feat: add you-search skill for keyless You.com web search

[valueadd-lgtm]

What

• New you-search skill: web search through You.com's hosted MCP endpoint
• Mirrors the existing tavily-search layout — SKILL.md + scripts/search.mjs (Node ≥18, global fetch, zero npm dependencies)

Why

The catalog already covers several web-search providers (brave, tavily, duckduckgo, baidu). You.com's free MCP profile has the same zero-setup property that makes the DuckDuckGo skill handy — no API key, no signup — so it slots in as another opt-in option for live-information queries. Setting YDC_API_KEY switches the same script to the authenticated endpoint (https://api.you.com/mcp) for the full toolset, with no other usage changes.

How to test

# keyless — no setup
node skills/you-search/scripts/search.mjs "python asyncio tutorial" -n 3

# authenticated (optional)
YDC_API_KEY=*** node skills/you-search/scripts/search.mjs "python asyncio tutorial"

Validation I ran:

• Skill auto-registers through the existing SkillLoader filesystem discovery — skills/you-search/SKILL.md frontmatter parses (name: you-search, user-invocable: true), 198 skills discovered, no registry files changed
• python -m compileall -q app agent_core agents decorators skills — clean (no .py files added)
• ruff check . and ruff format --check . — clean
• Live keyless run returns real results in the same ## Sources format the tavily script uses; -n clamps to 20; no-args prints usage and exits 2
• A bad YDC_API_KEY surfaces a clean one-line error (server 401 carried through the MCP result), no stack trace

Notes

• Strictly additive: new directory only — no existing skills, defaults, or Python touched
• The script speaks the MCP streamable-HTTP JSON-RPC flow (initialize → notifications/initialized → tools/call you-search), with mcp-session-id passthrough and both plain-JSON and SSE response parsing
• You.com also publishes its MCP configs and agent skills for other harnesses at youdotcom-oss/agent-skills, in case that's useful context for catalog curation
• Tracking: Integration: CraftOS-dev/CraftBot — you-search skill in the skills catalog youdotcom-oss/integration-tracking#451

Happy to adjust the shape (e.g. allowed-tools frontmatter or different output format) if you'd prefer a different convention.

[zfoong]

Thanks a lot @valueadd-lgtm. We will review the PR when the development cycle for V.1.4.4 is moved to dev branch! Meanwhile, feel free to join the CraftBot Discover server to follow our journey: https://discord.gg/bSdZf9HSgq

[valueadd-lgtm]

Thanks @zfoong! I'll keep an eye out for the V1.4.4 dev cycle — happy to rebase the skill or adjust it if the skills format changes in the meantime. Looking forward to the review.