--- title: "Structured outputs" canonical: "https://canmyagentuse.com/features/structured-output" contentKind: "feature" locale: "en" description: "Return JSON or schema-constrained output through a documented product feature." llmSummary: "Structured outputs are documented JSON or schema-constrained product outputs; unreviewed harness cells remain unknown." publishedAt: "2026-08-28T00:00:00.000Z" updatedAt: "2026-08-28T00:00:00.000Z" verifiedAt: "2026-08-28" tags: ["interfaces"] --- # Structured outputs Structured outputs are documented JSON or schema-constrained product outputs; unreviewed harness cells remain unknown. - HTML: https://canmyagentuse.com/features/structured-output - JSON: https://canmyagentuse.com/api/v1/features/structured-output.json - Markdown: https://canmyagentuse.com/features/structured-output.md Terminology basis: **Common product term** — https://developers.openai.com/api/docs/guides/structured-outputs. ## Current support at a glance Structured outputs: 4 supported, 0 partial, 0 unsupported, 27 unreviewed across 31 cataloged products. - Reviewed current products: 4 of 31 - Supported: 4 - Partial: 0 - Unsupported: 0 - Unreviewed: 27 - Not applicable: 0 Unknown or unreviewed means insufficient published evidence; it does not mean unsupported. Return JSON or schema-constrained output through a documented product feature. The matrix below lists published **web**, **desktop**, and **CLI** surfaces. Unreviewed cells remain **unknown** until a dated note and public source support a more specific status. Use the Markdown and JSON twins if you are an agent reading this site. ## Catalog context - Category: [interfaces](/categories/interfaces.md) - Terminology basis: Common product term - Aliases: None ## Compatibility assertions Unknown means insufficient published evidence; it does not mean unsupported. ### ChatGPT (web) - Harness: [ChatGPT](/harnesses/chatgpt-web.md) - current: **Unknown** - preview: **Unknown** ### Claude (web) - Harness: [Claude](/harnesses/claude-web.md) - current: **Unknown** - preview: **Unknown** ### Gemini (web) - Harness: [Gemini](/harnesses/gemini-web.md) - current: **Unknown** - preview: **Unknown** ### Copilot (web) - Harness: [Copilot](/harnesses/copilot-web.md) - current: **Unknown** - preview: **Unknown** ### Grok (web) - Harness: [Grok](/harnesses/grok-web.md) - current: **Unknown** - preview: **Unknown** ### Grok Bot (desktop) - Harness: [Grok Bot](/harnesses/grok-bot-desktop.md) - current: **Unknown** ### Perplexity (web) - Harness: [Perplexity](/harnesses/perplexity-web.md) - current: **Unknown** - preview: **Unknown** ### Le Chat (web) - Harness: [Le Chat](/harnesses/le-chat.md) - current: **Unknown** - preview: **Unknown** ### Devin (web) - Harness: [Devin](/harnesses/devin-web.md) - current: **Unknown** - preview: **Unknown** ### Replit Agent (web) - Harness: [Replit Agent](/harnesses/replit-agent.md) - current: **Unknown** - preview: **Unknown** ### ChatGPT (desktop) - Harness: [ChatGPT](/harnesses/chatgpt-desktop.md) - current: **Unknown** - preview: **Unknown** ### Claude (desktop) - Harness: [Claude](/harnesses/claude-desktop.md) - current: **Unknown** - preview: **Unknown** ### Cursor (desktop) - Harness: [Cursor](/harnesses/cursor.md) - current: **Supported** - Target: dated-documentation — current Cursor Agent CLI output-format documentation; observed 2026-08-28 - Environment: local-default - Constraint (runtime): JSON and stream-json formats apply to Agent CLI print mode; this evidence does not establish caller-supplied JSON Schema conformance - Evidence: [Cursor — Agent CLI output format](https://docs.cursor.com/en/cli/reference/output-format) — documented; observed 2026-08-28 - Qualification note 4: Evidence checked 2026-08-28: Cursor Agent CLI documents `json` and `stream-json` output formats for programmatic use in print mode. - preview: **Unknown** ### OpenWork Desktop (desktop) - Harness: [OpenWork Desktop](/harnesses/openwork-desktop.md) - current: **Unknown** ### Copilot Chat (desktop) - Harness: [Copilot Chat](/harnesses/vscode-copilot.md) - current: **Unknown** - preview: **Unknown** ### Chrome WebMCP origin trial (desktop) - Harness: [Chrome WebMCP origin trial](/harnesses/chrome-webmcp-preview.md) - current: **Unknown** ### Windsurf (desktop) - Harness: [Windsurf](/harnesses/windsurf.md) - current: **Unknown** - preview: **Unknown** ### Zed Agent (desktop) - Harness: [Zed Agent](/harnesses/zed-agent.md) - current: **Unknown** - preview: **Unknown** ### Continue (desktop) - Harness: [Continue](/harnesses/continue.md) - current: **Unknown** - preview: **Unknown** ### Cline (desktop) - Harness: [Cline](/harnesses/cline.md) - current: **Unknown** - preview: **Unknown** ### JetBrains AI (desktop) - Harness: [JetBrains AI](/harnesses/jetbrains-ai.md) - current: **Unknown** - preview: **Unknown** ### Warp (desktop) - Harness: [Warp](/harnesses/warp.md) - current: **Unknown** - preview: **Unknown** ### Claude CLI (cli) - Harness: [Claude CLI](/harnesses/claude-cli.md) - current: **Supported** - Target: dated-documentation — current Claude Code CLI reference; observed 2026-08-28 - Environment: local-default - Constraint (runtime): caller-supplied JSON Schema validation is available in print mode through --json-schema; JSON and stream-json envelopes are available through --output-format - Evidence: [Anthropic — Claude Code CLI reference](https://code.claude.com/docs/en/cli-reference) — documented; observed 2026-08-28 - Qualification note 2: Evidence checked 2026-08-28: Claude Code print mode documents both JSON/stream-JSON output and `--json-schema` validation against a caller-supplied JSON Schema. - preview: **Unknown** ### ChatGPT CLI (cli) - Harness: [ChatGPT CLI](/harnesses/chatgpt-cli.md) - current: **Unknown** - preview: **Unknown** ### Codex CLI (cli) - Harness: [Codex CLI](/harnesses/codex-cli.md) - current: **Unknown** - preview: **Unknown** ### OpenCode (cli) - Harness: [OpenCode](/harnesses/opencode.md) - current: **Unknown** - preview: **Unknown** ### Gemini CLI (cli) - Harness: [Gemini CLI](/harnesses/gemini-cli.md) - current: **Supported** - Target: dated-documentation — current Gemini CLI headless-mode documentation; observed 2026-08-28 - Environment: local-default - Constraint (runtime): documented JSON output is a product-defined response and statistics envelope; this evidence does not establish caller-supplied JSON Schema conformance - Evidence: [Google — Gemini CLI headless mode reference](https://geminicli.com/docs/cli/headless/) — documented; observed 2026-08-28 - Qualification note 3: Evidence checked 2026-08-28: Gemini CLI headless mode documents JSON and streaming JSON output with stable result, tool, error, and usage fields. - preview: **Unknown** ### Aider (cli) - Harness: [Aider](/harnesses/aider.md) - current: **Unknown** - preview: **Unknown** ### Goose (cli) - Harness: [Goose](/harnesses/goose.md) - current: **Unknown** - preview: **Unknown** ### Copilot CLI (cli) - Harness: [Copilot CLI](/harnesses/copilot-cli.md) - current: **Supported** - Target: dated-documentation — current GitHub Copilot CLI command reference; observed 2026-08-28 - Environment: local-default - Constraint (runtime): JSON output is a product-defined JSONL event envelope; this evidence does not establish caller-supplied JSON Schema conformance - Evidence: [GitHub — Copilot CLI command reference](https://docs.github.com/en/copilot/reference/copilot-cli-reference/cli-command-reference) — documented; observed 2026-08-28 - Qualification note 5: Evidence checked 2026-08-28: GitHub Copilot CLI documents `--output-format=json` as JSONL with one JSON object per line for programmatic execution. - preview: **Unknown** ### Amp (cli) - Harness: [Amp](/harnesses/amp-cli.md) - current: **Unknown** - preview: **Unknown**