MCP Servers

3GPP MCP Server

Exposes 3GPP Release 18 OpenAPI specifications as tools for AI assistants, enabling querying and searching of 5G network function APIs via natural language.

README

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 (`$ref` unresolved)
get_endpoint_resolved	Get endpoint with all `$ref`s recursively inlined
list_schemas	List all schema names in a spec
get_schema	Get raw schema definition (`$ref` unresolved)
get_schema_resolved	Get schema with all `$ref`s 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

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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