Codex CLI: MCP Tool Search by Default & System Proxy Support
CodexCodex CLI 0.142.2 makes MCP tool search the default behavior for supported providers, so the agent now automatically discovers and selects the most relevant tool from connected MCP servers without manual configuration. The release also adds macOS system proxy support (PAC, WPAD, and static proxy settings via respect_system_proxy), completing cross-platform coverage alongside the Windows proxy support added in the same-day 0.142.1 patch. Additional bug fixes address expired Amazon Bedrock credential errors, remote HTTP image validation, and a PowerShell safety gap.
Sources & Mentions
3 external resources covering this update
MCP Tool Search Becomes the Default
Codex CLI 0.142.2 makes MCP tool search the default behavior for supported providers. Instead of requiring manual configuration of which tools to expose, the agent now automatically discovers and selects the most relevant tool from connected MCP servers. Older MCP providers that do not support tool search fall back automatically, preserving backward compatibility.
Cross-Platform System Proxy Support
The release adds macOS system proxy support, honoring PAC, WPAD, and static proxy settings through the respect_system_proxy option. Combined with the Windows proxy support added in the same-day 0.142.1 patch, Codex CLI now offers cross-platform system proxy coverage, making it usable behind corporate proxy configurations on both major desktop platforms.
Bug Fixes
Several fixes ship alongside the headline features. Expired Amazon Bedrock credentials now surface actionable error messages instead of opaque failures. Remote HTTP image validation was tightened. A PowerShell safety gap was closed: uninspectable AST regions now require explicit user approval before execution. Dark-mode plugin logos are also now supported for consistent branding across themes.