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Document concurrent tool execution architecture #1040

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16 changes: 15 additions & 1 deletion docs/contributing/system-architecture.mdx
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Expand Up @@ -272,7 +272,8 @@ sequenceDiagram
│ ├── POST /:id/disconnect - Disconnect from server
│ ├── /tools
│ │ ├── GET / - List tools
│ │ └── POST /:name/call - Call tool
│ │ ├── POST /execute - Execute tool (concurrent)
│ │ └── POST /respond - Respond to elicitation
│ ├── /resources
│ │ ├── GET / - List resources
│ │ └── GET /:uri - Read resource
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</Tab>
</Tabs>

### Concurrent Tool Execution

The tools API supports concurrent execution of multiple tools simultaneously. Each tool execution is tracked by a unique `executionId`, allowing multiple tools to run in parallel without blocking each other.

**Architecture:**

- `activeExecutions` Map stores execution contexts keyed by `executionId`
- Each execution maintains its own queue for elicitation requests
- The `/respond` endpoint requires both `executionId` and `requestId` to route responses correctly
- Execution contexts are automatically cleaned up when complete

**Key Implementation:** `server/routes/mcp/tools.ts`

## Electron Integration

### Process Architecture
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