[mcp / Windows] npx MCP server fails to initialize (fileno)

## Observed symptom MCP npx server fails to initialize on Windows (fileno) # [Bug] MCP npx server fails to initialize on Windows (fileno) ## Metadata | Field | Value | |-------|-------| | Repository | MervinPraison/PraisonAI | | Release tested | v4.7.11 | | Commit (tag) | `08079647275c500f27e02ce7fa229f15b0308f8f` | | Labels | bug, praisonai-agents, mcp, windows, e2e, v4.7.11 | | Priority | P2 | ## Executive summary `MCP('npx -y @modelcontextprotocol/server-time')` raises **RuntimeError: fileno** on Windows during `__init__` (v4.7.11). Blocks MCP tool usage for Windows developers. ## Interactive triage ```mermaid flowchart TD A[Platform Wi ## Literal error text ``` npx MCP server fails to initialize (fileno) ``` ## Version info v4.7.11 ## Environment Windows; npx MCP server ## Trigger / context # [Bug] MCP npx server fails to initialize on Windows (fileno) ## Metadata | Field | Value | |-------|-------| | Repository | MervinPraison/PraisonAI | | Release tested | v4.7.11 | | Commit (tag) | `08079647275c500f27e02ce7fa229f15b0308f8f` | | Labels | bug, praisonai-agents, mcp, windows, e2e, v4.7.11 | | Priority | P2 | ## Executive summary `MCP('npx -y @modelcontextprotocol/server-time')` raises **RuntimeError: fileno** on Windows during `__init__` (v4.7.11). Blocks MCP tool usage for Windows developers. ## Interactive triage ```mermaid flowchart TD A[Platform Windows?] -->|No| B[Re-test Linux] A -->|Yes| C[MCP npx server-time] C --> D{Init OK?} D -->|fileno error| E[MCP Windows init failure] D -->|OK| Z ``` --- ## Terminal evidence ```t ## Source evidence - https://github.com/MervinPraison/PraisonAI/issues/5598 (2026-10-02T08:34:10Z) — GitHub issue #5598 (OPEN) ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T09:33:42Z - scout_id: Cf319b794b6 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome.