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mcp-security-scanner

by badchars

rt_check_callbacks

Analyzes MCP server tool schemas for callback and webhook URL parameters that lack constraints, identifying potential SSRF vulnerabilities.

Instructions

Analyze tool schemas for callback/webhook URL parameters that could enable SSRF. Checks parameter names (callback, webhook, redirect, return_url, notify_url, hook_url, etc.) and whether URL constraints (enum, pattern, format) are applied. Also scans descriptions for callback URL acceptance patterns.

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?

With no annotations, the description should disclose behavioral traits. It describes what is checked but does not state it is non-destructive, nor describe output format or side effects. Adequate but could be more explicit.

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 concise sentences that front-load the purpose. Every word adds value; no wasted text.

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

Completeness2/5

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

Lacks description of output format or return value, which is needed since no output schema is provided. Given the tool is a check, the agent needs to know what the result looks like (e.g., list of findings). Incomplete.

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 descriptive property descriptions. The description adds no additional meaning to the parameters, which are about server connection, not the SSRF check itself. Baseline 3 applies.

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 it analyzes tool schemas for callback/webhook URL parameters that could enable SSRF, naming specific parameter patterns. This distinguishes it from sibling tools like sast_ssrf which checks general SSRF.

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 implies usage for SSRF checks via callbacks, but does not explicitly state when to use this over alternatives (e.g., sast_ssrf). No when-not-to-use or prerequisites are mentioned.

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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