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Codex is building Guardian into a metered subsystem with its own crate, budget ceilings and cost telemetry
Ten PRs merged into openai/codex in the 24 hours to 2026-09-10 are one build-out: Guardian review policy was extracted into a dedicated crate (#44227), complete-request and aggregate budget enforcement landed (#44281, #44293, #44166), and cost plus request-token telemetry with explicit histogram buckets was added (#44164, #44181). PR #44493 moved MCP `tool_description` and `connector_description` into an optional, explicitly untrusted `guardian_tool_descriptions` fragment capped at 400 estimated tokens each, so connector metadata stops eating review input budget.
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