opsx-feature-dev

A documented workflow for developing a software feature with OpenSpec, a method of recording exploration, design decisions, and implementation tasks in structured documents. It combines codebase investigation with architecture and implementation planning.

In plain words
What is it for?
Use it to explore an existing codebase, clarify requirements, design the implementation, create OpenSpec documents, and build a new feature through a guided process.
Why use it?
Feature work can go wrong when developers start coding before understanding the existing code and unclear requirements. The workflow records decisions and keeps the work traceable so it can be resumed or reviewed.

Plugin for Claude Code

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 mbertani/opsx-feature-dev
agentmods
npx agentmods add plugins/mbertani/opsx-feature-dev/marketplace
Clone the repo
git clone --depth 1 https://github.com/mbertani/opsx-feature-dev

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

opsx-feature-dev 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 · 18 lines

What it actually says

{
  "name": "opsx-feature-dev",
  "description": "Feature development workflow with OpenSpec artifact-driven documentation",
  "owner": {
    "name": "mbertani"
  },
  "plugins": [
    {
      "name": "opsx-feature-dev",
      "description": "Feature development workflow that combines deep codebase exploration, architecture design, and implementation with OpenSpec artifact-driven documentation",
      "source": "./",
      "author": {
        "name": "mbertani"
      }
    }
  ]
}
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.

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.

  1. yesterday First seen · 18 lines scan A 12d225fd1a5a

Subscribe to this mod's changes

opsx-feature-dev is a plugin published in the GitHub repository mbertani/opsx-feature-dev (4 stars, last pushed 4mo 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.