Controls the MCP structured-content text fallback.
auto currently degrades to always: MCP has no standardized client
capability declaring that structured tool results reach the model. It is a
named migration point for capability negotiation once MCP adds one. A
predicate is consulted only when client identity is known (or for A2A,
where transport alone is meaningful); unknown MCP/direct clients mirror as
a fail-safe.
Controls the MCP structured-content text fallback.
autocurrently degrades toalways: MCP has no standardized client capability declaring that structured tool results reach the model. It is a named migration point for capability negotiation once MCP adds one. A predicate is consulted only when client identity is known (or for A2A, where transport alone is meaningful); unknown MCP/direct clients mirror as a fail-safe.