mcp 2.0.0 removed mcp.server.fastmcp; MCPServer is the same object under a
new name, so @mcp.tool() and mcp.run() are untouched and every tool keeps its
name, signature and returned shape. Verified against a clean 2.0.0 venv: all
four tools list, and the suite passes at 100% coverage, 609 tests.
Two things the port buys, neither of which existed in 1.x:
* Tool annotations, which matter more here than in the sibling repos because
this server has a tool that writes. The three readers are marked read-only,
idempotent and closed-world; log_meal is marked not-read-only but
explicitly NOT destructive -- it appends and never rewrites or deletes --
not idempotent, since a second confirmed call logs a second meal, and
open-world, because it reaches Open Food Facts when macros are not given.
A client can now tell the difference without reading the docstring.
* Structured output: 2.x derives an output schema from the return types and
sends structured content alongside the text. No code change -- it falls out
of the type hints that were already there.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BsXnTHyuuCUZsqetTaajcF
Krzysztof Rudnicki
58e6731705