#XSLT MCP Server

An MCP server that gives AI agents access to XSLT spec reference and the PhoenixmlDb XSLT engine. Look up instructions, functions, and error codes. Validate and execute stylesheets.

#Install

#Self-contained binary (no .NET required)

Download from GitHub Releases:

#.NET tool

dotnet tool install -g xslt-mcp
                          

#Configure

#Claude Code

Add to .mcp.json in your project root:

{
  "mcpServers": {
    "xslt": {
      "command": "xslt-mcp"
    }
  }
}
                          

#Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "xslt": {
      "command": "xslt-mcp",
      "args": []
    }
  }
}
                          

#Tools

#Spec Reference

• xslt_lookup_instruction — Look up any XSLT instruction (attributes, content model, examples)

• xslt_lookup_function — Look up XPath/XSLT functions (signature, parameters, return type)

• xslt_lookup_output_method — Look up output methods (xml, html, json, text, etc.)

• xslt_lookup_error_code — Look up error codes with descriptions and fix suggestions

• xslt_search — Full-text search across all 295 spec entries

• xslt_list_instructions — List all 74 XSLT instructions

• xslt_list_functions — List all 163 functions by category

#Execution

• xslt_transform — Run an XSLT transformation and get the output

• xslt_validate — Compile a stylesheet without executing

• xpath_evaluate — Evaluate an XPath expression against XML

• xslt_explain_error — Explain an error code with causes and fixes

#Utilities

• xml_validate_schema — Validate XML against an XSD schema

• xml_format — Pretty-print XML

#How It Works

The server bundles 295 spec reference files covering XSLT 3.0/4.0, XPath 3.1, and Functions & Operators. At startup, it loads them into an in-memory index. Lookup tools search the index; execution tools delegate to the PhoenixmlDb.Xslt engine.

When installed as a dotnet tool or self-contained binary, spec files are embedded as assembly resources. For local development, override the spec path:

XSLT_SPEC_PATH=/path/to/spec xslt-mcp
                          

#Source

github.com/phoenixmldb/xslt-mcp