~25 tasks across 7 phases, each with explicit Red-Green-Refactor TDD steps:
- Phase 1 (1.1-1.5): Foundation. 3-layer security module (8 unit tests
returning Result[Path]); SubMCP Protocol + MCPController class (6 unit
tests). Controller added ALONGSIDE the existing 45 functions in
mcp_client.py (no removal yet).
- Phase 2 (2.1-2.4): Backward compat. git mv mcp_client.py to
mcp_client_legacy.py; create new mcp_client.py as a slim shim
re-exporting 45+ old symbols. 12 legacy shim tests verify the surface.
The 4 existing test files + src/app_controller.py:61 still work.
- Phase 3 (3.1-3.4): FileIOMCP extracted (9 tools, 10 unit tests).
- Phase 4 (4.1-4.4): PythonMCP extracted (14 tools, 14 unit tests).
- Phase 5 (5.1-5.5): CMCP, CppMCP, WebMCP, AnalysisMCP extracted
(4 sub-MCPs, 18 unit tests; pattern mirrors Phase 3/4).
- Phase 6 (6.1-6.3): ExternalMCP extracted from mcp_client_legacy.
Class name preserved (ExternalMCPManager).
- Phase 7 (7.1-7.5): Update dispatch() in the legacy shim to use the
new controller (inverted-dict O(1) lookup); update docs; manual
smoke test; archive the track.
Each sub-MCP follows the same template (class with name / description
/ tools / invoke; security check for path-taking tools; Result wrapping
in invoke(); delegation to legacy functions for the actual implementation).
The sub-MCPs are thin adapters in v1; a future track can move the
implementations into the sub-MCP files directly.
Self-review at the end maps every spec section to a task (no gaps),
confirms zero placeholders, and verifies type/method-name consistency
across phases (SubMCP Protocol, MCPController class, Result[str,
ErrorInfo], _resolve_and_check all defined in Phase 1; used
consistently across Phases 3-6).
Track + metadata + state + tracks.md registration for the 2,205-line
mcp_client.py split into a slim controller + 6 native sub-MCPs + 1
external sub-MCP.
Key design decisions (per user feedback):
- Naming convention: mcp_<type>.py for native MCPs (mcp_file_io.py,
mcp_python.py, mcp_c.py, mcp_cpp.py, mcp_web.py, mcp_analysis.py).
- ExternalMCPManager class name preserved (moves to mcp_external.py).
- Sub-MCP shape: class with name / description / tools / invoke().
- MCPController: holds ALL_SUB_MCPS list, inverted-dict tool lookup,
3-layer security (extracted to mcp_client_security.py), schema
aggregation.
- Each invoke() returns Result[str, ErrorInfo] (from
data_oriented_error_handling_20260606).
- Backward compat: mcp_client_legacy.py re-exports all 45+ old
symbols; the 4 existing test files + src/app_controller.py:61
direct call continue to work.
DSL future (per user notes on APL/K/Cosy): NOT in this track.
Documented in spec §12.1 as the mcp_dsl_20260606 follow-up.
Sub-MCP architecture is the natural unit to pair with a DSL emitter.
7 phases. ~22 task slots. New tests: 9 (one per sub-MCP + controller +
security + legacy). Modified tests: 4 (existing mcp_* tests must
pass unchanged).
Blocked by: data_oriented_error_handling_20260606, data_structure_strengthening_20260606.
Blocks: mcp_dsl_20260606 (future DSL track).
ed