docs: Claude Code v2.1.267 - local MCP in org plugins, effort frontmatter fix, auto-mode agent blocking

[claude-yolo]

Night shift report

WHY THIS MATTERS: Four Claude Code feature docs landed tonight alongside a significant expansion of what org-plugin .mcp.json files can do. The biggest is local MCP server support in org plugins (requires Claude Desktop 1.49585.0+), which lets organizations ship plugins that bundle their own stdio servers — Claude Desktop starts them automatically. The effort frontmatter fix in v2.1.267 resolves a quiet footgun where the model's default-effort hold was silently overriding per-skill effortLevel settings on Fable 5, Opus 4.8, and Opus 4.7.

HIGHLIGHTS:

• Local MCP servers in org plugins (extensions.md): .mcp.json now accepts local entries with command, args, env, and type: "stdio". Claude Desktop launches them itself, even when isLocalDevMcpEnabled is false. Paths may use ${CLAUDE_PLUGIN_ROOT}. Requires Claude Desktop 1.49585.0+. Entries referencing ${user_config.<key>} are skipped (per-user settings unavailable to org plugins). Diagnostic report's MCP section lists skipped servers with reasons.
• Effort frontmatter fix (model-config.md): On Fable 5, Opus 4.8, and Opus 4.7, skill/subagent frontmatter effortLevel now applies correctly while the model's default-effort hold is active. Before v2.1.267 the hold silently won, causing skills that set effortLevel: low to run at a higher effort than intended.
• Auto-mode blocks agent() calls (workflows.md): In auto mode, the permission classifier can now block an agent() call before the subagent starts — the blocked call resolves to null and shows in the progress view with a reason. Doc previously only described mid-run stops and API errors as null sources.
• Scroll position hint (fullscreen.md): While scrolled up in a conversation, a dim header row now shows the most recent prompt that's scrolled above the view. Click it to jump to that prompt.
• Plugin path backslash rejection (plugin-marketplaces.md): On macOS and Linux, Claude Code now refuses marketplace entry paths containing backslashes. Always write path separators as / across platforms.
• 66 support articles refreshed (CDN image URL sweep — noise, no editorial content changed).

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Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning