# platform plugin

Claude Code expert guidance, prompt engineering, mermaid diagrams, artifact upload, and skill scaffolding.

The `platform` plugin is a standalone reference plugin that ships five auto-triggered skills. It has no slash commands — skills activate based on context.

## [Skills (5)](/content/docs/mechanisms/plugins/platform#skills-5/index.html)

### [claude-code-expert](/content/docs/mechanisms/plugins/platform#claude-code-expert/index.html)

Quick reference for Claude Code:

- YAML frontmatter patterns for agents, commands, and skills
- 10 hook event types
- 14 hook recipes
- Decision framework: when to build a skill vs an agent vs a command vs a plugin
- Style requirements (imperative voice, not second-person)

References include: `agent-patterns.md`, `command-patterns.md`, `configuration.md`, `hook-recipes.md`, `skill-triggers.md`, and `sub-agents-config.schema.json`.

### [context-engineering](/content/docs/mechanisms/plugins/platform#context-engineering/index.html)

9 techniques ranked by effectiveness:

1. Be clear and direct
2. Multishot examples
3. Chain of thought
4. XML tags
5. Role prompting
6. Prefill response
7. Chain prompts
8. Long context tips (200K-token patterns: data at top, XML doc structure, grounding quotes)
9. Extended thinking (for STEM and constraint optimization)

### [mermaid-visualizer](/content/docs/mechanisms/plugins/platform#mermaid-visualizer/index.html)

6 diagram types with a syntax reference listing prohibited symbols and safe alternatives. Used to generate architecture and flow diagrams inside docs or plans.

### [upload-artifact](/content/docs/mechanisms/plugins/platform#upload-artifact/index.html)

Two modes for getting artifacts into ClosedLoop.ai:

**Script mode** — runs `scripts/upload_artifact.py` under `uv` as a direct Streamable-HTTP MCP client. The file content does not enter the conversation context.

Required environment:

- `CLOSEDLOOP_API_KEY`
- `NEXT_PUBLIC_MCP_SERVER_URL`

Flags:
```
--url --api-key --list-projects --file --title
--type PRD|IMPLEMENTATION_PLAN|TEMPLATE
--project-id --workstream-id --artifact-id --verify
```

**MCP fallback** — uses `mcp__closedloop__create-artifact` or `mcp__closedloop__create-artifact-version`. Loads file content into context.

### [claude-creator](/content/docs/mechanisms/plugins/platform#claude-creator/index.html)

Scaffolds a new skill with `SKILL.md`, `references/`, `scripts/`, and `assets/`. Ships:

- `init_skill.py` — scaffold
- `package_skill.py` — package for distribution
- `quick_validate.py` — local validation

## [Why these skills ship together](/content/docs/mechanisms/plugins/platform#why-these-skills-ship-together/index.html)

They are the toolbelt for **working inside ClosedLoop.ai**:

- claude-code-expert teaches you the framework.
- context-engineering teaches you how to prompt.
- mermaid-visualizer teaches you to diagram.
- upload-artifact lets you push work back into the control plane.
- claude-creator lets you extend the system.

The `platform` plugin is the recommended first install for anyone learning how to build inside the ClosedLoop.ai ecosystem.