Gcf MCP Server

Drop-in MCP proxy. 71% fewer tokens. Session dedup compounds to 92%. Zero code changes. Exposed over MCP by the gcf mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.

What it actually does

100% comprehension on every frontier model. 29% fewer tokens than TOON, 56% fewer than JSON (2,400+ evals, 11 models, 3 providers). Nested object flattening with opt-out for open-weight models. One line change in your MCP config.

Its toolset

Everything the assistant can do here goes through one of these:

• Flags — The Flags tool exposed by this server

Adding it to your client

The server ships on npm as @blackwell-systems/gcf-proxy, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.

When to reach for it

This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Gcf's toolset — Flags — is a fair guide to whether it matches your workflow. It is maintained by blackwell-systems; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

Caveats

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the gcf mcp server does with a few real requests.