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## Why The model-visible `<network>` context currently repeats indentation and a pair of XML tags for every allowed or denied domain. Large domain sets spend a surprising amount of prompt budget on that scaffolding instead of the actual policy values. ## What changed - Render allowed domains as one comma-separated `<allowed>` value instead of one element per domain. - Render denied domains the same way. - Keep the full allow/deny domain sets model-visible while updating the serialization and settings-update coverage for the denser shape. ## Example Before: ```xml <network enabled="true"> <allowed>api.example.test</allowed> <allowed>cdn.example.test</allowed> <denied>blocked.example.test</denied> </network> ``` After: ```xml <network enabled="true"><allowed>api.example.test,cdn.example.test</allowed><denied>blocked.example.test</denied></network> ``` ## Validation - `cargo test -p codex-core environment_context` - `cargo test -p codex-core build_settings_update_items_emits_environment_item_for_network_changes` - Ran a local `codex` session with a real network context containing 121 allowed domains and 42 denied domains, then inspected the raw prompt with `raw_token_viewer_cli.py`. With the same domain set, the rendered `<network>` section shrank from 7,175 characters across 161 lines to 3,666 characters on one line, and the containing environment-context block fell from 6,428 tokens to 5,379 tokens.