feat(mcp): add MCP gateway — 14 tools over SSE, all agent calls forced local
Architecture:
- agent_service/mcp/tools.py: 14 Tool definitions with JSON schemas
dispatch, finance_query, accounting_query, crm_query, sales_query,
project_query, elearning_query, expenses_query, employees_query,
get_health, list_agents, trigger_sweep, get_pending_approvals, approve_directive
- agent_service/mcp/server.py: mcp.Server with list_tools + call_tool handlers
- agent_service/routers/mcp_router.py: Starlette routes at /mcp/sse + /mcp/messages
- main.py: mounts MCP routes alongside existing FastAPI routers (graceful fallback if mcp not installed)
Privacy guarantee (enforced in server.py, not by convention):
- _force_local_context() sets llm_router._privacy_mode = 'local' before EVERY agent call
- _restore_mode() restores original mode after the tool returns
- HIPAA agents (finance, accounting, expenses, employees) were already Ollama-only;
MCP adds a second enforcement layer for all 8 agents
- MCP client (e.g. Claude Code CLI) receives only tool results — no LLM completions cross the boundary
Usage (Claude Code CLI):
claude mcp add --transport sse http://192.168.2.47:8001/mcp/sse
or copy claude_mcp_config.json to ~/.claude/mcp_servers.json
requirements.txt: added mcp==1.3.0
tests/test_mcp_server.py: 13 tests covering tool count, schemas, HIPAA labelling, privacy override
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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