# 148 - 2026-03-24: Tool layering policy foundation

**Status**: ✅ Completed  
**Type**: Docs / Policy Foundation  
**Task**: TASK-113-01, TASK-113-02-01

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## Summary

Created the first concrete documentation foundation for `TASK-113`.

The repo now has:

- one canonical policy source for tool layering and public-surface rules
- an explicit superseded-notation rule
- a first documented surface/profile exposure matrix

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## Changes

- added canonical policy doc:
  - `_docs/_MCP_SERVER/TOOL_LAYERING_POLICY.md`
- linked the policy doc from:
  - `README.md`
  - `_docs/_MCP_SERVER/README.md`
  - `_docs/AVAILABLE_TOOLS_SUMMARY.md`
  - `_docs/_DEV/README.md`
  - `ARCHITECTURE.md`
- moved `TASK-113` to `In Progress`
- marked `TASK-113-01`, `TASK-113-01-01`, `TASK-113-01-02`, and `TASK-113-02-01` as completed

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## Files Modified (high level)

- `_docs/_MCP_SERVER/TOOL_LAYERING_POLICY.md`
- `README.md`
- `_docs/_MCP_SERVER/README.md`
- `_docs/AVAILABLE_TOOLS_SUMMARY.md`
- `_docs/_DEV/README.md`
- `ARCHITECTURE.md`
- `_docs/_TASKS/TASK-113*`
- `_docs/_CHANGELOG/README.md`
