gcf

Skill Data & Analytics Usable

Works inClaude Code

Usable Scanned — metadata only

Reduces API costs and latency by cutting token usage 50–92% versus JSON while maintaining perfect fidelity across LLM inference—directly lowering operational…

The AI-native wire format for structured data. 100% comprehension on every frontier model. 50-92% fewer tokens than JSON. 43B+ lossless round-trips across 17 formats. Spec v3.2 Stable.

Reduce API payload sizes by converting JSON data to GCF format for faster transfers.
Parse and validate structured data across multiple formats with guaranteed lossless conversion.
Optimize token usage in Claude API calls by encoding large datasets in GCF format.

26 starsMIT (commercial OK)Free

Usable rating — This tool is functional but has notable gaps. Review the evaluation notes below before deploying.

Why it matters

Reduces API costs and latency by cutting token usage 50–92% versus JSON while maintaining perfect fidelity across LLM inference—directly lowering operational spend on high-volume data pipelines.

Best for

Data engineering teams optimizing token efficiency and cost in AI-driven analytics and multi-model data workflows.

Works in

Claude Code Claude Cowork Claude Chat

Source

https://github.com/blackwell-systems/gcf

By blackwell-systems

How to Get It

Option 1: Claude Desktop App (Code Mode)Click the + button next to the prompt box → Plugins → Add plugin. Search and click Install. Skills work in Claude Code only.

Option 2: Paste into Claude CodeCopy the command below and paste it into your conversation. Claude will install it.

Command

claude plugins install blackwell-systems/gcf

Tip: Paste this into a Claude Code conversation. Verify command matches your Claude Code version.

Auto-generated from the tool's public listing — not hands-on verified. Cross-check against the source repo's README before running.

First thing to try

After installing, paste this into Claude:

Help me reduce API payload sizes by converting JSON data to GCF format for faster transfers

CostFree

Trust Signals Auto-scanned

Stars26Contributors2Last updated2026-07-25LicenseMIT (OK for commercial use)Known CVEsNone foundSources: GitHub Advisory Database + OSV.dev · Scanned 2026-07-25 · scanner v1

Community Pulse New

No community discussions found yet. This doesn't mean the tool isn't good — it may be new or serve a niche use case.

Reviewer notes

Auto-scanned review. These are observations, not a security certification.

Scored from trust signals (evidence-eval-v1): 26 GitHub stars; 2 contributors; last commit 0d ago; license MIT.

Things to check

Scanned, not hands-on tested — this entry was auto-scanned from public metadata (GitHub metrics, license, security flags). No reviewer has run it, and no tool-specific limitations have been documented yet.

How to evaluate tools before deploying →

Data shown here comes from public APIs and automated scanning. Reviewer notes reflect one person's experience. This is not a security certification or legal recommendation. Always evaluate tools according to your own organization's policies.

Evaluation Scores

Evaluation

Ease of Use

3/5

Versatility

2/5

Reliability

3/5

Security

3/5

Overall score2.75 / 5.00 UsableEvaluatedJul 2026

Scored from trust signals (evidence-eval-v1): 26 GitHub stars; 2 contributors; last commit 0d ago; license MIT.

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