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# Implementation Summary

**Session ID**: `phase22-session01-antigravity-detection-data-contract` **Completed**: 2026-06-02 **Duration**: 0.5 hours

***

## Overview

Extended the local app-detection contract so Antigravity now reports independent IDE and CLI surfaces, safe conversation usage metadata, and a bounded saved-equivalent value. The session kept the contract additive, updated validators and fixtures to match the new shape, and locked the behavior down with focused detector and live-data tests.

***

## Deliverables

### Files Created

| File                                              | Purpose                                                                | Lines |
| ------------------------------------------------- | ---------------------------------------------------------------------- | ----- |
| `src/lib/__tests__/antigravity-live-data.test.ts` | Focused client validation coverage for the Antigravity nested contract | \~119 |

### Files Modified

| File                                           | Changes                                                                                                                  |
| ---------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| `scripts/lib/app-detection.ts`                 | Added Antigravity IDE and CLI detection, safe conversation scanning, last-active metadata, and saved-equivalent emission |
| `scripts/lib/__tests__/app-detection.test.ts`  | Added coverage for absent, IDE-only, CLI-only, dual-surface, malformed, and privacy-sensitive cases                      |
| `src/lib/live-data-types.ts`                   | Added Antigravity surface and usage types to the shared live-data contract                                               |
| `src/lib/validate-live-data.ts`                | Normalized Antigravity nested payloads and preserved safe defaults for absent or malformed data                          |
| `src/lib/__tests__/validate-live-data.test.ts` | Added validator coverage for valid, absent, and malformed Antigravity payloads                                           |
| `src/data/live-data.example.json`              | Updated committed fallback data to include the safe Antigravity shape                                                    |
| `tests/e2e/fixtures/live-data.ts`              | Aligned browser fixtures with the same safe Antigravity fallback shape                                                   |
| `src/components/setup/detection-helpers.ts`    | Adjusted setup detection typing to accept the broader additive contract                                                  |

***

## Technical Decisions

1. **Additive contract shape**: Kept top-level Antigravity compatibility fields while adding nested `surfaces` and `usage` so existing consumers continue to work.
2. **Read-only metadata only**: Limited conversation scanning to filenames and mtimes, with no prompt, transcript, or credential parsing.

***

## Test Results

| Metric   | Value |
| -------- | ----- |
| Tests    | 93    |
| Passed   | 93    |
| Coverage | N/A   |

***

## Lessons Learned

1. Privacy assertions need to distinguish raw path leakage from safe aggregate counts.
2. The validator and example data stay safest when they move together with the scanner contract.

***

## Future Considerations

1. Session 02 can consume the new `usage.savedEquivalent` field directly without more detection changes.
2. Session 03 can reuse the Antigravity state for the Dream source-status strip.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 1
* **Files Modified**: 8
* **Tests Added**: 3
* **Blockers**: 0 resolved


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