gabszap · Oct 17, 2026 · Sep 29, 2026 · Sep 29, 2026 · Sep 29, 2026 · Sep 29, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,7 +4,59 @@ All notable changes to `session-migrate` are recorded
 here. Native format compatibility is documented separately in
 [`docs/format-compatibility.md`](docs/format-compatibility.md).
 
-## Unreleased
+## 0.12.1 - 2026-10-16
+
+- Accept the compaction loop Claude Code records when the compact summary is not
+  the boundary's direct child. The declaration is unchanged, but how many
+  attachment records the CLI interleaves varies, so the summary can sit three or
+  four parent hops below its boundary, and `preservedMessages` also names ids
+  from the summarized branch that are no longer on the active path. A readable
+  73 MB transcript with two compactions was refused as `Claude active graph
+  contains an ancestry cycle`; the loop is now validated as declared (the tail
+  walks up to the summary, the summary up to the boundary, every hop already on
+  the walked path) and a declaration that does not close still fails.
+- Import a bundle the target store caps at 5 MiB per session by raising the
+  budget to what the bundle needs — never past the 25 MiB that store's own web
+  import accepts — and reporting `target_import_budget_raised` in the manifest.
+  A session carrying pasted screenshots (inline base64 images) produced a
+  6.88 MB bundle and was refused with `session exceeds the import size limit`,
+  although the store keeps that content.
+
+## 0.12.0 - 2026-10-16
+
+- Resolve the Hermes home the way the CLI does: `HERMES_HOME` when set,
+  otherwise `%LOCALAPPDATA%\hermes` on Windows and `~/.hermes` elsewhere. A bare
+  `~/.hermes` on Windows named a directory the CLI never writes to, so
+  `--to hermes` (and catalog discovery) missed the real store unless the caller
+  exported `HERMES_HOME` by hand.
+- Move the Hermes import bundle across the process boundary as UTF-8 bytes
+  (`sys.stdin.buffer`, explicit stdout/stderr decoding, `-X utf8` child) instead
+  of locale-encoded text. On a Windows console whose code page is not UTF-8 the
+  old path replaced every non-ASCII character in the imported conversation —
+  title and message bodies — with `U+FFFD`.
+- Install a Hermes session untitled instead of refusing the migration when the
+  target store already holds that title: Hermes enforces a partial unique index
+  over non-null titles, and its own importer treats the field as cosmetic. The
+  omission is counted as `title:duplicate_in_target` and reported as a
+  `target_title_omitted` manifest warning.
+- Promote the Hermes Agent adapter to 0.22.2 (tag `v2026.9.24`) and SQLite
+  schema 31, keeping `SessionDB.import_sessions` as the native write boundary.
+- Resolve the 0.22.2 runtime through `hermes --print-runtime-command` and
+  reproduce the launcher's `hermes_bootstrap` prelude, so the installer works
+  with a store Python that ships without third-party packages. The install root
+  comes from `hermes --version` (or the launcher's own bootstrap), and the
+  launcher shebang remains the fallback for builds predating the flag.
+- Fix Hermes installation on Windows: keep the Windows essentials in the
+  sanitized child environment, initialize a missing `state.db` through the
+  native `SessionDB` constructor, and close the manifest identity guard before a
+  rollback unlinks it (`WinError 32`).
+- Add first-class support for Antigravity Desktop (macOS/Electron) 2.18.1
+  with bidirectional conversion, SQLite schema adaptation, Hub Summaries
+  Protobuf cache synchronization (`agyhub_summaries_proto.pb`), project-scoped
+  sidebar discovery, and verified native Go language server integration.
+- Document the clean-room Antigravity Desktop storage architecture, Protobuf
+  wire formats, Connect-RPC interfaces, and collision invariants in
+  `docs/antigravity-desktop-format.md`.
 
 ## 0.11.0 - 2026-09-11
 

diff --git a/docs/antigravity-desktop-format.md b/docs/antigravity-desktop-format.md
@@ -0,0 +1,189 @@
+# Antigravity Desktop session format
+
+`session-migrate` supports Antigravity Desktop (macOS, Linux, and Windows)
+through a clean-room adapter pinned to the 2.18.1 release:
+
+| Property | Pinned value |
+| --- | --- |
+| Application | Antigravity Desktop `2.18.1` (Electron `44.3.0`) |
+| macOS arm64 binary | `148,990,608` bytes, SHA-256 `300ee20f3108a511be1149602b91ba84cbbdcc42213067151e255584129be30f` |
+| Linux x64 binary | `181,432,528` bytes, SHA-256 `ab4937445fa3817bc374a1db71062de7daecdb093cbfb6bd36b80f443198670e` |
+| Windows x64 binary | `163,640,320` bytes, SHA-256 `1ed84e6a1d1e51064d80c9f382ab3a519eb2775cb91d552c63064a18cfdf3cf2` |
+| Conversation store | `<home>/.gemini/antigravity/conversations/<uuid>.db` |
+| Picker index | `<home>/.gemini/antigravity/conversation_summaries.db` (`PRAGMA user_version = 3`) |
+| Hub summary cache | `<home>/.gemini/antigravity/agyhub_summaries_proto.pb` |
+| UI project catalog | `<home>/.gemini/config/projects/<id>.json` + `app_storage.json` |
+
+This is deliberately not a claim of compatibility with unreleased or arbitrary
+Antigravity versions. Automatic installation checks executable digests and
+schema invariants when native verification is requested.
+
+No vendor code, binaries, descriptors, credentials, or user transcripts are
+included in this repository. All schemas, wire mappings, and RPC endpoints were
+established through clean-room differential probing and synthetic test fixtures.
+
+## How the format was established
+
+The adapter was derived from independent observations of synthetic sessions and
+package analysis across macOS, Linux, and Windows distributions:
+
+1. generate synthetic conversations with unique marker text in isolated environments;
+2. inspect SQLite schema, columns, and Protobuf wire field numbers and types;
+3. analyze Electron application resources (`app.asar`), verifying identical JavaScript
+   (`3c03ce352dc3c1b43f357c27ead1f73c74d198a8ded89b1b3d6a2539e7a6ac5c`) across all three OSes;
+4. inspect native Go language server (`language_server`) symbols and Connect-RPC endpoints;
+5. verify round-trip serialization and cold-reload step retrieval via Connect-RPC
+   (`GetCascadeTrajectorySteps`); and
+6. test real-world conversation migration end-to-end with active multi-turn sessions.
+
+## SQLite layout
+
+Each conversation is stored as an independent SQLite 3 database with write-ahead
+logging (`WAL`) containing these tables:
+
+```text
+trajectory_meta
+steps
+gen_metadata
+executor_metadata
+parent_references
+trajectory_metadata_blob
+battle_mode_infos
+```
+
+While the table names match Antigravity CLI, Desktop enforces distinct wire and
+metadata invariants:
+
+| Property | Antigravity CLI (`antigravity`) | Antigravity Desktop (`antigravity-desktop`) |
+| --- | --- | --- |
+| App data subdirectory | `~/.gemini/antigravity-cli` | `~/.gemini/antigravity` |
+| `trajectory_meta.source` | `17` (`CLI`) | `1` (`IDE` / `Hub`) |
+| `trajectory_metadata_blob` project ID | `"default-cli-project"` | `"outside-of-project"` (or workspace UUID) |
+| `conversation_summaries.source` | `"antigravity-cli"` | `""` (empty string) |
+| `conversation_summaries.app_data_dir` | `"antigravity-cli"` | `"antigravity"` |
+| `conversation_summaries.status` | `""` (empty string) | `"CASCADE_RUN_STATUS_IDLE"` |
+| `conversation_summaries.project_id` | `"default-cli-project"` | `"outside-of-project"` |
+| Summary columns | 19 or 21 columns | 21 columns (includes `raw_summary`, `group_id`) |
+| Subagent trajectory roots | root ID == conversation ID | root ID points to root cascade ID |
+
+The main `trajectory_meta` row stores a fresh trajectory UUID, conversation UUID,
+trajectory type `4` (cascade), and source `1` (`IDE`/`Hub`). `steps.idx` is a
+contiguous zero-based sequence. Every step duplicates its type and status in
+both the SQLite row columns and the serialized `Step` blob.
+
+### Sidebar discovery and project grouping
+
+Antigravity Desktop filters sidebar conversations strictly by active projects:
+
+1. **Active Projects List**: Tracked in `app_storage.json` under `projectsOrder`.
+   - macOS: `~/Library/Application Support/Antigravity/app_storage.json`
+   - Linux: `$XDG_CONFIG_HOME/Antigravity/app_storage.json` (or `~/.config/Antigravity`)
+   - Windows: `%APPDATA%\Antigravity\app_storage.json`
+2. **Project Configurations**: Stored in `~/.gemini/config/projects/<id>.json`,
+   defining `project_id`, workspace paths, and display labels.
+3. Unassociated conversations (`project_id = "outside-of-project"`) are not
+   grouped in the project tree; assigning a registered project ID ensures instant
+   sidebar visibility.
+
+## Protobuf subset and Hub cache
+
+The adapter contains a bounded wire codec without generated vendor classes. It
+accepts canonical varints, length-delimited bytes, and fixed 32/64-bit wire types.
+
+The `Step` envelope uses:
+
+| Field | Meaning |
+| --- | --- |
+| `1` | step type enum |
+| `4` | step status enum |
+| `19` | user-input payload when type is `14` (`CORTEX_STEP_TYPE_USER_INPUT`) |
+| `20` | planner-response payload when type is `15` (`CORTEX_STEP_TYPE_PLANNER_RESPONSE`) |
+| `140` | generic-tool payload when type is `132` (`CORTEX_STEP_TYPE_GENERIC_TOOL`) |
+
+Status `3` is done, status `5` is cleared, and status `7` is error. User-input
+field `2` stores visible user text. Planner-response field `1` stores visible
+assistant text, field `6` stores a fresh message ID, and repeated field `7`
+stores tool calls.
+
+### Hub summary cache (`agyhub_summaries_proto.pb`)
+
+Antigravity Desktop caches summaries in `agyhub_summaries_proto.pb`. On startup,
+the native Go process reconciles SQLite records with this protobuf cache. If a
+conversation exists in SQLite but has no entry in the cache or `raw_summary`
+column, metadata fields reset to zero defaults (`0001-01-01`). The adapter
+synchronizes both stores during installation.
+
+## Conversion policy
+
+| Portable event | Antigravity Desktop representation |
+| --- | --- |
+| User text | done user-input step |
+| Assistant text | done planner-response step |
+| Tool call | planner-response tool call |
+| Tool result | following generic-tool step |
+| Thinking/reasoning | omitted and counted as `thinking:private` |
+| Compaction | omitted and counted |
+| System/developer message | omitted as privileged context |
+| Images and other context | omitted by type and counted |
+| Unknown/opaque source event | omitted by reason and counted |
+
+Private chain-of-thought is not portable. Thinking bytes and model signatures are
+omitted from generated outputs, and source reading emits only a content-free
+`thinking` marker.
+
+A tool result without a preceding call receives a fresh synthetic call and an
+explicit orphan counter. Duplicate or out-of-order IDs are rewritten or counted
+to prevent corrupted native trajectories.
+
+## Reading and installation
+
+Source databases may have active write-ahead logs (`.db-wal`). The reader uses
+SQLite's backup API to obtain a transactionally consistent snapshot, then hashes
+and parses that snapshot. It validates:
+
+- exact table, column, and schema invariants;
+- SQLite page bounds and `integrity_check`;
+- valid canonical UUIDv4 IDs and source `1` / `17` discrimination;
+- contiguous step indices and supported step types; and
+- structurally valid, bounded protobuf values.
+
+Native installation creates target directories privately, reserves the summary
+ID with `BEGIN IMMEDIATE`, writes the database atomically, and commits the
+summary transaction. If a transaction fails, only newly created files are
+unlinked. Existing sessions are never overwritten.
+
+## Native validation evidence
+
+1. **Synthetic Round-Trip Invariants**: Synthetic multi-turn sessions with tool
+   invocations, results, and thinking events serialize and re-parse with exact
+   fidelity, asserting that thinking text is removed.
+2. **Native Language Server Verification**: The official Go binary
+   (`language_server`) was executed in an isolated sandbox, queried over Connect-RPC
+   (`GetCascadeTrajectorySteps`), and asserted to return all imported steps with
+   identical structure.
+3. **Live User Session Migration**: A live ESPHome voice satellite conversation
+   with 256 steps was migrated from Antigravity CLI to Antigravity Desktop,
+   confirming complete rendering and sidebar searchability.
+
+Run the test suite with:
+
+```console
+uv run pytest -q tests/test_antigravity_desktop_format.py
+```
+
+Run the native language server oracle (macOS with Antigravity Desktop installed):
+
+```console
+uv run pytest -q tests/test_antigravity_desktop_native.py
+```
+
+## Known boundaries
+
+- Native oracle hash validation is pinned to official release builds. Unvalidated
+  binaries can be tested with `SESSION_MIGRATE_UNVALIDATED_DESKTOP_BIN=1`.
+- Generic tool transport is visually render-proven; internal vendor-privileged tools
+  are preserved as generic tool steps to maintain auditability.
+- Private reasoning tokens, system instructions, and ephemeral UI selections are
+  not transferred.
+- Subagent conversations are mapped to independent portable sessions with their
+  parent reference preserved in metadata.
diff --git a/docs/cli-reference.md b/docs/cli-reference.md
@@ -1,6 +1,6 @@
 # CLI reference
 
-This page documents `session-migrate` 0.11.0. `smigrate` is an exact shorthand
+This page documents `session-migrate` 0.12.1. `smigrate` is an exact shorthand
 for the same executable.
 
 ## Commands
@@ -175,7 +175,7 @@ installation still requires the exact pinned version.
 | Grok | `$GROK_HOME`, otherwise `~/.grok` |
 | Kilo Code | official CLI under its normal XDG data root |
 | OpenHands | `$OPENHANDS_CONVERSATIONS_DIR`, otherwise `~/.openhands/conversations` |
-| Hermes Agent | `$HERMES_HOME`, otherwise `~/.hermes` |
+| Hermes Agent | `$HERMES_HOME`, otherwise the CLI's platform default: `%LOCALAPPDATA%\hermes` on Windows, `~/.hermes` elsewhere |
 | MastraCode | `$MASTRA_DB_PATH`; otherwise `$MASTRA_APP_DATA_DIR/mastra.db` or the platform data directory |
 | Devin CLI | `$XDG_DATA_HOME/devin/cli`, otherwise `~/.local/share/devin/cli` on Linux |
 

diff --git a/docs/credential-free-native-testing.md b/docs/credential-free-native-testing.md
@@ -49,7 +49,7 @@ No production credential is read, translated, or written by this workflow.
 | Cursor `2026.03.20-44cb435` | Shipped backend loads blobs and the real TUI renders imported text; no offline model append |
 | Devin 3000.6.7 | Native list/resume selection and ACP `session/load`; stops at vendor authentication |
 | Grok 1.0.5 | OpenAI-compatible override; native creation, reload, TUI replay, and append |
-| Hermes 0.20.6 | OpenAI-compatible override; replay, append, and compaction |
+| Hermes 0.22.2 | OpenAI-compatible override; replay, append, and compaction |
 | Kilo 7.5.0 | Official import/export plus OpenAI-compatible replay and append |
 | Kimi 0.38.0 | OpenAI-compatible override; imported history replays and the reply persists |
 | MastraCode 0.37.1 | OpenAI-compatible override; replay and append |

diff --git a/docs/development.md b/docs/development.md
@@ -39,7 +39,7 @@ pytest and Ruff are development dependencies locked by `uv.lock`.
 | `src/session_migrate/formats/grok.py` | Grok 1.0.5 ACP-update adapter |
 | `src/session_migrate/formats/kilo.py` | Kilo Code 7.5.0 official-bundle adapter |
 | `src/session_migrate/formats/openhands.py` | OpenHands 1.16.0 SDK-event adapter |
-| `src/session_migrate/formats/hermes.py` | Hermes Agent 0.20.6 shared-state adapter |
+| `src/session_migrate/formats/hermes.py` | Hermes Agent 0.22.2 shared-state adapter |
 | `src/session_migrate/formats/mastracode.py` | MastraCode 0.37.1 LibSQL adapter |
 | `src/session_migrate/formats/devin.py` | Devin CLI 3000.6.7 active-forest adapter |
 | `src/session_migrate/formats/common.py` | Shared timestamps, text, and image validation |

diff --git a/docs/format-compatibility.md b/docs/format-compatibility.md
@@ -23,6 +23,7 @@ to separately installed host binaries:
 | OpenCode source and target | `1.17.20` |
 | GitHub Copilot CLI source and target | `1.0.70` |
 | Antigravity CLI source and target | `1.1.16` |
+| Antigravity Desktop source and target | `2.18.1` |
 | Cursor Agent experimental text adapter | `2026.03.20-44cb435` |
 | Mistral Vibe source and target | `2.24.3` |
 | Muse Code source and target | `0.2.1 (0.2.1-R1215.1)` |
@@ -31,7 +32,7 @@ to separately installed host binaries:
 | Grok source and target | `1.0.5` |
 | Kilo Code source and target | `7.5.0` |
 | OpenHands source and target | `1.16.0` (SDK `1.21.0`) |
-| Hermes Agent source and target | `0.20.6` (tag `v2026.8.27`) |
+| Hermes Agent source and target | `0.22.2` (tag `v2026.9.24`, SQLite schema `31`) |
 | MastraCode source and target | `0.37.1` |
 | Devin CLI source and target | `3000.6.7` (`260a97c8`) |