[DOCS] Plugin marketplace npm source docs are outdated for custom registry and version pinning support

Documentation Type

Incorrect/outdated documentation

Documentation Location

https://code.claude.com/docs/en/plugin-marketplaces

Section/Topic

## Plugin sources documentation for npm source (package, version, registry) and implementation status notes.

Current Documentation

The page currently lists npm fields but still warns that npm sources are not fully implemented:

| npm | object | package, version?, registry? | Installed via npm install |

and:

Plugin "x" uses npm source which is not yet fully implemented: use github or local path sources instead

What's Wrong or Missing?

Release v2.1.51 states:

Added support for custom npm registries and specific version pinning when installing plugins from npm sources

The docs still indicate npm source support is not fully implemented, and they do not provide concrete usage examples for:

• Custom npm registry configuration
• Explicit version pinning syntax

This is now outdated/conflicting guidance.

Suggested Improvement

Update plugin-marketplaces to:

• Remove or revise the "not yet fully implemented" npm warning if no longer accurate
• Add a complete npm source example using package, version, and registry
• Document registry authentication expectations and fallback behavior
• Clarify any remaining limitations (if partial support still exists)

Impact

High - Prevents users from using a feature

Additional Context

Affected Pages:

| Page | Context |
|------|---------|
| https://code.claude.com/docs/en/plugin-marketplaces | npm source table and validation warning are inconsistent with new release behavior |

Total scope: 1 page affected

Source: Claude Code release v2.1.51
Changelog entry: "Added support for custom npm registries and specific version pinning when installing plugins from npm sources."