Bug

Every call to github-copilot/claude-haiku-4.5 fails with a 400 schema rejection, causing an immediate fallback to the next model in the chain. This is 100% reproducible — not intermittent.

Error

LLM request failed: provider rejected the request schema or tool payload.
rawError=400 tools.0.custom.eager_input_streaming: Extra inputs are not permitted

Log evidence

[agent/embedded] embedded run failover decision: stage=assistant decision=fallback_model reason=format from=github-copilot/claude-haiku-4.5 rawError=400 tools.0.custom.eager_input_streaming: Extra inputs are not permitted
[model-fallback/decision] decision=candidate_failed requested=github-copilot/claude-haiku-4.5 reason=format next=anthropic/claude-sonnet-4-6

Observed 33 failures today alone across all heartbeat runs (main, subconscious). The eager_input_streaming field appears to be included in the tool definition sent to the Copilot endpoint, which rejects it as an extra/unknown field.

Impact

All heartbeats configured with github-copilot/claude-haiku-4.5 silently fall back to anthropic/claude-sonnet-4-6 (paid) on every single run. This has been causing unexpected Anthropic billing.

Environment

• OpenClaw: 2026.4.22
• Provider: github-copilot (plugin)
• Model: claude-haiku-4.5
• OS: Linux 6.8.0-110-generic x64
• Node: v22.22.1