feat(mcp): GET /api/v1/mcp/skill — env-customized Agent Skill download (#2714)#2728
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#2714) renderSkillMarkdown had no HTTP outlet. Serve it from the runtime dispatcher as text/markdown via the raw stream channel (the response channel JSON-encodes bodies), public like /discovery, 404 when the MCP surface is opted out, 501 without the mcp service; URL from auth getMcpResourceUrl() with request-host fallback. Live-verified on showcase (raw markdown + headers + URL injection). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📓 Docs Drift CheckThis PR changes 2 package(s): 21 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:
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This was referenced Jul 10, 2026
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#2714 Phase 1 — the framework dependency called out in objectstack-ai/objectui#2363:
renderSkillMarkdown()(the ONE generic skill, ADR-0036 Amendment C) had no HTTP outlet.What
GET /api/v1/mcp/skillserves the environment-customizedSKILL.mdastext/markdown(+content-disposition: inline; filename="SKILL.md",cache-control: no-store— same reasoning as/discovery, cloud#152)./discovery: the content is generic agent instructions plus a URL the caller already knows — no schema, no tenant data./mcp: 404 whenOS_MCP_SERVER_ENABLED=false(nothing advertised), 501 when the MCP plugin isn't loaded, 405 (+Allow) for non-GET.getMcpResourceUrl()first, request-host (host+x-forwarded-proto) fallback, documented placeholder last.MCPServerRuntime.renderSkill()exposes the renderer through the registered'mcp'service, so the runtime keeps zero dependency on@objectstack/mcp(same duck-typed seam ashandleHttpRequest).resultstream channel (single-chunk) — theresponsechannel JSON-encodes bodies unconditionally, which would have shipped a quoted string.Verification
http://localhost:3210/api/v1/mcpinjected into the Connect section from the request host.Refs #2714, objectstack-ai/objectui#2363.
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