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3GPP MCP Server

by gholtzap
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3GPP MCP Server

MCP server that exposes 3GPP Release 18 OpenAPI specifications as tools for AI assistants. Built on the 5GC_APIs spec collection.

Tools

Tool

Description

list_specs

List available specs, optionally filtered by keyword

list_specs_by_nf

Group specs by Network Function (AMF, SMF, UDM, etc.)

get_spec_info

Get metadata (title, version, servers) for a spec

get_paths

List all API endpoints in a spec

get_endpoint

Get raw endpoint details ($ref unresolved)

get_endpoint_resolved

Get endpoint with all $refs recursively inlined

list_schemas

List all schema names in a spec

get_schema

Get raw schema definition ($ref unresolved)

get_schema_resolved

Get schema with all $refs recursively inlined

search_specs

Full-text search across all specs (set deep=True for property/enum search)

search_schema_properties

Find all schemas containing a specific field name

find_references

Find cross-spec $ref dependencies

resolve_ref

Resolve a single $ref within or across specs

Related MCP server: OpenAPI MCP Server

Setup

python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Usage

Claude Code

Add to your .mcp.json:

{
  "mcpServers": {
    "3gpp-specs": {
      "command": "/path/to/.venv/bin/python",
      "args": ["/path/to/server.py"]
    }
  }
}

Standalone

python server.py

Testing

source .venv/bin/activate
python test_server.py           # run test suite
python test_server.py --verbose # include output previews

Runs 43 test cases across all 13 tools covering correctness, error handling, and performance. Reports pass/warn/fail with timing breakdown and cold vs warm cache comparison.

Specs

The YAML files are 3GPP Release 18 OpenAPI specifications sourced from jdegre/5GC_APIs.

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