Chat SDK adds message subjects and direct SDK access
Vercel's Chat SDK now lets bot builders call GitHub, Linear, and Slack APIs directly—no more adapter limits.
Why it matters
Developer infrastructure for AI agents just got more flexible. Direct SDK access means bot builders can now extend functionality beyond chat, reducing friction in agent-as-a-product development.
The key facts
9 to knowMessage subjects now resolve parent issues/PRs from Linear and GitHub with title, status, URL
Platform SDKs (GitHub, Linear, Slack) now directly exposed on adapters
message.subject is API-cached to prevent repeated calls
Previous .client getter deprecated in favor of direct SDK access
Published May 20, 2026
Chat SDK adds message.subject property to resolve parent issues/PRs in Linear and GitHub
message.subject caches per message to reduce API calls
GitHub, Linear, and Slack adapters now expose underlying platform SDKs for direct API access
.client deprecated in favor of native SDK access
Go to the source
Vercel Blogvercel.com
Publisher excerpt: You can now read the parent issue or pull request when your bot is mentioned in a Linear or GitHub comment. resolves to that parent with title, status, URL, and the full typed payload.message.subject is cached per message, so repeated access only hits the API once. It resolves to on Slack and other…