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Copilot CLI v1.0.52-0: Deferred Tool Loading & MCP Fixes

Copilot CLI 1.0.52-0 adds deferred tool loading for custom agents, upgrades subagent models to GPT-5.4/5.5, and fixes MCP OAuth re-authentication and PowerShell false positives.

Copilot CLI v1.0.52-0: Deferred Tool Loading & MCP Fixes

TL;DR

  • Custom agents now support deferred tool loading for faster discovery with large tool lists
  • /compact accepts focus instructions; general-purpose subagents upgraded to GPT-5.4/5.5
  • MCP OAuth re-authentication, legacy config migration, and PowerShell false-positive fixes

New

  • Deferred tool loading — Custom agents can opt-in via deferred-tool-loading in agent frontmatter to enable tool-search discovery without loading all tools upfront

Improved

  • /compact focus instructions — Now accepts optional parameters to shape compaction summaries
  • Subagent model upgrades — General-purpose subagents use GPT-5.4 or GPT-5.5 when available
  • /usage quota display — Shows progress bars for session and weekly credit limits
  • AI credits errors — Clearer error messages with direct Manage budget link

Fixed

  • Exit summary now displays AI Credits label with correct spacing
  • /restart and /update preserve session ID after restarting
  • Legacy nested oauth.clientId and oauth.callbackPort keys in MCP server configs are migrated to oauthClientId and auth.redirectPort instead of being dropped
  • MCP OAuth re-authentication respects configured redirectPort
  • PowerShell division operator no longer triggers false 'Allow directory access' prompts on Windows

Update via: gh copilot update

Source: Copilot CLI

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