# Justin Spahr-Summers (slim)

> 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.

- Full: https://www.anchorterminal.com/people/justin-spahr-summers-2/index.md (~1,050 tokens) · this version ~880 tokens · JSON https://www.anchorterminal.com/people/justin-spahr-summers-2/index.json · canonical https://www.anchorterminal.com/people/justin-spahr-summers-2/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

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).

### 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.