Add missing .claude-plugin/marketplace.json so the documented install paths work - #1
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Talnerith wants to merge 1 commit into
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Add missing .claude-plugin/marketplace.json so the documented install paths work#1Talnerith wants to merge 1 commit into
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…lace The README instructs installing this plugin by registering the repo directory as a marketplace (both `/plugin marketplace add <dir>` and an `extraKnownMarketplaces` directory source). Claude Code requires a `.claude-plugin/marketplace.json` manifest to register any directory as a marketplace -- it does not synthesize one from a bare `plugin.json`. Because the manifest was absent, both documented install paths failed: `/plugin marketplace add` errors with "File not found: .claude-plugin/marketplace.json", and the `extraKnownMarketplaces` directory-source path fails silently -- the plugin and its skills (`unreal-mcp`, `unreal-skill`, `create-toolset`) never load, with no error surfaced. The plugin still works via dev paths that skip the marketplace (`claude --plugin-dir`, skills-directory auto-load), which likely masked the gap. Changes: - Add `.claude-plugin/marketplace.json` listing this single plugin (`source: "./"`), named `unreal-engine-skills-for-claude-code` to match the plugin and README Option A. - README: correct the "no marketplace.json" sentence; fix the claim that the marketplace name derives from the directory name (it comes from the `name` field in marketplace.json); reconcile the Option B example so the `enabledPlugins` reference uses the marketplace name, not the alias key. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
The README documents installing this plugin by registering the repo directory as a marketplace — both interactively (
/plugin marketplace add <dir>) and declaratively (extraKnownMarketplaceswith adirectorysource). Neither works as written, because the repo ships.claude-plugin/plugin.jsonbut no.claude-plugin/marketplace.json.Claude Code requires a
.claude-plugin/marketplace.jsonmanifest to register any directory as a marketplace; it does not synthesize one from a bare plugin manifest. With the file absent:/plugin marketplace add <dir>) errors:File not found: .claude-plugin/marketplace.json.extraKnownMarketplacesdirectory source) fails silently — the marketplace never resolves, so the plugin and its skills (unreal-mcp,unreal-skill,create-toolset) never load, and no error is surfaced. The symptom is easily misattributed to restart timing or a stale session.The plugin still works through dev paths that bypass the marketplace (
claude --plugin-dir, skills-directory auto-load), which likely masked the gap during development.Refs (Claude Code docs):
.claude-plugin/marketplace.json; missing manifest is a documented validation error.namefield inmarketplace.json, not the directory name, and is independent of theextraKnownMarketplaceskey.Changes
.claude-plugin/marketplace.json— lists this single plugin ("source": "./"), namedunreal-engine-skills-for-claude-codeto match the plugin and the README Option A install command.marketplace.json" sentence (the repo now ships one).namefield inmarketplace.json.enabledPluginsreference must use the marketplace name (...@unreal-engine-skills-for-claude-code), not the arbitraryextraKnownMarketplacesalias key.How I verified
Reproduced the silent Option B failure locally (skills did not load), added
.claude-plugin/marketplace.json, and confirmed all three skills (unreal-mcp,unreal-skill,create-toolset) load after the manifest is present. JSON validated.🤖 Generated with Claude Code