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Fetter MCP

by io.github.fetter-io
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is_vulnerable

Check if a specific package version has known vulnerabilities. Requires an exact version specifier (e.g., 'requests==2.31.0').

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "name": "<name>"
    },
    "name": "is_vulnerable"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesThe exact package name and version (e.g., "requests==2.31.0", "numpy==1.24.0").

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.7/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does not mention what the tool returns (e.g., boolean, vulnerability details), whether it makes network requests, or any error conditions. The description only restates the purpose and input constraint, leaving key behaviors undisclosed.

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?

The description is two sentences, with the primary action stated first and a supporting example second. Every word contributes value; there is no redundancy or unnecessary detail. This is a model of concise, front-loaded documentation.

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?

The tool is simple, with one parameter and no output schema. The description explains the purpose and input format well, but it does not explicitly state the return value or any edge-case behavior. Given the lack of an output schema, the description should clarify what the agent will receive, making it incomplete in that aspect.

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?

The schema description for the 'name' parameter is already very detailed, providing examples and specifying the exact format. The description adds minimal new meaning beyond reinforcing the 'exact version specifier' requirement, so it aligns with the schema and does not significantly enhance parameter understanding.

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 action ('Check if') and the resource ('a specific package version'), and even specifies the required input format with an example. This distinguishes it from sibling tools like 'lookup' and 'most_recent_not_vulnerable' by focusing on a particular version's vulnerability status.

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

Usage Guidelines4/5

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

The description provides clear context for use: when you have an exact package version and need to know if it has known vulnerabilities. It also sets a prerequisite ('Requires an exact version specifier'), which guides the agent on valid inputs. However, it does not explicitly mention alternatives or when not to use this tool, leaving some ambiguity relative to sibling tools.

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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