A marketplace definition for the Keystone collection of Claude Code add-ons. Claude Code is a coding assistant that can use extensions for repeatable engineering work.

Use it when publishing or organising the Keystone marketplace and its available add-ons.

It provides the catalogue information needed to discover and install the collection and describes its general focus on planning, implementation, review, shipping, and maintenance.

keystone — Plugin by static-var

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add static-var/Keystone

agentmods

npx agentmods add plugins/static-var/keystone/marketplace

Clone the repo

git clone --depth 1 https://github.com/static-var/Keystone

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

keystone scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json · 29 lines

What it actually says

{
  "$schema": "https://json.schemastore.org/claude-code-marketplace.json",
  "description": "Keystone plugin marketplace for Claude Code.",
  "name": "keystone",
  "owner": {
    "name": "static-var"
  },
  "plugins": [
    {
      "author": {
        "name": "static-var"
      },
      "category": "productivity",
      "description": "Keystone proactive multi-skill AI engineering workflows for planning, implementation, review, shipping, and maintenance.",
      "name": "keystone",
      "source": "./",
      "tags": [
        "workflow",
        "skills",
        "engineering",
        "review",
        "planning"
      ],
      "version": "2.0.4"
    }
  ],
  "version": "2.0.4"
}

Files

What ships with it

1 file beside marketplace.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

plugin.json 379 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 29 lines scan A 75a60c3e1be0

Subscribe to this mod's changes

keystone is a plugin published in the GitHub repository static-var/Keystone (4 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Productivity agent-skills ai-agents pi-coding-agent skills workflow

keystone

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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