model_providers.<id>.env_key: env var for provider API key. model_providers.<id>

features.fast_mode: enables Fast mode selection; stable and on by default.

features.smart_approvals: experimental guardian-reviewer approval routing.

features.web_search: deprecated old toggle; prefer web_search.

features.web_search_cached: deprecated old toggle mapping to cached mode.

features.web_search_request: deprecated old toggle mapping to live mode.

experimental_use_unified_exec_tool: deprecated legacy alias for unified exec.

suppress_unstable_features_warning: hide warning when under-development features are enabled.

shell_environment_policy.inherit: baseline env inheritance, all | core | none.

shell_environment_policy.ignore_default_excludes: keep KEY/SECRET/TOKEN vars before filtering.

shell_environment_policy.exclude: env var exclude globs.

shell_environment_policy.include_only: env var allowlist globs.

shell_environment_policy.set: explicit env var overrides.

shell_environment_policy.experimental_use_profile: load shell profile when spawning subprocesses.

history.persistence: save-all | none transcript storage.

history.max_bytes: cap history file size.

tool_output_token_limit: cap stored tool-output tokens.

compact_prompt: inline history-compaction prompt override.