GCF Proxy icon

GCF Proxy

blackwell-systems/gcf-proxy · v1.0.0 · Development & Workflow

by blackwell-systemsScan grade: caution

Save 71% on MCP tool call tokens by wrapping any server with GCF encoding, with session stats hook and setup skill.

InstallSourceClaim this plugin
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Trust Score67Security scan59Components2
Protect this install with HOL Guard

Guard checks the skills and MCP servers a plugin adds on your machine and asks you before a risky action runs. The scores above are free, and no plan changes them.

Is GCF Proxy a fit?

From the plugin's manifest and HOL's scan. Anything the plugin does not declare is shown as not declared.

Works with

  • MCP
  • Codex
  • 2 skills

Before you install

Sign-in
Asks you to sign in when you install it
Declared access
Not declared
License
Apache-2.0

Check before relying on it

  • Some security checks did not finish: Cisco skill scan and HOL plugin scan. See the evidence
  • 3 medium findings from the scan. See the evidence
  • The publisher has not verified ownership on HOL.

What is GCF Proxy?

GCF Proxy is a published development & workflow plugin for AI coding agents that works with MCP and Codex, developed by blackwell-systems and distributed through the HOL AI plugin registry. Save 71% on MCP tool call tokens by wrapping any server with GCF encoding, with session stats hook and setup skill.

Canonical slug
blackwell-systems/gcf-proxy
Version
v1.0.0 · updated Sep 23, 2026

Registry snapshot

Owner verification
Not verified
Scanner
Registry fallback scan
Security result
Caution
Digest verified
Yes
2 bundled skillsRead, copy or download each SKILL.mdOpen skills

Trust and security

Trust & reputation

67

HOL Trust Score

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability
64/100
Maintenance
55/100
MCP server setup
100/100
Plugin Security
59/100
Provenance
70/100
Publisher Quality
75/100

Provenance

Plugin root
.
Source repo
https://github.com/blackwell-systems/gcf-codex-plugin
Source commit
0fbc38f0e0ff…
Publisher verified
No
Owner verified
Not owner verified

Continuous scanner CI detected

No action is required. This plugin receives the full trust score.

README badge not detected

Plugin owners can add the HOL badge to the repository README from Guard Plugins. Distribution, not security evidence. It adds a 2% engagement adjustment to the overall trust score and never changes the security result.

Security posture

See how the Trust Score is computed
Caution
Security result
59
Security score
0
High findings
Provider
registry-broker-fallback
Grade
F · caution
Version
Unknown
cisco-skill-scanner: unknown

Published advisories

None matched in GitHub security advisories, checked . This covers published advisories only, not problems nobody has reported.

GitHub security advisories are those the source repository has published.

Findings

mediumpublishabilitypublishability.link.missing.websiteURL

websiteURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.privacyPolicyURL

privacyPolicyURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.termsOfServiceURL

termsOfServiceURL should be present for marketplace readiness.

lowoperational-securitysupply-chain.lockfile-missing

Repository snapshot does not include a lockfile.

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

Install guidance

Install in Codex

Install through the Codex CLI plugin marketplace.

Codex plugin docs

Optional: install HOL Guard for Codex first, so it can check this plugin's tools on your machine before Codex uses them.

  1. 1

    Register the marketplace

    Run in any terminal. Codex reads the marketplace entry from .agents/plugins/marketplace.json (or the legacy .claude-plugin path) in the repository. If the repository ships none, add the generated entry from the Advanced section below first.

    shell
  2. 2

    Install from the Plugins browser

    Open Codex, open the Plugins browser, choose the marketplace registered by the previous command, and install gcf-proxy.

  3. 3

    Check the marketplace is registered

    This confirms the marketplace source only. Confirm the plugin itself is enabled in the Plugins browser before relying on it.

    shell

Did setup work in Codex?

No setup reports for Codex yet. Self-reported by signed-in visitors. Copying a command is not counted, and most installs are never reported.

Attested installs: Fewer than 10 attested installs of this plugin in week 2026-W43, so no number is shown. Counted from opt-in HOL Guard install reports, once per machine and runtime, and never mixed with the answers above. How install reports work.

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Plugin manifest

{
  "name": "gcf-proxy",
  "version": "1.0.0",
  "description": "Save 71% on MCP tool call tokens. Wraps any MCP server with GCF encoding, zero code changes. Session stats hook shows savings per turn.",
  "repository": "https://github.com/blackwell-systems/gcf-codex-plugin",
  "license": "Apache-2.0",
  "author": {
    "name": "Blackwell Systems",
    "url": "https://blackwell-systems.com"
  },
  "homepage": "https://gcformat.com",
  "keywords": [
    "mcp",
    "proxy",
    "token-optimization",
    "gcf",
    "cost-reduction"
  ],
  "interface": {
    "displayName": "GCF Proxy",
    "developerName": "blackwell-systems",
    "shortDescription": "Save 71% on MCP tool call tokens with GCF encoding.",
    "composerIcon": "./assets/icon.svg",
    "links": {
      "documentation": "https://gcformat.com/guide/claude-code.html",
      "repository": "https://github.com/blackwell-systems/gcf-codex-plugin",
      "homepage": "https://gcformat.com"
    }
  },
  "skills": "./",
  "registryIndexVersion": 5
}

Marketplace source

Repo URL
https://github.com/blackwell-systems/gcf-codex-plugin
Marketplace path
Unknown
Source path
plugins/blackwell-systems/gcf-codex-plugin
Install policy
AVAILABLE

Skills

2 SKILL.md files ship with this plugin. Preview, copy, or download each one, then install them with the Skills CLI.

Share
skills-cli

  • setup

    skills/setup/SKILL.md

    Wrap an existing MCP server with gcf-proxy to reduce token costs by 71%. Provide the server name from your MCP config.

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

  • stats

    skills/stats/SKILL.md

    Show GCF proxy token savings statistics for the current session or overall usage.

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

File inventory

.codex-plugin/plugin.json

plugin-manifest

861 bytes

9a7bbd3441af0116…

assets/icon.svg

asset

1,148 bytes

bbfebd629f33186a…

hooks/hooks.json

file

887 bytes

c30e4e52a566c854…

README.md

file

2,382 bytes

a388b77d1d83d216…

SECURITY.md

file

701 bytes

008ca07dff3672bb…

skills/setup/SKILL.md

skill

1,810 bytes

c65332bba3ae5fa7…

skills/stats/SKILL.md

skill

664 bytes

cb2116335a3bf912…

GCF Proxy — Frequently asked questions

What is GCF Proxy?
GCF Proxy is an AI plugin in the HOL registry. Save 71% on MCP tool call tokens by wrapping any server with GCF encoding, with session stats hook and setup skill.
How do I install GCF Proxy?
Install GCF Proxy in your harness: Codex — codex plugin marketplace add blackwell-systems/gcf-codex-plugin; MCP — git clone https://github.com/blackwell-systems/gcf-codex-plugin; Any agent — npx [email protected] add blackwell-systems/gcf-codex-plugin. Full step-by-step guidance is on the HOL plugin page.
How do I install GCF Proxy in Codex?
To install GCF Proxy in Codex, start with codex plugin marketplace add blackwell-systems/gcf-codex-plugin. The complete step-by-step install guide for Codex is on the HOL plugin page.
How do I install GCF Proxy in MCP?
To install GCF Proxy in MCP, start with git clone https://github.com/blackwell-systems/gcf-codex-plugin. The complete step-by-step install guide for MCP is on the HOL plugin page.
How is the Trust Score for GCF Proxy computed?
GCF Proxy has a HOL Trust Score of 67 out of 100. The score is a weighted sum of six components from a static scan of the source, capped for high-severity findings and adjusted by two disclosed policies. Memberships and payments are not inputs, and a scan is not a safety guarantee. Full breakdown: https://hol.org/registry/plugins/blackwell-systems%2Fgcf-proxy/trust
Who publishes GCF Proxy?
GCF Proxy is published by blackwell-systems and listed on HOL.

Install signal

HOL cannot see every install. These are separate signals from different sources, so they are not added together. Counts under each floor show as <N.

Install commands issued here
<5
HOL Guard install commands issued from this listing, last 28 days.
Opt-in install reports
<10
Machines that reported installing it through HOL Guard in week 2026-W43. Reporting is opt-in, so most installs are not counted.
HOL Guard workspaces
<5
Workspaces that approved it or include it in an approved-plugin feed, as of today.

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