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mastyf-ai

mastyf-ai

Official

scan_response_dlp

Scans MCP tool responses to detect and prevent data leaks of PII, credentials, sensitive paths, and exfiltration.

Instructions

Scan MCP tool responses for PII, credentials, sensitive paths, and data exfiltration

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
toolNameNoTool name that produced the response
serverNameNoServer name
responseTextYesThe response text to scan for data leaks
Behavior2/5

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

No annotations provided, so the description carries the full burden. It only lists scan targets but does not disclose whether the tool is read-only, what it returns (e.g., boolean, report), or any side effects. Missing behavioral traits.

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?

Single sentence, front-loaded with verb 'Scan', no extra words. Efficient and clear.

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?

For a scanning tool without output schema or annotations, the description should explain what the result looks like (e.g., scan report, alert). It only lists scan categories but omits output format and any prerequisites.

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 baseline is 3. Description adds no parameter-specific details beyond what the schema provides (toolName, serverName, responseText). It does not clarify the role of toolName or serverName in scanning.

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?

Description clearly specifies the tool's function: scanning MCP tool responses for PII, credentials, sensitive paths, and data exfiltration. This distinguishes it from sibling tools like scan_prompt_injection which targets prompts, and scan_security which may have a broader scope.

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?

No explicit guidance on when to use this tool versus alternatives. The purpose implies it's for data loss prevention on responses, but no mention of when not to use or when to prefer siblings.

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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