# Justin Spahr-Summers

> Justin Spahr-Summers is original reference-server contributor; MCP co-creator; former Anthropic employee. PostgreSQL (archived MCP reference server) and Puppeteer (archived MCP reference server) on Anchor Terminal, with grades, an about and public profiles.

- Canonical: https://www.anchorterminal.com/people/justin-spahr-summers-2/
- Markdown: https://www.anchorterminal.com/people/justin-spahr-summers-2/index.md (~1,050 tokens)
- Slim: https://www.anchorterminal.com/people/justin-spahr-summers-2/index.min.md (~880 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/people/justin-spahr-summers-2/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

Original reference-server contributor; MCP co-creator; former Anthropic employee.

Justin Spahr-Summers co-created the Model Context Protocol with David Soria Parra as an engineer at Anthropic, which announced it in November 2024. The protocol's governance page lists him as co-inventor and lead maintainer emeritus.

- LinkedIn: https://www.linkedin.com/in/jspahrsummers/

## What Justin builds

- [PostgreSQL (archived MCP reference server)](https://www.anchorterminal.com/tools/postgres-reference-server-archived.md), graded F, 18.6/100, in Databases & files. Archived PostgreSQL reference MCP server for SQL queries. Its read-only transaction wrapper has a documented bypass. Original reference-server contributor; MCP co-creator; former Anthropic employee, founder, researched 2026-10-28.
- [Puppeteer (archived MCP reference server)](https://www.anchorterminal.com/tools/puppeteer-reference-server-archived.md), graded F, 30.8/100, in Browser automation. The original browser-automation reference server, driving Chrome through Puppeteer with screenshots and JavaScript evaluation. Original reference-server contributor; MCP co-creator; former Anthropic employee, founder, researched 2026-10-28.

## Works with

- [David Soria Parra](https://www.anchorterminal.com/people/david-soria-parra-2/), Co-creator of Model Context Protocol; lead maintainer

## Questions

### Who is Justin Spahr-Summers?

Justin Spahr-Summers co-created the Model Context Protocol with David Soria Parra as an engineer at Anthropic, which announced it in November 2024. The protocol's governance page lists him as co-inventor and lead maintainer emeritus.

### What does Model Context Protocol (archived) make?

Anchor Terminal lists PostgreSQL (archived MCP reference server) and Puppeteer (archived MCP reference server) from Model Context Protocol (archived). Archived PostgreSQL reference MCP server for SQL queries. Its read-only transaction wrapper has a documented bypass.

### How are Justin's tools graded?

PostgreSQL (archived MCP reference server) is graded F, 18.6 out of 100; Puppeteer (archived MCP reference server) is graded F, 30.8 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://github.com/modelcontextprotocol/servers-archived/commits/main/src/postgres
- https://github.com/jspahrsummers
- https://jspahrsummers.com
- https://www.linkedin.com/in/jspahrsummers/
- https://github.com/modelcontextprotocol/servers-archived
- https://github.com/modelcontextprotocol/servers-archived/tree/main/src/postgres
- https://en.wikipedia.org/wiki/Model_Context_Protocol
- https://modelcontextprotocol.io/community/governance
- https://github.com/modelcontextprotocol/servers-archived/commits/main/src/puppeteer
- https://github.com/modelcontextprotocol/servers-archived/tree/main/src/puppeteer

Not the same person as [Justin Spahr-Summers](https://www.anchorterminal.com/people/justin-spahr-summers/) (MCP project (reference servers)), as far as the research can tell.

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.

---

Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp