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.
/plugin marketplace add ddunnock/claude-plugins/plugin install concept-devWrote 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.
[](https://agentmods.dev/commands/ddunnock/claude-plugins/concept.document)<a href="https://agentmods.dev/commands/ddunnock/claude-plugins/concept.document"><img src="https://agentmods.dev/badge/commands/ddunnock/claude-plugins/concept.document/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.
<a href="https://agentmods.dev/commands/ddunnock/claude-plugins/concept.document"><img src="https://agentmods.dev/badge/commands/ddunnock/claude-plugins/concept.document.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00023 | $0.01625 |
| Opus 5.5 | $0.00009 | $0.00650 |
| Sonnet 5.5 | $0.00005 | $0.00325 |
| Haiku 4.5 | $0.00002 | $0.00162 |
Grade A, and why
concept:document 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.
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 — 265 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/concept:document
Phase 5 of concept development: document generation.
Prerequisites
Run the prerequisite gate check:
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/update_state.py --state .concept-dev/state.json check-gate document
If this exits non-zero, stop and tell the user to complete the previous phase first.
Then load context:
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/update_state.py --state .concept-dev/state.json show- Read all artifacts:
.concept-dev/IDEAS.md.concept-dev/PROBLEM-STATEMENT.md.concept-dev/BLACKBOX.md.concept-dev/DRILLDOWN.md
Procedure
Step 1: Set Phase
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/update_state.py --state .concept-dev/state.json set-phase document
Step 2: Pre-Generation Review
Present a summary of all inputs:
===================================================================
DOCUMENT GENERATION
===================================================================
Inputs:
IDEAS.md — [N] themes, [N] ideas
PROBLEM-STATEMENT — [1-sentence summary]
BLACKBOX.md — [N] functional blocks, [Approach name]
DRILLDOWN.md — [N] sub-functions, [N] sources, [N] gaps
I will generate two documents:
1. CONCEPT DOCUMENT
Modeled on engineering concept papers:
Exec Summary → Problem → Concept → Capabilities →
ConOps → Maturation Path → Glossary
2. SOLUTION LANDSCAPE
Per-domain approaches with pros/cons, citations,
confidence ratings, and unresolved gaps
Each section will be presented for your approval before
being included in the final document.
Ready to begin?
===================================================================
Step 3: Mandatory Assumption Review
Before generating any document content, run the assumption review gate:
python3 ${CLAUDE_PLUGIN_ROOT}/scripts/assumption_tracker.py --registry .concept-dev/assumption_registry.json review
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 · 265 lines · 23 tokens per session scan A 1f34dcebc58d
concept:document is a command published in the GitHub repository ddunnock/claude-plugins (14 stars, last pushed 7mo ago), licensed MIT. It adds 23 tokens to every session and 1,625 once invoked, about $0.0001 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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