# Notion: Major incident: Notion MCP query_data_source tool is temporarily unavailable in Claude clients

**Summary:** _summary pending_
- Kind: Major incident · Label: major (vendor)
- Changed: 2026-10-22 03:23 UTC · Detected: 2026-10-22 03:33 UTC
- [Source: https://www.notion-status.com/incidents/01M5GT4J4EF9Z9R6M4KD9AY21Q](https://www.notion-status.com/incidents/01M5GT4J4EF9Z9R6M4KD9AY21Q)
- [Company: Notion](https://rewindex.com/company/notion.md)
- Versions: before (none: first archived) → after incident\_version:110/01M5GT4J4EF9Z9R6M4KD9AY21Q@7825d0624058
- Change 1 of 2 for this incident

Incident page (full timeline): [Notion MCP query\_data\_source tool is temporarily unavailable in Claude clients](https://rewindex.com/company/notion/incidents/01M5GT4J4EF9Z9R6M4KD9AY21Q.md)
## What changed

**1. Added: Title**

```diff
+ Notion MCP query_data_source tool is temporarily unavailable in Claude clients
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ investigating
```

**4. Added: Start time**

```diff
+ 2026-10-22 03:23 UTC
```

**5. Added: Update** (investigating) · 2026-10-22 03:23 UTC

```diff
+ The Notion MCP query_data_source tool is temporarily unavailable in Claude clients.
```

**6. Added: Update** (investigating) · 2026-10-22 03:33 UTC

```diff
+ The Notion MCP query_data_source tool is temporarily unavailable in Claude clients.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-22 03:23 UTC | Major incident: Notion MCP query\_data\_source tool is temporarily unavailable in Claude clients (this change) | major |
| 2026-10-22 04:43 UTC | [Incident updated: Notion MCP query\_data\_source tool is temporarily unavailable in Claude clients](https://rewindex.com/change/r263f07854f7c70.md) |  |

Next: [change](https://rewindex.com/change/r263f07854f7c70.md) · All Notion changes: [timeline](https://rewindex.com/company/notion/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/id5d63648ee3df9 · Markdown: https://rewindex.com/change/id5d63648ee3df9.md · JSON: https://rewindex.com/api/v1/changes/id5d63648ee3df9 · Generated 2026-10-22T07:04:03.235Z