MCP Gateway Engineering Guide

Ownership

This repository owns the Python MCP Gateway boundary:

MCP tool names, descriptions, input Schema, local/public registration, and HTTP route mapping.
MCP protocol adaptation, safe display DTOs, request/session forwarding, and Gateway operations.
The cross-repository integration entry point and operator-facing runbook.

Business ownership remains outside this repository:

Y:/fmsoperate: tool routes, Validate/Logic/Model, registry state, business permissions, data scope, exports, and access logs.
Y:/base: employee identity, Gateway device sessions, MCP token lifecycle, and authentication decisions.
Y:/home: employee UI and thin proxy only.
Y:/settlement_tests: cross-repository PHP contract tests.

Other repositories should link to this repository's README and project docs instead of copying the Gateway contract.

Hard Boundaries

Keep the Gateway thin. It must not query business databases or reproduce logistics rules.
Never decide employee, company, menu, or data permissions in Python. Forward the authenticated context to ThinkPHP.
Never accept caller-supplied employee, company, role, permission, or internal identity overrides.
Public requests use a GWS_xxx device credential to load a Redis Gateway session and its server-side mcp_token.
Never log tokens, full Gateway credentials, cookies, authorization headers, or raw backend responses.
Local and public tool registries must stay identical. Actual visibility is the intersection with the enabled-tool list returned by fmsoperate; failures close access.
query_order is the legacy display exception. All other registered tools use services/output_presenter.py and must fail closed on unknown fields, malformed responses, or unknown errors.
initialize and tools/list are not rate limited. tools/call is limited per authenticated device session and tool.
The retired authorization-code binding flow must not return to the runtime without a new security review.

Documentation Routes

README.md: current tool catalog, routes, configuration, operations, and troubleshooting.
Y:/all_project_docs/mcp/overview.md: current system summary and cross-repository ownership map.
The same directory's requirements.md, tech-specs.md, user-structure.md, and timeline.md: current contracts, architecture, flows, and operational handoff.
Y:/all_project_docs/mcp/guides/mcp-team-sharing.md: current team onboarding and sharing guide.
docs/superpowers/specs/: dated design decisions and ADR-like context.

The following are not authoritative and are not read by default:

.planning/**: temporary session state; archive or remove from the active workspace after delivery.
Completed docs/superpowers/plans/**: execution history, not the current contract. When a temporary plan finishes, promote durable facts into README/project docs, record the milestone once, then retire the plan. Do not keep completed checklists as active instructions.

If Y:/all_project_docs is unavailable, stop changes to contracts, architecture, databases, or deployment behavior and report the missing documentation repository instead of relying on stale information.

Change Rules

Update tool metadata, both registries, CLI forwarding, Presenter mapping, and tests together when adding or changing a tool.
Keep tool selection zero-inference: ambiguous result intent or number type requires a user question before any call.
Keep request_id across Gateway, PHP, responses, and logs; public ingress generates the trusted trace ID.
Changes that affect fmsoperate or base contracts require matching changes and tests in those owning repositories.
Do not run registry SQL or restart a shared Gateway process unless the task explicitly authorizes that operational action.

Verification

Run from Y:/mcp:

python -m unittest discover -s tests -p "test_*.py"
python -m coverage run -m unittest discover -s tests -p "test_*.py"
python -m coverage report -m --fail-under=100
git diff --check

Verify the code registry without relying on documentation:

python -c "from app import GatewayApp; print('\n'.join(GatewayApp().registered_tool_names()))"

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