feat(settings): add Enable Fast toggle for Codex service tier

src/components/settings/acp-agent-settings.tsx

@@ -121,6 +121,7 @@ interface AgentDraft {
   codexReasoningEffort: CodexReasoningEffort
   codexSupportsWebsockets: boolean
   codexSkills: boolean
+  codexServiceTierFast: boolean
   claudeMainModel: string
   claudeReasoningModel: string
   claudeDefaultHaikuModel: string
@@ -1147,6 +1148,7 @@ interface CodexTomlImportantValues {
   providerSupportsWebsockets: Record<string, boolean>
   featureResponsesWebsocketsV2: boolean
   featureSkills: boolean
+  serviceTierFast: boolean
 }
 
 interface CodexImportantValues {
@@ -1158,6 +1160,7 @@ interface CodexImportantValues {
   providerOptions: string[]
   supportsWebsockets: boolean
   skills: boolean
+  serviceTierFast: boolean
 }
 
 const CODEX_DEFAULT_MODEL_PROVIDER = "codeg"
@@ -1319,6 +1322,7 @@ function extractCodexTomlImportantValues(
     CODEX_DEFAULT_REASONING_EFFORT
   let featureResponsesWebsocketsV2 = false
   let featureSkills = false
+  let serviceTierFast = false
   let currentProviderSection: string | null = null
   let inFeaturesSection = false
 
@@ -1364,6 +1368,14 @@ function extractCodexTomlImportantValues(
           CODEX_DEFAULT_REASONING_EFFORT
         continue
       }
+      if (
+        !currentProviderSection &&
+        !inFeaturesSection &&
+        assignment.key === "service_tier"
+      ) {
+        serviceTierFast = assignment.value.toLowerCase() === "fast"
+        continue
+      }
     }
 
     const boolAssignment = parseTomlBooleanAssignment(rawLine)
@@ -1452,6 +1464,7 @@ function extractCodexTomlImportantValues(
     providerSupportsWebsockets,
     featureResponsesWebsocketsV2,
     featureSkills,
+    serviceTierFast,
   }
 }
 
@@ -1547,6 +1560,7 @@ function extractCodexImportantValues(
     ),
     supportsWebsockets: providerSupportsWebsockets,
     skills: toml.featureSkills,
+    serviceTierFast: toml.serviceTierFast,
   }
 }
 
@@ -1579,7 +1593,11 @@ function preferredTomlRootInsertionIndex(lines: string[], key: string): number {
     const modelIndex = findTomlRootAssignmentIndex(lines, "model")
     return modelIndex >= 0 ? modelIndex + 1 : 0
   }
-  return findTomlRootEndIndex(lines)
+  let insertAt = findTomlRootEndIndex(lines)
+  while (insertAt > 0 && lines[insertAt - 1].trim() === "") {
+    insertAt -= 1
+  }
+  return insertAt
 }
 
 function updateTomlRootStringKey(
@@ -1952,6 +1970,7 @@ function patchCodexConfigTomlText(
     modelReasoningEffort?: string
     supportsWebsockets?: boolean
     skills?: boolean
+    serviceTierFast?: boolean
   }
 ): string {
   let nextTomlText = configTomlText
@@ -2052,6 +2071,13 @@ function patchCodexConfigTomlText(
       patch.skills ? true : null
     )
   }
+  if (typeof patch.serviceTierFast === "boolean") {
+    nextTomlText = updateTomlRootStringKey(
+      nextTomlText,
+      "service_tier",
+      patch.serviceTierFast ? "fast" : ""
+    )
+  }
   nextTomlText = updateTomlRootBooleanKey(
     nextTomlText,
     "disable_response_storage",
@@ -2286,6 +2312,7 @@ function buildAgentDraft(agent: AcpAgentInfo): AgentDraft {
     codexReasoningEffort: codexImportant.reasoningEffort,
     codexSupportsWebsockets: codexImportant.supportsWebsockets,
     codexSkills: codexImportant.skills,
+    codexServiceTierFast: codexImportant.serviceTierFast,
     claudeMainModel: important.claudeMainModel,
     claudeReasoningModel: important.claudeReasoningModel,
     claudeDefaultHaikuModel: important.claudeDefaultHaikuModel,
@@ -4519,6 +4546,7 @@ export function AcpAgentSettings() {
         codexReasoningEffort: important.reasoningEffort,
         codexSupportsWebsockets: important.supportsWebsockets,
         codexSkills: important.skills,
+        codexServiceTierFast: important.serviceTierFast,
       }))
     },
     [selectedAgent, selectedDraft, updateSelectedDraft]
@@ -4542,6 +4570,7 @@ export function AcpAgentSettings() {
         codexReasoningEffort: important.reasoningEffort,
         codexSupportsWebsockets: important.supportsWebsockets,
         codexSkills: important.skills,
+        codexServiceTierFast: important.serviceTierFast,
       }))
     },
     [selectedAgent, selectedDraft, updateSelectedDraft]
@@ -4594,6 +4623,7 @@ export function AcpAgentSettings() {
           codexReasoningEffort: synced.reasoningEffort,
           codexSupportsWebsockets: synced.supportsWebsockets,
           codexSkills: synced.skills,
+          codexServiceTierFast: synced.serviceTierFast,
         }))
         return
       }
@@ -4627,6 +4657,7 @@ export function AcpAgentSettings() {
         codexReasoningEffort: synced.reasoningEffort,
         codexSupportsWebsockets: synced.supportsWebsockets,
         codexSkills: synced.skills,
+        codexServiceTierFast: synced.serviceTierFast,
       }))
     },
     [selectedAgent, selectedDraft, updateSelectedDraft]
@@ -4693,6 +4724,7 @@ export function AcpAgentSettings() {
         codexReasoningEffort: synced.reasoningEffort,
         codexSupportsWebsockets: synced.supportsWebsockets,
         codexSkills: synced.skills,
+        codexServiceTierFast: synced.serviceTierFast,
         codexAuthJsonText: nextAuth.authJsonText,
         codexConfigTomlText: nextToml,
       }))
@@ -4729,6 +4761,7 @@ export function AcpAgentSettings() {
         codexReasoningEffort: synced.reasoningEffort,
         codexSupportsWebsockets: synced.supportsWebsockets,
         codexSkills: synced.skills,
+        codexServiceTierFast: synced.serviceTierFast,
         codexConfigTomlText: nextToml,
       }))
     },
@@ -4761,6 +4794,40 @@ export function AcpAgentSettings() {
         codexReasoningEffort: synced.reasoningEffort,
         codexSupportsWebsockets: synced.supportsWebsockets,
         codexSkills: synced.skills,
+        codexServiceTierFast: synced.serviceTierFast,
+        codexConfigTomlText: nextToml,
+      }))
+    },
+    [selectedAgent, selectedDraft, updateSelectedDraft]
+  )
+
+  const handleCodexServiceTierFastChange = useCallback(
+    (enabled: boolean) => {
+      if (
+        !selectedAgent ||
+        !selectedDraft ||
+        selectedAgent.agent_type !== "codex"
+      )
+        return
+      const nextToml = patchCodexConfigTomlText(
+        selectedDraft.codexConfigTomlText,
+        { serviceTierFast: enabled }
+      )
+      const synced = extractCodexImportantValues(
+        selectedDraft.codexAuthJsonText,
+        nextToml
+      )
+      updateSelectedDraft((current) => ({
+        ...current,
+        apiBaseUrl: synced.apiBaseUrl,
+        apiKey: synced.apiKey ?? current.apiKey,
+        model: synced.model,
+        codexModelProvider: synced.modelProvider,
+        codexProviderOptions: synced.providerOptions,
+        codexReasoningEffort: synced.reasoningEffort,
+        codexSupportsWebsockets: synced.supportsWebsockets,
+        codexSkills: synced.skills,
+        codexServiceTierFast: synced.serviceTierFast,
         codexConfigTomlText: nextToml,
       }))
     },
@@ -5351,6 +5418,19 @@ export function AcpAgentSettings() {
                       </div>
                     </div>
 
+                    <div className="space-y-1.5">
+                      <div className="flex items-center justify-between rounded-md border px-3 py-2">
+                        <label className="text-[11px] text-muted-foreground">
+                          {t("codex.enableFast")}
+                        </label>
+                        <Switch
+                          checked={selectedDraft.codexServiceTierFast}
+                          onCheckedChange={handleCodexServiceTierFastChange}
+                          aria-label={t("codex.enableFastAria")}
+                        />
+                      </div>
+                    </div>
+
                     <div className="space-y-1.5">
                       <label className="text-[11px] text-muted-foreground">
                         {t("codex.authJsonNative")}