A guided process for exploring and documenting an engineering concept from early ideas to a researched concept document. It keeps the work focused on capabilities and problems before considering specific implementations.

Use it for concept exploration, feasibility studies, concept-of-operations work, or early system planning when you need both a concept document and a comparison of solution options.

It gives open-ended ideas a sequence of research, problem definition, functional architecture, gap analysis, and documentation. The process records evidence and uncertainty along the way.

concept-dev — Skill for Claude Code by ddunnock/claude-plugins

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add ddunnock/claude-plugins

Claude Code

/plugin install concept-dev

Made for: Claude Code.

Or install concept-dev, the plugin that ships this one along with the rest of its 1 skill, 9 commands, 7 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ddunnock/claude-plugins/concept-dev/github.svg)](https://agentmods.dev/skills/ddunnock/claude-plugins/concept-dev)

Your own site

<a href="https://agentmods.dev/skills/ddunnock/claude-plugins/concept-dev"><img src="https://agentmods.dev/badge/skills/ddunnock/claude-plugins/concept-dev/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ddunnock/claude-plugins/concept-dev"><img src="https://agentmods.dev/badge/skills/ddunnock/claude-plugins/concept-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,518 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00081	$0.02518
Opus 5.5	$0.00032	$0.01007
Sonnet 5.5	$0.00016	$0.00504
Haiku 4.5	$0.00008	$0.00252

Measured 1mo ago against content hash 765ca5a044bc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

concept-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 1mo ago.

The scan reads SKILL.md. This mod also ships 8 executable files (hooks/scripts/update-state-on-write.sh, scripts/assumption_tracker.py, scripts/check_tools.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/concept-dev/SKILL.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Concept Development (NASA Phase A)

Walk users through the engineering concept lifecycle — from wild ideas to a polished concept document with cited research. The process remains solution-agnostic through most phases, identifying solution OPTIONS (not picking them) only at the drill-down phase.

Overview

This skill produces two deliverables:

Concept Document — Problem, concept, capabilities, ConOps, maturation path (modeled on engineering concept papers)
Solution Landscape — Per-domain approaches with pros/cons, cited references, confidence ratings

Read the full file on GitHub · 118 lines

Files

What ships with it

43 files beside SKILL.md 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.

1mo ago First seen · 118 lines · 81 tokens per session scan A 765ca5a044bc

Subscribe to this mod's changes

concept-dev is a skill published in the GitHub repository ddunnock/claude-plugins (14 stars, last pushed 7mo ago), licensed MIT. It adds 81 tokens to every session and 2,518 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.

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