---
name: sync-upstream
description: >
  Sync the LibreChat Mobile client with a newer official LibreChat server release.
  Diffs upstream tags, identifies gaps in the mobile app, proposes changes with
  user approval, then implements them. Use when a new LibreChat version is released.
allowed-tools: Bash, Read, Glob, Grep, Write, Edit, WebFetch, WebSearch, Agent, TeamCreate, SendMessage, TaskCreate, TaskUpdate, TaskGet, TaskList
argument-hint: "[target-tag] (optional, defaults to latest stable)"
---

# Sync Upstream

Synchronize the LibreChat Mobile app with a newer version of the official LibreChat server.
This is a multi-phase, team-based workflow.

You are the **team lead**. You orchestrate at a high level. You NEVER read code, write code,
or grep the codebase yourself. All heavy lifting is delegated to teammates.

## Team Setup

Create an Agent Team with 5 teammates at the start:

| Teammate | Role | Prompt Summary |
|----------|------|----------------|
| **investigator** | Reads upstream diffs, analyzes API/type/UI changes, cross-references with mobile codebase | "You are the investigator for a LibreChat Mobile upstream sync. Your job is to analyze diffs between upstream tags and identify gaps in the mobile client. You have read-only responsibilities — never write code. You have WebFetch and WebSearch access so you can read GitHub release notes and changelogs in addition to local diffs." |
| **android-expert** | Technical advisor on Android architecture and best practices. Cross-checks all guidance with online research before advising. | "You are the Android tech lead for a LibreChat Mobile upstream sync. You provide guidance on Android best practices, Jetpack Compose patterns, Kotlin idioms, and architectural decisions. CRITICAL: You MUST cross-check your knowledge by researching online (WebSearch/WebFetch) before giving advice. Never rely solely on training data — always verify current best practices, especially for Compose, Ktor, Koin, and Material 3. Return researched guidance to teammates who ask." |
| **ios-kmp-expert** | Technical advisor on iOS and Kotlin Multiplatform architecture. Ensures KMP shared code and iOS-specific implementations follow platform conventions. | "You are the iOS/KMP tech lead for a LibreChat Mobile upstream sync. You provide guidance on Compose Multiplatform patterns, KMP expect/actual declarations, iOS platform APIs (UIKit, Foundation, Keychain, Network.framework), SKIE interop, and ensuring shared code compiles correctly for both targets. CRITICAL: You MUST cross-check your knowledge by researching online (WebSearch/WebFetch) before giving advice. Never rely solely on training data — always verify current best practices for CMP, KMP, and iOS platform conventions. Return researched guidance to teammates who ask." |
| **implementer** | Writes code changes to mobile app following existing patterns and conventions | "You are the implementer for a LibreChat Mobile upstream sync. Your job is to write code changes following existing architecture patterns. Always read the module's CLAUDE.md before touching it. This project uses **Koin** for DI (NOT Hilt) — use `koinViewModel()`, `viewModelOf(::X)`, `singleOf(::X)`, and Koin modules in `feature/*/di/`. Follow safeApiCall, UDF, Ktor, @Serializable patterns. Whenever you touch a KMP module, check BOTH commonMain AND iosMain source sets — expect declarations in commonMain need actual implementations in both androidMain and iosMain. Before making significant architectural decisions, consult the android-expert or ios-kmp-expert teammate." |
| **verifier** | Checks implementation correctness, runs builds, validates changes match proposal | "You are the verifier for a LibreChat Mobile upstream sync. Your job is to independently validate that implementation matches the approved proposal. Run Android build, iOS framework link, detekt, and tests. Review changes file-by-file. Flag issues. Message the implementer directly if fixes are needed — they retain context of what they changed." |

**Teammate interaction pattern:**
- **investigator** works independently on Phase A and B (diff + gap analysis)
- **android-expert** is consulted for Android-specific architecture, Compose, and Material 3 decisions.
  The android-expert MUST search online to verify recommendations — do not accept advice that
  hasn't been cross-checked against current documentation.
- **ios-kmp-expert** is consulted for KMP shared code, expect/actual patterns, iOS platform APIs,
  and Compose Multiplatform concerns. Same online-verification requirement as android-expert.
- **implementer** does all code changes, consulting android-expert or ios-kmp-expert for non-trivial patterns
- **verifier** validates after implementer finishes, messages implementer for fixes

**Important:** Teammates retain context across messages. Reuse them for follow-ups — do NOT
spawn new sub-agents (sub-agents lose context). Sub-agents are a last resort fallback only.

## Prerequisites

Run these checks yourself (lightweight, no codebase reading). The working directory is already
the mobile repo root — do **not** `cd` into a different directory. The local checkout directory
name can vary (historical: `LibreChat-Android`; current upstream: `Librechat-Mobile`), so rely
on relative paths from CWD rather than any hardcoded repo-dir name.

### 1. Submodule check
```bash
git submodule status
```
If `upstream/` is missing:
```bash
git submodule add https://github.com/danny-avila/LibreChat.git upstream
git submodule update --init
```

### 2. Version file check
```bash
cat UPSTREAM_VERSION
```
If missing, create from current state:
```bash
VERSION=$(grep 'SUPPORTED_BACKEND_VERSION' core/common/src/commonMain/kotlin/com/garfiec/librechat/core/common/BackendVersion.kt | grep -o '"[^"]*"' | tr -d '"')
COMMIT=$(cd upstream && git rev-parse HEAD)
echo "# Upstream LibreChat version this mobile build tracks." > UPSTREAM_VERSION
echo "# Updated by the sync-upstream skill. Do not edit manually." >> UPSTREAM_VERSION
echo "tag=v${VERSION}" >> UPSTREAM_VERSION
echo "commit=${COMMIT}" >> UPSTREAM_VERSION
echo "date=$(date +%Y-%m-%d)" >> UPSTREAM_VERSION
```

### 3. Clean working tree
```bash
git status --porcelain
```
If dirty, ask the user to commit or stash before proceeding.

### 4. Context recovery (new session detection)

Check if a prior sync was partially done in another session:
```bash
TRACKED_TAG=$(grep '^tag=' UPSTREAM_VERSION | cut -d= -f2)
CODE_VERSION=$(grep 'SUPPORTED_BACKEND_VERSION' core/common/src/commonMain/kotlin/com/garfiec/librechat/core/common/BackendVersion.kt | grep -o '"[^"]*"' | tr -d '"')
SUBMODULE_HEAD=$(cd upstream && git rev-parse HEAD)
TRACKED_COMMIT=$(grep '^commit=' UPSTREAM_VERSION | cut -d= -f2)
```

If `TRACKED_TAG` (without `v` prefix) != `CODE_VERSION`, or `SUBMODULE_HEAD` != `TRACKED_COMMIT`:
> "It looks like a sync may have been partially done. UPSTREAM_VERSION says {TRACKED_TAG}
> but BackendVersion.kt says {CODE_VERSION}. Should I treat the higher version as the
> current baseline, or would you like to investigate?"

Wait for user response before continuing.

Also check for existing artifacts from a previous partial run:
```bash
ls -la .claude/sync-upstream/artifacts/ 2>/dev/null
```
If a previous proposal or phase report exists, offer to resume from that state.

### 5. Prepare artifact directory

```bash
mkdir -p .claude/sync-upstream/artifacts
```
All phase outputs (diff summaries, gap reports, proposals) are persisted here so the skill
is resumable if the session is compacted or dies mid-run.

---

## Phase A: Diff Analysis

**Delegate to: investigator**

### A1. Assign investigation task

Create a task for the investigator with this prompt:

> Analyze upstream changes for a version sync. **Persist all outputs to files under
> `.claude/sync-upstream/artifacts/` as you go** so the team lead can recover state if
> the session is compacted.
>
> 1. Read `UPSTREAM_VERSION` at the repo root to get the current tracked tag and commit.
> 2. Fetch latest tags: `cd upstream && git fetch --tags origin`
> 3. List all tags newer than the current tracked tag:
>    `cd upstream && git tag --sort=-v:refname`
>    Filter OUT any tags containing `-rc`, `-beta`, `-alpha`.
> 4. **Read GitHub release notes for every stable tag** between the current tracked tag and
>    the target tag (inclusive). Release notes almost always flag breaking changes that
>    diffs hide. For each tag:
>    ```bash
>    gh api repos/danny-avila/LibreChat/releases/tags/{tag} --jq .body
>    ```
>    Fall back to `WebFetch` on `https://github.com/danny-avila/LibreChat/releases/tag/{tag}`
>    if `gh` is unavailable. Also scan commit messages:
>    `cd upstream && git log --oneline {current_tag}..{target_tag}` — commit subjects
>    from upstream maintainers are often the most candid description of what broke.
> 5. Generate diffs between the current tag and {target_tag} for all paths listed in
>    `${CLAUDE_SKILL_DIR}/reference/upstream-paths.md`. Use `--stat` for an overview,
>    then request per-path file-level diffs for anything non-trivial. Paths include:
>    - `api/server/routes/` (including `routes/agents/`, `routes/files/`, `routes/admin/`)
>    - `api/server/controllers/`, `api/server/middleware/`, `api/server/services/`
>    - `api/models/` (Mongoose models that shape API responses)
>    - `packages/data-provider/src/` — especially `api-endpoints.ts`, `config.ts`,
>      `data-service.ts`, `parsers.ts`, `permissions.ts`, `types/`, `react-query/`
>    - `packages/data-schemas/src/`
>    - `packages/api/src/` (newer workspace introduced recently)
>    - `client/src/components/`, `client/src/hooks/`, `client/src/data-provider/`,
>      `client/src/store/`, `client/src/Providers/`
>    - `librechat.example.yaml`, `.env.example` (server config schema — affects `/api/config` surface)
> 6. Categorize every change into exactly one of:
>    - **API changes**: New or modified routes, controller logic
>    - **Removed/deprecated endpoints**: Routes or fields that were removed or deprecated (BREAK mobile hard — cannot be deferred)
>    - **Type/schema changes**: New or modified data types, request/response shapes
>    - **New config / feature flags**: New keys in `/api/config` response that gate UI
>    - **UI changes**: New components, modified user flows
>    - **Security fixes**: CVEs, auth changes, token handling — cannot be deferred
>    - **Bug fixes**: Non-security fixes that may need mobile equivalents
>    - **Infrastructure**: Build, config, deps (usually not relevant)
> 7. Write the categorized summary to
>    `.claude/sync-upstream/artifacts/phase-a-diff-summary.md` and report a short
>    version back. Include representative file paths and release-note excerpts.

If `$ARGUMENTS` was provided, use it as the target tag.

### A2. Present results to user

Once investigator reports back:
- If no newer tags exist, tell user "Already up to date with {current_tag}" and stop.
- If no `$ARGUMENTS`, present the list of available tags and ask user to pick one (default: latest stable).
- Show the investigator's categorized summary.

**Done when:** User has seen the diff summary and confirmed the target tag. The file
`.claude/sync-upstream/artifacts/phase-a-diff-summary.md` exists.

---

## Phase B: Gap Analysis

**Delegate to: investigator** (reuses context from Phase A — do NOT spawn a new agent)

### B1. Send follow-up to investigator

> Now cross-reference the upstream changes you found with the mobile codebase.
> Persist the gap report to `.claude/sync-upstream/artifacts/phase-b-gap-report.md`.
>
> 1. Read these mapping files from `${CLAUDE_SKILL_DIR}/reference/`:
>    - `api-mapping.md` — official routes to mobile `*Api.kt` files
>    - `model-mapping.md` — official TS types to Kotlin data classes
>    - `ui-mapping.md` — web components to mobile feature modules
> 2. Read `DISCOVERY.md` at the repo root — it catalogs already-discovered backend
>    endpoints and their quirks. Any new endpoints must be appended there by the
>    implementer in Phase D.
> 3. For each **API change**:
>    - Grep `core/network/src/commonMain/` for the corresponding endpoint (`*Api.kt` files)
>    - Also grep `core/data/src/commonMain/` — some repositories inline endpoint paths
>    - Note: exists / needs updating / missing
> 4. For each **removed / deprecated endpoint**:
>    - Find every mobile call site and flag it as a Breaking gap
> 5. For each **type / schema change**:
>    - Check `core/model/src/commonMain/` for the matching Kotlin data class
>    - Note new, removed, or type-changed fields
>    - **SSE-specific**: when upstream modifies streaming payloads or run events, also
>      check `core/model/src/.../StreamEvent.kt`, `SseContentEvent.kt`, `ToolCallRecord.kt`,
>      `ToolCallResult.kt`, `ToolAuthStatus.kt`. SSE shape drift is a frequent source of
>      silent breakage that compiles but produces wrong UI at runtime.
> 6. For each **UI change**:
>    - Check the corresponding `feature/*/` module (commonMain + platform sources)
>    - Note if the feature exists, needs updating, or is missing
> 7. For each **new feature flag in `/api/config`**:
>    - Check `core/model/src/commonMain/.../StartupConfig.kt` — new keys must be added
>      for the mobile app to detect the flag and gate UI accordingly
> 8. **Version-gating check.** Read `core/common/src/commonMain/.../BackendVersion.kt`.
>    It exposes `parse()`, `isCompatible()`, and `extractVersionFromFooter()`. For any
>    new upstream feature that requires the target tag or higher, flag it so the
>    implementer adds a `BackendVersion.isCompatible(...)` check on the mobile side.
> 9. **iosMain coverage check.** For every touched module under `core/*` or `feature/*`,
>    confirm whether `src/iosMain/kotlin/...` sources exist. If they do, the implementer
>    must update both commonMain AND iosMain (expect/actual pairs, platform-specific
>    bridges like `NWConnection` SSE transport, Keychain, etc.). Flag modules where
>    iosMain parity is easily missed.
> 10. Categorize all gaps:
>     - **Breaking** (must fix): Changed or removed request/response shapes, removed/renamed
>       endpoints, auth changes, security fixes
>     - **Additive** (new feature): New endpoints, new UI features, new optional fields,
>       new feature flags
>     - **Cosmetic** (polish): UI improvements, a11y, i18n
> 11. Report the categorized gap list with specific file paths for both upstream and mobile.

### B2. Receive gap report

The investigator now has full context of both the upstream diff AND the mobile gaps.
Keep the investigator alive for follow-up questions during Phase C.

**Done when:** You have the categorized gap list, and
`.claude/sync-upstream/artifacts/phase-b-gap-report.md` exists on disk.

---

## Phase C: Proposal

**Lead presents to user — no delegation needed.**

Take the investigator's gap report and produce a structured proposal.
**Persist the proposal to `.claude/sync-upstream/artifacts/proposal-{target_tag}.md`
before presenting it** so the user has a reviewable artifact and the skill can
resume if the session dies.

```
## Sync Proposal: {current_tag} → {target_tag}

### Breaking Changes ({count}) — must fix before updating version
For each: what changed upstream (file reference), mobile file(s) needing updates, proposed change.

### Security Fixes ({count}) — must fix, cannot be deferred
For each: CVE / patch description, mobile-side impact (if any), proposed change.

### Removed / Deprecated Endpoints ({count}) — mobile call sites must migrate
For each: removed/deprecated route, mobile call sites (file paths), replacement route and migration plan.

### New Features ({count}) — recommended
For each: what was added upstream, proposed mobile implementation approach, affected modules.

### New Config / Feature Flags ({count})
For each: new key in `/api/config`, proposed `StartupConfig.kt` update, whether a `BackendVersion` gate is needed.

### UI Changes Needing User Input ({count})
For each: what the web app does (file reference), why it doesn't translate directly to Compose, 2-3 concrete options.

### Deferred Items ({count}) — can wait for a future sync
Items that are low priority or require significant new infrastructure.
```

### Consult experts on non-trivial items

Before presenting to the user, for any proposed change that involves:
- New architectural patterns (new module, new DI scope, new navigation key)
- UI patterns without an existing equivalent in the codebase
- Performance-sensitive changes (list rendering, image loading, SSE throughput)
- KMP shared code or expect/actual patterns
- iOS-specific bridges (Network.framework, Keychain, WKWebView)

Send Android-specific items to **android-expert** and KMP/iOS items to **ios-kmp-expert**:

> Review these proposed mobile changes for best practices. For each item,
> research online to verify the recommended approach is current (especially
> for Compose, Material 3, Koin, Ktor, CMP, and iOS platform APIs). Flag any
> items where modern best practices differ from what we're proposing.
> {list of non-trivial items}

Incorporate the experts' feedback into the proposal **and update the artifact file** before showing the user.

### Approval gate

Ask the user:

> Review the proposal above (also saved at `.claude/sync-upstream/artifacts/proposal-{target_tag}.md`).
> Reply with:
> - **approve all** — proceed with full implementation
> - **approve with changes** — tell me what to modify in the proposal
> - **approve partial** — list which items to implement now (rest deferred)
> - **cancel** — abort, no changes made

**Do NOT proceed to Phase D until the user explicitly approves.**

If the user requests changes, update the proposal file AND re-present.

---

## Phase D: Implementation

**Delegate to: implementer, then verifier**

### D1. Assign implementation task

Create a task for the implementer with the approved change list:

> Implement the following approved changes for the upstream sync from {current_tag} to {target_tag}.
>
> **Before touching any module:**
> 1. Read the root `CLAUDE.md` for architecture rules
> 2. Read `${CLAUDE_SKILL_DIR}/reference/android-architecture.md` for patterns
> 3. Read the specific module's `CLAUDE.md` (e.g., `core/network/CLAUDE.md`)
> 4. Read existing similar code as a pattern reference
>
> **Conventions (THIS PROJECT USES KOIN, NOT HILT):**
> - `safeApiCall` for all network calls in repositories
> - **Koin** for DI — use `viewModelOf(::X)`, `singleOf(::X)`, `factoryOf(::X)` in Koin modules at `feature/*/di/` and `core/*/di/`. Register the module in `LibreChatApplication.kt`'s `startKoin { modules(...) }` when creating a new one.
> - Use `koinViewModel()` in Composables — never `hiltViewModel()` or `@HiltViewModel`.
> - Unidirectional data flow: UI → ViewModel → Repository → API/Room
> - `@Serializable` data classes in `core/model/`
> - Ktor client patterns in `core/network/`
> - For KMP modules, update BOTH `src/commonMain/` AND `src/iosMain/` (and `src/androidMain/` when relevant). `expect` declarations in commonMain REQUIRE matching `actual` implementations in every target's source set.
>
> **Before making non-trivial architectural decisions** (new patterns, new modules,
> complex UI components), message the **android-expert** or **ios-kmp-expert** teammate.
> They will research current best practices online and advise.
>
> **Approved changes:**
> {paste the approved change list here}
>
> **After all code changes:**
> 1. Update `SUPPORTED_BACKEND_VERSION` in `core/common/src/commonMain/kotlin/com/garfiec/librechat/core/common/BackendVersion.kt` to "{new_version}" (without `v` prefix)
> 2. Advance submodule: `cd upstream && git checkout {target_tag}`
> 3. Update `UPSTREAM_VERSION` at repo root:
>    ```
>    tag={target_tag}
>    commit={full SHA of target_tag}
>    date={today's date YYYY-MM-DD}
>    ```
> 4. Update `DISCOVERY.md` at the repo root: append newly-discovered endpoints, removed
>    endpoints, and revised response shapes. Keep it accurate — future syncs depend on it.
> 5. Report back the full list of files created or modified, grouped by module.

### D2. Assign verification task

After implementer reports done, create a task for the verifier:

> Verify the upstream sync implementation from {current_tag} to {target_tag}.
>
> **Build verification (run all four):**
> 1. `./gradlew assembleDebug` — Android app compiles
> 2. `./gradlew detekt` — static analysis passes on ALL source sets (commonMain,
>    androidMain, iosMain). The CI gate currently only covers commonMain, so do
>    not rely on CI here. If failures are found in iosMain/androidMain, report them.
> 3. `./gradlew :shared:linkDebugFrameworkIosSimulatorArm64` — iOS framework links.
>    This catches iosMain compile errors that `assembleDebug` silently skips.
> 4. `./gradlew check` — unit tests pass for touched modules
>
> **Correctness review:**
> 5. Read the approved proposal at `.claude/sync-upstream/artifacts/proposal-{target_tag}.md`.
> 6. Review every file the implementer changed:
>    - All approved items implemented?
>    - Any unapproved changes (scope creep)?
>    - Koin DI used (not Hilt / `@Inject`)?
>    - `safeApiCall` wrapping new network calls?
>    - For KMP modules: did the implementer touch iosMain where needed, not just commonMain?
>    - For new endpoints: was `DISCOVERY.md` updated?
>
> **Version consistency:**
> 7. `SUPPORTED_BACKEND_VERSION` in `core/common/src/commonMain/.../BackendVersion.kt` matches target
> 8. `UPSTREAM_VERSION` file has correct tag, commit, date
> 9. Submodule is at the correct tag: `cd upstream && git describe --tags`
> 10. `DISCOVERY.md` reflects endpoint additions/removals
>
> **If you find issues**, message the **implementer** directly to fix them.
> The implementer retains context of what it changed.
>
> **Report back:**
> - Pass/fail for each of the four build commands + any errors
> - Issues found (if any) and who fixed them
> - List of user-testable behaviors to verify on device — separate lists for Android and iOS where applicable

### D3. Present results to user

Once verifier confirms everything passes:

```
## Sync Complete: {current_tag} → {target_tag}

### Files Changed
{grouped by module}

### What to Test
{Android behaviors}
{iOS behaviors}

### How to Test
1. Build: `./gradlew assembleDebug` (Android), `./gradlew :shared:linkDebugFrameworkIosSimulatorArm64` (iOS)
2. Install on device/emulator (both platforms where relevant)
3. Test each behavior listed above

### Version Updates
- SUPPORTED_BACKEND_VERSION: {old} → {new}
- UPSTREAM_VERSION tag: {old_tag} → {new_tag}
- Submodule: pinned to {target_tag}
- DISCOVERY.md: {brief summary of what was appended}

### Artifacts
Proposal and phase reports saved under `.claude/sync-upstream/artifacts/`.
```

---

## Error Recovery

| Situation | Recovery |
|-----------|----------|
| Submodule missing | `git submodule add https://github.com/danny-avila/LibreChat.git upstream` |
| `UPSTREAM_VERSION` missing | Create from `SUPPORTED_BACKEND_VERSION` + submodule HEAD |
| No newer tags | Report "up to date" and stop |
| Dirty working tree | Ask user to commit/stash |
| Git fetch fails | Show `git remote -v`, check network |
| Android build fails after changes | Verifier messages implementer to fix (both retain context) |
| iOS framework link fails (but Android passes) | Implementer likely forgot iosMain updates — message them to audit iosMain source sets for affected modules |
| Detekt fails (any source set) | Implementer fixes findings. Do not use `--ignore-failures`. |
| User cancels at Phase C | Delete or archive the proposal artifact, tear down the team (`TeamDelete`), stop cleanly |
| Version mismatch (tracked tag ≠ BackendVersion.kt) | Ask user which is the true baseline |
| Session compacted mid-run | List `.claude/sync-upstream/artifacts/` — newest file indicates phase reached; resume from there |
| Teammate unresponsive | Check task status, re-send message; sub-agent as last resort |