Copilot Chat v0.33.2025102103: Custom Agents & Fixes

TL;DR

• Custom Agents support in Copilot Cloud Agent
• Fixed duplicate content when creating files via edits
• Chat references now passed as attachments to SDK
• Problems support added to CLI

New

• Custom Agents — Copilot Cloud Agent now supports custom agents for extended functionality.
• Problems in CLI — CLI can now handle Problems, expanding diagnostic capabilities.
• Folder paths in get_errors tool — Tool now accepts folder paths for broader error detection.
• Multi-layer automode cache — Improved caching strategy for better performance.

Fixed

• Duplicate content on file creation — Edits no longer insert duplicate content when creating new files.
• Pending session state — Fixed session state handling for untitled documents.
• Endpoint metadata stringification — Corrected missing case for endpoint metadata serialization.
• Event firing in CCA — Fixed incorrect event dispatch in Copilot Cloud Agent.

Changed

• Chat references as attachments — References now passed as attachments to @github/copilot SDK for better integration.
• Completions core version — Updated to latest completions core.
• Copilot API version — Bumped to 0.1.12.
• Removed outdated code — Cleaned up inline completions code and old gpt-5-codex prompt.

Update via VS Code extensions or npm install @github/copilot-chat.

Source: Copilot Chat