# Session Log: Plugin Plan Rubber-Duck Review

**Date:** 2026-04-23T18:40:02Z  
**Session Type:** Rubber-Duck + Plan Refinement  
**Agents:** rubber-duck-plugin-plan, kelso-plugin-plan  
**Duration:** 2 turns (rubber-duck) + 3 turns (kelso refinement)

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## Summary

Kelso's Copilot CLI plugin plan for ExcelMcp underwent structured rubber-duck critique, yielding **4 critical + 4 moderate findings**. User approved all fixes and authorized **Phase -1 (Spike)** to validate the install mechanism before proceeding to Phases 0–4.

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## Key Decisions

✅ **Accept all 4 critical findings:**
  1. Wrapper script for missing-binary detection
  2. Phase -1 spike to validate `{pluginDir}` placeholder expansion
  3. GitHub App auth (replace PAT)
  4. SHA256 checksum verification in download.ps1

✅ **Phase -1 (Spike) added** — BLOCKING checkpoint before Phase 0  
✅ **Plan refined** to incorporate all findings  
✅ **Answers to 5 open questions** documented

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## Findings Accepted

**Critical:** 4  
**Moderate:** 4  
**Open Questions:** 5 (all answered)

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## Next Phase

Kelso proceeds to Phase -1: Create minimal "hello-world" plugin, validate install flow, document working mechanism.

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## Artifacts

- `.squad/orchestration-log/2026-04-23T18-40-00Z-rubber-duck-plugin-plan.md` — Critique log
- `.squad/orchestration-log/2026-04-23T18-40-01Z-kelso-plugin-plan-refinement.md` — Refinement log
- `.squad/decisions/inbox/kelso-spike-first-and-fixes.md` — Full decision record
