Kafka Schema Registry vs alloydb
Kafka Schema Registry is an MCP server published by aywengo. Marketplaces we read that list it: 1 (Docker MCP Catalog). alloydb is a plugin bundle for AI coding tools published by gemini-cli-extensions. Marketplaces we read that list it: 3 (Claude Code: claude-plugins-official, Claude Code: claude-plugins-community, Community GitHub marketplaces). As of our marketplace pass on 2026-10-16. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |   Kafka Schema Registry |  alloydb |
|---|---|---|
| Docker MCP Catalog | Listed Version: sha256:651147289d87 Forks (GitHub): 9 Stars (GitHub): 32 Not marked · First seen |
Not listed |
| Claude Code: claude-plugins-official | Not listed | Listed Version: 0.2.0 Forks (GitHub): 6 Stars (GitHub): 24 Not marked · First seen |
| Claude Code: claude-plugins-community | Not listed | Listed Version: 0.2.0 Forks (GitHub): 6 Stars (GitHub): 24 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Kafka Schema Registry | alloydb |
|---|---|---|
| Marketplaces that list it (differs) | 1 (worse) | 3 (better) |
| Stars (GitHub) (differs) | 32 (worse) | 42 (better) |
| Forks (GitHub) (differs) | 9 (better) | 7 (worse) |
| Last release (differs) | Not published | 2026-10-16 |
| Where it runs (differs) | On your machine (aywengo/kafka-schema-reg-mcp:stable) | On your machine (@toolbox-sdk/server) |
| Transport (differs) | stdio | Not stated |
| Tools it declares (differs) | 29 | Not published |
| Environment variables it asks for (differs) | 5, secrets among them: 2 | 8, secrets among them: 1 |
| Parts of the bundle (differs) | Not a bundle | 8 |
| Licence (differs) | MIT | Apache-2.0 |
| Repository (differs) | github.com/aywengo/kafka-schema-reg-mcp | github.com/gemini-cli-extensions/alloydb |
| Changes in the last 7 days (differs) | 0 | 20 or more |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Kafka Schema Registry
Comprehensive MCP server for Kafka Schema Registry operations. Features multi-registry support, schema contexts, migration tools, OAuth authentication, and 57+ tools for complete schema management. Supports SLIM_MODE for optimal performance.
alloydb
Create, connect, and interact with an AlloyDB for PostgreSQL database and data.
How to run each
Kafka Schema Registry As a local MCP server: Docker image
claude mcp add --env "SCHEMA_REGISTRY_PASSWORD=<YOUR_SCHEMA_REGISTRY_PASSWORD>" --env "SCHEMA_REGISTRY_USER=<YOUR_SCHEMA_REGISTRY_USER>" --transport stdio kafka-schema-reg-mcp -- docker run -i --rm -e SCHEMA_REGISTRY_PASSWORD -e SCHEMA_REGISTRY_USER aywengo/kafka-schema-reg-mcp:stableRequires: SCHEMA_REGISTRY_PASSWORD (secret), SCHEMA_REGISTRY_USER (secret)
alloydb As a Claude Code plugin
/plugin install alloydb@claude-plugins-officialCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
The marketplaces of alloydb publish no list of tools, so we do not compare tools.
Settings each asks for
Only Kafka Schema Registry asks for
SCHEMA_REGISTRY_PASSWORD (secret)SCHEMA_REGISTRY_URLSCHEMA_REGISTRY_USER (secret)SLIM_MODEVIEWONLY
Only alloydb asks for
ALLOYDB_POSTGRES_CLUSTERALLOYDB_POSTGRES_DATABASEALLOYDB_POSTGRES_INSTANCEALLOYDB_POSTGRES_IP_TYPEALLOYDB_POSTGRES_PASSWORD (secret)ALLOYDB_POSTGRES_PROJECTALLOYDB_POSTGRES_REGIONALLOYDB_POSTGRES_USERCLOUD_SQL_MSSQL_DATABASECLOUD_SQL_MSSQL_INSTANCECLOUD_SQL_MSSQL_IP_TYPECLOUD_SQL_MSSQL_PASSWORD (secret)
Show the remaining 31
CLOUD_SQL_MSSQL_PROJECTCLOUD_SQL_MSSQL_REGIONCLOUD_SQL_MSSQL_USERCLOUD_SQL_MYSQL_DATABASECLOUD_SQL_MYSQL_INSTANCECLOUD_SQL_MYSQL_IP_TYPECLOUD_SQL_MYSQL_PASSWORD (secret)CLOUD_SQL_MYSQL_PROJECTCLOUD_SQL_MYSQL_REGIONCLOUD_SQL_MYSQL_USERCLOUD_SQL_POSTGRES_DATABASECLOUD_SQL_POSTGRES_INSTANCECLOUD_SQL_POSTGRES_IP_TYPECLOUD_SQL_POSTGRES_PASSWORD (secret)CLOUD_SQL_POSTGRES_PROJECTCLOUD_SQL_POSTGRES_REGIONCLOUD_SQL_POSTGRES_USERDATAPLEX_PROJECTDATAPROC_PROJECTDATAPROC_REGIONFIRESTORE_DATABASEFIRESTORE_PROJECTORACLE_CONNECTION_STRINGORACLE_PASSWORD (secret)ORACLE_USERNAMEORACLE_USE_OCIORACLE_WALLETSPANNER_DATABASESPANNER_DIALECTSPANNER_INSTANCESPANNER_PROJECT
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: Kafka Schema Registry · What it can do: alloydb · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-official/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from public marketplace files in GitHub repositories of their authors. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.