A plugin marketplace package containing stem, an engineering workflow for coding agents. It covers planning work, recording changes, checking results against the request, and preserving session context.

Use it to size tasks, plan before coding, maintain work logs and planning documents, verify completed work, and protect continuity across sessions.

It helps keep agent-led development organised and leaves a written record of decisions and changes.

stem — Plugin by markskrypka

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 markskrypka/stem

agentmods

npx agentmods add plugins/markskrypka/stem/marketplace

Clone the repo

git clone --depth 1 https://github.com/markskrypka/stem

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

stem 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 · 25 lines

What it actually says

{
  "name": "stem",
  "metadata": {
    "description": "Engineering discipline for coding agents: size the work, keep every change on the record, verify against intent, never lose a session."
  },
  "owner": {
    "name": "Mark Skrypka"
  },
  "plugins": [
    {
      "name": "stem",
      "description": "One skill carrying the whole discipline, two agents, per-host session protection. Plan first, build clean, keep every change on the record. stem.cooking",
      "version": "0.1.0",
      "author": {
        "name": "Mark Skrypka"
      },
      "source": "./",
      "category": "development",
      "homepage": "https://stem.cooking",
      "repository": "https://github.com/markskrypka/stem",
      "tags": ["engineering", "discipline", "workflow", "planning", "worklog", "skills", "agents"]
    }
  ]
}

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 555 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 · 25 lines scan A 0f5b8f5c109d

Subscribe to this mod's changes

stem is a plugin published in the GitHub repository markskrypka/stem (2 stars, last pushed 27d ago), licensed Apache-2.0. 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.

Planning Productivity agent-skills ai-agents claude-code claude-code-plugin claude-code-plugins-marketplace cursor

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stem

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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