Bug

When using openai-codex/gpt-5.2-codex as a sub-agent model, the first tool call succeeds but submitting the tool result back fails with:

404 Item with id 'rs_xxx' not found. Items are not persisted when `store` is set to false. Try again with `store` set to true, or remove this item from your input.

Root Cause

OpenClaw uses the OpenAI Responses API for Codex models (openai-codex-responses api type). The Responses API defaults store to false when not explicitly set. This means the response object (with id rs_xxx) is not persisted server-side. When OpenClaw then submits tool results referencing that response id via previous_response_id, OpenAI returns 404 because the response was never stored.

Expected Behavior

OpenClaw should set store: true in the Responses API request body when using Codex models (or any model using the Responses API in agentic/tool-use mode).

Reproduction

1. Configure a Codex model: openai-codex/gpt-5.2-codex
2. Spawn a sub-agent with tools enabled
3. Agent makes a tool call → tool executes successfully
4. Submitting tool result back fails with the 404 error

Version

openclaw 2026.2.12

Workaround

Use Anthropic models (e.g., claude-opus-4-6) instead of Codex for sub-agents that need tools.