# Den Delimarsky

> Den Delimarsky is lead Maintainer at Model Context Protocol. Fetch (MCP reference server), Filesystem (MCP reference server), Memory (MCP reference server) and Sequential Thinking (MCP reference server) on Anchor Terminal, with grades, an about and public profiles.

- Canonical: https://www.anchorterminal.com/people/den-delimarsky/
- Markdown: https://www.anchorterminal.com/people/den-delimarsky/index.md (~1,200 tokens)
- Slim: https://www.anchorterminal.com/people/den-delimarsky/index.min.md (~1,030 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/people/den-delimarsky/index.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

Lead Maintainer, Model Context Protocol.

- GitHub: https://github.com/localden

## What Den builds

- [Fetch (MCP reference server)](https://www.anchorterminal.com/tools/fetch-reference-server.md), graded C, 57.6/100, in Web search APIs. Python reference server with a single 'fetch' tool that retrieves a URL and converts HTML to markdown, with pagination (start_index/max_length) and raw mode. Lead Maintainer, Model Context Protocol, researched 2026-10-28.
- [Filesystem (MCP reference server)](https://www.anchorterminal.com/tools/filesystem-reference-server.md), graded C, 59.4/100, in Databases & files. Reference server for secure local file operations (read, write, edit, search, directory listing) restricted to allowed directories supplied as arguments or via MCP Roots. Lead Maintainer, Model Context Protocol, researched 2026-10-28.
- [Memory (MCP reference server)](https://www.anchorterminal.com/tools/memory-reference-server.md), graded C, 54.4/100, in Databases & files. Knowledge-graph persistent memory reference server (entities, relations, observations) stored as JSONL at MEMORY_FILE_PATH. Lead Maintainer, Model Context Protocol, researched 2026-10-28.
- [Sequential Thinking (MCP reference server)](https://www.anchorterminal.com/tools/sequential-thinking-reference-server.md), graded B, 62.7/100, in Reasoning scaffolds. Single-tool reference server (`sequentialthinking`) that structures step-by-step reasoning with numbered thoughts, revisions and branches; no external calls. Lead Maintainer, Model Context Protocol, researched 2026-10-28.

## Works with

- [Cliff Hall](https://www.anchorterminal.com/people/cliff-hall/), Reference servers maintainer, Model Context Protocol
- [David Soria Parra](https://www.anchorterminal.com/people/david-soria-parra/), Co-creator and Lead Maintainer, Model Context Protocol
- [Jonathan Hefner](https://www.anchorterminal.com/people/jonathan-hefner/), Reference servers maintainer, Model Context Protocol
- [Justin Spahr-Summers](https://www.anchorterminal.com/people/justin-spahr-summers/), Co-inventor, Lead Maintainer Emeritus, Model Context Protocol
- [Ola Hungerford](https://www.anchorterminal.com/people/ola-hungerford/), Reference servers maintainer, Model Context Protocol
- [Shaun Smith](https://www.anchorterminal.com/people/shaun-smith/), Reference servers maintainer, Model Context Protocol
- [Tadas Antanavicius](https://www.anchorterminal.com/people/tadas-antanavicius/), Reference servers maintainer, Model Context Protocol

## Questions

### Who is Den Delimarsky?

Den Delimarsky is lead Maintainer at Model Context Protocol.

### What does MCP project (reference servers) make?

Anchor Terminal lists Fetch (MCP reference server), Filesystem (MCP reference server), Memory (MCP reference server) and Sequential Thinking (MCP reference server) from MCP project (reference servers). Python reference server with a single 'fetch' tool that retrieves a URL and converts HTML to markdown, with pagination (start_index/max_length) and raw mode.

### How are Den's tools graded?

Fetch (MCP reference server) is graded C, 57.6 out of 100; Filesystem (MCP reference server) is graded C, 59.4 out of 100; Memory (MCP reference server) is graded C, 54.4 out of 100; Sequential Thinking (MCP reference server) is graded B, 62.7 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://modelcontextprotocol.io/docs/2026-07-28/getting-started/intro
- https://en.wikipedia.org/wiki/Model_Context_Protocol
- https://modelcontextprotocol.io/community/governance
- https://jspahrsummers.com/
- https://blog.modelcontextprotocol.io/posts/2025-12-09-mcp-joins-agentic-ai-foundation/
- https://github.com/dsp

These are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.

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