Name your Sume plugin right: claude- and anthropic- prefixes fail

Do not call a Sume plugin claude-sume or anthropic-sume. The plugin manifest reference says claude plugin validate errors on any name that starts with claude-, anthropic-, anthropics- or cc-plugin-, and on the bare names claude, anthropic, anthropics, claude-code and claude-mods. A name such as sume-media or sume-mcp is clear.

The naming rules in one table

These rules come from the name section of the reference.

Why the name matters beyond the validator

Claude Code namespaces every component under the plugin name. A skill called render in sume-media shows as sume-media:render, so the name is what your teammates will type. Use displayName for a friendlier label with spaces; it does not affect namespacing or lookup.

The reference adds a detail worth knowing: only the init and tag commands and validate check the reserved names. Claude Code still installs and loads a plugin whose name they refuse. So a bad name may not break your machine, but it will fail CI that runs validate, and it implies an affiliation with Anthropic that Sume does not have.

Steps

Create the directory, add .claude-plugin/plugin.json with "name": "sume-media", and run claude plugin validate. Add --strict in CI so warnings fail the build. Then add the MCP server entry for https://mcp.sume.com/mcp, either inline under mcpServers or in a .mcp.json at the plugin root.

• Kebab-case only, no @, : or path separators.
• Set displayName to Sume Media if you want spaces in the UI.
• Declare the Sume URL once; a server name declared later replaces an earlier one.

A quick pre-publish check

Before you share the plugin, read the validator output line by line. The reference separates three results: validation passed, validation passed with warnings, and validation failed. A warning covers things like a name that is not kebab-case or a missing version, description or author. A failure covers type mismatches, paths that escape the plugin root, and unknown keys inside strict objects such as a userConfig option.

Add a version, a description and an author so the warnings stay quiet. Setting version also pins users to that version until you change it, which is useful when a Sume entry changes URL or auth. Anthropic's directory reads listing fields such as documentationUrl and supportUrl only from plugin.json, so keep them there if you plan to submit.

What Sume does not do

This post does not describe an official Sume plugin, and the name you choose implies no endorsement by Sume or Anthropic. The connector itself is the hosted endpoint at https://mcp.sume.com/mcp, which you can reach with OAuth or an API key as described in the Sume hosted MCP docs.