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.
npx agentmods add skills/ddunnock/claude-plugins/concept-devnpx skills add ddunnock/claude-plugins --skill concept-devgit clone --depth 1 https://github.com/ddunnock/claude-pluginsWhat 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 | $0.00081 | $0.02518 |
| Opus 5 | $0.00041 | $0.01259 |
| Sonnet 5 | $0.00016 | $0.00504 |
| Haiku 4.5 | $0.00008 | $0.00252 |
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 2d ago.
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.
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
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.
- .claude-plugin/plugin.json 1.1 KB
- .codegraph/index.bin 17 KB
- agents/concept-architect.md 4.4 KB
- agents/document-writer.md 5.7 KB
- agents/domain-researcher.md 7.3 KB
- agents/gap-analyst.md 5.8 KB
- agents/ideation-partner.md 3.7 KB
- agents/problem-analyst.md 4.3 KB
- agents/skeptic.md 5.7 KB
- commands/concept.blackbox.md 6.4 KB
- commands/concept.document.md 7.5 KB
- commands/concept.drilldown.md 9.6 KB
- commands/concept.init.md 4.3 KB
- commands/concept.problem.md 6.8 KB
- commands/concept.research.md 5.4 KB
- commands/concept.resume.md 3.7 KB
- commands/concept.spitball.md 5.3 KB
- commands/concept.status.md 3.4 KB
- hooks/hooks.json 360 B
- hooks/scripts/update-state-on-write.sh 2.8 KB runs code
- HOW_TO_USE.md 9.6 KB
- README.md 7.0 KB
- references/concept-doc-structure.md 2.6 KB
- references/questioning-heuristics.md 4.1 KB
- references/research-strategies.md 5.6 KB
- references/solution-landscape-guide.md 4.2 KB
- references/verification-protocol.md 4.2 KB
- requirements.txt 16 B
- scripts/assumption_tracker.py 24 KB runs code
- scripts/check_tools.py 5.5 KB runs code
- scripts/init_session.py 2.9 KB runs code
- scripts/source_tracker.py 20 KB runs code
- scripts/update_state.py 11 KB runs code
- scripts/utils.py 725 B runs code
- scripts/web_researcher.py 29 KB runs code
- SECURITY.md 3.0 KB
- templates/blackbox.md 2.8 KB
- templates/concept-document.md 3.5 KB
- templates/drilldown.md 2.6 KB
- templates/ideas.md 1.4 KB
- templates/problem-statement.md 2.2 KB
- templates/solution-landscape.md 3.3 KB
- templates/state.json 1.7 KB
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.
- 2d ago First seen · 118 lines · 81 tokens per session scan A 765ca5a044bc
concept-dev is a skill published in the GitHub repository ddunnock/claude-plugins (12 stars, last pushed 5mo ago), licensed MIT. It adds 81 tokens to every session and 2,518 once invoked, about $0.0004 per session on Opus 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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