{"record":{"id":"9f37f16d54efbfeb","repo":"xai-org/grok-build","slug":"failed-to-serialize-request-e","errorCode":null,"errorMessage":"Failed to serialize request: {e}","messagePattern":"Failed to serialize request: (.+?)","errorType":"exception","errorClass":"ToolError","httpStatus":null,"severity":"error","filePath":"crates/codegen/xai-grok-tools/src/implementations/web_search/client.rs","lineNumber":167,"sourceCode":"                msg,\n            )\n        };\n        let web_search = rs::WebSearchToolArgs::default()\n            .filters(rs::WebSearchToolFilters { allowed_domains })\n            .build()\n            .map_err(|e| err(format!(\"Failed to build web search tool: {e}\")))?;\n        let request = rs::CreateResponseArgs::default()\n            .model(self.model.clone())\n            .input(query.to_string())\n            .tools(vec![rs::Tool::WebSearch(web_search)])\n            .store(false)\n            .temperature(0.1)\n            .top_p(0.95)\n            .max_output_tokens(8192u32)\n            .build()\n            .map_err(|e| err(format!(\"Failed to build request: {e}\")))?;\n        let mut body = serde_json::to_value(&request)\n            .map_err(|e| err(format!(\"Failed to serialize request: {e}\")))?;\n        if let Some(excluded) = excluded_domains.filter(|d| !d.is_empty()) {\n            let tool = body\n                .get_mut(\"tools\")\n                .and_then(|t| t.as_array_mut())\n                .and_then(|arr| arr.first_mut())\n                .and_then(|t| t.as_object_mut());\n            if let Some(tool) = tool {\n                let filters = tool\n                    .entry(\"filters\")\n                    .or_insert_with(|| serde_json::json!({}));\n                filters[\"excluded_domains\"] = serde_json::json!(excluded);\n            }\n        }\n        Ok(body)\n    }\n    /// Wire a 401-attribution callback into this client. Idempotent;\n    /// safe to call before or after the first request.\n    pub fn with_attribution_callback(","sourceCodeStart":149,"sourceCodeEnd":185,"githubUrl":"https://github.com/xai-org/grok-build/blob/bc7f02eddd3d84085849dc19ed216f11c23b0571/crates/codegen/xai-grok-tools/src/implementations/web_search/client.rs#L149-L185","documentation":"Once built, the request struct is serialized to a serde_json::Value so excluded_domains can be patched into the tools array before sending. If serde_json::to_value(&request) fails, the client returns \"Failed to serialize request: {e}\". This indicates a serde mismatch between the request type and its Serialize impl (non-string map keys, unserializable field types), not a transport problem.","triggerScenarios":"Calling search/search_with_titles when the request struct (or nested tool/filter types from the rs crate) fails serialization — e.g. a crate version whose types use non-string map keys or contain #[serde(skip)]-incompatible custom types.","commonSituations":"Mixed/incompatible versions of the rs serialization crate after an upgrade; a custom wrapper type inserted into the request without a Serialize impl; exotic field types in a patched CreateResponseArgs.","solutions":["Read the wrapped {e} message; serde names the exact field/path that failed.","Align the rs crate (and serde/serde_json) versions so the request types' Serialize impls match.","Check for custom types added to the request that lack Serialize impls or use non-string map keys.","Reproduce with a minimal CreateResponseArgs + WebSearchTool to see if serialization fails without excluded_domains handling, isolating the offending field."],"exampleFix":"// before — mixed crate versions\nrs = { version = \"0.8\" }  # serde_json = \"1.0.90\" (old)\n// after — aligned versions\nrs = { version = \"0.9\" }\nserde_json = \"1.0.128\"","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n  result = await client.search(query);\n} catch (e) {\n  if (String(e).startsWith('Failed to serialize request')) {\n    throw new Error('serde failed to serialize web search request: ' + e.message +\n      ' — check rs/serde_json version alignment');\n  } else { throw e; }\n}","preventionTips":["Keep serde, serde_json, and the rs crate versions aligned in Cargo.lock.","Add a smoke test that serializes a fully-built search request on every dependency bump.","Avoid inserting custom types into the request that lack Serialize impls or use non-string map keys."],"tags":["web-search","serde","serialization"],"backgroundTag":"serde-serialization-failed","analyzedSha":"bc7f02eddd3d84085849dc19ed216f11c23b0571","analyzedAt":"2026-08-31T04:59:42.031Z","schemaVersion":2},"datasetVersion":"2026-08-31T09:17:48.483Z"}