mcp-gitlab-bedrock-proxy

A thin stdio proxy around @zereight/mcp-gitlab that rewrites tool schemas to be compatible with AWS Bedrock.

Problem

AWS Bedrock's Claude API rejects MCP tool schemas that use oneOf, allOf, or anyOf at the top level of input_schema. @zereight/mcp-gitlab produces such schemas, causing:

tools.N.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level

Solution

This proxy sits between the MCP client and @zereight/mcp-gitlab. It intercepts tools/list responses and replaces any top-level oneOf/allOf/anyOf schema with { type: "object", additionalProperties: true }.

Usage

Via npx (recommended)

No installation required:

"gitlab": {
  "command": "npx",
  "args": ["-y", "mcp-gitlab-bedrock-proxy"],
  "env": {
    "GITLAB_PERSONAL_ACCESS_TOKEN": "glpat-...",
    "GITLAB_API_URL": "https://your-gitlab-instance/api/v4"
  }
}

Global install

npm install -g mcp-gitlab-bedrock-proxy

"gitlab": {
  "command": "mcp-gitlab-bedrock-proxy",
  "env": {
    "GITLAB_PERSONAL_ACCESS_TOKEN": "glpat-...",
    "GITLAB_API_URL": "https://your-gitlab-instance/api/v4"
  }
}

Requirements

• Node.js 18+
• No dependencies — uses only Node.js built-ins