fix: Claude Code marketplace plugin structure and install docs

[johnnygreco]

Summary

• Fix plugin structure so Claude Code marketplace correctly discovers the data-designer skill by adding a claude-plugin/ directory with a symlink to skills/, avoiding duplication while maintaining compatibility with skills.sh
• Fix author field in plugin.json (must be an object, not a string)
• Rename marketplace from nvidia-data-designer to nemo-data-designer
• Update Getting Started section in dev notes blog post with correct install commands, /reload-plugins step, skills.sh link, and agent compatibility note

Test plan

Verified end-to-end locally: removed existing marketplace, re-added from local repo, installed plugin, reloaded, and confirmed /data-designer skill is invocable.

[greptile-apps]

Greptile Summary

This PR fixes the Claude Code marketplace plugin structure for the data-designer skill by introducing a claude-plugin/ wrapper directory — containing its own plugin.json and a symlink to the existing skills/ tree — so both the Claude Code marketplace and skills.sh can discover the skill from a single source of truth without duplication.

Key changes:

• New claude-plugin/ directory: Top-level plugin.json (named nemo-data-designer) acts as the marketplace wrapper; a symlink claude-plugin/skills → ../skills surfaces the skill subtree without copying files.
• marketplace.json updated: Source redirected from ./skills/data-designer to ./claude-plugin, and the marketplace identifier renamed from nvidia-data-designer to nemo-data-designer.
• author field fixed in both plugin.json files: changed from a bare string to the required {"name": "..."} object form.
• Docs updated: README.md and the dev-notes blog post now show the correct three-step install flow (/plugin marketplace add, /plugin install data-designer@nemo-data-designer, /reload-plugins), the skills.sh alternative, and a compatibility note about Claude Code being the primary tested agent.

Confidence Score: 5/5

• This PR is safe to merge — all changes are structural/documentation fixes with no runtime logic, the author verified the install end-to-end, and prior review concerns have been addressed.
• All six files contain targeted, low-risk fixes: a directory restructure using a symlink (git-safe for the supported install path), a JSON field type correction, a rename, and documentation updates. No application logic is touched. Prior review threads on the name mismatch and symlink ZIP-download limitation were both resolved with satisfactory explanations. No new issues remain.
• No files require special attention.

Important Files Changed

Filename	Overview
.claude-plugin/marketplace.json	Renames marketplace from nvidia-data-designer to nemo-data-designer and updates plugin source from ./skills/data-designer to ./claude-plugin to point to the new wrapper directory. Structurally correct.
claude-plugin/.claude-plugin/plugin.json	New top-level plugin wrapper descriptor for nemo-data-designer. Uses object form for author field, matching the fix applied to the leaf-level plugin.json. Plugin-name-vs-marketplace-name distinction intentional (discussed in prior review).
claude-plugin/skills	New symlink claude-plugin/skills → ../skills. Enables the claude-plugin/ source tree to contain the skills/data-designer leaf without duplicating files. ZIP-download limitation acknowledged and accepted in prior review thread.
skills/data-designer/.claude-plugin/plugin.json	Fixes author field from a bare string to the required object form {"name": "..."}. Clean one-line fix.
README.md	Adds a new "Agent Skill" section with correct install commands for both Claude Code marketplace and skills.sh paths, including the /reload-plugins step.
docs/devnotes/posts/data-designer-got-skills.md	Updates Getting Started section with corrected install commands, adds skills.sh link, /reload-plugins step, agent compatibility note, and a tip about selecting Claude Code during skills.sh installation.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Claude Code Marketplace] -->|"marketplace add NVIDIA-NeMo/DataDesigner"| B[".claude-plugin/marketplace.json\nname: nemo-data-designer"]
    B -->|"source: ./claude-plugin"| C["claude-plugin/\n.claude-plugin/plugin.json\nname: nemo-data-designer"]
    C -->|symlink| D["claude-plugin/skills → ../skills"]
    D --> E["skills/data-designer/\n.claude-plugin/plugin.json\nname: data-designer"]
    E -->|"skill discovered as"| F["/data-designer skill"]

    G["skills.sh\nnpx skills add NVIDIA-NeMo/DataDesigner"] -->|"scans repo root skills/"| E

    style F fill:#22c55e,color:#fff
    style C fill:#3b82f6,color:#fff
    style D fill:#f59e0b,color:#fff

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[johnnygreco]

seemed reasonable to add this too