diff --git a/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/check.jsonl b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/check.jsonl
new file mode 100644
index 0000000..3daa397
--- /dev/null
+++ b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/check.jsonl
@@ -0,0 +1,3 @@
+{"file": ".trellis/spec/guides/cross-layer-thinking-guide.md", "reason": "Verify cross-layer numeric type alignment between Flutter Android bridge and SDK core bindings."}
+{"file": ".trellis/spec/guides/code-reuse-thinking-guide.md", "reason": "Check whether repetitive numeric forwarding patterns were fixed consistently and safely."}
+{"file": ".trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/prd.md", "reason": "Validation target for confirmed mismatch fixes and audit coverage."}
diff --git a/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/implement.jsonl b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/implement.jsonl
new file mode 100644
index 0000000..e61ae66
--- /dev/null
+++ b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/implement.jsonl
@@ -0,0 +1,3 @@
+{"file": ".trellis/spec/guides/cross-layer-thinking-guide.md", "reason": "Audit Android Flutter bridge numeric boxing against SDK core signatures across Dart -> MethodChannel -> Java -> gomobile bindings."}
+{"file": ".trellis/spec/guides/code-reuse-thinking-guide.md", "reason": "Look for repeated Android bridge numeric forwarding patterns that should use typed helpers consistently."}
+{"file": ".trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/prd.md", "reason": "Task scope, confirmed crash, signature findings, and acceptance criteria for the Android int/long mismatch audit."}
diff --git a/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/prd.md b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/prd.md
new file mode 100644
index 0000000..59bcf60
--- /dev/null
+++ b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/prd.md
@@ -0,0 +1,74 @@
+# audit android int-long native parameter mismatches against sdk core
+
+## Goal
+
+Audit the Flutter Android bridge managers against the bound SDK core signatures, find places where Flutter `int` values are forwarded with the wrong boxed Java type (`Integer` vs `Long` / `int32`-style expectations), and fix confirmed mismatch risks to prevent more runtime `ClassCastException` failures.
+
+## What I already know
+
+- A real crash was reproduced in `getChannelHistoryMessages` on Android: `java.lang.Integer cannot be cast to java.lang.Long`.
+- The fixed plugin call site was `android/src/main/java/io/openim/flutter_openim_sdk/manager/ChannelManager.java`, where `count` was passed via `value(...)` instead of numeric conversion.
+- Flutter side sends Dart `int` values through `MethodChannel`, which arrive on Android as boxed Java numbers.
+- This repo’s Android bridge currently mixes raw `value(methodCall, key)` and `int2long(methodCall, key)` for numeric parameters.
+- iOS already uses typed accessors like `methodCall[int:]`, `methodCall[int32:]`, `methodCall[int64:]`.
+- SDK core source is available at `/mnt/d/workspace/go/im_dev/openim-sdk-core` for signature comparison.
+- Core signature examples already checked:
+  - `GetChannelHistoryMessages(..., count int, sinceSeq int64)`
+  - `GetChannelMemberList(..., filter int32, offset int32, count int32)`
+  - `GetGroupMemberList(..., filter int32, offset int32, count int32)`
+  - `GetJoinedGroupListPage(..., offset, count int32)`
+  - `GetGroupMemberListByJoinTimeFilter(..., offset int32, count int32, joinTimeBegin int64, joinTimeEnd int64)`
+  - `GetFriendListPage(..., offset int32, count int32, filterBlack bool)`
+  - `GetConversationListSplit(..., offset int, count int)`
+- `gomobile`/`gobind` Java bindings map Go `int` and `int64` to Java `long`, while `int32` maps to Java `int`; this is a common source of cross-platform bridge confusion.
+
+## Assumptions (temporary)
+
+- The Android binding layer should match the generated Java API’s expected boxed types exactly enough to avoid reflection/runtime cast failures.
+- Some existing `value(...)` calls on numeric args are safe when the generated Java signature expects Java `int`/boxed `Integer`, but unsafe when it expects Java `long`/boxed `Long`.
+- The task likely includes both audit and code fixes for confirmed risks, not just reporting.
+
+## Open Questions
+
+- Should this task only fix confirmed Android mismatches found by comparing to SDK core/bound signatures, or also refactor the bridge toward explicit typed helpers (`int32` / `int64`) even for currently-safe call sites?
+
+## Requirements (evolving)
+
+- Compare Android manager numeric forwarding against SDK core signatures and binding behavior.
+- Identify confirmed mismatch sites and distinguish them from safe `int32` call sites.
+- Fix confirmed mismatch sites with minimal behavior change.
+- Summarize findings clearly, including why each changed call needed conversion.
+- If a broader pattern is found, capture it in spec/guides to prevent recurrence.
+
+## Acceptance Criteria (evolving)
+
+- [ ] All Android manager numeric parameters that should be passed as Java `Long` are identified and fixed.
+- [ ] No confirmed `Integer` → `Long` mismatch remains in audited Android manager methods.
+- [ ] Findings are backed by SDK core signature comparison.
+- [ ] Any preventive guidance learned from the audit is written back into `.trellis/spec/`.
+
+## Definition of Done (team quality bar)
+
+- Audit completed across Android managers
+- Code changes applied only where signature comparison justifies them
+- Relevant docs/specs updated if a reusable lesson is found
+- Build/test verification run as feasible for the touched layer
+
+## Out of Scope (explicit)
+
+- Changing SDK core public APIs
+- Large redesign of the plugin dispatch/reflection mechanism unless separately required
+- iOS behavior changes unless needed for parity documentation
+
+## Technical Notes
+
+- Touched/focus paths:
+  - `android/src/main/java/io/openim/flutter_openim_sdk/manager/*.java`
+  - `ios/Classes/Module/*.swift`
+  - `lib/src/manager/*.dart`
+  - `/mnt/d/workspace/go/im_dev/openim-sdk-core/open_im_sdk/*.go`
+- Initial likely-risk buckets:
+  - Go `int` / `int64` parameters exposed to Android as Java `long`
+  - Pagination / cursor params inconsistently forwarded via `value(...)`
+- Confirmed fixed bug:
+  - `ChannelManager.getChannelHistoryMessages`: `count` now uses `int2long(...)`
diff --git a/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/task.json b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/task.json
new file mode 100644
index 0000000..241f03b
--- /dev/null
+++ b/.trellis/tasks/05-12-audit-android-int-long-native-parameter-mismatches-against-sdk-core/task.json
@@ -0,0 +1,26 @@
+{
+  "id": "audit-android-int-long-native-parameter-mismatches-against-sdk-core",
+  "name": "audit-android-int-long-native-parameter-mismatches-against-sdk-core",
+  "title": "audit android int-long native parameter mismatches against sdk core",
+  "description": "",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "gem",
+  "assignee": "gem",
+  "createdAt": "2026-05-12",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}
\ No newline at end of file
diff --git a/android/src/main/java/io/openim/flutter_openim_sdk/manager/ChannelManager.java b/android/src/main/java/io/openim/flutter_openim_sdk/manager/ChannelManager.java
index 58de63c..83db474 100644
--- a/android/src/main/java/io/openim/flutter_openim_sdk/manager/ChannelManager.java
+++ b/android/src/main/java/io/openim/flutter_openim_sdk/manager/ChannelManager.java
@@ -106,7 +106,7 @@ public class ChannelManager extends BaseManager {
                 new OnBaseListener(result, methodCall),
                 value(methodCall, "operationID"),
                 value(methodCall, "channelID"),
-                value(methodCall, "count"),
+                int2long(methodCall, "count"),
                 int2long(methodCall, "sinceSeq")
         );
     }