Expose custom client capabilities - #55
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jakekaplan
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July 29, 2026 21:18
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jakekaplan
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July 29, 2026 21:41
jakekaplan
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Jul 29, 2026
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I don't totally understand this so let me know if I should take it out
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This is just how we're doing auto changelogs and releases so this is perfect!
znicholasbrown
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Jul 29, 2026
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Adds typed
capabilitiesoptions toClientandMultiServerClient, merging caller declarations with capabilities FastMCP-TS already infers instead of replacing them. For example, Horizon’s browser Inspector can advertise MCP Apps support:The extension travels through legacy
initializeand modern 2026 per-request metadata. Sampling and roots are deprecated in modern MCP, but preserving their existing advertisement keepsauto-negotiated legacy 2025 connections working; this PR does not introduce new reliance on them or add extension-specific behavior.