feat(codex): support slash controls and skill discovery (#545)

* feat(codex): resolve slash controls before sending to Codex

* feat(codex): discover commands and skills

* fix(codex): handle slash commands before attachments

* fix(codex): block remaining unsupported built-ins

web/src/components/AssistantChat/HappyComposer.tsx

@@ -199,20 +199,12 @@ export function HappyComposer(props: {
             markSkillUsed(suggestion.text.slice(1))
         }
 
-        // For Codex user prompts with content, expand the content instead of command name
-        let textToInsert = suggestion.text
-        let addSpace = true
-        if (agentFlavor === 'codex' && suggestion.source !== 'builtin' && suggestion.content) {
-            textToInsert = suggestion.content
-            addSpace = false
-        }
-
         const result = applySuggestion(
             inputState.text,
             inputState.selection,
-            textToInsert,
+            suggestion.text,
             autocompletePrefixes,
-            addSpace
+            true
         )
 
         api.composer().setText(result.text)
@@ -233,7 +225,7 @@ export function HappyComposer(props: {
         }, 0)
 
         haptic('light')
-    }, [api, suggestions, inputState, autocompletePrefixes, haptic, agentFlavor])
+    }, [api, suggestions, inputState, autocompletePrefixes, haptic])
 
     const abortDisabled = controlsDisabled || isAborting || !threadIsRunning
     const switchDisabled = controlsDisabled || isSwitching || !controlledByUser

web/src/components/SessionChat.tsx

@@ -20,8 +20,6 @@ import { HappyComposer } from '@/components/AssistantChat/HappyComposer'
 import { HappyThread } from '@/components/AssistantChat/HappyThread'
 import { useHappyRuntime } from '@/lib/assistant-runtime'
 import { createAttachmentAdapter } from '@/lib/attachmentAdapter'
-import { findUnsupportedCodexBuiltinSlashCommand } from '@/lib/codexSlashCommands'
-import { useToast } from '@/lib/toast-context'
 import { useTranslation } from '@/lib/use-translation'
 import { SessionHeader } from '@/components/SessionHeader'
 import { TeamPanel } from '@/components/TeamPanel'
@@ -67,7 +65,6 @@ export function SessionChat(props: {
     availableSlashCommands?: readonly SlashCommand[]
 }) {
     const { haptic } = usePlatform()
-    const { addToast } = useToast()
     const { t } = useTranslation()
     const navigate = useNavigate()
     const sessionInactive = !props.session.active
@@ -349,26 +346,9 @@ export function SessionChat(props: {
     }, [navigate, props.session.id])
 
     const handleSend = useCallback((text: string, attachments?: AttachmentMetadata[]) => {
-        if (agentFlavor === 'codex') {
-            const unsupportedCommand = findUnsupportedCodexBuiltinSlashCommand(
-                text,
-                props.availableSlashCommands ?? []
-            )
-            if (unsupportedCommand) {
-                haptic.notification('error')
-                addToast({
-                    title: t('composer.codexSlashUnsupported.title'),
-                    body: t('composer.codexSlashUnsupported.body', { command: `/${unsupportedCommand}` }),
-                    sessionId: props.session.id,
-                    url: `/sessions/${props.session.id}`
-                })
-                return
-            }
-        }
-
         props.onSend(text, attachments)
         setForceScrollToken((token) => token + 1)
-    }, [agentFlavor, props.availableSlashCommands, props.onSend, props.session.id, addToast, haptic, t])
+    }, [props.onSend])
 
     const attachmentAdapter = useMemo(() => {
         if (!props.session.active) {