agents@0.16.2

Patch Changes

• #1767 f03dee6 Thanks @threepointone! - Reduce Think Durable Object SQLite reads during normal wakes and text-only turns.

  Think now avoids automatic media-eviction scans until hydration has been windowed or an oversized appended message has been observed. The shared resumable stream buffer also avoids per-wake metadata-column introspection by creating new tables with the current columns and lazily migrating legacy tables only when a stream write needs it.

• #1722 9f8e14b Thanks @mattzcarey! - Fix two MCP client OAuth bugs found by the new conformance suite, and add MCP conformance testing.

  • MCPClientConnection now finishes OAuth on the transport that received the 401. A fresh transport loses the resource metadata URL from the WWW-Authenticate header, so token exchange fell back to the default /token path and failed against authorization servers at non-default locations.
  • MCPClientConnection.init() detaches the previous transport before reconnecting. Re-authorizing after a mid-session 401 (scope step-up, token revocation) previously failed permanently with "Already connected to a transport".
  • Added the official @modelcontextprotocol/conformance suite (as used by the MCP TypeScript SDK) running against the MCP client (Agent + MCPClientManager), McpAgent, and createMcpHandler + WorkerTransport — all hosted in workerd via wrangler dev. See packages/agents/conformance/README.md.

• #1767 f03dee6 Thanks @threepointone! - Cache the active branch tip in AgentSessionProvider so finding the latest leaf no longer scans the whole session on every read and append.

  latestLeafRow() previously ran an anti-join over every message row (O(rows)) to locate the branch tip — on each hydration AND each auto-parent append, so on long transcripts it dominated a wake's read cost. The tip is now maintained in place on append/delete/clear; a cached tip is re-validated on read with an O(1) existence + still-childless check (so it self-heals if another writer deletes the tip or gives it a child), and the full scan only runs when that check fails or the cache is cold. Per-hydration and per-append tip lookups drop from O(rows) to O(1), and the full scan never runs more often than before.