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/contentrain/ai/contentrainnpx skills add Contentrain/ai --skill contentraingit clone --depth 1 https://github.com/Contentrain/aiWhat 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 | $0.00036 | $0.02045 |
| Opus 5 | $0.00018 | $0.01022 |
| Sonnet 5 | $0.00007 | $0.00409 |
| Haiku 4.5 | $0.00004 | $0.00204 |
Grade A, and why
contentrain 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 — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contentrain Skill
Contentrain is a Git-based, AI-first content management system. Content lives in .contentrain/ as JSON and Markdown files, managed through MCP tools. This skill covers architecture, content formats, and tool usage.
Ecosystem Overview
Contentrain consists of 6 packages that work together:
| Package | Role | How agent uses it |
|---|---|---|
| @contentrain/mcp | 22 MCP tools (scan, apply, validate, merge, reconcile, doctor...) | MCP tool calls |
| contentrain (CLI) | init, serve, generate, doctor, diff, status | Shell commands |
| @contentrain/types | Shared TypeScript contracts | Type safety |
| @contentrain/query | Generated SDK client (Prisma-pattern) | import from '#contentrain' |
| @contentrain/rules | Behavioral guardrails (~86 lines, always-loaded) | Auto-loaded by IDE |
| @contentrain/skills | Procedural workflows (this file) | On-demand by agent |
CLI Serve — Review & Approval Bridge
For workflows requiring human review (normalize, content review):
contentrain serve # http://localhost:3333
| Page | When to use |
|---|---|
| /normalize | Extraction/reuse preview and approval |
| /branches | Merge or delete pending branches |
| /validate | Review validation errors visually |
| /content | Browse models and entries |
Architecture: Agent vs MCP
The system separates intelligence (agent) from infrastructure (MCP tools).
Agent responsibilities:
- Analyze the project (tech stack, architecture, existing patterns)
- Decide what constitutes content vs code
- Assign domain grouping and model structure
- Create replacement expressions (stack-aware:
{t('key')}vs{{ $t('key') }}) - Make all semantic and content decisions
MCP responsibilities:
- Build project graph (import/component relationships)
- Find string candidates (regex + filter)
- Read/write/delete content and models
- Patch source files (exact string replacement)
- Validate against schema rules
- Manage Git transactions (worktree, branch, commit, merge/push)
What ships with it
9 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.
- 2d ago First seen · 199 lines · 36 tokens per session scan A 00fe5efad92d
contentrain is a skill published in the GitHub repository Contentrain/ai (4 stars, last pushed 2d ago), licensed MIT. It adds 36 tokens to every session and 2,045 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 2026-08-31.
Other skills, from other repositories
product-ui-taste
Anti-slop skill for PRODUCT UI - dashboards, data tables, forms, multi-step flows, settings, list/detail, app shells. The agent reads the surface, budgets the frame first, and ships dense interfaces that are correct at every edge case (overflow, long labels, empty/error/loading states, i18n expansion, keyboard/a11y).…
save-progress
Save current project task progress to local task state file for cross-session continuity. Use when the user asks to save progress, uses an equivalent localized trigger phrase, the session is interrupted, or the user wants to resume work later. Writes to .claude/project-task-state.json so next session can load it via…
inclusive-design
Use when working on inclusion, i18n/localization, global name/address forms, low-end devices, slow/metered networks, affordability, or first-time/low-confidence users; not WCAG/screen readers (see accessibility).
flutter-best-practices
Use when writing, reviewing, refactoring, or planning Flutter/Dart code — screens, features, project structure, state management, folders, widgets, cubits/blocs, repositories, services, or tests.
unreal-large-blueprint-analysis
Systematically analyze and translate large UE Blueprints (10+ functions) into C++ or other targets. Use when the user asks to convert a Blueprint to C++, audit a complex Blueprint, or understand a large Blueprint's full logic.
unreal-plugin-localization
翻译 UE 插件本地化 PO 文件。当用户要求本地化、翻译或国际化 Unreal Engine 插件时使用。 处理 GatherText 采集、PO 导出、AI 翻译、PO 导入和 locres 编译的完整流程。.