diff --git a/TOOLS.md b/TOOLS.md
index 4a036dd..9143865 100644
--- a/TOOLS.md
+++ b/TOOLS.md
@@ -105,23 +105,29 @@ agent-browser close
 **目录**: `~/.openclaw/workspace/skills/calendar/`
 **默认发件人**: youlu@luyanxin.com
 **默认时区**: America/Los_Angeles
-**日历数据**: `~/.openclaw/workspace/calendars/home/`（事件）、`calendars/tasks/`（待办）
+**日历数据**: `~/.openclaw/workspace/calendars/home/`（事件）、`calendars/tasks/`（待办）、`contacts/default/`（通讯录）
 **运行方式**: `uv run`（依赖 `icalendar` 库）
 
 **核心用法**:
 ```bash
 SKILL_DIR=~/.openclaw/workspace/skills/calendar
 
-# 发送日历邀请（--from 默认 youlu@luyanxin.com）
+# 通讯录管理（send 命令会校验收件人必须在通讯录中）
+$SKILL_DIR/scripts/calendar.sh contact list
+$SKILL_DIR/scripts/calendar.sh contact add --name "小橘子" --email "Erica.Jiang@anderson.ucla.edu" --type work
+$SKILL_DIR/scripts/calendar.sh contact add --name "小橘子" --email "xueweijiang0313@gmail.com" --type home
+$SKILL_DIR/scripts/calendar.sh contact delete --name "小橘子"
+
+# 发送日历邀请（--to 用通讯录名称，不要直接写邮箱地址）
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "friend@example.com" \
+  --to "小橘子:work" \
   --subject "Lunch" --summary "Lunch at Tartine" \
   --start "2026-03-20T12:00:00" --end "2026-03-20T13:00:00" \
   --alarm 1h  # 提前1小时提醒（默认1d，支持 1d/2h/30m）
 
 # 发送周期性邀请（--start 必须落在 BYDAY 指定的那天！）
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "alice@example.com" \
+  --to "小橘子:work" \
   --subject "Weekly Shot" --summary "Allergy Shot (Tue)" \
   --start "2026-03-31T14:30:00" --end "2026-03-31T15:00:00" \
   --rrule "FREQ=WEEKLY;COUNT=13;BYDAY=TU"
@@ -148,12 +154,14 @@ $SKILL_DIR/scripts/calendar.sh todo delete --match "报销"
 $SKILL_DIR/scripts/calendar.sh todo check    # 每日摘要（cron）
 ```
 
-**支持操作**: 发送邀请 (`send`)、接受/拒绝/暂定 (`reply`)、事件管理 (`event list/delete --date/--all`)、待办管理 (`todo add/list/edit/complete/delete/check`)
+**支持操作**: 通讯录 (`contact list/add/delete`)、发送邀请 (`send`)、接受/拒绝/暂定 (`reply`)、事件管理 (`event list/delete --date/--all`)、待办管理 (`todo add/list/edit/complete/delete/check`)
 **依赖**: himalaya（邮件）、vdirsyncer（CalDAV 同步）、khal（查看日历）、todoman（待办管理）
 **同步**: 发送/回复/待办变更后自动 `vdirsyncer sync`，心跳也会定期同步
 **注意**: 发送日历邀请属于对外邮件，需先确认
 
 **安全规则**:
+- **`send --to` 只接受通讯录中的联系人**，不认识的地址会被拒绝（防止地址幻觉）
+- **添加联系人和发送邮件是独立操作**，不要在同一次请求中先 add 再 send
 - 周期性邀请务必先 `--dry-run` 验证 ICS 内容
 - **绝不用 `rm` 删日历 .ics 文件**，只用 `event delete`
 - **取消周期性事件的单次用 `--date`**，不要用 `--all`（会删掉整个系列）
diff --git a/skills/calendar/SKILL.md b/skills/calendar/SKILL.md
index 559498e..81fea0d 100644
--- a/skills/calendar/SKILL.md
+++ b/skills/calendar/SKILL.md
@@ -20,7 +20,16 @@ See `TESTING.md` for dry-run and live test steps, verification checklists, and t
 - `khal` for reading calendar (optional but recommended)
 - Runs via `uv run` (dependencies managed in `pyproject.toml`)
 
-## Important: Email Sending Rules
+## Important: Recipient Validation
+
+The `send` command **only accepts recipients that exist in the contacts list**. This prevents hallucinated email addresses.
+
+- `--to "小橘子:work"` — resolves contact name + email type
+- `--to "小橘子"` — resolves by name (errors if contact has multiple emails)
+- `--to "user@example.com"` — accepted only if the email exists in contacts
+- Unknown addresses are **rejected** with the available contacts list shown
+
+**Adding contacts and sending invites are separate operations.** Do not add a contact and send to it in the same request — contact additions should be a deliberate, user-initiated action.
 
 Calendar invites are outbound emails. Follow the workspace email rules:
 - **youlu@luyanxin.com -> mail@luyx.org**: send directly, no confirmation needed
@@ -43,6 +52,11 @@ $SKILL_DIR/scripts/calendar.sh reply [options]
 $SKILL_DIR/scripts/calendar.sh event list [options]
 $SKILL_DIR/scripts/calendar.sh event delete [options]
 
+# Manage contacts (used for recipient validation)
+$SKILL_DIR/scripts/calendar.sh contact list
+$SKILL_DIR/scripts/calendar.sh contact add [options]
+$SKILL_DIR/scripts/calendar.sh contact delete [options]
+
 # Manage todos
 $SKILL_DIR/scripts/calendar.sh todo add [options]
 $SKILL_DIR/scripts/calendar.sh todo list [options]
@@ -57,8 +71,9 @@ $SKILL_DIR/scripts/calendar.sh todo check
 ## Sending Invites
 
 ```bash
+# --to accepts contact names (resolved via contacts list)
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "friend@example.com" \
+  --to "小橘子:work" \
   --subject "Lunch on Friday" \
   --summary "Lunch at Tartine" \
   --start "2026-03-20T12:00:00" \
@@ -71,7 +86,7 @@ $SKILL_DIR/scripts/calendar.sh send \
 
 | Flag            | Required | Description                                    |
 |-----------------|----------|------------------------------------------------|
-| `--to`          | Yes      | Recipient(s), comma-separated                  |
+| `--to`          | Yes      | Recipient(s) — contact name, name:type, or known email |
 | `--subject`     | Yes      | Email subject line                             |
 | `--summary`     | Yes      | Event title (shown on calendar)                |
 | `--start`       | Yes      | Start time, ISO 8601 (`2026-03-20T14:00:00`)   |
@@ -182,6 +197,42 @@ $SKILL_DIR/scripts/calendar.sh event delete --match "Allergy Shot" --all
 
 ---
 
+## Managing Contacts
+
+Contacts are stored as vCard (.vcf) files in `~/.openclaw/workspace/contacts/default/` and synced to Migadu CardDAV via vdirsyncer. The `send` command validates recipients against this contact list.
+
+```bash
+# List all contacts
+$SKILL_DIR/scripts/calendar.sh contact list
+
+# Add a contact (single email)
+$SKILL_DIR/scripts/calendar.sh contact add --name "小鹿" --email "mail@luyx.org"
+
+# Add with email type and nickname
+$SKILL_DIR/scripts/calendar.sh contact add --name "小橘子" --email "Erica.Jiang@anderson.ucla.edu" --type work --nickname "小橘子"
+
+# Add a second email to an existing contact
+$SKILL_DIR/scripts/calendar.sh contact add --name "小橘子" --email "xueweijiang0313@gmail.com" --type home
+
+# Delete a contact
+$SKILL_DIR/scripts/calendar.sh contact delete --name "小橘子"
+```
+
+### Sending to Contacts
+
+```bash
+# By name (works when contact has a single email)
+$SKILL_DIR/scripts/calendar.sh send --to "小鹿" ...
+
+# By name + type (required when contact has multiple emails)
+$SKILL_DIR/scripts/calendar.sh send --to "小橘子:work" ...
+
+# By raw email (must exist in contacts)
+$SKILL_DIR/scripts/calendar.sh send --to "Erica.Jiang@anderson.ucla.edu" ...
+```
+
+---
+
 ## Replying to Invites
 
 ```bash
diff --git a/skills/calendar/TESTING.md b/skills/calendar/TESTING.md
index a21af78..de25e0a 100644
--- a/skills/calendar/TESTING.md
+++ b/skills/calendar/TESTING.md
@@ -1,6 +1,8 @@
 # Testing the Calendar Skill
 
-End-to-end tests for send, reply, todo, calendar sync, and local calendar. All commands use `--dry-run` first, then live.
+End-to-end tests for contacts, send, reply, todo, calendar sync, and local calendar. All commands use `--dry-run` first, then live.
+
+**Important**: Tests 1-3 (contacts) must run first — `send` requires recipients to be in the contacts list.
 
 ```bash
 SKILL_DIR=~/.openclaw/workspace/skills/calendar
@@ -11,7 +13,118 @@ TEST_DATE=$(date -d "+3 days" +%Y-%m-%d)
 
 ---
 
-## 1. Dry Run: Send Invite
+## 1. Contact Add and List
+
+Set up test contacts needed for send tests.
+
+```bash
+# Add a contact with a single email
+$SKILL_DIR/scripts/calendar.sh contact add --name "测试用户" --email "mail@luyx.org"
+
+# List contacts
+$SKILL_DIR/scripts/calendar.sh contact list
+
+# Add a contact with typed email and nickname
+$SKILL_DIR/scripts/calendar.sh contact add --name "测试多邮箱" --email "work@example.com" --type work --nickname "多邮箱"
+
+# Add a second email to the same contact
+$SKILL_DIR/scripts/calendar.sh contact add --name "测试多邮箱" --email "home@example.com" --type home
+
+# List again — should show both emails
+$SKILL_DIR/scripts/calendar.sh contact list
+```
+
+**Verify:**
+- [ ] `contact add` prints "Added contact: ..."
+- [ ] Second `contact add` prints "Updated contact: ... — added ..."
+- [ ] `contact list` shows all contacts with email types
+- [ ] `.vcf` files created in `~/.openclaw/workspace/contacts/default/`
+
+## 2. Recipient Resolution (Send Validation)
+
+Test that `send --to` correctly resolves contacts and rejects unknown addresses.
+
+```bash
+# Name resolves (single email contact) — should work
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "测试用户" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Name:type resolves — should work
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "测试多邮箱:work" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Nickname resolves — should work
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "多邮箱:home" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Known raw email resolves — should work
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "mail@luyx.org" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Unknown email REJECTED — should FAIL
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "xiaojuzi@meta.com" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Multi-email without type REJECTED — should FAIL (ambiguous)
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "测试多邮箱" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+
+# Unknown name REJECTED — should FAIL
+$SKILL_DIR/scripts/calendar.sh send \
+  --to "不存在的人" \
+  --subject "Resolve Test" --summary "Resolve Test" \
+  --start "${TEST_DATE}T15:00:00" --end "${TEST_DATE}T16:00:00" \
+  --dry-run
+```
+
+**Verify:**
+- [ ] First 4 commands succeed (show ICS output)
+- [ ] Unknown email fails with "not found in contacts" + available contacts list
+- [ ] Multi-email without type fails with "has multiple emails. Specify type"
+- [ ] Unknown name fails with "not found" + available contacts list
+
+## 3. Contact Delete
+
+```bash
+# Delete the multi-email test contact
+$SKILL_DIR/scripts/calendar.sh contact delete --name "测试多邮箱"
+
+# Verify it's gone
+$SKILL_DIR/scripts/calendar.sh contact list
+
+# Delete by nickname — should fail (contact already deleted)
+$SKILL_DIR/scripts/calendar.sh contact delete --name "多邮箱"
+```
+
+**Verify:**
+- [ ] Delete prints "Deleted contact: 测试多邮箱"
+- [ ] `contact list` no longer shows that contact
+- [ ] Second delete fails with "No contact matching"
+- [ ] `.vcf` file removed from contacts dir
+
+---
+
+## 4. Dry Run: Send Invite
+
+**Prerequisite**: "测试用户" contact from test 1 must exist.
 
 Generates the ICS and MIME email without sending. Check that:
 - ICS has `METHOD:REQUEST`
@@ -23,7 +136,7 @@ Generates the ICS and MIME email without sending. Check that:
 ```bash
 # Default alarm (1 day before)
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Test Invite" \
   --summary "Test Event" \
   --start "${TEST_DATE}T15:00:00" \
@@ -32,7 +145,7 @@ $SKILL_DIR/scripts/calendar.sh send \
 
 # Custom alarm (1 hour before)
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Test Invite (1h alarm)" \
   --summary "Test Event (1h alarm)" \
   --start "${TEST_DATE}T15:00:00" \
@@ -41,13 +154,13 @@ $SKILL_DIR/scripts/calendar.sh send \
   --dry-run
 ```
 
-## 2. Live Send: Self-Invite
+## 5. Live Send: Self-Invite
 
 Send a real invite to `mail@luyx.org` only (no confirmation needed per email rules).
 
 ```bash
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Calendar Skill Test" \
   --summary "Calendar Skill Test" \
   --start "${TEST_DATE}T15:00:00" \
@@ -61,7 +174,7 @@ $SKILL_DIR/scripts/calendar.sh send \
 - [ ] Email shows Accept/Decline/Tentative buttons (not just an attachment)
 - [ ] `.ics` file saved to `~/.openclaw/workspace/calendars/home/`
 
-## 3. Verify Calendar Sync and Local Calendar
+## 6. Verify Calendar Sync and Local Calendar
 
 After sending in step 2, check that the event synced and appears locally.
 
@@ -82,7 +195,7 @@ khal list "$TEST_DATE"
 - [ ] `.ics` file exists in `~/.openclaw/workspace/calendars/home/`
 - [ ] `khal list` shows "Calendar Skill Test" on the test date
 
-## 4. Reply: Accept the Self-Invite
+## 7. Reply: Accept the Self-Invite
 
 The invite sent in step 2 should be in the inbox. Find it, then accept it. This tests the full reply flow without needing an external sender.
 
@@ -105,14 +218,14 @@ $SKILL_DIR/scripts/calendar.sh reply \
 - [ ] `vdirsyncer sync` ran
 - [ ] `khal list "$TEST_DATE"` still shows the event
 
-## 5. Reply: Decline an Invite
+## 8. Reply: Decline an Invite
 
 Send another self-invite, then decline it. This verifies decline removes the event from local calendar.
 
 ```bash
 # Send a second test invite
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Decline Test" \
   --summary "Decline Test Event" \
   --start "${TEST_DATE}T17:00:00" \
@@ -133,7 +246,7 @@ $SKILL_DIR/scripts/calendar.sh reply \
 - [ ] Event removed from local calendar
 - [ ] `khal list "$TEST_DATE"` does NOT show "Decline Test Event"
 
-## 6. Verify Final Calendar State
+## 9. Verify Final Calendar State
 
 After all tests, confirm the calendar is in a clean state.
 
@@ -150,7 +263,7 @@ khal list today 7d
 
 ---
 
-## 7. Dry Run: Add Todo
+## 10. Dry Run: Add Todo
 
 Generates the VTODO ICS without saving. Check that:
 - ICS has `BEGIN:VTODO`
@@ -166,7 +279,7 @@ $SKILL_DIR/scripts/calendar.sh todo add \
   --dry-run
 ```
 
-## 8. Live Add: Create a Todo
+## 11. Live Add: Create a Todo
 
 ```bash
 $SKILL_DIR/scripts/calendar.sh todo add \
@@ -182,7 +295,7 @@ $SKILL_DIR/scripts/calendar.sh todo add \
 - [ ] `todo list` (todoman directly) shows "Test Todo"
 - [ ] `vdirsyncer sync` ran
 
-## 9. List Todos
+## 12. List Todos
 
 ```bash
 # Via our wrapper (formatted Chinese output)
@@ -200,7 +313,7 @@ $SKILL_DIR/scripts/calendar.sh todo list --all
 - [ ] Priority grouping is correct in wrapper output
 - [ ] `--all` flag works (same output when none are completed)
 
-## 10. Edit a Todo
+## 13. Edit a Todo
 
 Change the due date and priority of the test todo from step 8.
 
@@ -248,7 +361,7 @@ $SKILL_DIR/scripts/calendar.sh todo edit --match "Test Todo"
 # Should print "Nothing to change" message
 ```
 
-## 11. Complete a Todo
+## 14. Complete a Todo
 
 ```bash
 $SKILL_DIR/scripts/calendar.sh todo complete --match "Test Todo"
@@ -260,7 +373,7 @@ $SKILL_DIR/scripts/calendar.sh todo complete --match "Test Todo"
 - [ ] `$SKILL_DIR/scripts/calendar.sh todo list --all` — appears as completed (with checkmark)
 - [ ] `vdirsyncer sync` ran
 
-## 12. Delete a Todo
+## 15. Delete a Todo
 
 Create a second test todo, then delete it.
 
@@ -283,7 +396,7 @@ $SKILL_DIR/scripts/calendar.sh todo delete --match "Delete Me"
 - [ ] `todo list` (todoman) does not show "Delete Me Todo"
 - [ ] `vdirsyncer sync` ran
 
-## 13. Todo Check (Cron Output)
+## 16. Todo Check (Cron Output)
 
 ```bash
 # Create a test todo
@@ -305,7 +418,7 @@ $SKILL_DIR/scripts/calendar.sh todo check
 # Should produce no output
 ```
 
-## 14. Dry Run: Recurring Event (--rrule)
+## 17. Dry Run: Recurring Event (--rrule)
 
 Test recurring event generation. Use a date that falls on a Tuesday.
 
@@ -314,7 +427,7 @@ Test recurring event generation. Use a date that falls on a Tuesday.
 NEXT_TUE=$(python3 -c "from datetime import date,timedelta; d=date.today(); d+=timedelta((1-d.weekday())%7 or 7); print(d)")
 
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Recurring Test (Tue)" \
   --summary "Recurring Test (Tue)" \
   --start "${NEXT_TUE}T14:30:00" \
@@ -328,14 +441,14 @@ $SKILL_DIR/scripts/calendar.sh send \
 - [ ] DTSTART falls on a Tuesday
 - [ ] No validation errors
 
-## 15. Validation: DTSTART/BYDAY Mismatch
+## 18. Validation: DTSTART/BYDAY Mismatch
 
 Verify the tool rejects mismatched DTSTART and BYDAY.
 
 ```bash
 # This should FAIL — start is on a Tuesday but BYDAY=TH
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Mismatch Test" \
   --summary "Mismatch Test" \
   --start "${NEXT_TUE}T09:00:00" \
@@ -349,7 +462,7 @@ $SKILL_DIR/scripts/calendar.sh send \
 - [ ] Error message says DTSTART falls on TU but RRULE says BYDAY=TH
 - [ ] Suggests changing --start to a date that falls on TH
 
-## 16. Event List
+## 19. Event List
 
 ```bash
 # List upcoming events
@@ -367,12 +480,12 @@ $SKILL_DIR/scripts/calendar.sh event list --format "{uid} {title}"
 - [ ] Search narrows results correctly
 - [ ] UIDs are displayed with --format
 
-## 17. Event Delete
+## 20. Event Delete
 
 ```bash
 # Send a throwaway event first
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "Delete Me Event" \
   --summary "Delete Me Event" \
   --start "${TEST_DATE}T20:00:00" \
@@ -394,7 +507,7 @@ $SKILL_DIR/scripts/calendar.sh event list --search "Delete Me"
 - [ ] Other events are untouched
 - [ ] `vdirsyncer sync` ran after delete
 
-## 18. Event Delete: Cancel Single Occurrence (EXDATE)
+## 21. Event Delete: Cancel Single Occurrence (EXDATE)
 
 Test that `--date` cancels one occurrence of a recurring event without deleting the series.
 
@@ -403,7 +516,7 @@ Test that `--date` cancels one occurrence of a recurring event without deleting
 NEXT_SAT=$(python3 -c "from datetime import date,timedelta; d=date.today(); d+=timedelta((5-d.weekday())%7 or 7); print(d)")
 
 $SKILL_DIR/scripts/calendar.sh send \
-  --to "mail@luyx.org" \
+  --to "测试用户" \
   --subject "EXDATE Test (Sat)" \
   --summary "EXDATE Test (Sat)" \
   --start "${NEXT_SAT}T10:00:00" \
@@ -425,7 +538,7 @@ ls ~/.openclaw/workspace/calendars/home/ | grep -i exdate
 - [ ] `.ics` file still exists in calendar dir
 - [ ] `khal list` no longer shows the cancelled date but shows subsequent Saturdays
 
-## 19. Event Delete: Recurring Without --date or --all (Safety Guard)
+## 22. Event Delete: Recurring Without --date or --all (Safety Guard)
 
 ```bash
 # Try to delete the recurring event without --date or --all — should FAIL
@@ -436,7 +549,7 @@ $SKILL_DIR/scripts/calendar.sh event delete --match "EXDATE Test"
 - [ ] Script exits with error
 - [ ] Error message explains the two options: `--date` or `--all`
 
-## 20. Event Delete: Recurring With --all
+## 23. Event Delete: Recurring With --all
 
 ```bash
 # Delete the entire series
@@ -447,11 +560,12 @@ $SKILL_DIR/scripts/calendar.sh event delete --match "EXDATE Test" --all
 - [ ] .ics file is removed
 - [ ] `event list --search "EXDATE Test"` shows nothing
 
-## 21. Regression: Existing Invite Commands (was #18)
+## 24. Regression: Send Rejects Unknown Addresses
 
-Verify new features didn't break VEVENT flow.
+Verify that `send` no longer accepts arbitrary email addresses.
 
 ```bash
+# This MUST fail — raw unknown email should be rejected
 $SKILL_DIR/scripts/calendar.sh send \
   --to "test@example.com" \
   --subject "Regression Test" \
@@ -462,9 +576,9 @@ $SKILL_DIR/scripts/calendar.sh send \
 ```
 
 **Verify:**
-- [ ] ICS has `BEGIN:VEVENT`, `METHOD:REQUEST`
-- [ ] No RRULE present (single event)
-- [ ] No errors
+- [ ] Command exits with error
+- [ ] Error shows "not found in contacts" with available contacts list
+- [ ] No ICS generated
 
 ---
 
@@ -507,3 +621,6 @@ todo list
 | SMTP rate limit / EOF error | Too many sends too fast. Wait 10+ seconds between sends (Migadu limit) |
 | Events disappeared after cleanup | **Never use `rm *.ics`** on calendar dirs. Use `event delete --match` instead |
 | Recurring series deleted when cancelling one date | Use `--date YYYY-MM-DD` to add EXDATE, not bare `event delete` (which requires `--all` for recurring) |
+| `send` rejects email address | Address not in contacts. Add with `contact add` first (separate from send) |
+| `send` says "has multiple emails" | Contact has work+home emails. Use `name:type` syntax (e.g. `小橘子:work`) |
+| Contacts dir empty after sync | Check vdirsyncer CardDAV pair is configured for `contacts/default/` |
diff --git a/skills/calendar/scripts/cal_tool.py b/skills/calendar/scripts/cal_tool.py
index 6826e6b..d362d25 100644
--- a/skills/calendar/scripts/cal_tool.py
+++ b/skills/calendar/scripts/cal_tool.py
@@ -6,16 +6,19 @@ Uses the icalendar library for proper RFC 5545 ICS generation and parsing.
 Uses himalaya CLI for email delivery. Syncs to local CalDAV via vdirsyncer.
 
 Subcommands:
-    python calendar.py send [options]          # create and send an invite (supports --rrule)
-    python calendar.py reply [options]         # accept/decline/tentative
-    python calendar.py event list [options]    # list/search calendar events
-    python calendar.py event delete [options]  # delete an event by UID or summary
-    python calendar.py todo add [options]      # create a VTODO task
-    python calendar.py todo list [options]     # list pending tasks
-    python calendar.py todo edit [options]     # edit a task's fields
-    python calendar.py todo complete [options] # mark task as done
-    python calendar.py todo delete [options]   # remove a task
-    python calendar.py todo check              # daily digest for cron
+    python calendar.py send [options]            # create and send an invite (supports --rrule)
+    python calendar.py reply [options]           # accept/decline/tentative
+    python calendar.py event list [options]      # list/search calendar events
+    python calendar.py event delete [options]    # delete an event by UID or summary
+    python calendar.py contact list              # list all contacts
+    python calendar.py contact add [options]     # add a contact
+    python calendar.py contact delete [options]  # delete a contact
+    python calendar.py todo add [options]        # create a VTODO task
+    python calendar.py todo list [options]       # list pending tasks
+    python calendar.py todo edit [options]       # edit a task's fields
+    python calendar.py todo complete [options]   # mark task as done
+    python calendar.py todo delete [options]     # remove a task
+    python calendar.py todo check                # daily digest for cron
 """
 
 import argparse
@@ -39,6 +42,7 @@ from icalendar import Alarm, Calendar, Event, Todo, vCalAddress, vRecur, vText
 DEFAULT_TIMEZONE = "America/Los_Angeles"
 DEFAULT_FROM = "youlu@luyanxin.com"
 CALENDAR_DIR = Path.home() / ".openclaw" / "workspace" / "calendars" / "home"
+CONTACTS_DIR = Path.home() / ".openclaw" / "workspace" / "contacts" / "default"
 TASKS_DIR = Path.home() / ".openclaw" / "workspace" / "calendars" / "tasks"
 PRODID = "-//OpenClaw//Calendar//EN"
 
@@ -161,6 +165,247 @@ def _validate_rrule_dtstart(rrule_dict, dtstart):
         sys.exit(1)
 
 
+# ---------------------------------------------------------------------------
+# Contacts (vCard / CardDAV)
+# ---------------------------------------------------------------------------
+
+
+def _parse_vcf(path):
+    """Parse a .vcf file into a dict with fn, nickname, emails, uid."""
+    text = path.read_text(encoding="utf-8", errors="replace")
+    result = {"fn": "", "nickname": "", "emails": [], "uid": "", "path": path}
+    for line in text.splitlines():
+        line_upper = line.upper()
+        if line_upper.startswith("FN:"):
+            result["fn"] = line.split(":", 1)[1].strip()
+        elif line_upper.startswith("NICKNAME:"):
+            result["nickname"] = line.split(":", 1)[1].strip()
+        elif line_upper.startswith("UID:"):
+            result["uid"] = line.split(":", 1)[1].strip()
+        elif "EMAIL" in line_upper and ":" in line:
+            # Handle EMAIL;TYPE=WORK:addr and EMAIL:addr
+            parts = line.split(":", 1)
+            email_addr = parts[1].strip()
+            email_type = ""
+            param_part = parts[0].upper()
+            if "TYPE=" in param_part:
+                for param in param_part.split(";"):
+                    if param.startswith("TYPE="):
+                        email_type = param.split("=", 1)[1].lower()
+            result["emails"].append({"address": email_addr, "type": email_type})
+    return result
+
+
+def _load_contacts():
+    """Load all contacts from CONTACTS_DIR. Returns list of parsed contact dicts."""
+    if not CONTACTS_DIR.is_dir():
+        return []
+    contacts = []
+    for vcf_path in sorted(CONTACTS_DIR.glob("*.vcf")):
+        try:
+            contact = _parse_vcf(vcf_path)
+            if contact["fn"] or contact["emails"]:
+                contacts.append(contact)
+        except Exception:
+            continue
+    return contacts
+
+
+def _resolve_recipient(to_str):
+    """Resolve a --to value to an email address via contacts lookup.
+
+    Supported formats:
+      --to "小橘子"           → match by FN or NICKNAME, use sole email or error if multiple
+      --to "小橘子:work"      → match by name, select email by TYPE
+      --to "user@example.com" → match by email address in contacts
+
+    Returns the resolved email address string, or exits with error + available contacts.
+    """
+    contacts = _load_contacts()
+
+    # Format: "name:type"
+    if ":" in to_str and "@" not in to_str:
+        name_part, type_part = to_str.rsplit(":", 1)
+        type_part = type_part.lower()
+    else:
+        name_part = to_str
+        type_part = ""
+
+    # If it looks like a raw email, search contacts for it
+    if "@" in name_part:
+        for c in contacts:
+            for e in c["emails"]:
+                if e["address"].lower() == name_part.lower():
+                    return e["address"]
+        _print_contact_error(f"Email '{name_part}' not found in contacts.", contacts)
+        sys.exit(1)
+
+    # Search by FN or NICKNAME (case-insensitive)
+    matches = []
+    for c in contacts:
+        if (c["fn"].lower() == name_part.lower() or
+                c["nickname"].lower() == name_part.lower()):
+            matches.append(c)
+
+    if not matches:
+        _print_contact_error(f"Contact '{name_part}' not found.", contacts)
+        sys.exit(1)
+    if len(matches) > 1:
+        _print_contact_error(f"Multiple contacts match '{name_part}'.", contacts)
+        sys.exit(1)
+
+    contact = matches[0]
+    emails = contact["emails"]
+
+    if not emails:
+        print(f"Error: Contact '{contact['fn']}' has no email addresses.", file=sys.stderr)
+        sys.exit(1)
+
+    # If type specified, filter by type
+    if type_part:
+        typed = [e for e in emails if e["type"] == type_part]
+        if not typed:
+            avail = ", ".join(f"{e['type'] or 'default'}={e['address']}" for e in emails)
+            print(f"Error: No '{type_part}' email for '{contact['fn']}'. Available: {avail}", file=sys.stderr)
+            sys.exit(1)
+        return typed[0]["address"]
+
+    # No type specified
+    if len(emails) == 1:
+        return emails[0]["address"]
+
+    # Multiple emails, require type qualifier
+    avail = ", ".join(f"{e['type'] or 'default'}={e['address']}" for e in emails)
+    print(
+        f"Error: '{contact['fn']}' has multiple emails. Specify type with '{name_part}:<type>'.\n"
+        f"  Available: {avail}",
+        file=sys.stderr,
+    )
+    sys.exit(1)
+
+
+def _print_contact_error(message, contacts):
+    """Print error with available contacts list."""
+    print(f"Error: {message}", file=sys.stderr)
+    if contacts:
+        print("Available contacts:", file=sys.stderr)
+        for c in contacts:
+            name = c["fn"]
+            nick = f" ({c['nickname']})" if c["nickname"] and c["nickname"] != c["fn"] else ""
+            for e in c["emails"]:
+                label = f" [{e['type']}]" if e["type"] else ""
+                print(f"  {name}{nick}{label} <{e['address']}>", file=sys.stderr)
+    else:
+        print("No contacts found. Add contacts with: calendar.sh contact add", file=sys.stderr)
+
+
+def _build_vcf(fn, emails, nickname="", uid=""):
+    """Build a vCard 3.0 string."""
+    uid = uid or f"{uuid.uuid4()}@openclaw"
+    lines = [
+        "BEGIN:VCARD",
+        "VERSION:3.0",
+        f"PRODID:{PRODID}",
+        f"UID:{uid}",
+        f"FN:{fn}",
+    ]
+    if nickname:
+        lines.append(f"NICKNAME:{nickname}")
+    for e in emails:
+        if e.get("type"):
+            lines.append(f"EMAIL;TYPE={e['type'].upper()}:{e['address']}")
+        else:
+            lines.append(f"EMAIL:{e['address']}")
+    lines.append("END:VCARD")
+    return "\n".join(lines) + "\n"
+
+
+# ---------------------------------------------------------------------------
+# Contact subcommands
+# ---------------------------------------------------------------------------
+
+
+def cmd_contact_list(args):
+    """List all contacts."""
+    contacts = _load_contacts()
+    if not contacts:
+        print("No contacts found. Add contacts with: calendar.sh contact add")
+        return
+    for c in contacts:
+        name = c["fn"]
+        nick = f" ({c['nickname']})" if c["nickname"] and c["nickname"] != c["fn"] else ""
+        for e in c["emails"]:
+            label = f" [{e['type']}]" if e["type"] else ""
+            print(f"  {name}{nick}{label} <{e['address']}>")
+
+
+def cmd_contact_add(args):
+    """Add a new contact (creates or updates a .vcf file)."""
+    CONTACTS_DIR.mkdir(parents=True, exist_ok=True)
+
+    emails = [{"address": args.email, "type": args.type or ""}]
+    nickname = args.nickname or ""
+
+    # Check if contact with same name already exists (update it)
+    existing = _load_contacts()
+    for c in existing:
+        if c["fn"].lower() == args.name.lower():
+            # Add email to existing contact if not duplicate
+            existing_addrs = {e["address"].lower() for e in c["emails"]}
+            if args.email.lower() in existing_addrs:
+                print(f"Contact '{args.name}' already has email {args.email}")
+                return
+            # Re-read and update
+            emails = c["emails"] + emails
+            nickname = nickname or c["nickname"]
+            vcf_str = _build_vcf(args.name, emails, nickname, c["uid"])
+            c["path"].write_text(vcf_str, encoding="utf-8")
+            print(f"Updated contact: {args.name} — added {args.email}")
+            _sync_calendar()
+            return
+
+    # New contact
+    uid = f"{uuid.uuid4()}@openclaw"
+    vcf_str = _build_vcf(args.name, emails, nickname, uid)
+    dest = CONTACTS_DIR / f"{uid}.vcf"
+    dest.write_text(vcf_str, encoding="utf-8")
+    print(f"Added contact: {args.name} <{args.email}>")
+    _sync_calendar()
+
+
+def cmd_contact_delete(args):
+    """Delete a contact."""
+    contacts = _load_contacts()
+    if not contacts:
+        print("No contacts found.", file=sys.stderr)
+        sys.exit(1)
+
+    matches = []
+    for c in contacts:
+        if args.name:
+            if (c["fn"].lower() == args.name.lower() or
+                    c["nickname"].lower() == args.name.lower()):
+                matches.append(c)
+        elif args.uid:
+            if args.uid in c["uid"]:
+                matches.append(c)
+
+    if not matches:
+        target = args.name or args.uid
+        _print_contact_error(f"No contact matching '{target}'.", contacts)
+        sys.exit(1)
+    if len(matches) > 1:
+        print(f"Error: Multiple contacts match:", file=sys.stderr)
+        for c in matches:
+            print(f"  {c['fn']} (uid: {c['uid']})", file=sys.stderr)
+        sys.exit(1)
+
+    contact = matches[0]
+    contact["path"].unlink()
+    print(f"Deleted contact: {contact['fn']}")
+    _sync_calendar()
+
+
 # ---------------------------------------------------------------------------
 # Send invite
 # ---------------------------------------------------------------------------
@@ -196,7 +441,7 @@ def cmd_send(args):
     if args.description:
         event.add("description", args.description)
 
-    recipients = [addr.strip() for addr in args.to.split(",")]
+    recipients = [_resolve_recipient(addr.strip()) for addr in args.to.split(",")]
 
     for addr in recipients:
         event.add("attendee", f"mailto:{addr}", parameters={
@@ -902,6 +1147,25 @@ def main():
     edel_p.add_argument("--date", default="", help="Cancel single occurrence on this date (YYYY-MM-DD, for recurring events)")
     edel_p.add_argument("--all", action="store_true", help="Delete entire recurring series (safety flag)")
 
+    # --- contact ---
+    contact_p = subparsers.add_parser("contact", help="Manage contacts")
+    contact_sub = contact_p.add_subparsers(dest="contact_command", required=True)
+
+    # contact list
+    contact_sub.add_parser("list", help="List all contacts")
+
+    # contact add
+    cadd_p = contact_sub.add_parser("add", help="Add a contact")
+    cadd_p.add_argument("--name", required=True, help="Display name (e.g. 小橘子)")
+    cadd_p.add_argument("--email", required=True, help="Email address")
+    cadd_p.add_argument("--nickname", default="", help="Nickname for lookup")
+    cadd_p.add_argument("--type", default="", help="Email type (work, home)")
+
+    # contact delete
+    cdel_p = contact_sub.add_parser("delete", help="Delete a contact")
+    cdel_p.add_argument("--name", default="", help="Contact name or nickname")
+    cdel_p.add_argument("--uid", default="", help="Contact UID")
+
     # --- todo ---
     todo_p = subparsers.add_parser("todo", help="Manage VTODO tasks")
     todo_sub = todo_p.add_subparsers(dest="todo_command", required=True)
@@ -950,6 +1214,13 @@ def main():
             cmd_event_list(args)
         elif args.event_command == "delete":
             cmd_event_delete(args)
+    elif args.command == "contact":
+        if args.contact_command == "list":
+            cmd_contact_list(args)
+        elif args.contact_command == "add":
+            cmd_contact_add(args)
+        elif args.contact_command == "delete":
+            cmd_contact_delete(args)
     elif args.command == "todo":
         if args.todo_command == "add":
             cmd_todo_add(args)
diff --git a/skills/calendar/scripts/calendar.sh b/skills/calendar/scripts/calendar.sh
index 88ff26a..1c216d5 100755
--- a/skills/calendar/scripts/calendar.sh
+++ b/skills/calendar/scripts/calendar.sh
@@ -4,9 +4,12 @@
 # Usage:
 #   ./calendar.sh send [options]          # send a calendar invite (supports --rrule)
 #   ./calendar.sh reply [options]         # accept/decline/tentative
-#   ./calendar.sh event list [options]    # list/search calendar events
-#   ./calendar.sh event delete [options]  # delete an event by UID or summary
-#   ./calendar.sh todo add [options]      # create a todo
+#   ./calendar.sh event list [options]      # list/search calendar events
+#   ./calendar.sh event delete [options]    # delete an event by UID or summary
+#   ./calendar.sh contact list              # list all contacts
+#   ./calendar.sh contact add [options]     # add a contact
+#   ./calendar.sh contact delete [options]  # delete a contact
+#   ./calendar.sh todo add [options]        # create a todo
 #   ./calendar.sh todo list [options]     # list pending todos
 #   ./calendar.sh todo edit [options]     # edit a todo's fields
 #   ./calendar.sh todo complete [options] # mark todo as done