project-retrospectivelisted

# Project Retrospective Analyze a project's session history by dispatching parallel historian agents to read each export, then synthesizing their findings into a structured analysis document. The value is in the **extraction criteria** — domain-specific signals tuned for Claude Code session exports, not generic summarization. ## Modes Two modes, differentiated by **output format** (not historian cost): | Mode | Output | When to Use | |------|--------|-------------| | **full** | Standalone ANALYSIS (superset, safe to delete prior) | Phase transitions, major incidents, no prior retro exists, reset the chain | | **incremental** | Delta UPDATE (references prior retro, never delete prior) | Periodic check-ins (every 3-5 sessions), ongoing projects with an existing retro baseline | Both modes reuse prior historian work when a prior retro exists — only NEW exports get fresh historians. The difference is what the synthesizer produces: a standalone document vs. a delta document. ## Arguments Parse `$ARGUMENTS` to determine scope and mode: | Argument | Behavior | |----------|----------| | *(none)* | **Context-aware default.** Check for prior retros first (Phase 1.5). If a prior retro exists, default to **incremental**. If no prior retro exists, default to **full**. | | `full` | **Explicit full mode.** User override — produce a standalone ANALYSIS. Still reuse prior historian work (only dispatch historians for new exports). | | `since-last-retro` | **Explicit incremental mode.**