MCP write_document hardcodes XWiki 2.1 syntax but new pages inherit the default wiki syntax

Problem

The write_document MCP tool tells clients to generate XWiki 2.1 content, but it does not set the document syntax when creating a page. The new page inherits the wiki default syntax.

On a wiki configured to use markdown/1.2 by default, XWiki 2.1 content can therefore be stored as Markdown and rendered incorrectly.

Observed with XWiki 18.4.4 and LLM MCP extension 0.9.

Source

Repository: xwiki-contrib/ai-llm
Input schema and instructions (the line that causes the bug): MCPWriteDocumentTool.java lines 169-189

.description("... Write XWiki 2.1 syntax, NOT Markdown ...")

Proposed behavior

• Add an optional syntax parameter to write_document. The parameter identifies both the syntax of content and the syntax assigned to a newly created document.
• Extend list_wikis to report the current default document syntax of every reachable wiki.
• When creating a document:
  • If syntax is supplied, validate it and assign it to the new document.
  • If syntax is omitted, resolve the target wiki's default syntax dynamically at execution time and use it.
• Update the write_document instructions to tell clients to consult list_wikis before generating content when syntax is omitted. Do not hardcode XWiki 2.1 or any other syntax.
• When updating an existing document:
  • Preserve its current syntax when syntax is omitted.
  • Reject the operation when the supplied syntax differs from the document's current syntax.
• Report the effective document syntax in every successful write_document response.
• Update the tool schemas, man pages and tests, including single-wiki and cross-wiki cases.