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OpenTK Model Context Protocol Server

OpenTK Model Context Protocol Server

by r-huijts

OpenTK Model Context Protocol Server

Important Attribution: This MCP server is built as a wrapper around the excellent OpenTK project created by Bert Hubert. The OpenTK project provides unprecedented access to Dutch parliamentary data through a user-friendly interface. Learn more about the project in Bert's article: Welkom bij OpenTK. All credit for the underlying data access and processing goes to Bert Hubert and his contributions to open government data.

A bridge between large language models (LLMs) and Dutch parliamentary data through a standardized interface. This MCP server provides access to Dutch parliamentary documents, debates, and member information from the Tweede Kamer.

Real-World Natural Language Interaction Examples

Related MCP server: Riksdag & Regering MCP

Example 1: Comparing Party Positions on AI Policies

User Query: "When comparing the activities of opposition parties PvdA, GroenLinks, and Volt with government party BBB in the Dutch House of Representatives in the field of AI, what are actions they can undertake together in the short term that align with the positions and views they have demonstrated over the past year? Please use sources from OpenTK."

Example 2: Researching Parliamentary Discussions on Climate Policy

User Query: "I'd like to analyze recent parliamentary debates on climate policy and emission reduction targets in the Netherlands. Can you help me identify key discussions and the main positions taken by different parties over the past six months?"

Example 3: Information About a Specific MP's Voting Record

User Query: "What is MP Pieter Omtzigt's voting record on healthcare reform legislation, and how does his position differ from other independent members? Has he introduced any motions on this topic?"

Example 4: Finding Recent Housing Legislation Developments

User Query: "What are the most significant parliamentary documents and debates about affordable housing legislation from the past year? I'm particularly interested in proposals addressing the rental market crisis."

Example 5: Efficiently Triaging Multiple Documents (NEW - Smart Analysis)

User Query: "I found 15 documents about climate policy from the last month. Can you quickly identify which 3 documents are most relevant to renewable energy subsidies and wind power legislation, without reading all of them in full?"

Example 6: Extracting Key Topics from Parliamentary Documents (NEW - Smart Analysis)

User Query: "What are the main topics, keywords, and political parties mentioned in document 2024D39058? I want to understand what it's about before diving into the full text."

Example 7: Finding MPs with Specific Committee Memberships

User Query: "Which MPs currently serve on both the Finance Committee and the Economic Affairs Committee? What parties do they represent, and have they recently submitted any joint initiatives?"

Example 8: Identifying Upcoming Parliamentary Activities on Digital Security

User Query: "Are there any scheduled committee meetings or debates about cybersecurity and digital infrastructure planned for the next month? Which ministers will be participating and what specific topics will be addressed?"

Project Concept

The OpenTK project is a Model Context Protocol (MCP) server that provides access to Dutch parliamentary data through a standardized interface. It serves as a bridge between large language models (LLMs) and the Dutch Parliament's information systems, allowing AI assistants to search, retrieve, and analyze parliamentary documents, debates, and member information.

The server uses the @modelcontextprotocol/sdk to implement the MCP specification, which enables structured communication between AI models and external data sources. By exposing parliamentary data through well-defined tools and endpoints, OpenTK makes it possible for AI assistants to:

  1. Search for parliamentary documents using complex queries

  2. Access information about Members of Parliament

  3. Retrieve official documents in various formats and read the full content of the documents

  4. Analyze parliamentary activities and proceedings

  5. Track legislative cases and government pledges

  6. Intelligently analyze document relevance using NLP before loading full content (NEW in v1.0.16)

  7. Extract keywords, entities, and topics for efficient document triage (NEW in v1.0.16)

The project leverages Bert Hubert's tkconv service as its primary data source, which provides a more accessible API than the official Dutch Parliament APIs.

Features

Core Parliamentary Data Access

  • Search parliamentary documents with advanced query capabilities (quotes, NOT, OR, NEAR operators)

  • Access comprehensive MP information and committee memberships

  • Retrieve full document content (PDF, Word) with smart chunking

  • Track legislative cases, government activities, and voting results

  • Real-time access to parliamentary proceedings and upcoming activities

Smart Document Analysis (NEW in v1.0.16) 🎯

  • NLP-Powered Relevance Analysis: Intelligently analyze documents before loading full content

  • TF-IDF Keyword Extraction: Identify the top 10-15 most important terms in any document

  • Dutch-Optimized Entity Recognition: Automatically detect persons (MPs, ministers), political parties (VVD, PVV, CDA, D66, etc.), and organizations

  • Topic Categorization: Classify documents across 10 major political themes (Climate, Economy, Healthcare, Education, etc.)

  • Relevance Scoring: Rank documents by relevance to specific search terms (0-100 score)

  • Context-Efficient Triage: Reduce context window usage by 80-90% when evaluating multiple documents

Advanced Document Navigation

  • Find specific person occurrences with fuzzy matching

  • Find party mentions with fuzzy matching

  • Navigate large documents efficiently with character offsets

  • Sequential reading with pagination support

Available Tools

OpenTK provides 17 specialized tools for accessing Dutch parliamentary data:

Overview & Discovery

  • get_overview: Comprehensive overview of recent parliamentary activities and MP birthdays (paginated)

  • birthdays_today: List MPs celebrating birthdays today

  • list_persons: Complete directory of current MPs with party affiliations

Search & Filter

  • search_tk: Comprehensive search across all parliamentary data with advanced query syntax

  • search_tk_filtered: Search within specific categories (Document, Activiteit, Zaak)

  • search_by_category: Search for specific document types (questions, motions, all)

Document Intelligence (NEW) 🎯

  • analyze_document_relevance: NLP-powered document analysis with keyword extraction, entity recognition, and relevance scoring

  • get_document_content: Retrieve document content (PDF/DOCX) with three reading modes (targeted, sequential, full)

  • find_person_in_document: Locate all occurrences of a person in a document with fuzzy matching

  • find_party_in_document: Locate all occurrences of a political party in a document

Document Metadata

  • get_document_details: Retrieve structured metadata about documents

  • get_document_links: Convert document URLs to clickable markdown links

Parliamentary Structure

  • get_committees: List all parliamentary committees

  • get_committee_details: Detailed information about specific committees

Activities & Voting

  • get_upcoming_activities: Upcoming parliamentary debates and meetings

  • get_voting_results: Recent voting results with party positions

Media

  • get_photo: Retrieve official MP portrait photographs

Installation

The fastest way to get started is using the published npm package:

npx @r-huijts/opentk-mcp

2. Using Claude Desktop with NPM Package

Update your Claude configuration file (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "opentk": {
      "command": "npx",
      "args": [
        "-y",
        "@r-huijts/opentk-mcp"
      ]
    }
  }
}

Alternative configurations:

For MultiServerMCPClient (Python):

mcp_client = MultiServerMCPClient({
    "opentk": {
        "command": "npx",
        "args": ["-y", "@r-huijts/opentk-mcp"],
        "transport": "stdio",
    }
})

3. From Source (Development)

If you want to modify the code or contribute to development:

Clone Repository:

git clone https://github.com/r-huijts/opentk-mcp.git
cd opentk-mcp

Install Dependencies:

npm install

Build the Project:

npm run build

Start the Server:

npm start

Configure Claude Desktop for local development:

Update your Claude configuration file:

{
  "mcpServers": {
    "opentk-local": {
      "command": "node",
      "args": [
        "/absolute/path/to/your/opentk-mcp/dist/index.js"
      ]
    }
  }
}

Make sure to replace /absolute/path/to/your/opentk-mcp/ with the actual path to your installation.

4. Publishing (for maintainers)

To publish a new version of the scoped package:

npm run build
npm publish --access=public

Note: Scoped packages require the --access=public flag to be publicly available.

Search Functionality

The search functionality is particularly sophisticated, supporting:

  • Simple keyword searches: kunstmatige intelligentie

  • Exact phrase searches: "kunstmatige intelligentie"

  • Exclusion searches: Hubert NOT Bruls

  • Boolean operators: OR, NEAR()

The implementation handles various edge cases:

  • Preserves quotes in search queries

  • Uses proper content type headers

  • Implements fallback mechanisms for API errors

  • Provides meaningful error messages

Error Handling

The API service includes robust error handling:

  • Graceful handling of API errors (4xx, 5xx)

  • Fallback to simplified queries when complex ones fail

  • Detailed error messages for debugging

  • Proper logging to stderr (not stdout, which would break the stdio transport)

Configuration

The server connects to Bert Hubert's tkconv service as its primary data source, which provides a more accessible API than the official Dutch Parliament APIs. This service, created by Bert Hubert, does the heavy lifting of collecting, organizing, and making available Dutch parliamentary data in a developer-friendly format. Our MCP server builds upon this foundation to create a standardized interface for AI assistants to interact with this valuable data.

License

MIT

Conclusion

The OpenTK MCP server provides a robust and well-structured interface to Dutch parliamentary data, making it accessible to AI assistants through the Model Context Protocol. Its modular design, comprehensive API, NLP-powered document analysis (v1.0.16), and thorough testing ensure reliable access to parliamentary information for AI-assisted research, analysis, and information retrieval.

Once configured, Claude will be able to access Dutch parliamentary data through the OpenTK MCP server using all 17 specialized tools for search, document analysis, MP information, committee tracking, voting results, and more.

Available Tools

14 tools
birthdays_todayA

Lists all Members of Parliament celebrating their birthday today, including their names, political parties, and birth dates. The response is a JSON array where each entry contains the MP's ID, name, party affiliation, and other details. Use this tool when a user specifically asks about birthdays, wants to know which MPs are celebrating today, or needs to create 'on this day' content. This tool takes no parameters as it always returns today's birthdays. For a more general overview that includes birthdays along with other parliamentary information, use the 'get_overview' tool instead. If you need to display an MP's photo alongside their birthday information, you can use the 'get_photo' tool with the MP's ID from this response.

Inputs: no named parameters.

get_committee_detailsA

Retrieves detailed information about a specific parliamentary committee, including its members, recent activities, and description. This provides deeper insight into the committee's composition, leadership roles, and recent work. Use this when you need comprehensive information about a particular committee's structure and activities.

Inputs: committeeId (required).

get_committeesA

Retrieves a list of all parliamentary committees with their IDs, names, and URLs. The response is a JSON array where each entry represents a committee with its unique identifier and name. Use this tool when a user asks about parliamentary committees, wants to know which committees exist, or needs to find committees related to specific policy areas. Committees are specialized groups of MPs that focus on specific domains like defense, healthcare, or finance. After getting the list of committees, you can use the 'get_committee_details' tool with a specific committee ID to retrieve more detailed information about that committee, including its members and recent activities. This tool takes no parameters as it returns all active committees.

Inputs: no named parameters.

get_document_contentA

Downloads a parliamentary document and extracts its text content for use in the conversation. This tool retrieves the actual content of a document based on its ID, making it available for analysis, summarization, or direct reference in the conversation. The text is extracted from PDF or Word (DOCX) documents using professional libraries and returned in a readable format.

IMPORTANT: For longer documents, the content may be truncated. The response includes pagination information to help you retrieve the complete document:

  • isTruncated: Indicates whether there is more content available

  • totalLength: The total length of the document content

  • currentOffset: The starting position of the current content chunk

  • nextOffset: The starting position for the next content chunk (use this as the 'offset' parameter in your next call)

  • remainingLength: The amount of content remaining after the current chunk

To retrieve the complete document, you can make multiple calls to this tool, incrementing the offset each time:

Example usage:

  1. First call: get_document_content({docId: '2025D18220'})

  2. If the response shows isTruncated=true, call again with the nextOffset value: get_document_content({docId: '2025D18220', offset: 8000})

  3. Continue until isTruncated=false or you've retrieved all the content you need.

This pagination approach allows you to analyze even very long documents within the conversation context.

Use this tool when you need to analyze or discuss the specific content of a document rather than just its metadata.

Inputs: docId (required), offset.

get_document_detailsA

Retrieves metadata about a parliamentary document in a structured JSON format, without downloading the actual document content. Returns information including title, type, document number, dates, version number, and clickable links to both the PDF version and the official Tweede Kamer webpage. This tool is ideal for getting quick information about a document and obtaining the relevant links for further access. To actually download the document content, use the 'download_document' tool instead.

Inputs: nummer (required).

get_overviewA

Provides a comprehensive overview of recent parliamentary activities, including the most recent documents and MPs celebrating birthdays today. This is the ideal starting point for any parliamentary data exploration. The response contains structured data with two main sections: 'recentDocuments' (listing the latest parliamentary documents with their IDs, titles, types, dates, and URLs) and 'birthdays' (listing MPs celebrating birthdays today). The results are paginated with 10 documents per page, and you can navigate through pages using the 'page' parameter. The tool can be used iteratively to retrieve subsequent pages of results - first call with page=1, then check the pagination.hasMoreDocuments field in the response, and if true, call again with page=2, and so on. This allows you to 'scroll' through all available documents when needed. The response includes pagination information showing the current page, whether more documents are available, and the total number of documents retrieved. Use this tool first when a user asks for general information about recent parliamentary activities or needs a starting point for research. After getting this overview, you can use other tools like 'get_document_details' to retrieve more information about specific documents, 'search_tk' to find documents on specific topics, or 'get_photo' to retrieve photos of MPs mentioned in the birthdays section.

Inputs: page.

get_photoA

Retrieves the official portrait photograph of a Member of Parliament. Returns the image as a binary resource that can be displayed or saved. Use this when you need to include a visual representation of an MP in reports, presentations, or profiles.

Inputs: personId (required).

get_upcoming_activitiesA

Retrieves a list of upcoming parliamentary activities including debates, committee meetings, and other events. The response contains a structured JSON object with both a chronological list of activities and activities grouped by date. Each activity includes details like date, time, location, committee, type, and a URL for more information. Use this tool when a user asks about the parliamentary agenda, wants to know what events are coming up, or needs information about specific types of parliamentary activities. The results are sorted by date with the most imminent activities first. You can limit the number of results using the optional 'limit' parameter. This tool is particularly useful for helping users plan which parliamentary sessions to follow or for providing an overview of the upcoming parliamentary schedule.

Inputs: limit.

get_voting_resultsA

Retrieves recent voting results on parliamentary motions and bills. The response contains a structured JSON object with voting results sorted by date (newest first). Each result includes detailed information such as the title of the motion/bill, the date of the vote, the submitter, whether it was accepted or rejected, the vote counts (for/against), and which political parties voted for or against. Use this tool when a user asks about recent parliamentary votes, wants to know how parties voted on specific issues, or needs to analyze voting patterns. You can control the number of results with the 'limit' parameter and choose between 'full' or 'summary' format. The 'summary' format provides a more structured representation with renamed fields, while both formats include complete party voting information. This tool is particularly valuable for tracking political alignments, understanding coalition dynamics, and analyzing how different parties position themselves on important issues.

Inputs: format, limit.

list_personsA

Provides a complete directory of current Members of Parliament with their IDs, names, titles, party affiliations, and faction memberships. The response is a JSON array where each entry contains an MP's full details. Use this tool when a user needs comprehensive information about all MPs, wants to analyze the composition of parliament by party, or needs to find specific MPs by name or party. This tool is particularly useful for creating reports about parliamentary representation or for finding the IDs of MPs that can be used with other tools like 'get_photo'. This tool takes no parameters as it returns all current MPs. For a more targeted approach when looking for specific MPs, consider using the 'search_tk' tool with the MP's name.

Inputs: no named parameters.

search_by_categoryA

Performs a search specifically for documents of a certain category, such as questions, motions, or letters. The response contains a structured JSON object with paginated results and metadata. Use this tool when a user wants to find documents of a specific type that match certain keywords or when they need more targeted search results than the general search provides. The 'category' parameter lets you filter by document type: 'vragen' for parliamentary questions, 'moties' for motions, or 'alles' for all document types. The search syntax supports advanced queries: 'Joe Biden' finds documents with both terms anywhere, '"Joe Biden"' (with quotes) finds exact phrases, 'Hubert NOT Bruls' finds documents with 'Hubert' but not 'Bruls' (capital NOT is required), and you can use 'OR' for alternatives. Results are sorted by date with the most recent documents first. This tool is particularly useful for finding specific types of parliamentary documents on a given topic.

Inputs: category (required), query (required), limit, page.

search_tkA

Performs a comprehensive search across all parliamentary data including documents, activities, and cases. Returns results matching the provided keyword or phrase. Use this for general searches when you need information on any topic discussed in parliament, regardless of document type or context. Search syntax: Searching for 'Joe Biden' finds documents containing both 'Joe' and 'Biden' anywhere in the text. Searching for "Joe Biden" (with quotes) finds only documents where these words appear next to each other. Searching for 'Hubert NOT Bruls' finds documents containing 'Hubert' but not 'Bruls'. The capital letters in 'NOT' are important. You can also use 'OR' and 'NEAR()' operators.

Inputs: query (required), format, limit, page.

search_tk_filteredA

Performs a targeted search within a specific category of parliamentary data. Unlike the general search, this tool allows you to limit results to only documents, activities, or cases. Use this when you need more focused search results within a particular content type. Search syntax: Searching for 'Joe Biden' finds documents containing both 'Joe' and 'Biden' anywhere in the text. Searching for "Joe Biden" (with quotes) finds only documents where these words appear next to each other. Searching for 'Hubert NOT Bruls' finds documents containing 'Hubert' but not 'Bruls'. The capital letters in 'NOT' are important. You can also use 'OR' and 'NEAR()' operators.

Inputs: query (required), type (required), format, limit, +1 more.

Tool Schema Changelog

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

Loading tool schema changelog…

    TDQS

    A4.1/5.0

    Scored across 14 tools

    Disambiguation3/5

    Most tools have distinct purposes, but there is notable overlap between search_tk, search_tk_filtered, and search_by_category, which could confuse agents about which to use for document searches. Additionally, get_document_details and get_document_content serve different functions but might be misselected due to similar naming and domain overlap. The descriptions help clarify, but the boundaries are not perfectly clear.

    Naming Consistency4/5

    The naming follows a consistent verb_noun pattern (e.g., get_overview, list_persons, search_tk) with minor deviations like birthdays_today (noun_verb) and get_document_links (which could be named more consistently as get_document_links or similar). Overall, the pattern is readable and mostly predictable, with only a few inconsistencies.

    Tool Count5/5

    With 14 tools, the count is well-scoped for a parliamentary data server, covering MPs, committees, documents, activities, and searches. Each tool appears to serve a specific purpose without redundancy, fitting within the typical 3-15 range for such a domain.

    Completeness4/5

    The tool set provides comprehensive coverage for parliamentary data, including CRUD-like operations for documents (get, search), MPs (list, get photo), committees (list, get details), and activities (get overview, get upcoming). Minor gaps include no explicit update or delete tools, but this is reasonable for a read-only data source, and agents can work around this with the available search and retrieval tools.

    Maintenance

    ActivityInactive
    ResponsivenessLimited data

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