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This skill should be used when building applications with the Claude Agent SDK (Python).
Passed 19 of 20 test cases with the skill, and 5 of 20 without it.
and 18 more in the full report
16 fixed5 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
What exact Anthropic beta header string is required when enabling structured JSON outputs validation in version 0.1.45+ of the agent SDK?
| Checked | Without skill | With skill |
|---|---|---|
| Includes structured-outputs-2025-11-13 | Missed | Passed |
The instructions your model reads when the skill loads.
Package: @anthropic-ai/[email protected] (Nov 21, 2025) Breaking Changes: v0.1.45 - Structured outputs (Nov 2025), v0.1.0 - No default system prompt, settingSources required
Major Features:
outputFormat parameter - Define output structure with JSON schema or Zodmessage.structured_outputstructured-outputs-2025-11-13Example:
import { query } from "@anthropic-ai/claude-agent-sdk";
import { z } from "zod";
const schema = z.object({
summary: z.string(),
sentiment: z.enum(['positive', 'neutral', 'negative']),
confidence: z.number().min(0).max(1)
});
const response = query({
prompt: "Analyze this code review feedback",
options: {
model: "claude-sonnet-4-5",
outputFormat: {
type: "json_schema",
json_schema: {
name: "AnalysisResult",
strict: true,
schema: zodToJsonSchema(schema)
}
test cases passed, vs 5 / 20 without
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