{"slug":"fx","name":"fx","description":"Vercel Labs' coding agent harness written in Zig, built for research and for embedding in larger systems. A 6 MB CLI closer to a Unix shell than a terminal IDE.","layer":"harness","secondary_layers":[],"vendor":"Vercel Labs","homepage":"https://fx.sh","links":{"docs":"https://fx.sh/docs","repo":"https://github.com/vercel-labs/fx"},"icon":"i-simple-icons-vercel","platforms":["macos","linux","windows","web"],"hosts":[],"install":[{"method":"curl","command":"curl -fsSL https://fx.sh/setup.sh | bash"}],"license":{"spdx":"Apache-2.0","kind":"open-source","repo":"https://github.com/vercel-labs/fx"},"models":{"providers":["vercel-ai-gateway","openai","xai"],"plans":["chatgpt","grok"],"byok":"full","local":true,"notes":"Model-agnostic. Vercel AI Gateway login or key, ChatGPT and SuperGrok OAuth, direct provider keys, or local models."},"features":["subagents","mcp-client","acp-agent","sandboxing","plugins"],"wraps":[],"pricing":{"tiers":[{"id":"free","name":"Open source","price":0,"price_from":false,"per":"user","audience":"individual","contact_sales":false,"limits":["You pay the model provider or gateway you sign in with"]}]},"status":"preview","aliases":[],"sources":[{"url":"https://fx.sh","verified_at":"2026-08-24","covers":["pricing","general"]},{"url":"https://github.com/vercel-labs/fx","verified_at":"2026-08-23","covers":["platforms","models","features","license"]}],"open_source":true,"pricing_model":"free","has_free_tier":true,"entry_price":0,"effective_providers":["vercel-ai-gateway","openai","xai"],"wrapped_by":[],"freshness":{"verified_at":"2026-08-24","oldest":"2026-08-23","level":"success","computed_at":"2026-08-25T15:36:03.184Z"}}