Marketplace install fails: unsupported `git-subdir` source type causes schema validation error

Bug Report

Claude Code version: 2.1.78
OS: macOS 25.2.0 (Darwin)

Description

Installing from the official Claude marketplace fails with a schema validation error because marketplace.json in anthropics/claude-plugins-official now contains plugins that use a "git-subdir" source type, which is not supported by the current Zod schema in Claude Code.

Error Message

Failed to parse marketplace file at /Users/.../.claude/plugins/marketplaces/temp_XXXX/.claude-plugin/marketplace.json:
Invalid schema: plugins.56.source: Invalid input, plugins.63.source: Invalid input,
plugins.67.source: Invalid input, plugins.71.source: Invalid input,
plugins.72.source: Invalid input, plugins.73.source: Invalid input,
plugins.74.source: Invalid input, plugins.75.source: Invalid input,
plugins.81.source: Invalid input

Root Cause

The official marketplace has 9 plugins that use a new "git-subdir" source type:

{"source": "git-subdir", "url": "zapier/zapier-mcp", "path": "plugins/zapier", "ref": "main", "sha": "..."}

Claude Code 2.1.78 only recognises these source types in its Zod schema: github, npm, pip, url, local. Any plugin with source: "git-subdir" fails validation, which causes the entire marketplace to be rejected — even plugins that use valid source types cannot be browsed or installed.

Affected Plugins (indices in marketplace.json)

| Index | Plugin |
|-------|--------|
| 56 | semgrep (via mcp-marketplace) |
| 63 | railway |
| 67 | legalzoom |
| 71 | amazon-location-service |
| 72 | aws-serverless |
| 73 | migration-to-aws |
| 74 | deploy-on-aws |
| 75 | zapier |
| 81 | neon-postgres |

Steps to Reproduce

1. Run /plugin install or open the marketplace in any Claude Code session
2. Claude Code fetches anthropics/claude-plugins-official and tries to parse marketplace.json
3. Zod validation fails on any plugin entry with "source": "git-subdir"
4. The entire marketplace is rejected — no plugins can be browsed or installed

Expected Behaviour

The git-subdir source type should be supported (fetching a plugin from a subdirectory of a Git repo), or plugins with unrecognised source types should be skipped/warned about gracefully rather than causing the whole marketplace to fail.

Workaround

Individual plugins with supported source types can still be installed by full ID, e.g.:

/plugin install frontend-design@claude-plugins-official

But any plugin using git-subdir cannot be installed until the CLI is updated.