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docs/api/mods-reference.md lists every capability, world, interface, type, function and hook of horizon:mods, generated from crates/horizon-mod-sdk/wit/horizon.wit and the manifest's capabilities by a test in horizon-mods (feature pack, as CI runs it). The test fails when the page is out of date (HORIZON_WRITE_DOCS=1 rewrites it), when a function has no doc comment, or when a capability grants an interface the contract lacks. The WIT's undocumented functions and fields get doc comments (no change to the contract itself). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>