libtmux_mcp.resources.hierarchy.register_completions
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Answer argument completion for the
tmux://templates.Description#
The templates take live tmux identifiers, which a reader cannot guess and the template listing does not carry — MCP publishes only the URI template itself, never its parameter domain. A completion handler is the protocol's way to offer them.
Agent clients do not send
completion/complete; human-facing hosts (the MCP Inspector's UI, VS Code) do, which is who this serves.