claude-opus-4-7 fails with 'temperature is deprecated for this model'

[LegendAlessandro-Liguori]

Summary

Calls to claude-opus-4-7 (configured via provider: anthropic) consistently fail with HTTP 400:

{"error":{"code":"invalid_request_error","message":"temperature is deprecated for this model.","type":"invalid_request_error"}}

The claude-opus-4-7 family no longer accepts the temperature parameter — sending it (even at the picoclaw default 0.7) returns a 400 before the model is invoked. There is no per-model config knob to suppress the field today, so every request to this model fails.

Reproduce

1. Add a model entry:

   {
     "model_name": "claude-opus-4.7",
     "provider": "anthropic",
     "model": "claude-opus-4-7",
     "api_base": "https://api.anthropic.com/v1"
   }

2. Set a valid sk-ant-… Anthropic API key for that entry (no auth_method).
3. Send any chat message → 400 from Anthropic with the message above.

Where temperature is injected

• pkg/agent/instance.go:178 — defaults temperature to 0.7 when agents.defaults.temperature is unset.
• pkg/providers/openai_compat/provider.go:178-184 — always writes requestBody["temperature"] for the chat-completions path that the anthropic protocol routes through.
• pkg/providers/anthropic_messages/provider.go:176-179 — same unconditional write for the native Messages API.

A workaround exists (set thinking_level: "off" on the model entry — only works in some cases) but the root cause is the unconditional temperature send.

Suggested fix

Skip the field for models that deprecate it, mirroring the existing kimi-k2 special case in openai_compat. PR follows.

Environment

• picoclaw v0.2.7 (git_commit 71c877a, built 2026-04-22)
• Docker image sipeed/picoclaw:launcher
• Anthropic API