[Phase 3] Consolidate 3 more skills into the Bundle CLI (slash, mcp-builder, marketplace)

[Delqhi]

Summary

Skill-Audit-Matrix (docs/skill-audit-matrix.md, commit b9e7b42) identified 5 consolidation candidates. Phase 2 (CoDocs merge into SIN-Code-Codocs-Skill) is DONE (v1.0.0, 2026-06-06).

This issue tracks Phase 3: 3 more skills that are arguably better as subcommands of the sin-code-bundle CLI than as standalone skills.

Candidates

🥈 sin-slash → sin slash subcommand

Aspect	Current (as skill)	Proposed (as subcommand)
Repo	OpenSIN-Code/SIN-Code-Slash-Skill	Part of OpenSIN-Code/SIN-Code-Bundle
Tests	146 passed	Migrated to SIN-Code-Bundle/tests/cli/slash/
Surface	Standalone CLI + MCP server	sin slash <list|register|unregister|history|help>
Opencode integration	Via MCP	Via CLI in command config

Why: opencode has a command top-level key in opencode.json for custom slash commands. A skill that manages slash commands is one level of indirection above what's needed. A sin slash subcommand that adds/removes entries in opencode.json.command directly is simpler and faster.

Effort: 1h (move logic, add CLI, update opencode.json)

🥉 sin-mcp-server-builder → sin mcp-server subcommand

Aspect	Current (as skill)	Proposed (as subcommand)
Repo	OpenSIN-Code/SIN-Code-Mcp-Server-Builder-Skill	Part of SIN-Code-Bundle
Tests	120 passed	Migrated
8 tools	scaffold, template_list, add_tool, test, register, validate, publish, audit	sin mcp-server <scaffold|add-tool|test|register|...>

Why: Scaffolding MCP servers is a meta-operation on the Bundle itself (which is itself a multi-MCP-server bundle). Belongs in the same CLI as the rest of the bundle operations.

Effort: 2h (move 8 tools, port tests)

4️⃣ sin-marketplace → sin marketplace subcommand

Aspect	Current (as skill)	Proposed (as subcommand)
Repo	OpenSIN-Code/SIN-Code-Marketplace-Skill	Part of SIN-Code-Bundle
Tests	97 passed	Migrated
24 MCP tools	search, install, update, etc.	sin marketplace <search|install|list|update>

Why: The marketplace is the catalog of all SIN-Code tools. The Bundle already imports/installs these tools. sin marketplace is the natural way to discover and add to the bundle.

Effort: 1.5h (move logic, port tests)

Why this matters

After Phase 3:

• Skill count: 17 → 14 (3 fewer skills to maintain)
• CLI surface: more unified — all meta-operations under sin <verb>
• Less indirection — no more "skill that helps you write skills"
• Single install — pip install sin-code-bundle gets everything
• Fewer MCP servers — slash + mcp-builder + marketplace are no longer MCP servers, just CLI subcommands

Why NOT do this

• Skill is more discoverable in opencode.json — agent can see it in baseline and load the SKILL.md automatically
• MCP server = stateful — if any of these need persistent state across calls, they're better as MCP
• Loss of vendor independence — if you bundle marketplace into Bundle, breaking the Bundle breaks marketplace too

Proposed action plan

Phase 3.1: sin-slash (low risk, 1h)

• Move sin-slash Python code into SIN-Code-Bundle/src/sin_code_bundle/cli/slash.py
• Add slash subcommand to Bundle CLI
• Port 146 tests
• Update opencode.json to use the new subcommand
• Deprecate SIN-Code-Slash-Skill repo (keep as read-only archive)

Phase 3.2: sin-mcp-server-builder (medium risk, 2h)

• Move 8 tools into SIN-Code-Bundle/src/sin_code_bundle/cli/mcp_server/
• Add mcp-server subcommand
• Port 120 tests
• Update ceo-audit / sin-codocs workflows that use the meta-skill
• Deprecate SIN-Code-Mcp-Server-Builder-Skill

Phase 3.3: sin-marketplace (medium risk, 1.5h)

• Move logic into SIN-Code-Bundle/src/sin_code_bundle/cli/marketplace.py
• Add marketplace subcommand
• Port 97 tests
• Update Infra-SIN-OpenCode-Stack to use new subcommand
• Deprecate SIN-Code-Marketplace-Skill

Acceptance criteria

• 3 skills deprecated (READMEs marked DEPRECATED with migration table)
• 3 new Bundle subcommands live: sin slash, sin mcp-server, sin marketplace
• 363 tests migrated (146 + 120 + 97), all passing
• opencode.json baseline reduced from 17 → 14
• PyPI sin-code-bundle v1.0.0 release with all 3 subcommands
• Skill-Audit-Matrix updated: docs/skill-audit-matrix.md (Phase 3 marked DONE)

Related

• Phase 2 (DONE): sin-codocs + sin-codocs-sprint → SIN-Code-Codocs-Skill v1.0.0
• Audit-Matrix: SIN-Code-Bundle/docs/skill-audit-matrix.md (commit b9e7b42)
• Sister issue: [Tech Debt] SIN-Code-Bundle has 7 vendored sub-projects — should be promoted to standalone repos #28 (Bundle sub-projects cleanup)