Eric Allam
9f64bf404b
## Summary Updates the AI chat docs to match the slim-wire + field-level merge behavior shipped in #3719 and the precise `.in/append` cap + CORS-readable 413 shipped in #3720. No behavior changes here — code is correct in `main`; the docs were lagging on three patterns customers copy out of the page. ## What changed - **`hydrateMessages` examples upsert by id** (in `lifecycle-hooks.mdx`, `patterns/database-persistence.mdx`, and `patterns/persistence-and-replay.mdx`). The previous `stored.push(newMsg)` pattern duplicated the assistant id on HITL continuations and caused the LLM to receive a tool call with no `arguments`. The new examples include the rationale inline. - **`onValidateMessages` example filters to user messages** (`lifecycle-hooks.mdx`). The previous example called `validateUIMessages({ messages, tools })` directly, which now throws on HITL slim wires (the AI SDK schema requires `input` on resolved tool parts). New example shows the filter pattern, with a Warning callout explaining why. - **Merge contract description updated** (`lifecycle-hooks.mdx`). The old wording said incoming messages are "auto-merged" / "replaced"; the new description explains the actual field-level overlay (state advances only). - **Approval-responded wire example slimmed** (`client-protocol.mdx`). Shows the minimum shape the agent reads — `state` + `approval` (or `output` / `errorText` for HITL). Notes that the built-in transports ship this slim shape by default and that fuller shapes are still accepted. - **`/in/append` 413 row and FAQ updated** (`client-protocol.mdx`, `patterns/trusted-edge-signals.mdx`). Reflects the new precise S2 cap and the CORS-readable 413. - **New changelog entry** at the top of `changelog.mdx` covering all of the above. The historical `## 512 KiB ceiling removed` entry further down the changelog is left as-is (it's a snapshot of the prior transition), and the v4.5 upgrade-guide section is skipped — the merge contract is backwards compatible. ## Test plan - Mintlify dev preview renders cleanly with no broken anchors - Linked references resolve (`/ai-chat/lifecycle-hooks#hydratemessages`, `/ai-chat/lifecycle-hooks#onvalidatemessages`, `/ai-chat/patterns/database-persistence#alternative-hydratemessages`, `/ai-chat/client-protocol#step-3-send-messages-stops-and-actions`, `/ai-chat/patterns/large-payloads`)
Development
Install and initial setup
pnpm install
Running the app
pnpm run dev --filter docs
View the app locally
It runs locally here:
http://localhost:3050