zeroclaw-labs/zeroclaw · error

NativeChatRequest should serialize to JSON

Error message

NativeChatRequest should serialize to JSON

What it means

Error "NativeChatRequest should serialize to JSON" thrown in zeroclaw-labs/zeroclaw.

Source

Thrown at crates/zeroclaw-providers/src/anthropic.rs:2584

                        "tool_choice": tool_choice.as_ref().and_then(|value| value.get("type")).and_then(|value| value.as_str()),
                    })),
                "native thinking enabled; using non-streaming fallback to preserve signed thinking blocks"
            );
            let native_request = NativeChatRequest {
                model: model.to_string(),
                max_tokens: effective_max_tokens,
                system: system_prompt,
                messages,
                temperature: effective_temperature,
                tools: native_tools,
                tool_choice,
                stream: None,
                thinking: thinking_config,
            };
            // Serialize eagerly so the request body is owned and `'static`
            // across the async boundary.
            let body = serde_json::to_value(&native_request)
                .expect("NativeChatRequest should serialize to JSON");
            let client = self.http_client();
            let url = format!("{}/v1/messages", self.base_url);
            let is_oauth = Self::is_setup_token(&credential);

            return stream::once(async move {
                let mut req = client
                    .post(&url)
                    .header("anthropic-version", "2023-06-01")
                    .header("content-type", "application/json")
                    .json(&body);
                if is_oauth {
                    req = req
                        .header("Authorization", format!("Bearer {credential}"))
                        .header(
                            "anthropic-beta",
                            "claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14",
                        )
                        .header("anthropic-dangerous-direct-browser-access", "true");

View on GitHub (pinned to 88bb9c8533)

Solutions

1. This invariant failure indicates a serialization bug; report it with the request payload that triggered it.
2. Validate the request fields against the Anthropic schema to find the value that breaks serialization.

When it happens

Trigger: Thrown at crates/zeroclaw-providers/src/anthropic.rs:2584 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zeroclaw-labs/zeroclaw@88bb9c8533 (2026-08-23). Data as JSON: /api/errors/b7fc4b18d9dc84bd. Report an issue: GitHub.