get_std_lib_item hangs with get_source_file=false for std.heap.WasmAllocator

[DanielTowerz]

Calling the get_std_lib_item tool for std.heap.WasmAllocator with get_source_file=false causes the server to hang indefinitely. When get_source_file=true, it responds correctly.

The suspected cause is an infinite recursion during the "rich doc" generation, possibly from a circular reference between the type (WasmAllocator) and its value (wasm_allocator).

Steps to Reproduce

Command that hangs:

npx @modelcontextprotocol/inspector --cli \
  npx -y zig-mcp @latest --version 0.15.1 --update-policy manual \
  --method tools/call --tool-name get_std_lib_item \
  --tool-arg name=std.heap.WasmAllocator \
  --tool-arg get_source_file=false

Command that works:

npx @modelcontextprotocol/inspector --cli \
  npx -y zig-mcp @latest --version 0.15.1 --update-policy manual \
  --method tools/call --tool-name get_std_lib_item \
  --tool-arg name=std.heap.WasmAllocator \
  --tool-arg get_source_file=true

Environment

• OS: Darwin Kernel Version 24.1.0 arm64
• CPU: Apple M1
• Node: v23.7.0
• npm: 10.9.2
• @modelcontextprotocol/inspector: Not available (--version starts the server).
• Zig std version: 0.15.1

Workaround

Set get_source_file=true.

[Afirium]

Hey @DanielTowerz, thanks for the report! In version 1.3.0 (latest) the bug with alias handling is fixed. Could you confirm the issue is gone so I can close it?

[DanielTowerz]

Yep, thanks!!!
I confirm that the issue is gone!!!