MCP servers start but tools never cached (has_cached_tools=false)

Environment

• Version: Codex Desktop 26.707.31428
• OS: Windows 10
• Setup: Custom model provider via wire_api="responses", requires_openai_auth=true

Issue

12 MCP servers start successfully (startup_complete=true, 94 tools total), but has_cached_tools is always false and model requests only include 15 built-in tools — never any MCP tools.

MCP servers configured (all start OK)

• filesystem (14 tools)
• git (12)
• fetch (1)
• playwright (24)
• flaui (11)
• serena (22)
• context7 (2)
• screenhand
• wxauto (5)
• windows-mcp
• codex-node-repl
• node_repl (3)

What I've tried

• Permission profile: Custom / Full Access — same result
• Removed [features] js_repl = false — same result
• New sessions after config changes — same result
• Tried switching wire_api to chat_completions but relay was unstable

Expected

MCP tools should be cached and included in model requests after startup_complete=true