Expose cached MCP tools before server startup - #35590
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## Why Cached MCP definitions can be supplied to inference without waiting for the server to finish initializing. ## What changed - Publish cached tools while startup is still in progress, clearing their potentially stale read-only hint. - Wait for the selected server to start before executing a tool call, then prepare the call against the refreshed live binding. - Keep cached tools visible in a binding even when no live client is available, while rejecting attempts to prepare those calls. ## Testing - Cover cached-tool visibility before startup and replacement with live tool metadata afterward. - Verify cached definitions reach inference before MCP initialization and that calls unavailable in the live catalog return the expected model-visible error. GitOrigin-RevId: 3aae8f474c344ccdc5e08fe321bbad21d85bffd1
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Expose cached MCP tools before server startup
Why
Cached MCP definitions can be supplied to inference without waiting for the
server to finish initializing.
What changed
potentially stale read-only hint.
prepare the call against the refreshed live binding.
while rejecting attempts to prepare those calls.
Testing
metadata afterward.
calls unavailable in the live catalog return the expected model-visible
error.