Copilot SDK Rust v1.0.0-beta.9: Error Handling & Tool Hooks
Rust SDK v1.0.0-beta.9 brings error struct refactoring, post-tool-use failure hooks, and per-message agent mode control. Breaking change in error handling requires migration.
TL;DR
- Rust SDK errors refactored to use structs with
kind()method for better error handling - Post-tool-use failure hooks added for improved agent control
- Multitenancy hardening in Client Mode and per-message agent mode fixes
New
- Post-tool-use failure hooks — Execute custom logic after tool execution fails, giving agents better error recovery paths
- MessageOptions.agentMode — Set agent mode per-message instead of globally, fixing mode misuse bugs
- Extract-to-cache build mode — New Copilot CLI build mode for optimized artifact caching
- Rust error struct refactor — Errors now use structs with
kind()method instead of enums, improving type safety and extensibility
Fixed
- JSON-RPC error data preservation in .NET SDK — Error context now survives serialization
- Multitenancy hardening in Client Mode — Improved isolation and security for multi-tenant deployments
- Repackaging issues — Resolved distribution and artifact handling
Breaking Changes
- Rust SDK error handling — Code using the old enum-based error API must migrate to the new struct-based
kind()pattern. Check the release notes for migration details
Update: cargo update github-copilot or check your Cargo.toml for the latest Copilot SDK version.
Source: Copilot SDK
