{"id":51508543,"url":"https://github.com/blackwell-systems/gcf-codex-plugin","last_synced_at":"2026-07-08T03:30:38.372Z","repository":{"id":364645281,"uuid":"1268704131","full_name":"blackwell-systems/gcf-codex-plugin","owner":"blackwell-systems","description":"Codex plugin for GCF Proxy. 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Reduces MCP tool call token costs by 71%.\n\n## Install\n\n```bash\ncodex plugin add gcf-proxy\n```\n\n## What it does\n\nEvery MCP tool call returns JSON. This plugin wraps your MCP servers with [GCF Proxy](https://github.com/blackwell-systems/gcf-proxy), which re-encodes those JSON responses as GCF before they reach the model.\n\n**The savings:**\n\n| Metric | Value |\n|--------|-------|\n| Token reduction vs JSON | **71%** |\n| Token reduction vs TOON | **25%** |\n| Session dedup (warm session) | **up to 92%** |\n| Comprehension accuracy | **100%** across 1,700+ LLM evaluations |\n\n## Skills\n\n| Skill | Description |\n|-------|-------------|\n| `/gcf-proxy:setup \u003cserver\u003e` | Wrap any MCP server with gcf-proxy |\n| `/gcf-proxy:stats` | Show token savings for the current session |\n\n## Hooks\n\n- **SessionStart**: Clears stale stats from previous sessions\n- **Stop**: Shows notification with calls rewritten, % saved, and tokens saved\n\n## Quick start\n\nAfter installing, wrap any MCP server:\n\n```\n/gcf-proxy:setup github\n```\n\nThis modifies your MCP config to route the server through gcf-proxy. The original config is preserved (disabled, with a `-raw` suffix) so you can revert anytime.\n\n## How the savings work\n\n1. **First call (71% savings):** GCF encodes the same structured data in 71% fewer tokens than JSON. The model reads GCF natively with 100% comprehension accuracy.\n2. **Subsequent calls (up to 92%):** Session deduplication detects repeated structure. Only deltas are transmitted.\n3. **Zero code changes:** The proxy wraps any MCP server. The server still outputs JSON; the proxy re-encodes before it reaches the model.\n\n## Cost example\n\nA team running 1,000 queries/day with GPT-5.5 ($5/MTok input):\n\n| Format | Monthly cost | Annual cost |\n|--------|-------------|-------------|\n| JSON | $12,098 | $145,171 |\n| GCF | $3,549 | $42,583 |\n| **Savings** | **$8,549/mo** | **$102,588/yr** |\n\n[Try the cost calculator](https://gcformat.com/calculator) with your own numbers.\n\n## Links\n\n- [GCF Spec](https://gcformat.com)\n- [GCF Proxy](https://github.com/blackwell-systems/gcf-proxy)\n- [Claude Code Plugin](https://github.com/blackwell-systems/gcf-claude-plugin)\n- [Benchmarks](https://gcformat.com/guide/benchmarks.html)\n- [Cost Calculator](https://gcformat.com/calculator)\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fblackwell-systems%2Fgcf-codex-plugin","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fblackwell-systems%2Fgcf-codex-plugin","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fblackwell-systems%2Fgcf-codex-plugin/lists"}