GitHub Issue Record: INVALID_REQUEST on Single-Agent Task Mode

Date: 2026-04-06
Source: In-app error report from desktop app (Task chat mode -> Single Agent)
Scope: Task conversation in 单机智能体 mode

Title

INVALID_REQUEST: invalid chat.send params: at root: unexpected property 'metadata'

Reproduction Steps

Open XWorkmate app.
Click 新对话.
In task mode selector, choose 任务对话模式 -> 单机智能体.
Send any message.
Observe error in conversation pane:
- INVALID_REQUEST: invalid chat.send params: at root: unexpected property 'metadata'

Actual Result

The conversation fails immediately and returns request validation error because chat.send request payload contains an unexpected root-level metadata field.

Expected Result

Single-agent task chat should send a provider-compatible payload and complete message dispatch without schema validation errors.

Impact

Users cannot reliably start new single-agent task conversations.
Reproducible in normal workflow, blocks core single-agent usage path.

Notes for Follow-up

Inspect request assembly path for single-agent chat.send payload.
Confirm whether metadata must be nested, filtered, or omitted for the current provider endpoint.
Add regression tests for provider schema compatibility in single-agent mode.

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