docs: clarify capability visibility and authorization - #4642
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This pull request updates the context and tool guidance to show how one request-scoped application policy can drive function-tool, handoff, and MCP visibility callbacks.
It also clarifies that
is_enabledcontrols capability visibility and dispatch, while authorization based on tool arguments or protected resources remains the responsibility of tool implementations and MCP servers. Tool input guardrails and approvals are identified as additional invocation-time controls.This pull request resolves #4618.