical scans). Baseline 3 is appropriate.

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?

The description clearly states the tool enumerates MCP resources and prompts and flags specific patterns (broad URIs, sensitive paths, social engineering). This distinguishes it from sibling tools like rt_check_auth or rt_check_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?

The description does not explicitly state when to use this tool over alternatives. It implies usage for resource exposure checks, but lacks direct guidance on context or exclusions like 'use instead of rt_* tools for resource-specific audits'.

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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