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* feat(community): add Unbrowse web fetch provider Add a community web_fetch provider backed by Unbrowse (https://unbrowse.ai), a hosted service that returns a page as markdown, over plain HTTP when that is enough and through a cloud browser when the page needs JavaScript. The tool sends one JSON-RPC tools/call POST (unbrowse.scrape) to Unbrowse's MCP endpoint, so it needs no extra Python package and no MCP client (uses httpx, already a dependency). Unbrowse is not a general web search engine, so only web_fetch is added. Changes: - backend/packages/harness/deerflow/community/unbrowse/{__init__,tools}.py web_fetch_tool with the same output shape as the Sofya, Exa and Firecrawl fetch tools (# <title> plus markdown, 4KB cap). API key is read from the config.yaml api_key field or the UNBROWSE_API_KEY env var. Optional render: auto|never|always; unknown values log a warning and fall back to auto. JSON-RPC errors, isError tool results, HTTP errors and malformed payloads come back as "Error: ..." strings. - backend/tests/test_unbrowse_tools.py: key resolution, render handling, request shape, structuredContent vs text payloads, error paths. - scripts/doctor.py, scripts/wizard/providers.py: register the key and the web_fetch provider; backend/tests/test_doctor.py covers both doctor paths. - config.example.yaml, .env.example, backend/docs/CONFIGURATION.md, tools/AGENTS.md, EN/ZH harness/tools.mdx: document the provider. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * docs(changelog): add Unbrowse web_fetch provider entry Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>