How is Rfcxml Mcp different from existing text-based RFC MCP servers?
Unlike text-based servers, it uses RFCXML structural data to extract requirements, conditions, exceptions, dependencies, and checklists that are not available from plain text.
@shuji-bonji
Basic information
An MCP server that parses RFC documents in XML format,
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"rfcxml": {
"command": "npx",
"args": [
"-y",
"@shuji-bonji/rfcxml-mcp"
]
}
}
}Get RFC section hierarchy and metadata. Metadata is enriched from the IETF Datatracker API (category, stream, publication date, abstract). Pass includeAuthors=true to also resolve author names (incurs extra API calls).
Extract normative requirements (MUST/SHOULD/MAY) from RFC in structured format.
Get term definitions from RFC.
Get RFC reference relationships (normative/informative).
Get sections related to the specified section.
Generate RFC implementation checklist in Markdown format.
Validate if a statement complies with RFC requirements.
Rfcxml Mcp is a Model Context Protocol (MCP) server for structured understanding of RFC documents. It leverages the semantic structure of RFCXML to extract normative requirements (MUST/SHOULD/MAY), build dependency graphs, manage definition scopes, and generate implementation checklists. It is designed for AI assistants and human developers who need precise analysis of RFC specifications.
Add the server to your MCP configuration file (Claude Desktop or Claude Code) using the command npx -y @shuji-bonji/rfcxml-mcp. Optionally install globally via npm install -g @shuji-bonji/rfcxml-mcp and use rfcxml-mcp as the command. Tools are invoked through the MCP client.
Unlike text-based servers, it uses RFCXML structural data to extract requirements, conditions, exceptions, dependencies, and checklists that are not available from plain text.
It has automatic fallback – when official RFCXML is not available, it parses the text format instead, with a note indicating reduced accuracy.
Every response includes a `_source` field (`"xml"` or `"text"`) and a `_sourceNote` when text fallback is used, so you know the reliability of the data.
Tools include `get_rfc_structure`, `get_requirements`, `get_definitions`, `get_rfc_dependencies`, `get_related_sections`, `validate_statement`, and `generate_checklist`.
Add the server entry to your MCP config file (e.g., `~/Library/Application Support/Claude/claude_desktop_config.json` on macOS) with command `npx -y @shuji-bonji/rfcxml-mcp`.

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