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[bot] Add Critic Agent, new hook events, MCP auth & built-in skills (CLI v1.0.15–v1.0.18)#33

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[bot] Add Critic Agent, new hook events, MCP auth & built-in skills (CLI v1.0.15–v1.0.18)#33
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@github-actions github-actions bot commented Apr 4, 2026

What was found

Updates from Copilot CLI v1.0.15–v1.0.18 (released 2026-04-01 to 2026-04-04):

New features

  • Critic Agent (v1.0.18) — A built-in second-opinion agent that automatically reviews plans and complex implementations using a complementary model. Available in experimental mode for Claude models.
  • notification hook event (v1.0.18) — New hook event that fires asynchronously on shell completion, permission prompts, elicitation dialogs, and agent completion.
  • preToolUse hook permissionDecision 'allow' (v1.0.18) — Setting permissionDecision to 'allow' in a preToolUse hook now suppresses the tool approval prompt.
  • postToolUseFailure hook event (from awesome-copilot docs, v1.0.15 era) — New event that fires when a tool fails; postToolUse now only fires on success.
  • /mcp auth with device code flow (v1.0.15) — /mcp auth (server) command for authenticating with MCP servers, with RFC 8628 device code flow fallback for providers requiring HTTPS (e.g., Slack).
  • mcp.config server RPCs (v1.0.15) — mcp.config.list/add/update/remove for programmatic management of persistent MCP server configurations.
  • Built-in skills (v1.0.17) — The Copilot CLI now ships with built-in skills out of the box.

What was updated

  • ASCII At a Glance diagram — Added Critic Agent to the AGENTIC section
  • Table of Contents — Added Critic Agent entry
  • Skills section — Added note about built-in skills shipped with the CLI
  • MCP Servers section — Added /mcp auth subsection (with device code flow) and mcp.config RPC table
  • Hooks section — Expanded hook types table with preToolUse, postToolUse, postToolUseFailure, and notification events; added config notes for the new behaviors
  • New Critic Agent section — Full feature documentation with enable config, how-it-works steps, and a RecipeShare example
  • Quick Reference table — Added Critic Agent row

Sources

Generated by Check Copilot Updates ·

…0.15–v1.0.18)

New features from copilot-cli v1.0.15–v1.0.18 (2026-04-01 to 2026-04-04):

- Add Critic Agent section: built-in second-opinion reviewer for plans
  and complex implementations (experimental, Claude models)
- Add notification, preToolUse, postToolUse, postToolUseFailure hook
  events to Hooks section; document permissionDecision 'allow' behavior
- Add /mcp auth command with device code flow (RFC 8628) fallback
- Add mcp.config.list/add/update/remove server RPCs to MCP section
- Add built-in skills note to Skills section (shipped in v1.0.17)
- Update ASCII diagram, ToC, and Quick Reference table for Critic Agent

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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