# Session: Sprint 28 — MCP process_action Tool + SDK v0.22.0

**Date**: 2026-04-08
**Machine**: Legion
**Branch**: worker/web4-20260408-060000
**PR**: #145

## What Happened

Sprint 28 completed two tasks:

**T1: `web4_process_action` MCP tool** — Added the 8th MCP server tool, wrapping
`process_action_outcome()` for MCP clients. This completes 3-for-3 behavioral function
coverage in the MCP server (evaluate_trust, resolve_trust, process_action). The tool
accepts simple parameters (action_type, status, actor, role, rules JSON, profile_roles
JSON, atp_stake) rather than requiring a full R7Action JSON, matching the pattern of
the existing behavioral tools. 15 new tests across 5 classes.

**T2: SDK v0.22.0 release housekeeping** — Version bump 0.21.0 → 0.22.0, CHANGELOG,
README, docstring updates. Fixed stale PR #137 reference in CHANGELOG v0.21.0 (should
be #143). All metadata now reflects 8 MCP tools, 2600 tests, 364 exports.

## Key Technical Details

- `web4_process_action` constructs R7Action + ReputationEngine + TrustProfile + ATPAccount
  internally from simple MCP parameters
- Rules are passed as a JSON array string, parsed into ReputationRule objects
- T3/V3 use `as_dict()` (not `to_dict()`) — discovered in prior session
- ReputationEngine evaluates delta from R7Action's Role T3 (default 0.5), not from
  TrustProfile's T3 — the delta's `to_value` overwrites the profile value
- ActionOutcomeResult has no `to_dict()` — manual serialization required

## Challenges

This was a continuation session recovering from context overflow. The prior session had:
- Applied all code changes to the worker branch (mcp_server.py, test_mcp_server.py,
  test_mcp_process_action.py, pyproject.toml)
- But not yet applied metadata updates (test_cli.py, test_package_api.py, CHANGELOG,
  README, __init__.py, SESSION_FOCUS, SPRINT.md)

Recovery was straightforward — read files, apply remaining edits, test, commit, push, PR.

## Metrics

- Tests: 2585 → 2600 (+15)
- MCP tools: 7 → 8
- Exports: 364 (unchanged — tool is in mcp_server.py, not __init__.py)
- mypy strict: 0 errors (25 files)
- Files modified: 11 (9 existing + 1 new test file + 1 session doc = within constraints)

## SDK State After Sprint 28

- Version: 0.22.0
- 22 modules + MCP server
- 364 exports
- 2600 tests
- 8 MCP tools (5 data + 3 behavioral)
- 3 behavioral functions fully wrapped
- All 28 sprints COMPLETE
