Félix Malfait
f96e36d3e6
## Problem Fixes #21695. An AI chat thread became **permanently unusable** — every subsequent message failed with `AI_APICallError: Internal server error` from Anthropic — when the thread history contained a tool part in `output-error` state with a **null input** (e.g. a tool call that failed input validation before execution, so neither `toolInput` nor `toolOutput` was ever captured). ## Validation of the reported findings I reproduced and confirmed the root cause empirically against the pinned `ai@6.0.97` SDK before writing the fix. **Root cause (confirmed from SDK source).** `convertToModelMessages` serializes every non-`input-streaming` tool part into a provider `tool_use` block, and for errored parts it uses: ```ts input: part.state === 'output-error' ? (part.input ?? ('rawInput' in part ? part.rawInput : undefined)) : part.input, ``` When both `input` and `rawInput` are nullish, the block is built with `input: undefined`, which `JSON.stringify` drops — so the HTTP payload carries a `tool_use` with **no `input` field**. This matches the reporter's minimal repro exactly (no `input` → `400 Field required`; `input: {}` → `200`). Inside a large streamed conversation the same malformed block surfaces as the generic `500`, and because the bad part is replayed on every turn the thread stays bricked. **Why #21276 didn't catch it.** `finalizeDanglingToolParts` only rewrote `input-available` parts; a part that arrives already in `output-error` with a null input was passed through untouched. **Note on current `main`.** A read-path default added recently (`mapDBPartToUIMessagePart`: `input: part.toolInput ?? {}`) already masks the live 500 on the standard reload path. However the gap is real and worth closing: the persist path still writes `toolInput = NULL` (the exact malformed rows the reporter found in `core."agentMessagePart"`), `finalizeDanglingToolParts` still doesn't normalize this case, and the protection rested on a single implicit default with no regression coverage. A small repro harness confirmed all of this: persisted `toolInput` was `undefined`, and a raw (non-defaulted) `output-error` part produced a `tool-call` whose `input` value was `undefined`. ## Fix Defense-in-depth so the invariant *"a tool part always carries a defined input"* holds at both the finalize and storage boundaries: - **`finalizeDanglingToolParts`** now backfills `input: {}` for `output-error` parts whose input is null, while preserving the original error message. This is the natural chokepoint (it already runs immediately before every persist). - **`mapUIMessagePartsToDBParts`** defaults a nullish tool input to `{}` so malformed rows are never persisted, independent of the caller. The existing read-path `?? {}` default is kept as a third safety net. ## Tests - Unit tests for `finalizeDanglingToolParts`: backfills `{}` for an `output-error` part missing its input, and preserves the existing validation error message. - Persistence test: `mapUIMessagePartsToDBParts` stores `{}` (never `null`) for a missing input. - End-to-end round-trip test: after finalize → persist → reload, `convertToModelMessages` produces a `tool-call` with a defined input and the errored call stays resolved. All three new core assertions were verified to **fail without the fix** and pass with it. Full AI module suite (97 tests) passes; `oxlint --type-aware`, `oxfmt`, and `tsgo` typecheck are clean. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01SpuX6Pp2yTevk1zKTRiB9G --- _Generated by [Claude Code](https://claude.ai/code/session_01SpuX6Pp2yTevk1zKTRiB9G)_ <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/twentyhq/twenty/pull/21752?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. --> --------- Co-authored-by: Claude <noreply@anthropic.com>
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