fix(component): extend message pages to the order boundary by robelest · Pull Request #321 · convex/agent

robelest · 2026-08-21T22:45:02Z

Fixes #193.

Completes the oldest order inside listMessagesByThreadId so the continue cursor never splits a UI message. Same mechanism search.ts already used for context assembly; search.ts drops its copy. completeOrders: false opts out.

https://claude.ai/code/session_01YGMZR56ff1JhEEoMnuwa9e

pkg-pr-new · 2026-08-21T22:45:40Z

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📒 Files selected for processing (7)

src/component/messages.test.ts
src/component/messages.ts
src/vercel/client/definePlaygroundAPI.ts
src/vercel/client/search.test.ts
src/vercel/client/search.ts
src/vercel/react/useThreadMessages.ts
src/vercel/react/useUIMessages.ts

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src/vercel/react/useThreadMessages.ts
src/vercel/react/useUIMessages.ts

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📝 Walkthrough

Walkthrough

listMessagesByThreadId now completes descending pages at the oldest message order by default. The new completeOrders option disables this behavior when callers need exact page sizes. Explicit pagination and read limits prevent order completion. Thread cloning and playground latest-message reads opt out. Recent-message search now uses only the initial page. React hook documentation describes initialNumItems as a minimum page size. Tests cover order boundaries, filtering, cursors, limits, and search behavior.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant listMessagesByThreadIdHandler
  participant PaginationQuery
  Caller->>listMessagesByThreadIdHandler: Request descending message page
  listMessagesByThreadIdHandler->>PaginationQuery: Read requested page
  listMessagesByThreadIdHandler->>PaginationQuery: Re-read oldest-order prefix when eligible
  listMessagesByThreadIdHandler-->>Caller: Return completed page and updated cursor

Priority: ➖ Normal

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 2eab6

No actionable risk introduced by these pagination changes remains; the change is ready to merge.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	Most changes support issue `#193`. The query-layer completion, caller flags, search adjustment, hook documentation, and tests all relate to order-boundary pagination. However, the two `deleteByIds` call…	Remove the unrelated formatting-only changes in the issue `#300` tests, or provide a concrete dependency between those formatting changes and issue `#193`.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue `#193` requires streaming to finish when message counts reach `initialNumItems`, and it applies to both message hooks. The shared `usePaginatedMessages` wrapper now tracks split orders and loads f…
Title check	✅ Passed	The title clearly and concisely describes the main change: extending component message pages to complete order boundaries.
Description check	✅ Passed	The description accurately explains the order-boundary completion, the related search change, and the completeOrders opt-out.

Full details: Out of Scope Changes check

Explanation

Most changes support issue #193. The query-layer completion, caller flags, search adjustment, hook documentation, and tests all relate to order-boundary pagination. However, the two deleteByIds call reformatting changes in the issue #300 tests have no demonstrated connection to message pagination or streaming completion.

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ianmacartney · 2026-08-21T23:48:59Z

What would the risks be if we did this as part of useThreadMessages? That it would load way too many messages? If we could carry through the cursor correctly, it might be nice to have a paginated interface that automatically advances to order boundaries. Assuming here that a single order won't push us over transaction limits?

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Inline comments:
In `@src/vercel/react/useUIMessages.ts`:
- Around line 195-198: Update the queryKey construction near getFunctionName to
serialize query arguments with convexToJson before JSON.stringify instead of
JSON.stringify(args) directly, while preserving the "skip" branch. Add
regression coverage for bigint and another encoded Convex value such as
ArrayBuffer, verifying distinct supported query identities produce valid keys.

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src/vercel/react/useThreadMessages.ts
src/vercel/react/useUIMessages.test.ts
src/vercel/react/useUIMessages.ts

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Claude-Session: https://claude.ai/code/session_01YGMZR56ff1JhEEoMnuwa9e

Fixes convex#193. Complete the oldest order inside listMessagesByThreadId so the continue cursor never splits a UI message. search.ts drops its own completion fetch since the query now does it. completeOrders: false opts out for callers that only want the newest rows. Supersedes the client-side loop in convex#321. Claude-Session: https://claude.ai/code/session_01YGMZR56ff1JhEEoMnuwa9e

robelest · 2026-09-18T17:16:08Z

Yeah, moved it into the query. search.ts was already doing this for context assembly (complete the oldest order, sized to stepOrder, capped at 1000), so listMessagesByThreadId does it now and search drops its copy. Cursor lands on the order boundary, endCursor replay returns the same range, and it backs off if the caller passed their own row/byte limits. completeOrders: false opts out (playground, clone).

ianmacartney

thanks for the due diligence here! some notes. and if you can think of a better term than "completeOrders" that might be nice, but I can't think of one offhand

ianmacartney · 2026-10-05T19:08:32Z

+    paginationOpts.maximumRowsRead === undefined &&
+    paginationOpts.maximumBytesRead === undefined &&


ideally they could pass these and they would only come into play if the limits were actually hit: usually these are really conservative values to avoid running out of memory.. if they are hit, we could still return a complete order by returning fewer items, but then we'd need to return a matching endCursor, which you're already handling a version of below

ianmacartney · 2026-10-05T19:13:28Z

+  // subsequent pages instead.
+  const oldest = messages.page[messages.page.length - 1];
+  if (
+    order === "desc" &&


It also seems reasonable to request a complete order in ascending order, so let's at least fail a request that passes "asc" order and completeOrders: true

ianmacartney · 2026-10-05T19:15:47Z

  args: ThreadMessagesArgs<Query> | "skip",
  options: {
+    /**
+     * Minimum page size. A page is extended to the end of its oldest `order`


technically not minimum, since if the endCursor is set then messages are deleted, it can shrink (or if there aren't enough items to fill the page). but worth mentioning that the initial value can be higher

ianmacartney · 2026-10-05T19:15:52Z

  args: UIMessagesQueryArgs<Query> | "skip",
  options: {
+    /**
+     * Minimum page size. A page is extended to the end of its oldest `order`


robelest · 2026-10-06T17:19:43Z

@ianmacartney Thanks for the review. On further testing we found edge cases this approach still misses, so I replaced it with #395, which fixes it in the React hooks instead. Closing this one.

robelest force-pushed the robel/issue-193 branch 2 times, most recently from d68b71f to 0112c89 Compare August 21, 2026 23:24

robelest marked this pull request as ready for review August 21, 2026 23:34

robelest force-pushed the robel/issue-193 branch from 0112c89 to 8ca34d9 Compare August 23, 2026 21:17

coderabbitai Bot reviewed Aug 23, 2026

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Comment thread src/vercel/react/useUIMessages.ts Outdated

robelest force-pushed the robel/issue-193 branch from 8ca34d9 to 31c76b7 Compare August 25, 2026 20:47

robelest added 2 commits September 18, 2026 10:08

test: paginated message pages end on order boundaries

18b98d6

Claude-Session: https://claude.ai/code/session_01YGMZR56ff1JhEEoMnuwa9e

robelest force-pushed the robel/issue-193 branch from 31c76b7 to 2eab6e8 Compare September 18, 2026 17:15

robelest changed the title ~~fix(react): complete UI messages across pages~~ fix(component): extend message pages to the order boundary Sep 18, 2026

robelest requested a review from ianmacartney September 18, 2026 18:37

ianmacartney approved these changes Oct 5, 2026

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robelest mentioned this pull request Oct 6, 2026

fix(react): assemble messages by order across pages and streams #395

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robelest closed this Oct 6, 2026

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fix(component): extend message pages to the order boundary - #321

fix(component): extend message pages to the order boundary#321
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