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/gantisstorm/essentials-claude-code/prd-schemanpx skills add GantisStorm/essentials-claude-code --skill prd-schemagit clone --depth 1 https://github.com/GantisStorm/essentials-claude-codeWhat 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 | $0.00018 | $0.01881 |
| Opus 5 | $0.00009 | $0.00941 |
| Sonnet 5 | $0.00004 | $0.00376 |
| Haiku 4.5 | $0.00002 | $0.00188 |
Grade A, and why
prd-schema 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 — 239 lines — stays where its author put it; the contents beside it link to each section on GitHub.
prd.json schema reference from Ralph TUI. Use this when creating, editing, or reviewing .claude/prd/*.json files.
When to Use
Invoke /prd-schema before editing any prd.json file. Invoke /prd-schema validate <path> to check an existing file.
Conversion from Plans
prd.json files are typically created by /tasks-converter from architectural plans (.claude/plans/*-plan.md). The pipeline:
/plan-creator (or /bug-plan-creator, /code-quality-plan-creator)
↓ writes
.claude/plans/{slug}-{hash5}-plan.md
↓ consumed by
/tasks-converter <plan-path>
↓ writes
.claude/prd/<slug>.json
↓ executed by
/tasks-loop or /tasks-swarm or ralph-tui
How plan sections map to prd.json fields:
| Plan Section | prd.json Field |
|---|---|
## Summary |
name, description |
## Files |
One user story per file (typically) |
### Requirements |
acceptanceCriteria[] |
### Reference Implementation |
description (full code copied verbatim) |
### Migration Pattern |
description (before/after code copied verbatim) |
## Dependency Graph |
dependsOn[] (file deps translated to story IDs) |
## Exit Criteria |
acceptanceCriteria[] |
| Plan path | metadata.planReference |
Each story's description must be 100% self-contained — the executor agent receives only the story description, never the source plan. All code, requirements, and verification commands are copied verbatim from the plan into the story.
Schema
Root Object
{
"name": "string (REQUIRED)",
"description": "string (optional)",
"branchName": "string (optional)",
"userStories": ["array (REQUIRED, see below)"],
"metadata": {
"createdAt": "ISO 8601 string (optional)",
"updatedAt": "ISO 8601 string (auto-set on write)",
"version": "string (optional)",
"sourcePrd": "string — path to source PRD markdown (optional)"
}
}
project is accepted as an alias for name, but name is preferred.
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 · 239 lines · 18 tokens per session scan A bd60a510e950
prd-schema is a skill published in the GitHub repository GantisStorm/essentials-claude-code (91 stars, last pushed 6mo ago), licensed Unlicense. It adds 18 tokens to every session and 1,881 once invoked, about $0.0001 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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