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Add MCP tool permissions when creating subagent sessions via Task tool. Previously, MCP tools were visible in the subagent tool registry but permission checks failed because they weren't granted in the session permission array. This fix retrieves available MCP tools and adds them to the permission array with allow action, enabling subagents to execute MCP tools.
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This was referenced Mar 8, 2026
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Fixes #16491. Subagents spawned via Task tool can now execute MCP tools. Previously, MCP tools appeared in the subagent tool registry but permission checks failed because they were not granted in the session permission array. This fix retrieves available MCP tools and adds them to the permission array with allow action, and also includes them in the tools object passed to SessionPrompt.prompt().