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orcohen5

Vulnerability Registry MCP Server

by orcohen5

Vulnerability Registry MCP Server

Author: Or Cohen

An MCP (Model Context Protocol) server that wraps a legacy vulnerability database and exposes it as tools for any MCP-compatible LLM client. Built as a smart access layer over custom pipe-delimited data files, enabling security analysts to query vulnerabilities using natural language.

Quick Start

Prerequisites

  • Node.js 18+

  • Claude Desktop (or any MCP-compatible client)

Setup

git clone https://github.com/orcohen5/vulnerability-registry.git
cd vulnerability-registry
npm install
npm run build

Connect to Claude Desktop

Add to your Claude Desktop config (%APPDATA%\Claude\claude_desktop_config.json on Windows, ~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "vulnerability-registry": {
      "command": "node",
      "args": [
        "<FULL_PATH>/vulnerability-registry/dist/index.js",
        "<FULL_PATH>/vulnerability-registry/data"
      ]
    }
  }
}

Replace <FULL_PATH> with the absolute path to the cloned repository.

Restart Claude Desktop, then ask:

"What MCP tools do you have for vulnerabilities?"

Tool Discovery Claude Desktop discovering all 6 vulnerability registry tools

Related MCP server: pentestMCP

Available Tools

Tool

Description

Key Parameters

Example Query

list_vendors

List all registered software vendors

category (optional)

"Show me all open source vendors"

get_vendor

Find a vendor by ID or name

vendor_id, name

"Find the vendor ID for Linux Kernel"

search_vulnerabilities

Search with flexible filters

severity, status, min_cvss, keyword, published_after

"Show critical open vulnerabilities"

get_vulnerability

Get full CVE details

cve_id

"What is the CVSS score of Log4Shell?"

get_vulnerability_stats

Aggregate statistics

vendor_id (optional)

"How many vulnerabilities by severity?"

get_vendor_risk_summary

Vendor risk profile

vendor_id

"Show me Microsoft's risk profile"

Example Queries

"How many critical vulnerabilities are still open?"

Uses search_vulnerabilities with severity: "critical" and status: "open".

Critical Open Vulnerabilities

"What is the CVSS score of Log4Shell?"

Uses get_vulnerability with cve_id: "CVE-2021-44228".

Log4Shell CVSS

"Show me the risk profile for Microsoft"

Uses get_vendor_risk_summary with vendor_id: "V1".

Microsoft Risk Profile

"Which vulnerabilities were found in Linux Kernel after 2022?"

This query demonstrates multi-tool orchestration — Claude first calls list_vendors to resolve "Linux Kernel" to vendor ID V5, then calls search_vulnerabilities with vendor_id: "V5" and published_after: "2022-01-01".

Linux Kernel Multi-Tool Query

Architecture

┌─────────────────┐     ┌──────────────┐     ┌──────────────┐
│  Claude Desktop │────▶│  MCP Server  │────▶│  Data Files  │
│  (MCP Client)   │◀────│  (stdio)     │◀────│  (.db)       │
└─────────────────┘     └──────┬───────┘     └──────────────┘
                               │
                    ┌──────────┼──────────┐
                    ▼          ▼          ▼
               tools.ts   repository.ts  parser.ts
              (MCP layer)  (query engine) (file reader)

The codebase follows a strict three-layer separation:

  • parser.ts — Reads the custom pipe-delimited format dynamically. Knows nothing about MCP.

  • repository.ts — In-memory data store with indexed Maps for O(1) lookups. Knows nothing about MCP.

  • tools.ts — Registers MCP tools using the high-level McpServer API. Translates between MCP and the repository.

This means swapping the data source (files → database) requires changing only parser.ts, with zero changes to the MCP layer.

Design Decisions

Dynamic metadata parsing — The file parser reads column names from the # FORMAT: header at runtime rather than hardcoding field positions. Combined with version checking (# VERSION: 1.0), this ensures the server can detect and warn about format changes without code modifications.

Repository pattern with in-memory indexing — Data is loaded once at startup and indexed into multiple Maps (vendorById, vulnByCveId, vulnsByVendor, vulnsBySeverity, vulnsByStatus). Primary lookups are O(1). Filtered searches start from the smallest indexed subset and intersect, making combined queries efficient even at scale.

High-level McpServer API — Uses McpServer.registerTool() with Zod schemas for type-safe input validation, rather than the low-level Server class with manual JSON Schema definitions and request routing.

Flexible search with optional filterssearch_vulnerabilities accepts all parameters as optional, allowing any combination. One tool handles queries from "show all critical" to "find Linux CVEs from 2023 with CVSS above 8". Results are always sorted by CVSS score (highest first) so the most severe issues appear first.

Enriched responsesget_vulnerability returns the full vendor object alongside the CVE data. get_vendor_risk_summary includes the list of open vulnerabilities. This reduces the number of tool calls the LLM needs to answer common questions.

Strict type safetySeverity and Status are union types derived from as const arrays, with runtime type guards (isSeverity, isStatus). The same source-of-truth arrays feed both TypeScript types and Zod enum validators.

Known Data Anomalies

While working with the source data files, I identified at least one attribution inconsistency: CVE-2024-21762 (Fortinet SSL VPN OOB) is mapped to vendor V4 (Google) in vulnerabilities.db, although this is a Fortinet vulnerability. The server faithfully returns the data as stored — correcting source data is out of scope for a read-only query layer. In a production system, I would add a data validation step at load time to flag such inconsistencies for human review, possibly by cross-referencing the NVD API for canonical vendor attribution.

What I'd Build With More Time

  • SQLite/PostgreSQL persistence — Replace in-memory storage for datasets that exceed available RAM, with connection pooling for concurrent access.

  • Pagination — Add limit/offset parameters to search_vulnerabilities for large result sets.

  • Fuzzy text search — Levenshtein distance matching on vulnerability titles for typo-tolerant queries.

  • NVD API integration — Automatic CVE data updates from NIST's National Vulnerability Database.

  • MCP Resources — Expose raw data files as MCP Resources for direct LLM access when full-text context is needed.

  • Structured logging & observability — JSON-formatted logs with correlation IDs for debugging tool call chains.

  • Authentication & rate limiting — Protect the server in shared deployment scenarios.

  • CI/CD pipeline — GitHub Actions running lint, type-check, and tests on every push.

Tech Stack

Component

Choice

Language

TypeScript (ES2022, Node16 modules)

MCP SDK

@modelcontextprotocol/sdkMcpServer high-level API

Validation

Zod

Transport

stdio

Build

tsc

Tests

Vitest

Testing

npm test        # Run all tests (30 tests across parser + repository)
npm run build   # Compile TypeScript
npm start       # Start the MCP server (stdio mode)

Available Tools

6 tools
get_vendorGet VendorA

Get details about a specific vendor by their ID (e.g. 'V1') or by name (case-insensitive partial match, e.g. 'linux' will match 'Linux Kernel Organization'). Use this to find a vendor's ID before querying their vulnerabilities.

ParametersJSON Schema
NameRequiredDescriptionDefault
vendor_idNoVendor ID, e.g. 'V1', 'V2'
nameNoFull or partial vendor name, case-insensitive

TDQS

A3.9/5.0
Behavior3/5

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 adds useful context about case-insensitive partial matching and the purpose of finding IDs for vulnerability queries, but it does not cover other behavioral aspects like error handling, rate limits, or authentication needs, leaving some gaps in transparency.

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 appropriately sized and front-loaded, with two sentences that efficiently convey the tool's purpose, usage method, and context without any wasted words, making it easy for an agent to parse and understand quickly.

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?

Given the tool's moderate complexity (2 parameters, no output schema, no annotations), the description is adequate but has gaps. It explains the purpose and usage well but lacks details on behavioral traits like error responses or performance, which could be important for an agent to invoke it correctly in varied scenarios.

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 coverage is 100%, so the schema already documents both parameters thoroughly. The description adds minimal value by reinforcing the use of ID or name with examples, but it does not provide additional syntax or format details beyond what the schema specifies, aligning with the baseline for high coverage.

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's purpose with a specific verb ('Get details') and resource ('about a specific vendor'), and distinguishes it from siblings by mentioning its use for finding vendor IDs before querying vulnerabilities, which differentiates it from tools like 'get_vulnerability' or 'list_vendors'.

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 on when to use this tool (to find a vendor's ID before querying vulnerabilities) and how to use it (by ID or name with partial matching), but it does not explicitly state when not to use it or name specific alternatives among the sibling tools, such as 'list_vendors' for broader listings.

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

get_vendor_risk_summaryGet Vendor Risk SummaryA

Get a comprehensive risk profile for a specific vendor. Shows total vulnerabilities, open vs patched breakdown, severity distribution, highest CVSS score, and lists all currently open vulnerabilities. Ideal for vendor risk assessment.

ParametersJSON Schema
NameRequiredDescriptionDefault
vendor_idYesVendor ID to analyze, e.g. 'V1' for Microsoft

TDQS

A4/5.0
Behavior3/5

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 describes the output content (risk profile with breakdowns, lists open vulnerabilities) but does not cover other behavioral aspects such as permissions needed, rate limits, error handling, or data freshness. It adequately conveys it's a read operation but lacks deeper context.

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 front-loaded with the core purpose in the first sentence, followed by specific details and usage context in two concise sentences. Every sentence adds value: the first defines the tool, the second enumerates output components, and the third provides usage guidance, with no wasted words.

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

Completeness4/5

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

Given the tool's complexity (risk profiling with multiple metrics) and lack of annotations and output schema, the description does a good job explaining what the tool returns (breakdowns, severity, CVSS score, open vulnerabilities list). However, it could be more complete by detailing the output format or structure, which is missing since there's no output schema.

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 coverage is 100%, with the parameter 'vendor_id' fully documented in the schema. The description does not add any parameter-specific details beyond what the schema provides (e.g., no examples of valid vendor IDs beyond the schema's 'e.g. 'V1' for Microsoft'), so it meets the baseline for high schema coverage without compensating with extra semantics.

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 specific action ('Get a comprehensive risk profile') and resource ('for a specific vendor'), distinguishing it from siblings like 'get_vendor' (likely basic info) or 'get_vulnerability_stats' (general stats). It explicitly lists the detailed components of the risk profile (vulnerabilities breakdown, severity distribution, etc.), making the purpose highly specific and differentiated.

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 when to use this tool ('Ideal for vendor risk assessment'), which implicitly suggests it's for evaluating vendor security rather than general lookup. However, it does not explicitly state when not to use it or name alternatives (e.g., use 'get_vendor' for basic info, 'search_vulnerabilities' for specific issues), leaving some guidance gaps.

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

get_vulnerabilityGet VulnerabilityA

Get full details of a specific vulnerability by its CVE ID (e.g. 'CVE-2021-44228') or internal ID (e.g. 'CVE001'). Returns the vulnerability with its associated vendor information.

ParametersJSON Schema
NameRequiredDescriptionDefault
cve_idYesCVE identifier, e.g. 'CVE-2021-44228' or internal ID like 'CVE001'

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 full burden for behavioral disclosure. It states what the tool returns ('full details' with 'associated vendor information'), but doesn't mention error handling (e.g., what happens if the ID doesn't exist), authentication requirements, rate limits, or whether this is a read-only operation. For a tool with zero annotation coverage, this leaves significant behavioral gaps.

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 perfectly concise with two sentences: the first states the purpose and parameters, the second specifies the return value. Every word earns its place, and information is front-loaded appropriately.

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?

Given the tool's moderate complexity (single parameter lookup), 100% schema coverage, but no annotations and no output schema, the description is adequate but incomplete. It covers the basic purpose and return scope, but lacks behavioral details that would be crucial for reliable agent use, especially without annotations.

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 description coverage is 100%, so the schema already fully documents the single parameter. The description adds minimal value by mentioning both CVE ID and internal ID formats, which the schema also covers. Baseline 3 is appropriate when the schema does the heavy lifting.

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 verb ('Get full details') and resource ('specific vulnerability'), specifies the lookup method ('by its CVE ID or internal ID'), and distinguishes from siblings like 'search_vulnerabilities' (which likely returns multiple results) and 'get_vulnerability_stats' (which provides aggregated data).

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 implicitly indicates when to use this tool (when you need full details for a specific known vulnerability ID), but doesn't explicitly state when not to use it or name alternatives like 'search_vulnerabilities' for broader queries. The context is clear but lacks explicit exclusions.

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

get_vulnerability_statsGet Vulnerability StatisticsA

Get summary statistics about vulnerabilities. Shows counts by severity, status, vendor, and year, plus CVSS score metrics (average, min, max). Optionally scope stats to a specific vendor.

ParametersJSON Schema
NameRequiredDescriptionDefault
vendor_idNoOptional vendor ID to scope stats, e.g. 'V1' for Microsoft only

TDQS

A3.9/5.0
Behavior3/5

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

With no annotations provided, the description carries the full burden. It discloses the tool's behavior as a read operation ('Get summary statistics') and scoping capability, but lacks details on permissions, rate limits, data freshness, or output format. It adequately describes what the tool does without contradicting any annotations.

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 efficiently structured in two sentences: the first states the core purpose and detailed metrics, the second adds the optional scoping feature. Every sentence adds value with zero waste, making it front-loaded and appropriately sized for the tool's complexity.

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?

Given no annotations and no output schema, the description is complete enough for a simple read tool with one optional parameter. It covers the purpose, scope, and basic usage, but lacks details on output format, error handling, or advanced behavioral traits, which would be beneficial for full contextual understanding.

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 description coverage is 100%, so the schema already documents the optional 'vendor_id' parameter. The description adds marginal value by mentioning scoping to a vendor, but does not provide additional syntax, format details, or examples beyond what the schema specifies. Baseline 3 is appropriate as the schema does the heavy lifting.

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 specific action ('Get summary statistics') and resource ('about vulnerabilities'), with detailed scope ('counts by severity, status, vendor, and year, plus CVSS score metrics'). It distinguishes from siblings like 'get_vulnerability' (single item) and 'search_vulnerabilities' (filtered search) by focusing on aggregated statistics.

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 usage ('Optionally scope stats to a specific vendor'), but does not explicitly state when not to use it or name alternatives among the sibling tools. It implies usage for aggregated vulnerability data rather than individual records or searches.

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

list_vendorsList VendorsB

List all registered software vendors in the vulnerability database. Optionally filter by category (e.g. 'Software', 'Open Source').

ParametersJSON Schema
NameRequiredDescriptionDefault
categoryNoFilter by vendor category, e.g. 'Software' or 'Open Source'

TDQS

B3.2/5.0
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 mentions listing 'all registered software vendors' and optional filtering, but doesn't address key behaviors such as pagination, rate limits, authentication requirements, or what happens if no vendors match the filter. This leaves significant gaps for an agent to understand how to interact with the tool effectively.

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

Conciseness4/5

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

The description is appropriately sized with two sentences that are front-loaded with the core purpose. The first sentence states the main action, and the second adds filtering details without unnecessary elaboration. However, it could be slightly more structured by explicitly separating purpose from parameters.

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?

Given the tool's low complexity (1 optional parameter, no output schema, no annotations), the description is moderately complete but lacks depth. It covers the basic purpose and parameter usage but misses behavioral context like response format, error handling, or integration with sibling tools. This makes it adequate but not fully comprehensive for an agent's needs.

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 description adds minimal value beyond the input schema, which already has 100% coverage. It mentions the optional 'category' parameter and provides examples ('Software', 'Open Source'), but doesn't elaborate on semantics like valid categories, case sensitivity, or default behavior when omitted. Since the schema does the heavy lifting, the baseline score of 3 is appropriate.

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

Purpose4/5

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

The description clearly states the verb ('List') and resource ('registered software vendors in the vulnerability database'), making the purpose specific and understandable. However, it doesn't explicitly differentiate this tool from its sibling 'get_vendor', which appears to retrieve a single vendor rather than list multiple vendors.

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 by mentioning optional filtering by category, but it doesn't provide explicit guidance on when to use this tool versus alternatives like 'search_vulnerabilities' or 'get_vendor_risk_summary'. No exclusions or prerequisites are stated, leaving usage context somewhat vague.

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

search_vulnerabilitiesSearch VulnerabilitiesA

Search and filter vulnerabilities with flexible criteria. All filters are optional and can be combined. Returns matching vulnerabilities sorted by CVSS score (highest first). Use for questions like 'show critical open vulnerabilities' or 'find CVEs published after 2023'.

ParametersJSON Schema
NameRequiredDescriptionDefault
vendor_idNoFilter by vendor ID, e.g. 'V1'
severityNoFilter by severity level: critical, high, medium, or low
statusNoFilter by status: open or patched
min_cvssNoMinimum CVSS score (0.0-10.0)
max_cvssNoMaximum CVSS score (0.0-10.0)
published_afterNoShow CVEs published after this date (YYYY-MM-DD)
published_beforeNoShow CVEs published before this date (YYYY-MM-DD)
keywordNoSearch in CVE title and ID, e.g. 'Log4Shell' or 'CVE-2021'

TDQS

A4.4/5.0
Behavior4/5

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

With no annotations provided, the description carries full burden and does well by disclosing key behavioral traits: all filters are optional and combinable, results are sorted by CVSS score (highest first), and it handles date-based filtering. It doesn't mention pagination, rate limits, or authentication needs, but covers core functionality adequately.

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 perfectly front-loaded with the core purpose in the first sentence, followed by behavioral details and usage examples. Every sentence earns its place with no wasted words, making it highly efficient and easy to parse.

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

Completeness4/5

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

Given the tool's complexity (8 parameters, no output schema, no annotations), the description provides good contextual completeness. It covers purpose, behavior, and usage examples, though it doesn't describe the return format or potential limitations. For a search tool with well-documented parameters, this is sufficient but could benefit from output details.

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 description coverage is 100%, so the baseline is 3. The description adds minimal parameter semantics beyond the schema, only implying flexibility through 'all filters are optional and can be combined'. It doesn't explain parameter interactions or provide additional context beyond what's in the schema descriptions.

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's purpose with specific verbs ('search and filter vulnerabilities') and resource ('vulnerabilities'), distinguishing it from siblings like get_vulnerability (singular retrieval) or get_vulnerability_stats (aggregate statistics). It explicitly mentions flexible criteria and sorting behavior, making the scope unambiguous.

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

Usage Guidelines5/5

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

The description provides explicit usage guidance with concrete examples ('show critical open vulnerabilities', 'find CVEs published after 2023'), indicating when to use this tool. It distinguishes from siblings by focusing on filtered searches rather than direct retrieval or statistical summaries, though it doesn't explicitly name alternatives.

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

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 6 tool updatesv1.0.0
    • First observedget_vendor
    • First observedget_vendor_risk_summary
    • First observedget_vulnerability
    • First observedget_vulnerability_stats
    • First observedlist_vendors
    • First observedsearch_vulnerabilities

TDQS

A4/5.0

Scored across 6 tools

Disambiguation5/5

Each tool has a clearly distinct purpose with no overlap: get_vendor retrieves vendor details, get_vendor_risk_summary provides risk profiles, get_vulnerability fetches specific vulnerability data, get_vulnerability_stats offers statistical summaries, list_vendors enumerates vendors, and search_vulnerabilities enables filtered searches. The descriptions explicitly differentiate their functions, preventing agent misselection.

Naming Consistency5/5

All tool names follow a consistent verb_noun pattern using snake_case, with verbs like 'get', 'list', and 'search' clearly indicating actions. This uniformity makes the tool set predictable and easy to navigate, enhancing agent usability without any naming deviations.

Tool Count5/5

With 6 tools, the server is well-scoped for a vulnerability registry, covering core operations such as retrieving vendors and vulnerabilities, assessing risks, and generating statistics. Each tool serves a unique and necessary function, avoiding bloat or gaps for this domain.

Completeness4/5

The tool set provides comprehensive coverage for querying and analyzing vulnerability data, including CRUD-like operations for vendors and vulnerabilities, risk assessment, and statistical insights. A minor gap exists in the lack of tools for creating, updating, or deleting entries, but this is reasonable for a read-only registry focused on data retrieval and analysis.

Maintenance

ActivityInactive
ResponsivenessNo issues

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