Sophon MCP Server

Sophon is a deterministic context layer for agents speaking the Model Context Protocol. It compresses prompts, conversation memory, code digests, file deltas, and shell output - without an embedding model at query time, without a GPU, and without API keys. It runs locally over stdio via the published package.

People connecting this server to Claude, Cursor, VS Code, or another MCP client. The project is written in Rust.

VERIFIED ACTIVE

LAST COMMIT 2026-06-19 · ★ 6 · #409 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

MIT · Rust servers · how we verify → /methodology

01 · Install Sophon

before you install - you'll need

Set SOPHON_MEMORY_PATH, SOPHON_RETRIEVER_PATH, SOPHON_HYBRID before connecting.

Claude Code

claude mcp add lacausecrypto-mcp-sophon -- npx -y mcp-sophon

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "lacausecrypto-mcp-sophon": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-sophon"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package mcp-sophon - unscoped; check the name against the project README before installing

registry namespace io.github.lacausecrypto is GitHub-verified and matches the repo owner

03 · What Sophon can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.7.0 · 2026-06-19

See BENCHMARK.md for measured performance numbers and README.md for install instructions.

v0.6.0 · 2026-06-19

See BENCHMARK.md for measured performance numbers and README.md for install instructions.

v0.5.4 · 2026-04-30

See BENCHMARK.md for measured performance numbers and README.md for install instructions.

04 · Who maintains Sophon

Sophon is maintained by lacausecrypto. We track 7 MCP servers from lacausecrypto - 7 actively maintained, 40 combined GitHub stars, oldest repo from Apr 2026. Full record: all servers from lacausecrypto.

05 · Facts

repository: github.com/lacausecrypto/mcp-sophon
website: https://github.com/lacausecrypto/mcp-sophon#readme
category: other - ranked #409 of 848 actively-maintained other servers as of 2026-08-25.
release cadence: 2 releases in the last 90 days (latest 2026-06-19)
registry: io.github.lacausecrypto/sophon (active, first published 2026-04-15 · 8 versions)
packages: npm:mcp-sophon

06 · Sophon FAQ

What is Sophon?

Is Sophon still maintained?

Yes - as of 2026-08-25, its last commit was 2026-06-19 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Sophon?

Run `npx -y mcp-sophon`. The README documents 3 environment variables (SOPHON_MEMORY_PATH, SOPHON_RETRIEVER_PATH, SOPHON_HYBRID) to set first. Set SOPHON_MEMORY_PATH, SOPHON_RETRIEVER_PATH, SOPHON_HYBRID before connecting. You can also paste the ready-made client config above.

Does Sophon run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Sophon

Alternatives to Sophon

Maintained other servers if Sophon isn't the fit.

More MCP servers to compare · Xcodemcp · Mathematica MCP · Q URL · Disco · Slim Guard

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