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/sethgammon/citadel/prdnpx skills add SethGammon/Citadel --skill prdgit clone --depth 1 https://github.com/SethGammon/CitadelWhat 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 | $0.00048 | $0.01591 |
| Opus 5 | $0.00024 | $0.00796 |
| Sonnet 5 | $0.00010 | $0.00318 |
| Haiku 4.5 | $0.00005 | $0.00159 |
Grade A, and why
prd 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 3d 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 — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/prd — Product Requirements Document Generator
When to Use
Don't use when: architecture is already defined and you need implementation (use /architect then /archon); adding a small feature to an existing app (use /marshal directly).
- User describes an app or feature to build (greenfield or feature mode)
- Before any Archon campaign for a new project or feature
Mode Detection
Before starting, determine the mode:
Greenfield mode: No existing source files, or user explicitly says "new app" / "from scratch." Produces a full PRD as described below.
Feature mode: The project already has source files (check for src/, app/, lib/,
package.json with dependencies, or similar). The user describes a feature to add, not a
whole app ("add auth", "add a dashboard", "add payment processing").
In feature mode:
- Read the existing file tree and
package.json/equivalent before asking questions - The existing stack is a given — don't recommend alternatives
- "Architecture" section describes integration points with existing code, not standalone shape
- End conditions MUST include regression checks: "existing tests still pass", "typecheck has no new errors"
- "Out of Scope" is relative to the feature, not the whole app
- Technical Decisions only covers decisions the feature introduces (new dependencies, new patterns)
The PRD template below works for both modes. Feature mode just scopes it tighter.
Protocol
Step 1: UNDERSTAND
Determine mode (greenfield vs feature). Identify core functionality, target user, and success criteria (greenfield) or integration points and existing stack (feature). Ask up to 3 questions — only those that would change the architecture. Do not ask about tech stack in greenfield mode; in feature mode, the stack is already decided.
Step 2: RESEARCH (Optional)
If the concept has well-known implementations, run /research to identify 2-3 reference apps and common expected features. Skip for simple concepts (landing page, personal tool, CRUD).
What ships with it
2 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.
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.
- 3d ago First seen · 173 lines · 48 tokens per session scan A a83976ae5708
prd is a skill published in the GitHub repository SethGammon/Citadel (914 stars, last pushed 6d ago), licensed MIT. It adds 48 tokens to every session and 1,591 once invoked, about $0.0002 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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