> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase22-session02-antigravity-usage-consumers/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase22-session02-antigravity-usage-consumers` **Completed**: 2026-06-02 **Duration**: 0.2 hours

***

## Overview

Implemented the Antigravity usage consumers for phase 22. The usage panel now renders Antigravity as an additive free local-agent row from validated live data, and the home subscription ROI strip includes positive saved-equivalent value with a gated attribution chip. The session preserved the existing Claude, ChatGPT, Codex, and OpenRouter semantics.

***

## Deliverables

### Files Created

| File                                                                                         | Purpose                                                      | Lines |
| -------------------------------------------------------------------------------------------- | ------------------------------------------------------------ | ----- |
| `src/components/home/__tests__/subscription-strip.test.tsx`                                  | Focused ROI and attribution coverage for Antigravity states. | \~140 |
| `.spec_system/specs/phase22-session02-antigravity-usage-consumers/IMPLEMENTATION_SUMMARY.md` | Session closeout summary.                                    | \~80  |

### Files Modified

| File                                                                       | Changes                                                                            |
| -------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
| `src/components/usage-panel.tsx`                                           | Added Antigravity service typing, logo mapping, row gating, and metric rendering.  |
| `src/components/__tests__/usage-panel.test.tsx`                            | Added present, absent, zero, and regression coverage for Antigravity row behavior. |
| `src/lib/home-transforms.ts`                                               | Added pure Antigravity usage and saved-equivalent selectors.                       |
| `src/lib/__tests__/home-transforms.test.ts`                                | Added selector coverage for valid, absent, and invalid saved-equivalent values.    |
| `src/components/home/subscription-strip.tsx`                               | Added ROI contribution handling and gated attribution chip rendering.              |
| `src/components/home/logo-map.ts`                                          | Added Antigravity home logo mapping.                                               |
| `.spec_system/state.json`                                                  | Marked the session complete and advanced session history.                          |
| `.spec_system/PRD/phase_22/PRD_phase_22.md`                                | Updated phase progress and session tracker status.                                 |
| `.spec_system/PRD/phase_22/session_02_antigravity_usage_consumers.md`      | Marked the session complete in the phase record.                                   |
| `.spec_system/specs/phase22-session02-antigravity-usage-consumers/spec.md` | Marked the session spec complete.                                                  |
| `package.json`                                                             | Bumped the project patch version.                                                  |

***

## Technical Decisions

1. **Pure selectors first**: Centralized Antigravity parsing in `home-transforms` so UI components stay focused on rendering.
2. **Additive row behavior**: Kept Antigravity separate from paid spend and existing service semantics.

***

## Test Results

| Metric   | Value |
| -------- | ----- |
| Tests    | 85    |
| Passed   | 85    |
| Coverage | N/A   |

***

## Lessons Learned

1. Validated nested live-data should be projected through a shared selector before reaching component logic.
2. Gated attribution works best when the chip is derived from the same pure projection as the ROI math.

***

## Future Considerations

1. Session 03 should wire the setup wizard Hermes card and Dream sources strip.
2. Keep later home-surface additions aligned with the existing host/extension boundary.

***

## Session Statistics

* **Tasks**: 18 completed
* **Files Created**: 2
* **Files Modified**: 11
* **Tests Added**: 2
* **Blockers**: 0 resolved


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