[BUG] Microsoft 365 MCP: outlook_email_search offset and beforeDateTime parameters are ignored — pagination broken

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Summary

The outlook_email_search tool's offset and beforeDateTime parameters are silently ignored. Every query returns the same set of most-recent results regardless of offset value, making it impossible to paginate through more than 50 emails. This effectively caps email retrieval at 50 messages per query with no workaround.

Reproduction

offset is ignored

# These three calls all return the EXACT same 50 messages (verified by message ID):
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=0)
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=50)
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=25)

The only difference is the offset number in each response object is renumbered (0-49, 50-99, 25-74) — the actual message data and IDs are identical.

beforeDateTime is ignored

# This should return only emails from Friday evening to Sunday midnight:
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", beforeDateTime="2026-03-15T06:00:00Z", folderName="Deleted Items", limit=50)

# Instead returns emails from Monday afternoon (2026-03-16T14:58Z) — well outside the window

Test Matrix

| Parameter | Works? | Notes |
|-----------|--------|-------|
| offset | No | Completely ignored; same results at any offset value |
| beforeDateTime | No | Completely ignored; results outside the window are returned |
| afterDateTime | Yes | Correctly filters to emails after the given time |
| limit | Yes | Correctly limits result count (e.g., limit=10 returns 10) |
| folderName | Yes | Correctly scopes to the specified folder |
| query | Yes | Correctly filters by keyword |
| sender | Yes | Correctly filters by sender |

Tested offset values

All tested against Deleted Items folder with afterDateTime set and limit=50:

• offset=0, 5, 10, 25, 50, 100, 150, 200 — all return the same 50 messages
• Tested with and without query parameter — same behavior
• Tested with limit=5 at offset=0 and offset=5 — same first 5 messages

Impact

• Cannot retrieve more than 50 emails from any single query
• Cannot paginate through large mailboxes (e.g., 11,000+ items in Deleted Items)
• Time-window slicing is impossible since beforeDateTime is also broken
• Skills/agents that rely on pagination (e.g., daily email catchup) silently miss the majority of messages

Workaround

Using read_resource with mail:///folders/{folderName} returns the 50 most-recent messages per folder plus subfolder structure, which allows drilling into subfolders for additional coverage. However, read_resource also has no pagination support (query string parameters like $skip/$top are ignored).

Expected Behavior

• offset=50 with limit=50 should skip the first 50 results and return results 51-100
• beforeDateTime should filter out emails received after the specified time
• These parameters should map to the underlying Microsoft Graph API's $skip and $filter (receivedDateTime lt ...) respectively

Environment

• Claude Code with Microsoft 365 MCP integration (Team/Enterprise plan)
• Tool: mcp__claude_ai_Microsoft_365__outlook_email_search
• Windows 11, Claude Code CLI

What Should Happen?

• offset=50 with limit=50 should skip the first 50 results and return results 51-100
• beforeDateTime should filter out emails received after the specified time
• These parameters should map to the underlying Microsoft Graph API's $skip and $filter (receivedDateTime lt ...) respectively

Error Messages/Logs

Steps to Reproduce

offset is ignored

# These three calls all return the EXACT same 50 messages (verified by message ID):
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=0)
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=50)
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", folderName="Deleted Items", limit=50, offset=25)

The only difference is the offset number in each response object is renumbered (0-49, 50-99, 25-74) — the actual message data and IDs are identical.

beforeDateTime is ignored

# This should return only emails from Friday evening to Sunday midnight:
outlook_email_search(afterDateTime="2026-03-13T23:00:00Z", beforeDateTime="2026-03-15T06:00:00Z", folderName="Deleted Items", limit=50)

# Instead returns emails from Monday afternoon (2026-03-16T14:58Z) — well outside the window

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.76

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_