MCP Catalog

A comprehensive list of MCP servers built and used, along with their features, use cases, and achievements.

About This Document

This document is a catalog listing the MCP servers currently built and in use. It describes the features, provided tools, and practical usage examples for each MCP.

Use this as a reference when considering the development of new MCPs, or as a guide for understanding how to use existing MCPs. While each MCP provides value on its own, combining multiple MCPs can enable more powerful workflows. This document provides insights into such combinations.

Overview Map

This map provides a visual overview of the MCP ecosystem, showing how different MCPs are organized into categories.

Custom MCP Servers

rfcxml-mcp

Provides structured access to IETF RFC documents.

Item	Description
Repository	shuji-bonji/rfcxml-mcp
npm	@shuji-bonji/rfcxml-mcp
Purpose	RFC specification search, analysis, and requirements extraction
Status	Published

Main Tools

Tool	Function
get_rfc_structure	Get RFC section hierarchy and metadata
get_requirements	Structured extraction of MUST/SHOULD/MAY requirements
get_definitions	Get term definitions
get_rfc_dependencies	Get references (normative/informative)
get_related_sections	Get related sections
generate_checklist	Generate implementation checklist in Markdown
validate_statement	Verify if implementation conforms to specification

Achievements

• Used for Japanese translation of RFC 6455 (WebSocket)
• Used for mapping between Electronic Signature Act and RFC 3161
• Automatically extracted 75 MUST requirements and 23 SHOULD requirements

w3c-mcp

Provides access to W3C/WHATWG/IETF Web standard specifications.

Item	Description
Repository	shuji-bonji/w3c-mcp
npm	@shuji-bonji/w3c-mcp
Purpose	Web standard specification search, WebIDL, CSS, HTML elements
Status	Published (npm v0.1.7)

Main Tools

Tool	Function
list_w3c_specs	List specifications (filter by organization, category, keyword)
get_w3c_spec	Get specification details
search_w3c_specs	Search specifications
get_webidl	Get WebIDL interface definitions
get_css_properties	Get CSS property definitions
get_html_elements	Get HTML element definitions
get_pwa_specs	List PWA-related specifications
get_spec_dependencies	Get specification dependencies

xcomet-mcp-server

Provides translation quality evaluation using the xCOMET model.

Item	Description
Repository	shuji-bonji/xcomet-mcp-server
npm	xcomet-mcp-server
Purpose	Quantitative translation quality evaluation and error detection
Status	Published (1 star, 1 fork)

Main Tools

Tool	Function
xcomet_evaluate	Translation quality score (0-1) and error span detection
xcomet_detect_errors	Detailed error detection (severity: minor/major/critical)
xcomet_batch_evaluate	Batch evaluation of multiple translation pairs

Features

• Persistent model loading (fast inference after initialization)
• GPU support
• Batch processing support

Achievements

• Translated and quality-evaluated 180-page technical document (1.5 million characters) in one day
• Cost of approximately $12 (less than 1/100 of conventional methods)

rxjs-mcp-server

Provides RxJS stream execution, visualization, and analysis.

Item	Description
Repository	shuji-bonji/rxjs-mcp-server
Purpose	RxJS code execution, marble diagram generation, and analysis
Status	Published

Main Tools

Tool	Function
execute_stream	Execute RxJS code and capture results
generate_marble	Generate ASCII marble diagrams
analyze_operators	Operator analysis and performance checking
detect_memory_leak	Memory leak detection
suggest_pattern	Pattern suggestions based on use cases

epsg-mcp

Provides access to the EPSG coordinate reference system database.

Item	Description
Repository	shuji-bonji/epsg-mcp
npm	@shuji-bonji/epsg-mcp
Purpose	Coordinate Reference System (CRS) knowledge base with global coverage
Status	Published (npm v0.9.8)

Main Tools

Tool	Function
search_crs	Search EPSG CRS by keyword
get_crs_detail	Get detailed info for specific EPSG code
list_crs_by_region	List CRS by region with recommendations
recommend_crs	Recommend optimal CRS for purpose/location
validate_crs_usage	Validate CRS appropriateness
suggest_transformation	Suggest transformation paths between CRS
compare_crs	Compare two CRS from various perspectives
get_best_practices	Get CRS best practices for specific topics
troubleshoot	Troubleshoot CRS-related problems

Features

• Full support for Japan Plane Rectangular CS (Zones I-XIX)
• Global coverage (WGS84, UTM zones, etc.)
• Offline operation with local database
• Regional packs (Japan, US, UK)

pdf-spec-mcp

Provides structured access to PDF specifications (ISO 32000).

Item	Description
Repository	shuji-bonji/pdf-spec-mcp
npm	@shuji-bonji/pdf-spec-mcp
Purpose	PDF specification (ISO 32000-1/2) structured reference and requirements extraction
Status	Published (npm v0.2.2)

Main Tools

Tool	Function
list_specs	List available PDF specification documents
get_structure	Get section hierarchy of PDF specification
get_section	Get content of a specific section
search_spec	Full-text search of PDF specification
get_requirements	Extract normative requirements (shall/must/may)
get_definitions	Get term definitions
get_tables	Extract table structures
compare_versions	Compare sections between PDF 1.7 and PDF 2.0

pdf-reader-mcp

Provides PDF internal structure analysis and reading capabilities.

Item	Description
Repository	shuji-bonji/pdf-reader-mcp
npm	@shuji-bonji/pdf-reader-mcp
Purpose	PDF reading, structure analysis, and accessibility validation
Status	Published (npm v0.2.0)

Main Tools

Tool	Function
read_text	Text extraction with reading order
read_images	Image extraction
search_text	Text search within PDF
get_metadata	Metadata extraction
inspect_structure	Internal object structure inspection
inspect_tags	Tagged PDF structure analysis
inspect_fonts	Font information listing
inspect_annotations	Annotation listing
inspect_signatures	Digital signature field inspection
validate_tagged	PDF/UA tag structure validation
validate_metadata	Metadata conformance validation
compare_structure	Compare structures of two PDFs
read_url	Fetch and read PDF from URL
summarize	Generate PDF overview report

Features

• 15 specialized tools across 3 tiers (basic / inspection / validation)
• PDF/UA accessibility compliance checking
• 185 tests (146 E2E tests)

pwa-mcp

Provides PWA (Progressive Web App) development support.

Item	Description
Repository	shuji-bonji/pwa-mcp
Purpose	PWA development support
Status	Private

Integration MCP Servers

MCPs that are not custom-built but are integrated into workflows.

deepl-mcp

Item	Description
Provider	DeepL Official
Use Case	High-quality translation, glossary support
Integration	Combined with xcomet-mcp-server for translation workflow

Main Tools

• translate-text - Text translation
• translate-document - Document translation
• rephrase-text - Text rephrasing
• Glossary support

hourei-mcp-server (e-gov-law-mcp)

Item	Description
Provider	ryoooo/e-gov-law-mcp
Use Case	Japanese law search and article retrieval
Integration	Combined with rfcxml-mcp for law-to-technical-specification mapping

Main Tools

• search_law - Law search
• get_law_data - Get law details
• find_law_article - Article search
• get_law_revision - Revision history

Achievements

• Created mapping table between Electronic Signature Act and RFC 3161

mermaid-mcp

Item	Description
Use Case	Mermaid diagram generation and rendering
Integration	Document generation workflow

svelte-mcp / shadcn-svelte-mcp

Item	Description
Use Case	Svelte/SvelteKit development support, UI components
Integration	Frontend development

MCP Categories

The available MCPs can be organized by their primary function and use case, as shown in the following diagram.

Workflow-Based MCP Combinations

Technical Document Translation Workflow

RFC Specification Review Workflow

Law-to-Technical-Specification Mapping Workflow

Planned MCPs

The following MCPs are currently in the planning phase or under development and represent the future direction of the ecosystem.

MCP	Target	Priority	Notes
OpenAPI MCP	OpenAPI Spec	High	API design support
OWASP MCP	OWASP Top 10	High	Security checking
Angular MCP	Angular	Medium	Specialized domain usage
NgRx MCP	NgRx	Medium	State management patterns
ISO MCP	ISO Standards	Medium	International standard reference
PDF Spec MCP	ISO 32000	Low	✅ Published @shuji-bonji/pdf-spec-mcp
BIM/IFC MCP	buildingSMART	Low	Building information modeling
HL7 FHIR MCP	HL7 FHIR	Low	Healthcare information exchange

npm Publication Status

The following table lists the MCPs that have been published to npm, including their current versions and descriptions.

Package	Version	Description
@shuji-bonji/rfcxml-mcp	v0.4.5	IETF RFC Structured Reference
xcomet-mcp-server	v0.3.6	Translation Quality Evaluation
@shuji-bonji/w3c-mcp	v0.1.7	W3C Web Standards
@shuji-bonji/epsg-mcp	v0.9.8	EPSG Coordinate Reference Systems
@shuji-bonji/pdf-spec-mcp	v0.2.2	PDF Specification (ISO 32000)
@shuji-bonji/pdf-reader-mcp	v0.2.0	PDF Internal Structure Analysis

Reference Links

Here are the key references and resources for MCP catalog information and repositories.

• npm: @shuji-bonji
• GitHub: shuji-bonji