The complete library
All Windows AI tool fixes
Each page targets one searchable error signature and tells you whether the workaround was confirmed, partial, or still unknown.
Fix “AbsolutePathBuf deserialized without a base path” in Codex on Windows
Invalid request: AbsolutePathBuf deserialized without a base pathTwo Windows reports point to workspace-mode and path-state failures. Switching out of WSL mode or reloading the VS Code window restored chat creation temporarily.
Codex fatal error: “HW capability found … but requested …” on Windows
Fatal Error: HW capability found: 0x178BFBFF 0x7EF8320B, but HW capability requested: 0x200000 0x00A Windows regression affected some Ryzen systems. Version 0.104 or WSL were the repeatedly reported escape hatches while newer native builds failed before startup.
Fix “Windows cannot find codex-windows-sandbox-setup.exe”
Windows cannot find 'codex-windows-sandbox-setup.exe'Standalone and extension installs can lose the sandbox helper path. Running Codex from the official release package’s bin folder completed setup in a clean Windows VM.
Fix Codex config.toml “missing escaped value” on Windows
missing escaped value, expected b, e, f, n, r, \, quote, x, u, UA double-quoted Windows path makes TOML interpret backslashes as escapes. Forward slashes or literal single-quoted TOML strings fixed the reported startup failure.
Codex WSL error: codex-linux-sandbox “doesn’t exist” (ENOENT)
Unable to spawn codex-linux-sandbox because it doesn't exist on the filesystem (ENOENT)A full Codex Desktop restart rebuilt the missing helper directory for one reporter. Native Windows mode or the Ubuntu CLI are safer fallbacks by repository location.
Fix “Unable to locate the Codex CLI binary” on Windows
Unable to locate the Codex CLI binary. Set CODEX_CLI_PATH or ensure the Electron resources include bin/codex.A move or reinstall to the C: drive restored Codex Desktop for the original reporter. Check the resolved install before creating a custom wrapper.
Fix Claude Code MCP “spawn npx ENOENT” on Windows
SPAWN ERROR: ENOENT spawn npx ENOENTOn native Windows, route NPX through cmd.exe. A reporter confirmed the change connected six official plugin MCPs, including Context7 and Playwright.
Claude Desktop MCP “UtilityProcess spawn timeout” on Windows
MCP X: UtilityProcess spawn timeout — Could not connect to MCP server XOne Windows 11 report found three or more stdio servers unreliable while two remained stable. There is no confirmed permanent fix in the cited reports.
Fix Playwright MCP reconnect failure and /c → C:/ rewrite on Windows
Failed to reconnect to plugin:playwright:playwrightA native Windows report found Claude serialized cmd.exe’s /c as C:/. Launching the Playwright MCP CLI directly with Node bypassed the broken command transformation.
Claude Desktop shows “No servers added” with a valid MCP config
No servers addedThe Microsoft Store/MSIX build could silently ignore the usual AppData config path. The original reporter restored MCP loading with Anthropic’s direct-download desktop build.
MCP filesystem rejects a valid Windows subfolder as “outside allowed directories”
Access denied - path outside allowed directories: c:\... not in C:\...Windows drive-letter casing can break a textual containment check. Matching both paths to an uppercase drive letter is a partial workaround, not a universal fix.