diff --git a/.project-docs/30-worklog/tasks/20260831-check-list-import-attachments-c4a91f2b.md b/.project-docs/30-worklog/tasks/20260831-check-list-import-attachments-c4a91f2b.md
new file mode 100644
index 0000000..23fc9f8
--- /dev/null
+++ b/.project-docs/30-worklog/tasks/20260831-check-list-import-attachments-c4a91f2b.md
@@ -0,0 +1,44 @@
+# Task: Check list import unrelated attachment behavior
+
+## Identity
+
+- Task ID: 20260831-check-list-import-attachments-c4a91f2b
+- Mode: Feature
+- Branch: codex/20260831-check-list-import-attachments-c4a91f2b-check-list-import-attachments-c4a91f2b
+- Worktree: /Users/inmanx/Documents/lwltAPI-worktrees/20260831-check-list-import-attachments-c4a91f2b
+- Base commit: 416d7e8869bb5ea789f7a0c265d87e4c63a294e5
+- Owner: codex
+- Status: Ready for integration
+
+## Scope
+
+- Read the active passenger-list import registry, Skill contracts, attachment normalizer, task-state transitions, AgentBus reply flow, platform attachment UI, and focused tests.
+- Determine whether an unrelated attachment produces a user-visible prompt in the manual platform and AgentBus/WeChat paths.
+- Do not change product behavior, access a live runtime, deploy, restart, or read secrets.
+
+## Intent And Constraints
+
+- This is a read-only behavior inspection against current committed `main` source at base commit `416d7e8869bb5ea789f7a0c265d87e4c63a294e5`.
+- Treat “unrelated attachment” as both an unsupported file type/count/metadata case and a nominal `.xls`/`.xlsx` whose workbook content does not match the roster template.
+- Report channel differences explicitly; do not infer live deployment state from repository source.
+
+## Outcome
+
+- The manual platform visibly rejects a non-`.xls`/`.xlsx` selection and displays the task service's rejection message when an Excel workbook fails roster normalization. The task remains `awaiting_attachment` so a corrected workbook can be sent.
+- AgentBus/WeChat immediately returns a failed result for multiple attachments, unsupported extensions, missing attachment metadata, and other pre-ingestion `InputAttachmentError` cases; the original roster task is not advanced.
+- A valid-extension Excel workbook with unrelated/invalid roster content is normalized and rejected correctly, and the task message/event is updated to `名单附件校验未通过【<code>】，请按模板修正后重新发送。` while remaining `awaiting_attachment`.
+- Current AgentBus delivery logic does not immediately return that workbook-rejection message: `processInboundTask` ignores `result.input_attachment`, and durable finalization excludes `awaiting_attachment`. In the non-durable path, `awaiting_attachment` is also non-final, so the specific rejection is not emitted as the immediate result. This is a channel reply gap, not a validation gap.
+
+## Verification
+
+- Static inspection: `agent设计规范/business-adaptation-registry.md`, `agent设计规范/skills/lwlt-lifecycle/`, `control-plane/src/input-attachment.ts`, `control-plane/src/passenger-roster-workbook.ts`, `control-plane/src/task-service.ts`, `control-plane/src/agentbus.ts`, and `LianSyn-platform/app.js`.
+- Passed: bundled Node.js `--test LianSyn-platform/app-roster-attachment.test.mjs` (4/4).
+- Attempted focused TypeScript tests, but the isolated worktree has no `node_modules` and neither the bundled runtime nor workspace provides `tsx`; test loading failed before any test executed. No business test failed.
+
+## Follow-ups
+
+- If requested, add an AgentBus/WeChat immediate result for rejected roster workbooks while preserving the original task in `awaiting_attachment`, plus durable and legacy listener coverage.
+
+## Promotion Candidates
+
+- None recorded.